Hantarex 9000 - How to wire the verticle synch?

[slug54]

Ok I have been struggling with this monitor for awhile and it's driving me mad!!
I can get an image to stabalize and it looks good until screen resolution changes or cab is shut off and powered back on and the screen loses vertical hold.

The cab is an old Pac man cab and the origanal game PCB had the issue also on power up but was fine after adjusting verticle hold.

current setup is a PAC to jamma adapter from jammaboards.com connected to a J-pac and an arcadeVGA PCIX card

here is what is strange and this was how it was wired when I recieved the cab with Pacman PCB installed,

the Verticle Synch wire is connected to Vsynch on the 3 pin connector which is labeled as negative vsynch and a jumper wire on that connector plug is jumped from vsynch to the ground pin on that connector. there is no video ground wire coming to this connector only the vsynch wire .
I have tried ever possible configuration I can think of but it always will lose verticle synch and this is the only configuration that gives me a usable image at all. I have installed a cap kit from Bob Roberts but it did not help with this issue. If anyone has any ideas on a wiring change or component I can replace to fix this I would love to hear it.
Thanks
-Slug

[grantspain]

got a photo of how its connected monitor side?

[slug54]

Hey Grantspain, I am really glad you replied I have read some other posts of yours where you have helped other people with a very similar issue.

I attached a picture of the monitor connections.

the 6 pin connector is labeled on the board from left to right as follows:

1= red 2=Green 3=Blue 4=GND 5=Vsynch 6=Hsynch
Note that the yellow and Green wire for the synch's are not connected to anything I just have wires in the connector for easy connecting and testing.

The  4 pin connector is really on 3 pins on the board and is labeled as follows this time from right to left:

1=GND 2= -Vsynch   3 =  -Hsynch
Note -hsynch wire is not connected to anything
-VS and GND are wire nutted to Vsynch from my cable harness going to J-pac and pac to jamma adapter.

Let me know if you have any ideas or want me to try something.

Thanks again for taking the time.
-Slug

[grantspain]

you need -hsync connected to the jpac-forget about the gnd and -vsync wires for the moment,infact just remove them for the time being

in u.k it's wired all on the 6 pin plug  red/green/blue/vid ground/not used/sync

[slug54]

Ok Wired it to -hsync and disconnected the other 2 wires on that connector.
The video now rolls fairly rapidly horizontally and I cant get it to stop using the controls and the verticle I can get it to stop rolling for a few seconds and then it will start again.

-Slug

[grantspain]

you could link the sync wires or strap a 5k resistor fron vsync to vid ground
you could have a fault on the chassis also

[slug54]

Can you give me a little more details on these connections?
Are you saying take my vsync wire from the J-pac and run it to both the -HS and -VS pin on the monitor connector?

also if trying the 5k resistor do I connect the VS wire from J-pac to -VS on monitor and then the resistor from -VS on the monitor to  video ground?

Thanks for all your help.

[grantspain]

there is no such thing as vsync on jamma connectors-there is only composite sync which normally goes to -h sync on the monitor,some chassis like the -h and -v sync linked

5k resistor was a mod we did back in late 80's for mainly namco and snk boards on hantarex chassis,the mod was a a 5k resistro connected between video ground and the v sync on the chassis input plug

[slug54]

ok no luck with running the sync wire to both the -vs and -hs. I could not stabalize the image at all.
I tried the 5k to VG and it did not appear to make any noticable change in the symptom.

I'm pretty sure there is a component failure on the board as I have tried ever possible type of connection that I can think of.
any ideas or know of any common failures with this board? I'm thinking maybe one of the transistors in the circuit near the negative sync connector. the schematic I have is for a slightly different version which has a sync polarity switch that I dont have and it doesnt show the 3 pin connector only 6 pin.

[grantspain]

do you have a proper jamma board to test as could be an issue with the jpac

[slug54]

I do not have a  working JAMMA board. I do have a working Pacman JR board which would usually roll vertically on power up and have to be adjusted slightly each time.

[grantspain]

I would suggest doing a cap kit as the monitor showed this fault previously

[slug54]

I allready got a cap kit from Bob Roberts and installed it. It didn't have all the caps but most of them. I also changed the cap that was right next to the remote adjustment board connectior. I believe it was C18.

[grantspain]

i did have a 9000 chassis that would not lock vertically some months ago that was down to the tda1670 ic

[slug54]

Thanks,
I see that Bob Roberts has both IC's for $5 each.
I am going to order them today.I will let you know how it goes.
Thanks for all the help.

[slug54]

I replaced the tda1670 IC and re-tested and there was no change in symptoms. I then changed the other IC TDA2595 and after that I get no tube glow so I re-checked the b+ voltage and it now measures 140V where it was 130V before.
I'm going to pull the board and recheck my soldering and connections.

[slug54]

OK pulled the board and checked the solder connections on  the chip and all the connections seemed ok re-installed the board and now it powers up ok. re-tested and I still cant get a reliable verticle sync and the best sync that I get is by running the sync wire to -vs on the 3 pin connector and then jumping a wire to the VG pin on the same 3 pin connector.
I am starting to wonder if that connector is mis-labeled and what is labeled as GND is really -HS.
That would make more sense to me.
I am not sure if I have tried running the synch wire from J-Pac to only GND on that connector if it's labeled wrong that gould be the -HS connection and that might work.
I brought the board in the house to start checking some components. I will test it in the morning.

It sure would help if that connector was actually shown on my schematic so I could verify the connections.

[grantspain]

you can mess with sync and ground connections-won't cause any damage

[slug54]

Ok checking the traces on the board and that connectors pin 1 indicator is on the wrong end of the connector.

So what I thought was VG was -HS and vice versa.
I retested and now my most stable connection is with Sync from J-pac going to both -VS and -HS but running it to just -VS is almost the same. this has not improved the symptoms any because this is the same way I was wiring it previously.
knowing that is making me wonder if one of the caps could be installed backwards due to board labelings being incorrect.

I installed my caps with the exact polarity as they were removed and they match board markings but it looked like someone had replaced some of the caps previously as they had a black marker dot on top and the solder joints were not done at the factory.
anyone know of any incorrect cap markings on this board or have a good component side picture so that I can compare?
Grant can you elaborate on the resistor mod? I am not sure if I understand the connections correctly.
Thanks
-Slug

[grantspain]

not aware of any wrong markings of caps on the 9000 chassis,that mod is a 5k resistor just linked one end to the video ground on the signal plug and the other end to the vertical sync of the signal plug

[slug54]

Hey grant,
anything else I can check on this?
If not I'm going to have to find some other monitor solution for this cab.
without an accurate schematic I'm having trouble tracking down any bad solder joints or other issues.
by the way this board looks alot like the 9110 picture that I saw except that it doesnt have a fan but it does have the connector for the fan controller. Do you know of any cap polarity markings on the 9110 that are incorrect?

[grantspain]

not aware of any cap polarity issues on any of the hanty schems.

I was going suggest looking at your video card settings but you already stated the monitor was showing these symptoms previously on a standard 15khz board

the only difference your chassis should have is the extra plug for U.S wiring instead of a switch for the sync polarity

out of interest what voltage are you reading at the sync wire from the jpac

[grantspain]

i guess you could look at TR10 and TR11

[slug54]

3.06 VDC , I picked up the transistors I will try to get them installed tonight.

[slug54]

replaced TR10 and TR11 and it did not change. I did have a little scare when I forgot to plug in the remote adjustment board and only got a thin line on the screen.

[grantspain]

pretty much exhausted all possibilities now I'm afraid-next step would be to send the chassis to someone to check

[slug54]

Yeah, Thanks for all your help. Went ahead and pulled it out of the cab today. Not sure where I'm going to send it yet.
Thanks again.

[corycet]

On the picture you submitted, it shows both the negative and positive sync connectors being utilized. It should be one or the other and not both. Can you confirm that you are only using negative sync or positive sync?

[grantspain]

On the picture you submitted, it shows both the negative and positive sync connectors being utilized. It should be one or the other and not both. Can you confirm that you are only using negative sync or positive sync?

thats already been asked in a previous post

[corycet]

Where was it posted? I just read every post and still didnt see where the small connector wires were addressed.

[grantspain]

Where was it posted? I just read every post and still didnt see where the small connector wires were addressed.

3rd post-states how sync wires are connected

[corycet]

I must be blind, looked through the threads twice and missed it both times.

Have you tried to wire it using positive sync?

[slug54]

Yes, and I get a unusable image.
I really wish I could get this going . I'm going to re-check the caps again  and review the schematic I feel like one might be the wrong value or there could be a polarity issue even though they match the labeling on the board.