Konami Repairs

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channelmaniac:
Model: The Simpsons
Symptom: Crashes Randomly

Board would pass self tests and play in attract mode but would crash randomly when playing the game and when running ROM tests from the menu. Replaced a mix-matched set of program EPROMs that were 120 to 200ns with 4 matched 100ns EPROMs. Board ran and passed all self tests. Played the game through to the end to test.

The 2 200ns EPROMs were too slow for the CPU and were causing random crashes..

channelmaniac:
Model: Teenage Mutant Ninja Turtles
Symptom: RAM/ROM errors

Board had physical damage. Fixed bent pins on 3 custom ICs. Resoldered one side of 2 custom ICs to fix solder wipe shorts. Repaired 9 gouged traces. Tested.

channelmaniac:
Model: Various
Tip: Konami 007232 Pinout

This is the D/A Converter IC used in many Konami games for sound effects along side the YM2151 FM music synthesizer chip.

Here is a preliminary pinout based on a Super Contra game that was pinned out. There are still unknown pins on the IC and missing functions that need to be mapped to it such as R/W and /IRQ. It is also missing a 3rd select line for ROM access select.

Code:

1 - CPU Data 0
2 - CPU Data 1
3 - CPU Data 2
4 - CPU Data 3
5 - CPU Data 4
6 - CPU Data 5
7 - CPU Data 6
8 - CPU Data 7
9 - Output Channel 1 - These connect to the 007340 DAC
10 - Output Channel 1
11 - Output Channel 1
12 - Output Channel 1
13 - Output Channel 1
14 - Output Channel 1
15 - Output Channel 1
16 - Gnd
17 - Output Channel 2 - These connect to another 007340 DAC
18 - Output Channel 2
19 - Output Channel 2
20 - Output Channel 2
21 - Output Channel 2
22 - Output Channel 2
23 - Output Channel 2
24 - ROM Data 7
25 - ROM Data 1
26 - ROM Data 8
27 - ROM Data 2
28 - ROM Data 6
29 - ROM Data 3
30 - ROM Data 4
31 - ROM Data 5
32 - Vcc

33 - ROM A0
34 - ROM A1
35 - ROM A10
36 - ROM A2
37 - ROM SELECT A1
38 - ROM A3
39 - ROM A4
40 - ROM A11
41 - ROM A5
42 - ROM A9
43 - ROM A6
44 - ROM A8
45 - ROM A7
46 - ROM A13
47 - ROM A13
48 - Gnd
49 - ROM A14
50 - ROM A15
51 - CLOCK (3.597Mhz)
52 - ?
53 - ?
54 - ?
55 - ROM SELECT A2 (Signal inverted on Super Contra by an LS04)
56 - Vcc
57 - Vcc
58 - CPUA0 (Signal inverted on Super Contra by an LS04)
59 - CPU A1
60 - CPU A2
61 - CPU A3
62 - ?
63 - /RESET
64 - Vcc

ROM SELECT signals are used by the 74LS138 on the ROM board of the Super Contra game to select one of 8 Sound ROMs

channelmaniac:
Model: Super Contra
Symptom: Garbled Audio

This one took a long time to track down. Replaced female socket connector between the CPU board and the ROM board. Tested.

channelmaniac:
Model: Teenage Mutant Ninja Turtles
Symptom: RAM Error

Replaced 1 SRAM, 1 74LS245, and 1 74LS32 IC. Tested.

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