Author Topic: Nintendo Arcade (Read 27961 times)

channelmaniac · « **Reply #60 on:** May 10, 2020, 01:51:59 PM »

Model: Donkey Kong
Symptom: No text or ladders

Replaced bad bipolar PROM on the video board. Tested.

channelmaniac · « **Reply #61 on:** May 10, 2020, 06:38:14 PM »

Model: Donkey Kong
Info: ROM Locations

For those repairing 2-board Donkey Kong games and using MAME ROM dumps to do it... the chips are out of order from what you find in dkong.zip

CPU Board:

CPU Program ROMs are OK...
5A = c_5at_g.bin = 2532 EPROM
5B = c_5bt_g.bin = 2532 EPROM
5C = c_5ct_g.bin = 2532 EPROM
5E = c_5et_g.bin = 2532 EPROM

Sound Program ROMs are different...
3F = s_3j_b.bin = 2716 EPROM
3H = s_3i_b.bin = 2716 EPROM

Bipolar PROMs are different:
2E = c-2k.bpr = 82S129
2F = c-2j.bpr = 82S129

Video Board:
Video ROMs are different...
7C = l_4m_b.bin = 2716 EPROM
7D = l_4n_b.bin = 2716 EPROM
7E = l_4r_b.bin = 2716 EPROM
7F = l_4s_b.bin = 2716 EPROM

3P = v_3pt.bin = 2716 EPROM
3N = v_5h_b.bin = 2716 EPROM

Bipolar PROM:
2N = v-5e.bpr = 82S129

channelmaniac · « **Reply #62 on:** June 21, 2020, 06:50:31 PM »

Model: Vs. Excitebike
Symtpom: B button not working

Found a cut trace under where a capacitor was previously removed from the board. Patched trace and tested.

channelmaniac · « **Reply #63 on:** August 07, 2020, 08:18:59 PM »

Model: Donkey Kong
Symptom: No vertical sync

Traced back through the vertical sync circuit to a dead pin 12 on the 74LS10 at 7A. Replaced the LS10 and tested.

channelmaniac · « **Reply #64 on:** October 09, 2020, 12:37:43 PM »

Model: Donkey Kong
Symptom: Dead, garbage on screen, and no vertical sync.

Board had attempted repairs done to it.

Found a .0022uf capacitor cobbed to cut legs of a cap in the vertical sync generator circuit. Repaired that. Inspected the CPU board andremoved the ROM at 5E to find a leg broken and the rest of the legs corroded. Removed the previously replaced socket and found preexisting damage - 2 cut and 1 partially cut traces. Patched the damaged traces, installed a new socket, and programmed / installed a replacement EPROM. Tested.

channelmaniac · « **Reply #65 on:** December 17, 2020, 10:34:30 PM »

Model: Donkey Kong
Symptom: Garbage on screen. Missing ROMs

Owner pulled ROMs and asked that a new set be installed.

Installed missing ROMs. Board had text/girder issues. Replaced a bad 74LS174 at 2M on the video board and tested. Problem was better, but still bad, the main CPU was crashing, and the sound CPU was not working. Checked the whole circuit and the circuits on the top board that send/receive data from the video board. Nothing wrong. Cleaned the sound CPU legs to fix that issue then cleaned the main CPU legs to fix the graphic corruption and crashing. Tested.

channelmaniac · « **Reply #66 on:** February 23, 2021, 07:49:28 PM »

Model: Donkey Kong Jr
Symptom: Dead

Cleaned multiple corroded legs on the overlay ROMs, program ROM, CPU, and DMA chip. Cleaned the ribbon cable connectors and replaced one bad ribbon cable. Tested.

channelmaniac · « **Reply #67 on:** February 23, 2021, 09:29:24 PM »

Model: Donkey Kong Jr
Symptom: Bad and missing sounds

Replaced missing C22, broken Q3, and broken C24 to fix jump sounds. Replaced C31 on the DAC. Replaced broken C27. Tested.

channelmaniac · « **Reply #68 on:** February 28, 2021, 08:21:02 PM »

Model: Donkey Kong
Symptom: Text overlay issue

Replaced 2x 2114 RAMs to fix the video issue and tested. Board was missing digital sounds. Turned VR2 all the way up and was barely able to hear the sounds. Replaced bad LM324 op-amp and tested.

channelmaniac · « **Reply #69 on:** March 16, 2021, 09:10:56 PM »

Model: Donkey Kong
Symtpom: Dead. Garbage on screen.

Cleaned the edge connector. Replaced 1 2114 RAM (Work RAM) and tested.

channelmaniac · « **Reply #70 on:** March 16, 2021, 09:13:07 PM »

Model: Donkey Kong
Symptom: Dead.

Cleaned edge connector. Cleaned the pins on the rainbow cable connection on the video board. Board displayed garbage on screen. Replaced dead 8257 DMA Controller. It was holding /BUSRQ low, causing the CPU to never start. Tested. Garbage text and corrupt graphics. Replaced a 2114 RAM on the video board. Tested.

channelmaniac · « **Reply #71 on:** March 16, 2021, 09:18:02 PM »

Model: Donkey Kong Jr
Symptom: Dead. Garbage on screen

Board had a High Score Save module installed. Removed module, repopulated the ROMs and CPU on the board and it booted. Obtained the code and programmed a replacement 27256 EPROM for the HS Save module. Test routine reported DMA Failure. Downward pressure on the module would cause that error to come and go. Removed CPU socket to discover a lifted pad and trace damage on pin 36 of the CPU. Replaced the socket and patched the traces with Kynar. Reinstalled the module and tested.

channelmaniac · « **Reply #72 on:** October 12, 2021, 10:44:02 PM »

Model: Donkey Kong
Symptom: No audio

Cleaned corroded pins on the audio CPU. Tested. The board ran, but had vertical streaking in all sprites. Tracked it backwards from the ECL RAM to the 10125 ECL clock buffer IC. Replaced it and tested.

channelmaniac · « **Reply #73 on:** March 20, 2022, 10:38:04 PM »

Model: Donkey Kong
Symptom: Sprites disappear on different sections of the screen.

On power up and after heat soak all that was apparent was a slight glitch in barrel graphics. Turned down the +5 until it was 4.6v on the video PCB and the problem showed. Replaced bad 74LS157 at 8S and tested.

channelmaniac · « **Reply #74 on:** April 25, 2022, 11:34:06 PM »

Model: Donkey Kong Jr
Symptom: Garbage on screen

Replaced bad 74LS245 at 6A on the CPU board. This chip latched data to/from the CPU board to the Video board.

channelmaniac · « **Reply #75 on:** April 25, 2022, 11:36:38 PM »

Model: Donkey Kong Jr
Symptom: Sometimes will not boot

Board had wrong IC installed in the sound CPU socket.

Replaced incorrect sound CPU and bad socket with a proper 8035 CPU chip and new socket. Tested. Falling sound was distorted. Replaced bad cap at C26 and tested. Tapped PCB and could make it crash. Cleaned dirty legs on the ROMs at 5B and 5C. Tested by banging the board harshly on the bench and seeing no reboots.

channelmaniac · « **Reply #76 on:** April 28, 2022, 06:36:35 PM »

Model: Double Donkey Kong
Symptom: No sync

Replaced the Horizontal and Vertical position pots. Tested. Video had horizontal stripes of color on the screen. Resoldered the bodge wire on Pin 27 on the ROM at 3N on the video PCB. Tested.

channelmaniac · « **Reply #77 on:** May 04, 2022, 10:26:35 PM »

Model: Donkey Kong (Cocktail 4-board)
Symptom: Sprite tearing and motion issues

Sprites were tearing vertically until the PCB warmed up then some sprites were missing sections. Mario would walk up the center of the ramps and not on the surface. When jumping, the motion was very jerky.

Replaced bad 74LS283 at location 3E on the Clock PCB and tested. No sound. Cleaned the pins on the sound CPU and the 2 sound ROMs. Tested.

channelmaniac · « **Reply #78 on:** May 18, 2022, 10:38:01 PM »

Model: Vs. Super Mario Bros
Symptom: Dead. No sync.

Cleaned edge connectors. Board booted to garbage. Replaced both CPU sockets, both PPU sockets, and cleaned the CPU legs. Installed missing jumper on the 2nd CPU socket required for SMB to run. Game booted but would immediately crash. Replaced 4 corroded ROM sockets and 4 corroded Program ROMs. Board died. Replaced bad 74LS04 on the /RESET line. Tested. Replaced 2 corroded Graphics ROMs. Tested.

channelmaniac · « **Reply #79 on:** May 18, 2022, 10:38:49 PM »

Model: Donkey Kong Jr
Symptom: Dead. Graphics corruption.

Replaced bad Z80 CPU and bad color ROM at 3P. Cleaned the Graphics ROM legs and tested.

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Author Topic: Nintendo Arcade (Read 27961 times)