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Author Topic: Midway Games  (Read 100787 times)

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Offline channelmaniac

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Re: Midway Games
« Reply #240 on: October 16, 2016, 09:03:48 PM »
Model: Ms Pac Man
Symptom: Dead. "P" on screen. Board had attempted repairs done.

Removed solder short from between a RAM data line and +5v on the VRAM Addresser socket
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #241 on: October 16, 2016, 09:06:42 PM »
Model: Super Pac Man
Symptom: I/O 1 error

Reseated the I/O chip at 4F on the board and tested.
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Re: Midway Games
« Reply #242 on: November 16, 2016, 07:14:03 PM »
Model: Ms Pac Man
Symptom: Random crashes and reboots

Replaced hardened ribbon cable and bad Z80A CPU on daughter board. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #243 on: November 16, 2016, 07:15:37 PM »
Model: Ms Pac Man
Symptom: Dead. Nothing on screen

Note: Board had been hacked to a 1 ROM version with no daughter board

Replaced missing Sync Bus Controller and dead PROM at 4A to restore video. Fixed damaged edge connector with copper trace tape and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #244 on: December 19, 2016, 10:48:29 PM »
Model: Mortal Kombat 4
Symptom: Dead

Replaced custom logic chip at U48 and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #245 on: December 21, 2016, 08:25:33 PM »
Mortal Kombat 4
Symptom: No blue or green on screen

Replaced a bad LT1260CS analog amplifier IC in the video output section and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #246 on: January 20, 2017, 04:21:14 PM »
Model: Jr. Pac Man (DC Conversion)
Symptom: Loses sound as it warms up

Sound would go sputtery after 1 to 2 minutes of playing. It was a digital failure and not an analog. Narrowed down the problem to the PROM at 5S using component cooler and replaced the prom with a freshly programmed 82S129 and tested.
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 #247 on: January 20, 2017, 10:07:08 PM »
Model: Jr Pac Man (Field Kit)
Symptom: Missing colors, jerky movement of ghosts, missing music notes, bad sound effects

Replaced bad PROM at 9F with a freshly programmed 82S129 to fix the video issue. Replaced incorrect 330uf, 2200uf, and 14.7uf radial caps in the sound section with the proper axial ones, patched damaged traces on the 2200uf one, and replaced the physically broken volume control. Replaced the 7489 bipolar RAMs at 2H and 2J to fix the ghost movements. Checked the 7489 bipolar RAMs 7R and 7S by substitution and the 2 sound PROMs to no effect on the audio issues. Checked the 74xx logic in the sound section and found that when pin 1 of the 74LS157 at 6S and the 74LS158 at 6R were touched with the logic probe pin the game would go into a reboot loop. Replaced a bad 74LS163 at 2R to fix that issue. No dead gates were found so the sound section ICs were checked with an HP 10529a logic comparator. Replaced a bad 74LS283 at 6N that had a racing output on pin 10 to fix both sound issues and tested the game.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #248 on: January 27, 2017, 08:58:24 PM »
Model: Rally-X
Symptom: Dead.

Replaced bad board interconnect cable and a missing standoff. Tested. Board was missing text during intro and yellow graphics during the game. Replaced a bad PROM at location 8P on the video board and retested successfully.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #249 on: February 11, 2017, 01:39:25 PM »
Model: Ms Pac Man
Symptom: Dead

Replaced corroded pins on the bottom of the Z80 Sync Bus Controller, the socket that the controller fits into, and repaired cracked solder joins on the controller module. Replaced dead Z80A CPU and tested game without the daughterboard successfully but not with it. Replaced bad cable and cleaned corroded pins on a ROM on the daughterboard and restested successfully. Game played but ghosts and Pac were squares. Cleaned corroded ground pin on a character ROM and retested 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 #250 on: April 01, 2017, 09:26:48 PM »
Model: Jr. Pac Man
Symptom: Static noise in audio and corrupt graphics

Replaced a bad 74LS139 at 4E and tested. Its outputs were racing.
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 #251 on: April 09, 2017, 07:04:00 PM »
Model: Space Invaders
Symptom: White screen and hum in speaker.

Cleaned corroded ROM legs. Board would play but had lines across the rows of moving characters. Replaced a bad 74151 IC on the daughterboard 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 #252 on: April 09, 2017, 09:36:44 PM »
Model: Space Invaders
Symptom: Intermittent Audio

Replaced 5 LM3900 ICs and the LM377 audio amp chip. Game died during testing. Replaced bad 8080A CPU that would fail after getting hot. Retested.
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 #253 on: April 22, 2017, 07:28:41 PM »
Model: Space Invaders
Symptom: Garbage on screen

Removed the CPU and the board booted up to garbage instead of stripes, indicating a RAM issue. Replaced a 74157 driving the upper address lines on the RAMs and tested using the SI Test ROM. The board passed memory tests and most sound tests. The "extra" sound was a solid tone. Replaced a bad 556 timer IC 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 #254 on: May 10, 2017, 08:11:40 PM »
Model: Revolution X
Symptom: Will not save calibration or settings

Pin 20 of the SRAM IC had no signal. Traced it back to a corroded trace under a 74F138 IC. Patched the bad trace from Pin 20 of the SRAM IC to Pin 12 of the IC at U3. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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  • Few things are better than fixing an old game...
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Re: Midway Games
« Reply #255 on: July 03, 2017, 03:00:36 PM »
Model: Space Invaders Deluxe
Symptom: Dead

Board had no clock. Replaced 74160 at C7. Board booted but had no video. Replaced bad 10uf axial cap in the video output section and then had garbage on screen. Replaced 74174 with dead outputs at D7 and board was still dead, but had proper lines on the screen. Replaced bad RAM with a shorted output at H15 and tested. Board was making a very high pitched sound instead of the saucer sound. Replaced damage 28 pin socket on the sound IC and a shorted .1uf mylar cap next to it. Tested.
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 #256 on: July 09, 2017, 06:17:02 PM »
Model: Space Invaders
Symptom: Dead. Short circuit on board.

Replaced shorted 22uf tantalum capacitor and tested. No audio. Replaced bad LM3900 next to the volume control. Tested.
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 #257 on: July 09, 2017, 06:19:34 PM »
Model: Space Invaders Deluxe
Symptom: Dead

Replaced 2 x 9316B (74161) chips to fix the main board. Data line D2 was stuck low on the daughterboard with resistance of 22 ohms to ground. Replaced a shorted 74174 on the data shifter daughter card and the resistance raised to 326 ohms. Replaced another shorted 74174 on the daughterboard and tested the boardset.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Few things are better than fixing an old game...
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Re: Midway Games
« Reply #258 on: August 11, 2017, 09:58:28 PM »
Model: M-4 Tank
Symptom: Dead

Replaced 8 bad orange ROM sockets and one bad orange CPU socket. Replaced the 8 bad 82S2708 OTP ROMs with 4 x 2716 EPROMs and reset the jumpers for memory type and address decoding. Replaced 4 old 10uf capacitors. Board would boot but had garbage on the screen. Replaced one bad 74174 and a bad 25S10 IC on the daughterboard. Replaced 4 LM3900 comparators to fix sound issues. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Few things are better than fixing an old game...
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Re: Midway Games
« Reply #259 on: August 26, 2017, 08:52:14 PM »
Model: Pac Man (4-in-1 + High Score save hack)
Symtpom: Dead

Board had poor attempted repairs to the edge connector that caused it to not power up.

Repaired edge connector and booted game to see graphic corruption. Address line A2 was dead on the graphic ROMs on row 5. Patched damaged trace and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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