Model: Triple Punch
Symptom: In pieces
Installed a missing 8255 PIO chip, replaced a cut resistor, cleaned dirty pins on the daughterboard, and tested. Monitor flickered and speaker buzzed. Checked pinout of the adapter vs. the pinout on KLOV and it was correct. Traced the sync line backwards to find it lead to the audio amp chip - the pinout on KLOV is incorrect. Traced the video outputs, repinned the adapter, and tested.
Incorrect pinout on KLOV:
Solder Side | Parts Side
+5 | A | 1 | +5
+5 | B | 2 | +5
| C | 3 |
1P Left | D | 4 |
1P Right | E | 5 |
1P Up | F | 6 |
1P Down | H | 7 |
1P Punch | J | 8 |
| K | 9 |
Coin 2 | L | 10| Start 2
Coin 1 | M | 11| Start 1
Green | N | 12|
Red | P | 13|
Blue | R | 14|
CSync | S | 15| Speaker (+)
+12 | T | 16| +12
GND | U | 17| GND
GND | V | 18| GND
Correct pinout:
Solder Side | Parts Side
+5 | A | 1 | +5
+5 | B | 2 | +5
| C | 3 |
1P Right | D | 4 |
1P Left | E | 5 |
1P Up | F | 6 |
1P Down | H | 7 |
1P Punch | J | 8 |
| K | 9 |
Coin 2 | L | 10| Start 2
Coin 1 | M | 11| Start 1
| N | 12| Green
| P | 13| Red
| R | 14| Blue
Speaker (+) | S | 15| Csync
+12 | T | 16| +12
GND | U | 17| GND
GND | V | 18| GND