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Author Topic: Midway Games  (Read 100925 times)

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Offline channelmaniac

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Re: Midway Games
« Reply #260 on: August 26, 2017, 10:15:30 PM »
Model: Ms. Pac Man
Symptom: Dead

Repaired edge connector and replaced a bad ribbon cable connecting the daughter board. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #261 on: October 09, 2017, 03:49:16 PM »
Model: Ms Pac Man
Symptom: Graphic corruption. Must get edge connector 'just right' to power on.

Jumpered gouged trace and repaired edge connector with copper trace tape. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #262 on: October 09, 2017, 03:52:07 PM »
Model: Pac Man
Symptom: Graphic corruption, boxes on screen.

Replaced bad ROM at 5E. Board played but scoring at the top was corrupt. Replaced bad 74LS257 on the VRAM Addresser then repaired damaged edge connector with copper trace tape. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #263 on: October 21, 2017, 08:47:11 PM »
Model: NBA Jam
Symptom: 2 ROMs fail self test

Jumpered 2 corroded traces and tested. Recapped audio board as these commonly have cap issues and retested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #264 on: January 14, 2018, 04:08:14 PM »
Model: Jr. Pac Man

Complaint of : "Garbage on screen. Rusted chips."

Turned off DIP 8 (freeze) and tested. Lines in some graphics, sound and motion graphics issues. The rusted chips were the 7489 bipolar 64-bit RAMs. Replaced all 4 and tested the board.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #265 on: January 31, 2018, 09:45:05 PM »
Model: Mortal Kombat
Symptom: No audio

Board had attempted repairs done.

Found 1 damaged plated thru hole on U29 and 2 on U32. Patched the traces with Kynar wire and tested. Board had audio but it crackled and the audio amp chip would oscillate at high volume. Cleaned the board to fix the oscillation issue. Tracked the crackling back to the OKI audio chip and replaced it. Board had clear audio but the sound samples were corrupt sounding. Replaced bad sockets on U12 and U13 and cleaned the corroded pins on the sample ROMs to fix the sound samples. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #266 on: March 03, 2018, 09:56:56 AM »
Model: Rampage World Tour
Symptom: Graphic corruption

The game played, but had graphic corruption on the screen. It was the kind where the dots on the screen would change randomly which indicated an open data line somewhere. When this happens you can use a 'well calibrated finger' to run across the various chip legs until the screen goes crazy. Found a missing signal on a pin of the Orbit chip where the trace went under the chip. Jumpered the broken trace with 30ga Kynar and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #267 on: March 10, 2018, 09:37:02 PM »
Model: Bosconian
Symptom: Dead. Parts boards.

Lone video board was missing 2 RAMs, 1 resistor, 1 PROM, and 1 03xx custom IC. Replaced missing parts, replaced the 24/28/42 pin sockets, and replaced the 10 pin resistor packs cobbled on the board with the proper 9 pin ones.

Took at Bosconian to Galaga conversion CPU board and de-converted it. Added the 50xx custom, 6116 SRAM, and 74LS245 ICs. Replaced all the 24/28/40/42 pin single wipe sockets with new dual wipe ones. Replaced all the old style resistor packs and replaced a missing 08xx custom IC. Tested with a known good Galaga video board. Replaced the Galaga ROMs with Bosconian ROMs and tested it with the video board.

Replaced the radial capacitors someone cobbled on the CPU board with proper axial caps and retested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #268 on: April 06, 2018, 09:10:13 PM »
Model: Mortal Kombat 4
Symptom: No sync

Board had a burned component on it.

Replaced a burned 0 ohm SMT resistor in the video ground circuit then replaced a 1000 ohm SMT resistor and a surface mount 7407 in the sync drive circuit. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #269 on: May 22, 2018, 03:00:29 PM »
Model: Space Invaders
Symptom: Dead. Does nothing.

This was a horrible board to repair with failure upon failure to troubleshoot. Most of it was done with a logic probe then test ROMs, then an HP Logic Comparator to find the last dead gate.

Board blew fuse in my Kurz Kasch.

Replaced shorted tantalum capacitor in the audio amp circuit.

Blew fuse again

Replaced 2 shorted 1A diodes on the A board on the Kurz Kasch and replaced the fuse again. Excessive current draw killed the diodes.

ICs replaced:
C6 - 7442 - restored clock.
A5 - 7474 - restored divided clocks
A7 - 7404 - restored divided clocks
E7 - 74161 - restored divided clocks to RAM address lines
C4 - 74166 - restored video output
A6 - 7455 - restored video sync

Now that there's video, move on to why RAM looks bad and the CPU isn't running.

What looked like a couple of bad RAMs tested good in another board...

E4/D4 - 7404 - stuck outputs causing RAM read issues.
A1/C3/D7 - 74174 multiple stuck outputs
E3 - 7474 - Fixed stuck int causing CPU to never start
E2 - 7442 - Racing outputs causing ROMs to never read properly

Now it would boot the test ROM and pass tests but wouldn't boot the game ROMs. Tried a different test ROM and it failed the shifter test.

D6 - 7402 - Stuck output causing data to shifters to not be read back by CPU

ROM H - Wrong type for board... some odd mask ROM dated 1975
ROM F - Dead outputs.

Replaced the ROMs and tested successfully.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Offline channelmaniac

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Re: Midway Games
« Reply #270 on: May 22, 2018, 03:15:47 PM »
Tip: Midway 8080 L board ROM replacement

When replacing mask ROMs or EPROMs on a Midway 8080 series board you have some options

1. Re-strap the board. In other words, change the jumpers to change what type of ROMs you are using. This is good if you're replacing all of the tri-voltage ROMs (2708 or TMS2716) or 9316B mask ROM.

This can be difficult as there are many different revisions of the board. I know from revision F and earlier the ROM selects go to different pins. Also, I've seen three different revisions of the board where the strapping points are different. Extreme care must be taken to not apply +12v and -5v to a standard EPROM or 9316 mask ROM so double check everything if you're doing the strapping on your own.

2. Replace a single ROM. If you want to replace 1 tri-voltage ROM, well, you either better be able to program a replacements (I can...) or go back to option 1. For 9316B you can either replace it with a 2732 with the image stacked in the ROM (0-7FF and again from 800-FFF) or with a 2716 EPROM that has been modified.

The 2716 requires pin 21 to be tied high and on the 9316B it is tied low. To modify the 2716 EPROM, program it first, then bend pin 21 out parallel with the chip body and cut it short. Take a piece of Kynar wire and jumper from pin 21 to pin 24 (+5v) to tie the PGM pin to +5v. Now it can be plugged into the socket to take the place of a bad 9316B without having to restrap the board.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Midway Games
« Reply #271 on: June 02, 2018, 10:26:17 PM »
Model: Bosconian
Symptom: "Parts board"

Board came in missing a lot of ICs.

Replaced all 24, 28, 40, and 42 pin sockets and 3 of the old style resistor packs. Replaced 7 missing program ROMs, 2 missing 8xx customs, 1 missing 6xx custom, 1 7xx custom with bad leg rot, 1 missing 5xx custom, Installed 3 missing resistor packs, 1 missing 74LS368, and a missing video PAL. Installed 3 missing sound ROMs, replaced a video ROM with bad leg rot, installed a missing audio amp chip, and a missing coin counter driver transistor, installed 4 correct standoffs, and replaced the ribbon cable to finish the board and tested successfully.
« Last Edit: June 02, 2018, 11:20:55 PM by channelmaniac »
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Re: Midway Games
« Reply #272 on: June 02, 2018, 11:25:25 PM »
Model: Bosconian
Symptom: Dead

Replaced all the 24, 28, 40, and 42 pin sockets, then replaced all the old style, unencapsulated resistor packs. Replaced 5 bad mask ROMs with leg rot. Replaced 2 8xx customs and 1 7xx custom with leg rot. Replaced two broken standoffs. Boardset would boot then crash at RAM OK. Replaced bad CPU 2 and re-tested. Board ran but hand sparkling text on the left side of the screen. Replaced a bad 3xx custom at 4N on the video board and retested successfully.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Midway Games
« Reply #273 on: June 03, 2018, 08:22:04 PM »
Model: Bosconian
Symptom: Dead

Replaced the 24, 28, 40, and 42 pin sockets on the board. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #274 on: June 06, 2018, 09:09:07 PM »
Model: Galaga
Symptom: RAM Error 2L

Replaced bad 2114 RAM and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #275 on: July 01, 2018, 07:08:37 PM »
Model: Space Invaders
Symptom: Dead

Replaced 2 shorted Tantalum caps, 1 missing cap, and one physically broken cap. Board would then power up but had garbage on the screen and was stuck in watchdog. Replaced 2 x 74161 in the reset circuit on the upright board to fix stuck in reset issue. Board was still powering up with garbage. Replaced a bad 74174 and 74153 and board would boot the test ROM but fail every single RAM chip. Replaced bad 74157 and board would boot but was missing all sounds. Replaced the LM3900 at L2-3 and the saucer sound and bass notes were the only sounds working. Replaced all remaining (6!) LM3900 chips to restore all sound effects. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #276 on: July 21, 2018, 11:19:02 PM »
Model: NBA Jam
Symptom: No Audio

Recapped the audio board and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Offline channelmaniac

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Re: Midway Games
« Reply #277 on: July 21, 2018, 11:21:34 PM »
Model: Mortal Kombat II
Symptom: No Audio

Board had bad corrosion damage on the ROMs and their sockets.

Removed all 8 of the ROM sockets and all 6 ROMs from the sound board. Cleaned the board, recapped it, installed 6 new sockets, and cleaned the ROM legs. Replaced ROMs at U5 and U7 which had some missing legs and tested. Nothing, yet the heatsink was warm. Replaced the MB3731 audio amp IC and successfully tested the game.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #278 on: August 06, 2018, 09:53:55 PM »
Model: Space Invaders
Symptom: Dead

Board arrived with the clock crystal bent over and one leg pulled out of the board. Carefully straightened the pins on the crystal and reinserted it into the board and it showed flickering garbage on the screen. Replaced a bad 74LS157 at F7 to fix a racing address line issue. Changed the ROM strapping to convert the board from using TMS2716 EPROMs to 2732s. Replaced bad RAMs at G12 and H12 because of missing outputs and RAMs at G13 and H13 because of distorted output signals. The board would then boot a diagnostic ROM. Replaced bad RAMs at G8, G10, H11, G14, H14, and H15. Inserted freshly programmed 2732 EPROMs then tested board successfully. Socketed the remaining 6 original RAMs at the customer's request and burned the board in for a few hours.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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  • Few things are better than fixing an old game...
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Re: Midway Games
« Reply #279 on: August 11, 2018, 06:41:29 PM »
Model: Space Invaders
Symptom: Dead

Replaced shorted capacitor in the audio amplifier circuit and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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