Electronic component restocking

A fudge load of capacitors and semiconductors that I have been waiting on for some repairs

Paperboy Fixed

So I found 3 corroded sockets on the CPU board and replaced those, but that made no difference. On the test bench I found a buffer that was randomly glitching between the main and sound cpu. I replaced that and it works :)

Repairing Paperboy

Lets see if I can get this cpu board working again

Champ Sprint Finished

All working now :)

Champ Sprint player 2 steering

Replaced the bad opto and player 2 now has steering. Just the player 2 accellerator to go

Champ Sprint PCBs done :)

Found and replaced two iffy EPROM sockets and the corrupt graphics on the highscores are gone. Player 1 iis full working, but I need to sort out the pot and optos on player 2 now. Finally I can play Champ Sprint at last

Champ Sprint - almost

Replaced buffers going to the colour rams that had static outputs. Now the title screen and game look great, but the highscore and workshop screens are corrupt, so possibly has some bad roms or bad adress selects. Happy to have this much progress at last

Champ Sprint progress

So replacing the colour drive transistors helped. The missing red colour is now back. I also found and replaced a bad RAM in the video circuits. Now I have a screen that is mostly white, looks like there must be something stuck high in the colour circuits. I only wish the PCB set was not so massive and hard to work on.

Champ Sprint progress

The output drive transistors on the Champ Sprint gave inconsistant readings between them so I replaced them all

Champ Sprint in progress

So the newly installed Franken-monitor is a big improvement over the previous monitor, but it is now clear that the PCB is not outputting any red, so time to pull the video board out