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Author Topic: Midway Games  (Read 100806 times)

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Offline channelmaniac

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Re: Midway Games
« Reply #40 on: May 07, 2014, 08:42:01 PM »
Model: Pac Man Jr.
Symptom: Burnt edge connector.

Repaired connector traces with copper trace tape and tested.
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Re: Midway Games
« Reply #41 on: May 07, 2014, 08:42:14 PM »
Model: Galaga
Symptom: Dead. Stuck in reboot loop.

Removed a 68B09 CPU from socket 4H and installed the proper 51xx custom Namco chip. Replaced the 3 Z80 CPU sockets and the 6 ROM sockets. Board would still either be stuck in a reboot loop or act dead. When it acted dead the CPU was stuck in a reset loop. If the board was slightly flexed it would try to boot.

Replaced a bad socket on the 7xx chip. The VBLANK* signal was not getting to IC6A, pin 1, to keep the watchdog signal from resetting the CPU. Reset the DIP switches to factory settings and tested.

The board was now missing all text on the screen except the very top row, which was green instead of red. When playing game the flags showing the level were the wrong color and missing lines and the line showing the credits was missing.

This is handled by the EPROM at location 4L. It is fed by a 74LS273 at location 2L and 74LS86 at location 2N. These were good, the EPROM tested good by a programmer and by substitution. All the signals were correct on the custom chip at location 4H. The IC at 4H outputs the control signals for those images out pins 11 and 12 to pins 5 and 6 on IC 2N, a PROM. Checked the PROM and found that pin 9 was folded under the chip. This is the D3 output. Straightened the pin and tested the game.
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Re: Midway Games
« Reply #42 on: May 07, 2014, 08:42:24 PM »
Model: Galaga
Tip: Stuck in reboot

If the DIP switch for Video Freeze (6J, switch 5) is left on and the game restarted it will be stuck in a reboot loop until the switch is turned OFF. The effect is different than when you have bad CPU or ROM sockets on the CPU board where it shows RAM OK then reboots. In this case, it is showing ROM OK, RAM OK, and the rest of the normal text before suddenly rebooting.

If after replacing those CPU and ROM sockets (which should be done on ANY Galaga game that still have factory sockets) the board is still rebooting then check that switch. You'll save yourself headaches.
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Re: Midway Games
« Reply #43 on: May 07, 2014, 08:42:40 PM »
Model: Galaga
Symptom: Multiple problems. Board had been worked on before.

Board would boot but had no explosion sounds and would not accept inputs properly. Sprite graphics were missing every other vertical line and there were vertical blue noise 'tails' on the bottom of the screen.

CPU board: Replaced missing 00xx and 06xx ICs. They were in the box with the board but were not installed and had missing pins. Repaired broken pin 28 on custom IC 55xx to fix the input and sound problem.

Video board: The sprite problem would come & go with flexing the PC board. Replaced a bad socket and trace on pin 3 of 1C. Resoldered the SRAM socket on 2148 SRAM at 6B. The ground pin was not soldered properly. Resistory pack RM7 was bad and causing the blue vertical streaks.
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Re: Midway Games
« Reply #44 on: May 07, 2014, 08:42:50 PM »
Model: Galaga
Sympom: Dead. No video output.

Board was previously worked on and had problems on both the CPU board and Video board.

CPU board: Fixed one badly jumpered trace. Replaced a bad EPROM at 3K, the D1 and D2 lines were shorted internally. Replaced bad sockets on the CPU at 4M and the Namco custom chips at 4D, 2L, 2J, 2H, and 2E.

Video board: Cleaned board. The 6MHz clock signal was not getting to pin 1 on the 02XX IC at location 4H. Replaced bad sockets on Namco custom chips at 1N, 1L, 1H, and 4H. Fixed a broken leg on the 07XX chip at 1N and cleaned the legs on the custom ICs at 1N, 1L, 1H, and 4H. Cleaned the legs on the SRAM IC at 1K to finish the repair.
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Re: Midway Games
« Reply #45 on: May 07, 2014, 08:43:00 PM »
Model: Ms. Pac Man
Symptom: Dead

Removed the daughterboard and powered up the system without it to isolate problems. Some of the normal startup RAM tests are occurring but when it is supposed to switch to another area of RAM it reboots. Rebooting is NOT being kicked off by the watchdog timer.

Found that when the board was flexed it would boot normally. Found a cut on the trace coming from pin 3 of the 74LS367 buffer chip at 6R. This was the AB10 signal line feeding the 74LS139 2 to 4 selector that controlled the CS* (Chip Select) line on the 2114 SRAM ICs. Repaired the trace and the board would play as a Pac Man game with corrupt characters, normal since the Ms. Pac Man ROMs were in 5E/5F.

Replaced a broken 40 pin connector on the daughter board ribbon cable, reassembled the game and tested.
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Re: Midway Games
« Reply #46 on: May 07, 2014, 08:43:09 PM »
Model: Galaxian
Symptom: No Sync

Replaced a bad 74LS08 at location 6H and tested.
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Re: Midway Games
« Reply #47 on: May 07, 2014, 08:43:18 PM »
Model: Pac Man
Symptom: Dead

Board had attempted repairs already done.

There were a few pins on the machine pin sockets from the attempted repairs that weren't fully soldered in. Once that was done the symptoms looked like bad RAM. If the board was flexed it would give different bad RAM symptoms - All zeros, colored text/graphics, and even booted once.

Broke out the pscilloscope on this one... the upper data bits were horribly garbled. Replaced the 6 2114 SRAM sockets and tested. Board died during extended testing. The Reset* line died. Without the proper reset pulse at power on the Z80A CPU will never start.

Replaced a 74LS161 at location 9C to fix the reset circuit.
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Re: Midway Games
« Reply #48 on: May 07, 2014, 08:43:27 PM »
Model: Cruis'n USA
Symptom: Dead

Board was paired with a Cruis'n World and someone tried to troubleshoot by swapping parts.

Sorted out the ROMs with an EPROM programmer and eplaced 1 missing program ROM. Swapped the correct PALs back on the board 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 #49 on: May 07, 2014, 08:43:37 PM »
Model: Pac Man
Symptom: Garbled sound.

This board had been worked on before. There were many patches on this board and the IC at 1N had many traces and pads pulled. It also had many of its holes DRILLED out.

Removed a short between pin 5 and 11 on the 7489 RAM at 2L to fix a portion of the sound.

Removed short between pin 8 of 1N and R4. Patched open trace between pin 9 of 1N and R4. Now the sound disappeared. This was because one of the inputs on the digital switch was shorted directly to the resistor on the output.

Patched open trace between pin 7 of 1N and ground. Noticed that 1N was incorrect. Replaced the 4006 at 1N with a proper 4066 IC and redid many patches on the board then played a few games to test the board.
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Re: Midway Games
« Reply #50 on: May 07, 2014, 08:43:49 PM »
Model: Galaga
Symtpom: No sound and graphics problems

Installed a renew kit (new 24/28/40/42 pin sockets... resistor packs did not need replacing), cleaned all chip legs, and reinstalled the chips into their new sockets. Tested game. Game now works, with sound, but has a strange graphic anomaly: The player and enemy ships are all tilted to 45 degrees, player explosions are divided into four pieces, and enemy explosions are numbers 20 over 31. If the enemies are tilted to the left the numbers are upside down and if they are tilted to the right the numbers are right side up.

Checked the Graphics ROMs on the video board. Pins 1 and 2 were stuck low with very rapid racing pulses. Checked the 74LS153 at 1B and found it had normal inputs but bad outputs. Replaced the IC 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 #51 on: May 07, 2014, 08:44:00 PM »
Model: Galaga
Symptom: Missing some blue on motion graphics and random blue streaks on board

This was a very tough one to track down. The board worked fine until an extended burn-in was done. Swapped out the motion RAM (8 x 2147), the resistor packs that hold the data lines high, 1 PAL, and a couple other 74xx chips. Replaced the 74LS298 at location 5B to fix the missing blue. This chip multiplexes the 8 data output lines from the motion RAM into 4 for mixing with the text graphics and later with the starfield.

The random blue streaks was just as tough to track down. Checked the 74LS365 chips at 5A and 6A, swapped out 2 of the replacement Video RAM chips, and checked the 74LS157 at 4A. (Yes, 4A. It says 5A on the schematic, but there's a 74LS365 at that board location. The schematic has an error.) Traced the problem back to pin 10 on the 74LS20 at location 3A which feeds the LS157. Pin 10 is the 6MHz* clock. Swapped the 07xx IC to no change. Replaced the 74LS368 IC at location 3N to finish the repair.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #52 on: May 07, 2014, 08:44:10 PM »
Model: Ms Pac Man
Symptom: Hacked and missing parts

Board was missing the Z80 Sync Bus Controller and Z80 CPU. Replaced missing parts and the board worked, but had an odd problem with the text on the top and bottom lines of the screen.

The text was cut down the middle and repeated on the right side of the screen. "1UP   HIGH" was repeated on the left side and right side of the screen. The remaining text for HIGH SCORE and 2UP was missing. Same thing with "CREDIT 0" on the bottom.

Pin 4 of the middle 74LS157 was supposed to connect to pin 2 of the middle 74LS257 on both sides of the connector that plugs into the main board. Removed a blob of solder that was an attempted repair and soldered in a jumper to finish the repair.
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Re: Midway Games
« Reply #53 on: May 07, 2014, 08:44:19 PM »
Model: Pac Man
Symptom: Random reboots

Cleaned the Z80 Sync Bus controller chip's pins. This was the old custom chip version with tarnished legs, and not the daughterboard. Replaced the bad CPU socket and ROM 5E sockets to finish the repair.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #54 on: May 07, 2014, 08:44:29 PM »
Model: Pac Man
Symptom: Dead hacked board.

Board was poorly hacked and had jumper wires that were not soldered on one end.

Removed the 8 EPROMs for the Ms Pac Man bootleg hack, removed several jumper wires, fixed 5 cut traces, and installed freshly programmed Pac Man ROMs in rows 5 and 6. Tested game.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #55 on: May 07, 2014, 08:44:38 PM »
Model: Ms Pac Man
Symptom: Garbage on screen

Board was reported as dead with garbage on screen, but booted fine on the bench. If the ribbon cable to the daughter board was bumped, the board would reset. Replaced bad 40 pin socket on the daughter board and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #56 on: May 07, 2014, 08:44:48 PM »
Model: Ms Pac Man
Symptom: Dead: Garbage on screen, random audio tones

Board had a hacked ribbon cable that had at one time burned a wire. Also, a chip on the Z80 Sync Bus Controller had been replaced.

Checked the daughter boards. The VRAM Addresser had a bent pin 13. Straightened pin and reinserted the module. Checked the Z80 Sync Bus Controller and found that pin 14 had burned. Cleaned pin 14 and replaced both the Sync Bus Controller socket and the CPU socket.

The game would now run, but the moving characters were doubled - all the ghosts were blobs with 4 eyes and Ms Pac was made with 2 upper halves. Replaced 2 noisy 74161 and 1 noisy 74LS10 that had garbled signals on some pins. This cleaned up the signals, but didn't fix the issue. Replaced a bad 74LS157 driving the Character ROM address lines to finish the repair.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #57 on: May 07, 2014, 08:45:01 PM »
Model: Galaga
Symptoms: Graphics corruption

Replaced every tall, flat style resistor pack and tested. These packs are sources of a lot of problems on Galaga boards.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Midway Games
« Reply #58 on: May 07, 2014, 08:45:15 PM »
Model: Galaga
Symptom: Dead. Garbage on screen.

Installed all new 24/28/40/42 pin sockets. Cleaned the custom chips. Board would run but would die when hot. Replaced CPU at 4M to finish the repair.
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 #59 on: May 07, 2014, 08:45:25 PM »
Model: Ms. Pac Man
Symptom: Constant reboot. Trash on screen

Board would go through the normal boot cycle but would reboot before it would finish. There were random vertical lines on the screen. Replaced bad 74LS245 at 4H. Board would still reboot, but garbage was gone. A close look showed an error message flashing just before reboot. Replaced bad 2114 at 4P to finish the repair.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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