The clock comes from pin 10 of the LS139 at 5F. When I got to the LS237 at 6J, it was dead. Solution: 74LS02 at 1C on the CLK board at 1CĪll sprites were missing, the I finally traced from that data linesīack to see where a chip had died. I noticed that if I shorted pins 2 and 3 on the LS02, the picture would semi-straighten Looking at the schematics, there is a 74LS02 connected to the VBLK/CMPBLK outputs. Problem: TKG3 board set - Board will not sync Solution: Replaced bad MC10125 at 1H on the Video board. The ladderĪt the beginning would move up and when Kong pounded on the girders they wouldīreak, but Kong, Mario, the barrels and everything else that moved was missing There were NO moving sprites on this board at all. Solution: replace bad EPROM at 3F on the CPU board. Make a long story short, I finally changed the sound EPROM at 3F and thatįixed the problem, Kong is now grinning away and you can hear him again. I don't know what else to call this sound, but after KongĬlimbs the girders and stomps on them to break them all, he grins and you Solution: replace bad electrolytic capacitor and reflow the solder joints I replaced the cap and reflowed the solder on the other electrolyticĬapacitors and re-installed the board. Looking closerĪt the board I bent back the electrolytic capacitor at C387 and the leg came off Swapped the board with another one and the hum disappeared. The Sanyo monitor has a small audio amplifier board on it, I Problem: loud hum sound at all volume levels Solution: reflow the solder on the caps in the sound circuit.
Then reheated the solder on all theĬaps and transistors around the area of C22 and the ones around two cap, as it was corroded leg was falling off, Jumps on and breaks the girders in the introduction and no sound whenįirst, I cleaned and re-seated all the eproms and the 8039, no change.
#Donkeykong audio archive
Donkey Kong PCB (logic board) repair logsĬoin-op Video Arcade Technical Information Archive
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