Build Your Own Arcade Controls Forum

Arcade Collecting => Restorations & repair => Topic started by: kampcool on June 04, 2011, 03:10:21 am

Title: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 04, 2011, 03:10:21 am

(http://i797.photobucket.com/albums/yy256/kampcool/OperationWOLF%20MortalKombat2%20DAY1/SN850747.jpg)
(http://i797.photobucket.com/albums/yy256/kampcool/OperationWOLF%20MortalKombat2%20DAY1/SN850739.jpg)
(http://i797.photobucket.com/albums/yy256/kampcool/OperationWOLF%20MortalKombat2%20DAY1/SN850738.jpg)
I have already ordered a new Marquee, and some competition joysticks.  I have really cleaned up the picture since I photographed it, but I still get interupted with a squashed presentation, and lines.......   The display is a Wells Gardner 25k7184 (K7000).   
 
Also, the machine restarts intermittenly, as if someone turned it off and back on.  The power supply is a u-san electron ltd Peter Chou 11-150v-3
 
I should probably address the power supply 1st, as this (but not probable) COULD be causing some display issues.  Start at the source, right? 
 
Any thoughts here, much appreciated.

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kalars123 on June 04, 2011, 04:08:45 am

It wouldn't surprise if your PS was causing that, are they rolling lines or static?, rolling lines like are normally caused by a grounding issue, or interference. IE like back in the day when your TV would go crazy when mom vacuumed

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 04, 2011, 05:30:01 am

Roger That, but these are static lines, always present, and then after unit heats up, (about 3 fights in) screen shrinks, and lines become predominate in the middle.  I just ordered a cap kit for a wells gardner k7000, we will see if that does the trick.     I cannot immediately find a link to the power supply.      Here are the numbers I have found:  U-San Electron Ltd. Peter Chou. Model USP 11-150V-3   Sn4101795 (which is also the patent#), Before I power up my Wells Gardner 25k7184, I really would like a replaced Power Supply.     HELP!?

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kalars123 on June 04, 2011, 10:01:03 am

If your restoring it to a working MK2 cabinet then you have 2 option's you can follow this guys stuff to use a PC power supply "350w would prolly be good"

http://www.habosarcade.com/MortalKombatMulti%20JammaCab.htm#PC%20Power%20Supplies (http://www.habosarcade.com/MortalKombatMulti%20JammaCab.htm#PC%20Power%20Supplies)

OR

http://www.happ.com/powersupplies/80000300.htm (http://www.happ.com/powersupplies/80000300.htm)
is what I use in my UMK3 cabinet

"edit"
also check what your -5v is putting out MK boards are VERY VERY finicky about -5 if it's not enough they will do all kinds of weird things.

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 06, 2011, 05:50:40 pm

there is a pot dial on my powersupply, i adjusted it acordingly, and have no power shutdowns anymore.

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 07, 2011, 06:42:07 am

I "SEE" that so clearly now.  My P/S is fine, it has a POT adjust, that I needed to tweak to get the -5.

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 09, 2011, 05:35:17 am

Got my new Comp Happ Joysticks, and a capkit today............More pictures incoming this weekend, as I take out that Wells Gardner 25k7184, and talk about those new HAPP competition sticks, as they are installed.

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 09, 2011, 11:40:20 pm

hey guys putting a cap kit in this weekend on this Wells Gardner 25k7184 (K7000).    Outside of the flyback, are there any other discharge concerns I should be aware of?   This is my 1st wellsgardner, so any tips would be appreciated.

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 11, 2011, 06:26:56 am

A couple of odd finds upon discharge and removal of my 25k7184 wellsgardner from this MK2 conversion.  Now please forgive me if I am wrong about identifying stuff, as I am green as the Panama jungle here, but I promise, I pickup quick.  Everything was normal looking, until I went to unplug the yoke connector(pretty sure thats what its called) off of the chasis board.
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850774.jpg)

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 11, 2011, 06:31:20 am

It was very cluttered in there, when I realized there was a big piece of rubber debris, wedged right to the bottom.
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850775.jpg)
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850776.jpg)
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850777.jpg)
I have no idea what it is, or its importance, but I have set it off to the side, as I know it doesnt belong.

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 11, 2011, 06:34:47 am

The second ODD thing I noticed was a vertically mounted sister board (THAT WAS SUPER LOOSE/FLAPPING IN THE WIND). 
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850779.jpg)
Whats this one called?

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 11, 2011, 06:41:27 am

Gee I wonder why I could just "Fonzerelly" gently to the right of my marquee, and get rid off THIS:
(http://i797.photobucket.com/albums/yy256/kampcool/OperationWOLF%20MortalKombat2%20DAY1/SN850748.jpg)
I bet if I just did a reflow here, she MIGHT be fine:
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850780.jpg)
Half of these joints are visibly loose.   

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 11, 2011, 07:21:06 am

But......what the hell, right.  Ive come this far.  I have a capkit, a new gun holder(I DID learn during the G07), and some solder.   Ive read ALOT of the Wells Gardner horrors, and I have to say, I am apprehensive.  I want to learn, and I do NOT want to dissapoint (teenagers are waiting).  
 
My biggest fear is discovering someone elses failed repair.   This sure doesnt look "stock",    OMG!   IS THIS COMMON?
 
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850783.jpg)
 

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 17, 2011, 06:28:42 am

Ill just assume this is what a stock wells gardner 25k7943 is supposed to look like.  Im at the half way point in the cap install, and I do miss working on the G07 already.  They must have mass produced these bad boys at a furious pace,........

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kampcool on June 17, 2011, 10:24:31 am

Yeah, I definately liked the capjob on the G07 better, it was labeled better, I guess.   However the Wells Gardner didnt have as many "Tight, small solder points"  I couldnt believe the sloppy factory solders on this 25k7184, tho..   The Canadians did A much more quality job on the G07.
This was intimidating, but wound up being easier than I thought (read too many horror stories, I guess).
 
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850829.jpg)
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850831.jpg)
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850832.jpg)
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850834.jpg)
(http://i797.photobucket.com/albums/yy256/kampcool/Mortal%20Kombat2/SN850838.jpg)

Title: Re: Mortal Kombat 2 Dynamo Conversion refresh : Kampcool
Post by: kalars123 on June 17, 2011, 01:31:23 pm

glad to see you got it working, sorry i couldn't be much more help but i know little to nothing about crt repair