I'm restoring a William's Moon Patrol for a friend I decided to buy a used power supply board and heat sink off of ebay. The originals had terrible burn marks on the power connectors and a technician had run jumper wires to bypass the damage. Also, the power board had corrosion around the pins for the ICs.
The power supply board and heat sink from ebay looked much better and the connectors were very clean, so I went ahead did a recap on the power board, but I left the heat sink as-is.
Now, when I hooked everything up, the game came up and you could play it but there was no sound. LEDs #2 and #3 were lit but #1 was off. Soon after, the power supply board blew fuse #5.
My first question is about the heat sinks. The heat sinks look identical in every way, but the bottle-cap transistors have different numbers and I'm wondering if this is part of the problem.
Transistors in original Moon Patrol heat sink:
8127
2N6057
8252
2N3055
Transistors in heat sink from ebay:
5162-09
425-00
8226
9552-00
8226
If anyone has insight into this, that would be awesome.