Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns Arcade1Up Try the site in https mode Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

  

Author Topic: My Stargate needs help... 1-2-1 ram error  (Read 25770 times)

0 Members and 1 Guest are viewing this topic.

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
My Stargate needs help... 1-2-1 ram error
« on: March 06, 2008, 12:56:26 pm »
I have a Stargate machine that has been giving me fits since I bought it a year ago. Although it was fine when I bought it, most of this past year it has not worked 100% for various reasons.

Right now, it's giving me a 1-2-1 error code when I turn it on. It shows the multi-color pixel screen which is normal, then it kind of hangs, sometimes staying on the same screen, sometimes going to a screen that looks like the game is running, but the video is all garbled. None of the buttons work, so it's pretty much dead at that point.

I understand the code 1-2-1 means, ram error, bank 2, chip 1.  I have pulled that chip out, replaced it with another from a different location, and same error. They only way I can get it to give me a different error is if I pull the chip from bank 3, chip 1, which I understand is the first chip tested, then I get 1-3-1.

I'm pretty much fed up with this, I didn't buy this thing to take up space in my rec room, I'm not playing it. I really don't want to sink more money into it, having it repaired by a onsite technician $$$$, so I'm thinking about just gutting it, selling off the boards and turning it into a multi-mame machine that plays Stargate and others.

I hate to destroy an original stargate arcade machine though.

I have a Ms Pacman that I restored using mame, but I bought that as a non-working empty cabinet, so I didn't feel so bad.

Any suggestions????

« Last Edit: March 17, 2008, 10:06:09 am by quanlee »

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #1 on: March 06, 2008, 01:04:38 pm »
Check your +5, -5, +12 supply voltages on the decoder pcb... many times power supply problems can cause ram errors...

Also... if your board is not conveted to 4164 RAMs... you should do that... its inexpensive and makes the system much more reliable.

 :cheers:

Last Edit: Changed -12 to +12...oops
« Last Edit: March 06, 2008, 01:07:49 pm by RetroACTIVE »
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #2 on: March 06, 2008, 01:13:08 pm »
I know nothing about electronics, can you explain in detail, what you mean by checking voltages? I understand the concept, but don't know which is the decoder pcb, or where to connect the voltage meter.

Where can I get 4164 rams?

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #3 on: March 06, 2008, 01:19:39 pm »
I know nothing about electronics, can you explain in detail, what you mean by checking voltages? I understand the concept, but don't know which is the decoder pcb, or where to connect the voltage meter.

Where can I get 4164 rams?

You will need a multimeter to check voltage...
The decoder PCB is the largest PCB of the 4... the power connector is towards the bottom left right below the reset button...

I may have a spare set of 4164's I could sell ya cheap... I'll have to check...

Here is an excellent site for Williams boards:

http://www.robotron-2084.co.uk/techwilliamshardwareid.html#stargate

Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #4 on: March 06, 2008, 02:18:13 pm »
Quote from: RetroACTIVE
You will need a multimeter to check voltage...
The decoder PCB is the largest PCB of the 4... the power connector is towards the bottom left right below the reset button...

I may have a spare set of 4164's I could sell ya cheap... I'll have to check...

Here is an excellent site for Williams boards:

http://www.robotron-2084.co.uk/techwilliamshardwareid.html#stargate

I've been to that site, that's where I learned where the ram chips are located. I've identified my cpu board as revision B version. When you say decoder board, you mean the cpu board where the ram resides, correct?

My cpu board is actually turned 90 degrees clockwise in my cabinet, so the reset button is on the top, but I understand where you are talking about.

Call me stupid, but with multi-meter in hand, where do I place the two sensors? I believe there are multiple wires in the power connector. Do I disconnect it and test one and or all of them?

Sorry, I'm electonically challanged.

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #5 on: March 06, 2008, 02:35:03 pm »
Yes the CPU is the decoder...

Download the stargate upright drawing set... it has all the schematics and interconnections... here is an excerpt from the drawing set...

put your multimeter on VDC and connect the black (common lead) to the GROUND as indicated in the pic... then connect your red lead to each of the other +5, +12 and -5 and record their readings...

oh.. and don't disconnect anything... put the probe right into the connector assembly where the wire goes in... you should be able to make contact with the metal contact in the housing... be careful not to short anything....
« Last Edit: March 06, 2008, 02:37:03 pm by RetroACTIVE »
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #6 on: March 06, 2008, 02:47:54 pm »
Yes the CPU is the decoder...

Download the stargate upright drawing set... it has all the schematics and interconnections... here is an excerpt from the drawing set...

put your multimeter on VDC and connect the black (common lead) to the GROUND as indicated in the pic... then connect your red lead to each of the other +5, +12 and -5 and record their readings...

oh.. and don't disconnect anything... put the probe right into the connector assembly where the wire goes in... you should be able to make contact with the metal contact in the housing... be careful not to short anything....

Awesome... thanks!

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #7 on: March 06, 2008, 03:11:28 pm »
Yes the CPU is the decoder...

Download the stargate upright drawing set... it has all the schematics and interconnections... here is an excerpt from the drawing set...

put your multimeter on VDC and connect the black (common lead) to the GROUND as indicated in the pic... then connect your red lead to each of the other +5, +12 and -5 and record their readings...

oh.. and don't disconnect anything... put the probe right into the connector assembly where the wire goes in... you should be able to make contact with the metal contact in the housing... be careful not to short anything....

Awesome... thanks!

We're going to try to fix this... so it does not get to the "gutting" point.... If you reach that point... then sell it as is... use the money and go for a more generic approach for a mame/multi-game solution.  :cheers:
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #8 on: March 06, 2008, 03:19:21 pm »
Yes the CPU is the decoder...

Download the stargate upright drawing set... it has all the schematics and interconnections... here is an excerpt from the drawing set...

put your multimeter on VDC and connect the black (common lead) to the GROUND as indicated in the pic... then connect your red lead to each of the other +5, +12 and -5 and record their readings...

oh.. and don't disconnect anything... put the probe right into the connector assembly where the wire goes in... you should be able to make contact with the metal contact in the housing... be careful not to short anything....

Awesome... thanks!

We're going to try to fix this... so it does not get to the "gutting" point.... If you reach that point... then sell it as is... use the money and go for a more generic approach for a mame/multi-game solution.  :cheers:

Yeah, good idea. It's just frustrating for me. I've been working on computers and software for 25 years, and feel so much more comfortible with the idea of a PC, computer monitor, keyboard encoder, and so on. I guess I need to learn something about these machines if I'm going to own one.

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #9 on: March 06, 2008, 03:29:01 pm »
Yeah, good idea. It's just frustrating for me. I've been working on computers and software for 25 years, and feel so much more comfortible with the idea of a PC, computer monitor, keyboard encoder, and so on. I guess I need to learn something about these machines if I'm going to own one.

You will be surprised... its not that bad... Williams boards are well documented and don't have a pile of custom ICs... all really standard stuff and pretty basic... I would say 90% of Williams failures are due to connectors and power supply voltage weakness...

Do you know if your machine is still using the original power supply or has a switcher installed?  You can tell if switcher is installed if there is a rectangular metal box with screw terminals connected to the wiring system of the cabinet... people tend to leave the original supply in and just hook up the new switcher in tandem.
Happy Gaming!

ahofle

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 4544
  • Last login:August 30, 2023, 05:10:22 pm
    • Arcade Ambience Project
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #10 on: March 06, 2008, 03:46:48 pm »
Just wanted to say :cheers: to RetroACTIVE.

Kaytrim

  • I'm too nice a guy
  • Trade Count: (+4)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 2095
  • Last login:September 22, 2015, 04:11:30 pm
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #11 on: March 06, 2008, 03:51:25 pm »
Just wanted to say :cheers: to RetroACTIVE.

I agree.  This baby is worth saving. :applaud:

p.s. Maybe this thread should be moved to the Arcade Miscellaneous forum.

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #12 on: March 06, 2008, 03:57:06 pm »
Yeah, good idea. It's just frustrating for me. I've been working on computers and software for 25 years, and feel so much more comfortible with the idea of a PC, computer monitor, keyboard encoder, and so on. I guess I need to learn something about these machines if I'm going to own one.

You will be surprised... its not that bad... Williams boards are well documented and don't have a pile of custom ICs... all really standard stuff and pretty basic... I would say 90% of Williams failures are due to connectors and power supply voltage weakness...

Do you know if your machine is still using the original power supply or has a switcher installed?  You can tell if switcher is installed if there is a rectangular metal box with screw terminals connected to the wiring system of the cabinet... people tend to leave the original supply in and just hook up the new switcher in tandem.

My machine has this power supply, or something similar looking.



As well as a large transformer in the bottom of the cabinet.

Where can I get the 4164 ram chips? Do I need to mod my cpu board to use them?

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #13 on: March 06, 2008, 04:02:19 pm »
That is the original power supply... if it has never been reconditioned... then the caps are pretty old and maybe not doing their job so well... ;)

For 4164 mod... you need a simple jumper to go between your CPU board and the CPU board power connector, basically it bypasses the +12v and -5V requirement.  Then you replace your RAM chips...

Bob Roberts sells the jumper and also 4164 ram in sets of 24... he also sells Williams power supply rebuild kits too! ;D
« Last Edit: March 06, 2008, 04:09:33 pm by RetroACTIVE »
Happy Gaming!

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #14 on: March 06, 2008, 04:03:15 pm »
p.s. Maybe this thread should be moved to the Arcade Miscellaneous forum.

Yup... I've already notified moderators...  :cheers:
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #15 on: March 06, 2008, 04:19:35 pm »
That is the original power supply... if it has never been reconditioned... then the caps are pretty old and maybe not doing their job so well... ;)

For 4164 mod... you need a simple jumper to go between your CPU board and the CPU board power connector, basically it bypasses the +12v and -5V requirement.  Then you replace your RAM chips...

Bob Roberts sells the jumper and also 4164 ram in sets of 24... he also sells Williams power supply rebuild kits too! ;D

Since you've been so helpful, I have another questions for you. While poking around under my control panel, there appears to be a ground ribbon that looks like it used to be connected to both the interior cabinet, and the bottom side of the control panel, possibly to the joystick housing. It's a braided ribbon.

Now, it's not attached to anything other than the bottom side of the control panel. It's attached with a staple about midpoint in the ribbon. Both ends are not attached to anything. Should they be?? I didn't disconnect them, but it's possible someone else did. At some point prior to this current issue, I was having problems with the control panel not working.

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #16 on: March 06, 2008, 04:34:36 pm »
Since you've been so helpful, I have another questions for you. While poking around under my control panel, there appears to be a ground ribbon that looks like it used to be connected to both the interior cabinet, and the bottom side of the control panel, possibly to the joystick housing. It's a braided ribbon.

Now, it's not attached to anything other than the bottom side of the control panel. It's attached with a staple about midpoint in the ribbon. Both ends are not attached to anything. Should they be?? I didn't disconnect them, but it's possible someone else did. At some point prior to this current issue, I was having problems with the control panel not working.

Thats the ground braid, Williams grounded every metal piece of the cabinet by strapping the braid from here to there to everywhere back to the 3rd prong of the AC plug (earth ground).  There are good reasons for grounding everything... as long as you have a good earth ground, using a 3-2 prong adapter or busting your plug... basically breaks the whole thing.  Good ground = good... bad ground = bad!  Some people choose to not ground the metal pieces just in case the unit is not properly earth grounded.  Personally, I think it should be configured the way it was from the factory... In your case... I would not worry about that so much for now... its way far away in the scheme of things.  We can re-connect it later.

Edit:

I almost forgot... the problem you were having earlier most likely the ground braid was not the case... since the controls get their ground from the wire harness... Your problem was likely weak connection back at the I/O board or dirty contacts.  You can clean the contacts rubbing a business card in between them while they are compressed.
« Last Edit: March 06, 2008, 04:51:40 pm by RetroACTIVE »
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #17 on: March 06, 2008, 04:42:19 pm »
Since you've been so helpful, I have another questions for you. While poking around under my control panel, there appears to be a ground ribbon that looks like it used to be connected to both the interior cabinet, and the bottom side of the control panel, possibly to the joystick housing. It's a braided ribbon.

Now, it's not attached to anything other than the bottom side of the control panel. It's attached with a staple about midpoint in the ribbon. Both ends are not attached to anything. Should they be?? I didn't disconnect them, but it's possible someone else did. At some point prior to this current issue, I was having problems with the control panel not working.

Thats the ground braid, Williams grounded every metal piece of the cabinet by strapping the braid from here to there to everywhere back to the 3rd prong of the AC plug (earth ground).  There are good reasons for grounding everything... as long as you have a good earth ground, using a 3-2 prong adapter or busting your plug... basically breaks the whole thing.  Good ground = good bad... ground = bad!  Some people choose to not ground the metal pieces just in case the unit is not properly earth grounded.  Personally, I think it should be configured the way it was from the factory... In your case... I would not worry about that so much for now... its way far away in the scheme of things.  We can re-connect it later.

Edit:

I almost forgot... the problem you were having earlier most likely the ground braid was not the case... since the controls get their ground from the wire harness... Your problem was likely weak connection back at the I/O board or dirty contacts.  You can clean the contacts rubbing a business card in between them while they are compressed.

Got it, Thanks!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #18 on: March 07, 2008, 08:41:45 am »
Yes the CPU is the decoder...

Download the stargate upright drawing set... it has all the schematics and interconnections... here is an excerpt from the drawing set...

put your multimeter on VDC and connect the black (common lead) to the GROUND as indicated in the pic... then connect your red lead to each of the other +5, +12 and -5 and record their readings...

oh.. and don't disconnect anything... put the probe right into the connector assembly where the wire goes in... you should be able to make contact with the metal contact in the housing... be careful not to short anything....

I checked those connections and here are the voltages:

Number 9: 5.13
Number 8: 12.48
Number 7: 4.75
Number 5: 12.27

Should number 7 be 5 volts? Is that my problem?

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #19 on: March 07, 2008, 08:58:10 am »
I checked those connections and here are the voltages:

Number 9: 5.13
Number 8: 12.48
Number 7: 4.75
Number 5: 12.27

Should number 7 be 5 volts? Is that my problem?

Good Job!

Ok... pin 7 should be between 4.9 and 5.1 volts... yes it looks a little low  ;D

The rest look ok... except you listed pin 9 as 5.13.... do you mean -5.13...
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #20 on: March 07, 2008, 09:07:08 am »
Good Job!

Ok... pin 7 should be between 4.9 and 5.1 volts... yes it looks a little low  ;D

The rest look ok... except you listed pin 9 as 5.13.... do you mean -5.13...

Yeah, I must have missed the negative sign.

So... how do I fix that, new switching power supply? I'm pretty sure I can track that down if that's the case, but what's the process of installing it?

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #21 on: March 07, 2008, 09:16:28 am »
Good Job!

Ok... pin 7 should be between 4.9 and 5.1 volts... yes it looks a little low  ;D

The rest look ok... except you listed pin 9 as 5.13.... do you mean -5.13...

Yeah, I must have missed the negative sign.

So... how do I fix that, new switching power supply? I'm pretty sure I can track that down if that's the case, but what's the process of installing it?

There are two possible paths here...

Install a switcher... as you have said... or re-build your linear supply...  depending upon your comfort level either one is acceptable...

Before we go there... lets try one more thing...

You see... as connectors get old and begin to loose their resilience... they begin to loosen up and create intermittent and sometimes resistive faults... I would recommend you unplug and plug the power connector from the PCB a couple of times to refresh it... then re-measure your voltage to see if there is a change...
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #22 on: March 07, 2008, 09:34:23 am »
There are two possible paths here...

Install a switcher... as you have said... or re-build your linear supply...  depending upon your comfort level either one is acceptable...

Before we go there... lets try one more thing...

You see... as connectors get old and begin to loose their resilience... they begin to loosen up and create intermittent and sometimes resistive faults... I would recommend you unplug and plug the power connector from the PCB a couple of times to refresh it... then re-measure your voltage to see if there is a change...

I had read that could help, so that's what I tried first. I did that with most of the power connections on the cpu and other boards already.

If it will help, for the cost, I'd rather just replace the power supply. I was checking on arcadeshop.com and they have both a generic "15amp switching power supply (+5vdc @ 15A, +12vdc @3A and -5vdc @1A)"



and also a "Stargate power supply conversion kit".



Which one, or something else??


RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #23 on: March 07, 2008, 09:38:31 am »
You could go arcadeshop or Bob Roberts... If you use Bob... you can upgrade your RAM while your at it  8)
Happy Gaming!

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #24 on: March 07, 2008, 09:45:30 am »
http://homearcade.org/BBBB/parts.html

Check the bottom of the page... he offers the Williams switcher kit for $45... with instructions  :D

Also

Wms 4116 to 4164 Ram Power Adaptor                        $8.50
4164 Ram (Alt Mfrs 3764 - 4264 - 4864 - 8264 - 9064)    $1.00 ea.

I think the power adapter is pricey... but if you don't have the stuff its all done for ya!
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #25 on: March 07, 2008, 09:47:34 am »
You could go arcadeshop or Bob Roberts... If you use Bob... you can upgrade your RAM while your at it  8)
Got it... thanks.
« Last Edit: March 07, 2008, 09:52:18 am by quanlee »

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #26 on: March 07, 2008, 09:56:31 am »
Ok... now I don't want you to get discouraged if this doesn't work... sometimes stuff seems obvious but does not always pan out... I can definitely say... your power supply is old and it is not quite keeping up the 5V rail well enough...

When you get through with this mod...(which is worth doing!) you will not have to worry about the 5V supply any more.  :cheers:
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #27 on: March 07, 2008, 10:03:37 am »
Ok... now I don't want you to get discouraged if this doesn't work... sometimes stuff seems obvious but does not always pan out... I can definitely say... your power supply is old and it is not quite keeping up the 5V rail well enough...

When you get through with this mod...(which is worth doing!) you will not have to worry about the 5V supply any more.  :cheers:

Yeah, I know, it's a crap shoot, this thing is 25+ years old.

If I change out the power supply, I assume I'm only replacing the power supply mounted up on the side of the cab, not the ancient looking transformer on the bottom of the cab, right?

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #28 on: March 07, 2008, 10:19:16 am »
http://homearcade.org/BBBB/parts.html

Check the bottom of the page... he offers the Williams switcher kit for $45... with instructions  :D

Also

Wms 4116 to 4164 Ram Power Adaptor                        $8.50
4164 Ram (Alt Mfrs 3764 - 4264 - 4864 - 8264 - 9064)    $1.00 ea.

I think the power adapter is pricey... but if you don't have the stuff its all done for ya!

If I use the 4116 to 4164 Ram Power Adaptor, does that mean I don't have to jumper my cpu board?

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #29 on: March 07, 2008, 10:42:32 am »
You are going to leave everything as is in the cabinet... you will not need to remove anything...Just find an appropriate place to mount the switcher and the harness that Bob provides will connect to the main power harness that normally would connect to the power pcb.

Yes... the power adapter does the jumpering for you... so you will not have to modify your pcb!   8)
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #30 on: March 07, 2008, 12:11:13 pm »
You are going to leave everything as is in the cabinet... you will not need to remove anything...Just find an appropriate place to mount the switcher and the harness that Bob provides will connect to the main power harness that normally would connect to the power pcb.

Yes... the power adapter does the jumpering for you... so you will not have to modify your pcb!   8)

If I have an AT or ATX computer power supply (prolly do in one of my many dead computers I have in my basement) can I use that rather than buying a new switching power supply?

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #31 on: March 07, 2008, 12:33:16 pm »
You are going to leave everything as is in the cabinet... you will not need to remove anything...Just find an appropriate place to mount the switcher and the harness that Bob provides will connect to the main power harness that normally would connect to the power pcb.

Yes... the power adapter does the jumpering for you... so you will not have to modify your pcb!   8)
Could you explain the relationship of the power supply and the transformer? Does the power come into the transformer, and get distributed to the power supply? Or vice versa? What is the purpose of the transformer?

Thaks for your help.


RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #32 on: March 07, 2008, 01:10:47 pm »
You are going to leave everything as is in the cabinet... you will not need to remove anything...Just find an appropriate place to mount the switcher and the harness that Bob provides will connect to the main power harness that normally would connect to the power pcb.

Yes... the power adapter does the jumpering for you... so you will not have to modify your pcb!   8)
Could you explain the relationship of the power supply and the transformer? Does the power come into the transformer, and get distributed to the power supply? Or vice versa? What is the purpose of the transformer?

Thaks for your help.



Sure...

The AC transformer has a few windings in it... for monitor isolation and stepping down the voltage for the power supply pcb... this is where the AC power comes in and is distributed out... like you stated.

The ac voltages off of the secondary winding of the transformer go to the power pcb where they are rectified and regulated.  The power pcb then puts out +5 regulated -5 regulated, +12 regulated, +12 unregulated, -12 unregulated to the different pcbs.  There is another connector on the power pcb that puts out unregulated and ac voltages to the coin door... ~6-7VAC to the lamps and ~24VDC to the lock-out coil.

So the switcher kit will replace all of the regulated voltages to each of the pcbs... that is 5VDC, -5VDC and +12VDC.... The switcher does not supply -12VDC (unregulated)... but the only pcb that needs that voltage is the sound board... which also takes +12VDC (unregulated)... and uses these two voltages and regulates them to create its own +5V DC power supply... so the switcher will supply the +12VDC and -5VDC to the sound board which will work just fine for this purpose... (basically it does not technically matter if you give a voltage regulator regulated voltages... it will still work... )

does this make sense?
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #33 on: March 07, 2008, 01:27:40 pm »
You are going to leave everything as is in the cabinet... you will not need to remove anything...Just find an appropriate place to mount the switcher and the harness that Bob provides will connect to the main power harness that normally would connect to the power pcb.

Yes... the power adapter does the jumpering for you... so you will not have to modify your pcb!   8)
Could you explain the relationship of the power supply and the transformer? Does the power come into the transformer, and get distributed to the power supply? Or vice versa? What is the purpose of the transformer?

Thaks for your help.



Sure...

The AC transformer has a few windings in it... for monitor isolation and stepping down the voltage for the power supply pcb... this is where the AC power comes in and is distributed out... like you stated.

The ac voltages off of the secondary winding of the transformer go to the power pcb where they are rectified and regulated.  The power pcb then puts out +5 regulated -5 regulated, +12 regulated, +12 unregulated, -12 unregulated to the different pcbs.  There is another connector on the power pcb that puts out unregulated and ac voltages to the coin door... ~6-7VAC to the lamps and ~24VDC to the lock-out coil.

So the switcher kit will replace all of the regulated voltages to each of the pcbs... that is 5VDC, -5VDC and +12VDC.... The switcher does not supply -12VDC (unregulated)... but the only pcb that needs that voltage is the sound board... which also takes +12VDC (unregulated)... and uses these two voltages and regulates them to create its own +5V DC power supply... so the switcher will supply the +12VDC and -5VDC to the sound board which will work just fine for this purpose... (basically it does not technically matter if you give a voltage regulator regulated voltages... it will still work... )

does this make sense?

Yes, starting to I think.

So once this conversion is done the power comes into the transformer, then is disributed to the monitor, and new switching power supply. The switching power supply provides power to all pcb's. Is the power going to the coin door still coming from the original power supply? Can that original linear power supply be removed?

I know you said it doesn't have to be remoevd, but can it?? Just trying to understand how this works.

Also... did you see my question about using a standard AT or ATX PC power supply?


RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #34 on: March 07, 2008, 01:34:50 pm »
Yes, starting to I think.

So once this conversion is done the power comes into the transformer, then is disributed to the monitor, and new switching power supply. The switching power supply provides power to all pcb's. Is the power going to the coin door still coming from the original power supply? Can that original linear power supply be removed?

I know you said it doesn't have to be remoevd, but can it?? Just trying to understand how this works.

Also... did you see my question about using a standard AT or ATX PC power supply?



You really can't remove the transformer... its necessary for the monitor ... you could live without the coin door lamps and strap the lockout coil...so technically the power pcb could be removed... but I wouldn't waste your time... its not going to hurt leaving it in there... plus if you ever decide to sell it... it will still be "original"... which makes it more valuable...

You could use an ATX... but really the problem with that is that it is not adjustable... switchers are pretty finicky about proper loads for the regulation to be correct.... plus you will have to jumper that big honkin 20PIN header so it will turn on correctly... I would stick with the kit from Bob... its cleaner and it will save you a bunch of time and will work with little or no bother.
« Last Edit: March 07, 2008, 02:03:59 pm by RetroACTIVE »
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #35 on: March 07, 2008, 02:48:36 pm »
What about this one?? Includes everything for PS and memory upgrade.

Click Here
« Last Edit: March 07, 2008, 03:01:31 pm by quanlee »

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #36 on: March 07, 2008, 02:57:28 pm »
What about this one?? Includes everything for PS and memory upgrade.

Looks fine... but I'm not too familiar with that switcher... the switcher that Bob sells is the defacto standard switcher nowadays... I have used a few ... the adjustment makes it easy to calibrate the supply to your system... and is fairly cheap...

$45 (psu kit) + $24 (ram) + $9 (adapter) = $78.00... still cheaper than that ebay auction, Bob won't gouge you on shipping either. probably around 6-10bucks (depending upon where you live).
« Last Edit: March 07, 2008, 03:07:54 pm by RetroACTIVE »
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #37 on: March 15, 2008, 11:58:35 am »
I installed the new switching power supply and upgraded the ram and it still gives me the 1-2-1 error code on the ROM board. What now??
« Last Edit: March 15, 2008, 12:09:38 pm by quanlee »

cw

  • Trade Count: (+7)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 792
  • Last login:March 12, 2024, 07:18:37 pm
  • Game over man game over
    • The Cab
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #38 on: March 15, 2008, 12:54:31 pm »
check the for the proper voltages on the ram then start looking for broken traces to that slot.

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #39 on: March 15, 2008, 02:32:38 pm »
I installed the new switching power supply and upgraded the ram and it still gives me the 1-2-1 error code on the ROM board. What now??

It could very well be the socket itself... over time they loose thier strength and can be intermittent.... you can check this by disconnecting the board and using your multimeter to measure the resistance from the pin of the chip (top side) to the solder connection below...

Also like cw stated... double check your +5V

Don't give up yet... :)
Happy Gaming!

CheffoJeffo

  • Cheffo's right! ---saint
  • Wiki Master
  • Trade Count: (+2)
  • Full Member
  • *****
  • Offline Offline
  • Posts: 7780
  • Last login:February 02, 2024, 01:02:45 pm
  • Worthless button pusher!
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #40 on: March 16, 2008, 09:51:24 am »
I avoided this thread becasue of the "gut and mame" label -- mistake on my part.

Great thread and big  :applaud: :cheers: to everybody!!
Working: Not Enough
Projects: Too Many
Progress: None

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #41 on: March 16, 2008, 05:05:00 pm »
I avoided this thread becasue of the "gut and mame" label -- mistake on my part.

Great thread and big  :applaud: :cheers: to everybody!!

Yeah... I agree the title is a bit scary!  I just didn't (still don't) want it to get to "that" point... Williams boards are fixable... sometimes a little misleading... but fixable...  ;D
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #42 on: March 17, 2008, 07:46:17 am »
What should be voltages be for that chip? How do I measure it? What should the resistance be from front to back?

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 error code, gut and mame???
« Reply #43 on: March 17, 2008, 08:06:29 am »
What should be voltages be for that chip? How do I measure it? What should the resistance be from front to back?

Got it...

The 4164 RAM only uses +5... so if your +5 is good then your fine... btw... did you double check your +5 volts with your new supply ( I suspect its fine but its worth a quick check).

I would check the contact resistance (with the board off, disconnected and removed from the mounting plate).  You would do this by setting your multimeter to ohms.... you will have to put one probe (probe choice does not matter here, there is no polarity concerns when measuring plain old resistance) on the top of the chip (right on the pin) and the other probe on the solder pad beneath the chip (on the bottom of the board) and you should measure a direct connection of 0 ohms.  This will tell you that the chip is connecting to the socket and the socket is connecting to the rest of the printed circuit board.  Do this for each pin...

I'm going to review the schematic and check the chip select for that device so we can continue tracing if this does not turn up anything suspicious.

« Last Edit: March 17, 2008, 08:09:00 am by RetroACTIVE »
Happy Gaming!

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #44 on: March 17, 2008, 12:44:58 pm »
I've traced the path... on the schematic...

The line(s) that drive bank 2 begin at decoder prom 3G (7461) continue to address decoder mux 4G (74LS139) to inverter 5K (7404) to a triple input nand 4L (7410) where the signal is combined with others to create Write Enable 2L active low (WE2L/) and is connected to pin 2 of each of the 4164's of bank 2.

The fault could be anywhere along this path... provided the ic socket is doing its job... I suspect bank 2 is not getting selected at all so it fails the first test of the first device...
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #45 on: March 17, 2008, 12:50:27 pm »
I've traced the path... on the schematic...

The line(s) that drive bank 2 begin at decoder prom 3G (7461) continue to address decoder mux 4G (74LS139) to inverter 5K (7404) to a triple input nand 4L (7410) where the signal is combined with others to create Write Enable 2L active low (WE2L/) and is connected to pin 2 of each of the 4164's of bank 2.

The fault could be anywhere along this path... provided the ic socket is doing its job... I suspect bank 2 is not getting selected at all so it fails the first test of the first device...

So do I test it as you suggested above then? I have a guy that contacted me to repair the cpu board if I send it to him, what should that normally cost me??

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #46 on: March 17, 2008, 12:56:14 pm »
I've traced the path... on the schematic...

The line(s) that drive bank 2 begin at decoder prom 3G (7461) continue to address decoder mux 4G (74LS139) to inverter 5K (7404) to a triple input nand 4L (7410) where the signal is combined with others to create Write Enable 2L active low (WE2L/) and is connected to pin 2 of each of the 4164's of bank 2.

The fault could be anywhere along this path... provided the ic socket is doing its job... I suspect bank 2 is not getting selected at all so it fails the first test of the first device...

So do I test it as you suggested above then? I have a guy that contacted me to repair the cpu board if I send it to him, what should that normally cost me??

... I don't know really what the going rate is... I would assume you'll be out at least 100-150 bucks...  If you want I can fix it for you... you would just have to pay for shipping and maybe parts... as I have a few that I could use... I would not charge you labor..

give it some thought.
Happy Gaming!

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #47 on: March 17, 2008, 01:01:16 pm »
Give me the board number off of the pcb... its right around the battery holder.
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #48 on: March 17, 2008, 01:05:49 pm »
Give me the board number off of the pcb... its right around the battery holder.

I'll get it tonight, get back to you tomorrow. Thanks for the offer.

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #49 on: March 17, 2008, 08:55:21 pm »
Give me the board number off of the pcb... its right around the battery holder.

I checked all of the RAM pins vs. the ohms off the solder connection below, all checked out ok.

The number off my board is 5770-09656-00 REV. B


RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #50 on: March 18, 2008, 08:49:16 am »
Give me the board number off of the pcb... its right around the battery holder.

I checked all of the RAM pins vs. the ohms off the solder connection below, all checked out ok.

The number off my board is 5770-09656-00 REV. B



I can definitely fix that for you... the most it would cost in parts is about 26 bucks if you need a new set of decoder proms... if you don't need the decoder proms... and its just a basic logic failure, I've got plenty of extra parts that I would give up for free...  I also have access to very good solder/rework tools... and can assure you your pcb will not be damaged or butchered in anyway by repairs  ;D  I'm pretty picky about these things.

Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #51 on: March 18, 2008, 09:11:34 am »
Quote
I can definitely fix that for you... the most it would cost in parts is about 26 bucks if you need a new set of decoder proms... if you don't need the decoder proms... and its just a basic logic failure, I've got plenty of extra parts that I would give up for free...  I also have access to very good solder/rework tools... and can assure you your pcb will not be damaged or butchered in anyway by repairs  ;D  I'm pretty picky about these things.

Awesome!! I e-mailed you regarding your shipping address. Did you get it? I have the board here at work with me, ready to ship. I assume you only need the cpu board?

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #52 on: March 18, 2008, 09:14:28 am »
Quote
I can definitely fix that for you... the most it would cost in parts is about 26 bucks if you need a new set of decoder proms... if you don't need the decoder proms... and its just a basic logic failure, I've got plenty of extra parts that I would give up for free...  I also have access to very good solder/rework tools... and can assure you your pcb will not be damaged or butchered in anyway by repairs  ;D  I'm pretty picky about these things.

Awesome!! I e-mailed you regarding your shipping address. Did you get it? I have the board here at work with me, ready to ship. I assume you only need the cpu board?

Yup ... I only need the cpu... I got your e-mail and have replied with my address...
Happy Gaming!

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #53 on: March 20, 2008, 09:42:26 pm »
I've received your PCB... I've got it running! :applaud: :applaud: :applaud: :applaud:

It was indeed the triple input nand (7410) WE2L/ selector gate.  I sent you an e-mail but my e-mail is sputtering... just wanted to get the good news through!

I'll follow up with you with whats next....
Happy Gaming!

DJ Infinity

  • Trade Count: (+12)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 349
  • Last login:January 19, 2012, 03:48:16 pm
Re: My Stargate needs help... 1-2-1 ram error
« Reply #54 on: March 21, 2008, 04:18:01 pm »
This thread is like a soap opera. It is nice to see people come together for the common good in these days.  :cheers: Retroactive if someething ever goes wrong with my Blitz machine when I get it I hope you can help me :)
If You Are Going To Meddle At Least Listen

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #55 on: March 21, 2008, 04:23:51 pm »
This thread is like a soap opera. It is nice to see people come together for the common good in these days.  :cheers: Retroactive if someething ever goes wrong with my Blitz machine when I get it I hope you can help me :)

Yeah... not sure what I would have done without help... prolly gutted my Stargate, Mame, Play.... I don't have time for stuff that doesn't work. I probably picked the wrong hobby.

DJ Infinity

  • Trade Count: (+12)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 349
  • Last login:January 19, 2012, 03:48:16 pm
Re: My Stargate needs help... 1-2-1 ram error
« Reply #56 on: March 21, 2008, 07:04:50 pm »
I wouldn't give up on a game I really wanted.  :dunno I would've forked over the cash to have it fixed if it was outta my league. I like you work on computers as well but don't have the luxury of a multimeter. I think In the next coupla months I will buy a set of backup boards to my game with a backup Hard drive
« Last Edit: March 21, 2008, 07:19:37 pm by DJ Infinity »
If You Are Going To Meddle At Least Listen

SirPeale

  • Green Mountain Man
  • Global Moderator
  • Trade Count: (+23)
  • Full Member
  • *****
  • Offline Offline
  • Posts: 12963
  • Last login:August 04, 2023, 09:51:57 am
  • Arcade Repair in New England
    • Arcade Game and Other Coin-Op Projects
Re: My Stargate needs help... 1-2-1 ram error
« Reply #57 on: March 21, 2008, 08:06:22 pm »
I like you work on computers as well but don't have the luxury of a multimeter.

Why not get yourself a cheap multimeter?  They come in handy for all kinds of this stuff.  Voltage reading, continuity checking, diode/transistor checking...you can find them for under ten bucks.

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #58 on: March 21, 2008, 10:12:35 pm »
I wouldn't give up on a game I really wanted.  :dunno I would've forked over the cash to have it fixed if it was outta my league. I like you work on computers as well but don't have the luxury of a multimeter. I think In the next coupla months I will buy a set of backup boards to my game with a backup Hard drive

Sure... you can do the backup thing... also if you have to pay people to fix stuff for you... as long as you enjoy it...

I think Peale makes a real good point... multimeters... aint that much... and can go a long way for diagnosing common failures.   Get comfortable with it and it just kind of goes from there... stuff starts to become less mysterious... and before you know it ... your pretty darn good at it.  8)

And yes... I certainly don't mind helping folks out from time to time.  Keeps my brain going!
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #59 on: March 22, 2008, 06:24:12 pm »
I'm starting to understand it a bit, testing the stuff you suggested with the multi-meter helped.

Thanks!!

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #60 on: March 24, 2008, 02:05:51 pm »
Done with rework... burn in tonight.

besides the bad logic IC... here is what has been done:

- replaced 40pin and 20pin headers with gold contact headers
- replaced all electrolytic caps
- reworked factory white wires and moved to underside of pcb
- added 2 pin header jumper for composite sync inversion... the board originally had a pretty long bare wire used as a jumper (somebody had already modified the board)... so I changed it to a standard .1 header with a jumper plug... if you ever decide to use negative composite sync ... simply remove the jumper and use pin 7 of the video header as the composite sync signal.

I will ship it out tomorrow.
 :cheers:
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #61 on: March 24, 2008, 02:32:59 pm »
Why would it have been modified?

The monitor had been replaced with a Ms Pacman or Pacman monitor at one point, it's burned in with the maze pretty bad. Would that have been the reason for the mod?

Speaking of burned in monitors, that's my next project, replacing the monitor. Any suggestions? I'm cheap, so it's got to be either used or new and inexpensive.

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #62 on: March 24, 2008, 02:38:53 pm »
Why would it have been modified?

The monitor had been replaced with a Ms Pacman or Pacman monitor at one point, it's burned in with the maze pretty bad. Would that have been the reason for the mod?

Speaking of burned in monitors, that's my next project, replacing the monitor. Any suggestions? I'm cheap, so it's got to be either used or new and inexpensive.

Most likely... the board that you have is not the original board that was in the cabinet... someone probably had swapped it out at one point in time... it's a common mod if you are putting williams boards into JAMMA cabs or want to use the single composite sync instead of the +V +H sync signals.

You just need a standard shelf mount 19" arcade monitor... you can get new ones for around 160-180 bucks... used ones for half that... you may be able to post on the BST and see if anyone in your area has a used one thats in good enough shape for you.
Happy Gaming!

RetroACTIVE

  • Trade Count: (+8)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1429
  • Last login:January 28, 2024, 04:27:52 pm
  • Gramps
Re: My Stargate needs help... 1-2-1 ram error
« Reply #63 on: March 24, 2008, 10:45:45 pm »
Here are some pics of your game in action!
Happy Gaming!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #64 on: March 24, 2008, 11:10:36 pm »
Awesome! can't wait to get it back.

Thanks!

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error
« Reply #65 on: March 31, 2008, 12:14:09 pm »
Done with rework... burn in tonight.

besides the bad logic IC... here is what has been done:

- replaced 40pin and 20pin headers with gold contact headers
- replaced all electrolytic caps
- reworked factory white wires and moved to underside of pcb
- added 2 pin header jumper for composite sync inversion... the board originally had a pretty long bare wire used as a jumper (somebody had already modified the board)... so I changed it to a standard .1 header with a jumper plug... if you ever decide to use negative composite sync ... simply remove the jumper and use pin 7 of the video header as the composite sync signal.

I will ship it out tomorrow.
 :cheers:

I got the board last Friday, installed it and it works great!!!

Thanks for all your help. :applaud:

cw

  • Trade Count: (+7)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 792
  • Last login:March 12, 2024, 07:18:37 pm
  • Game over man game over
    • The Cab
Re: My Stargate needs help... 1-2-1 ram error
« Reply #66 on: March 31, 2008, 05:51:38 pm »
Does anyone else get that warm fuzzy feeling when a classic comes back to life?


     ;D

quanlee

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
  • Last login:October 17, 2012, 11:31:22 am
Re: My Stargate needs help... 1-2-1 ram error (now 1-2-5)
« Reply #67 on: September 29, 2010, 04:31:11 pm »
and... the saga continues. I started remodeling my basement back in March 2009, so I moved my arcade machines to another part of my basement while I was doing that work. Didn't do anything with them, turn them on, nothing until just recently.

Now my Stargate machine get's an error 1-2-5 on power up. That tells me it's a RAM error, bank 2, chip 5. I pulled that chip, turned on, same error. I pulled chip 6, moved it to slot 5, same error. I pulled chip 4, and swapped it with chip 5, same error.

So... it's looking like a socket problem, and not the chip. I'm no good at soldering.

Any suggestions?? Anyone?

Knave Jack

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 102
  • Last login:August 14, 2015, 01:06:25 am
  • We're all mad here!
Re: My Stargate needs help... 1-2-1 ram error
« Reply #68 on: October 01, 2010, 09:00:35 pm »
If you are in SoCAl i will be happy to help. I have sockets and have re-socketed a Stargate and Joust, so I'm comfortable with working on the boards. Just let me know. Im in Orange County.
Mike

boudin4evr

  • Trade Count: (0)
  • Jr. Member
  • **
  • Offline Offline
  • Posts: 6
  • Last login:January 07, 2021, 12:13:26 pm
  • I want to build my own arcade controls!
Re: My Stargate needs help... error 22 error 21
« Reply #69 on: December 10, 2020, 06:19:01 pm »
Anybody have a list of error codes? I just got a stargate machine
Thanks
I’m getting errors and during play it quits and goes to green blue purple screen then stargate scores screen goes from all green to blue then says go