DK: what did i cook and how?

mc300baud

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i just did some work on my DK in a DKjr cab. the two electrical-based things i did were:

- replaced the transistor at Q4 to eliminate garbage background noise and

- installed a standard dipole toggle on/off switch to replace the flaky one that didn't engage power half the time.

got everything put back together and it looked fine. the repair at Q4 seemed to be great. then i get a burning smell. couldn't see anything and it didn't last long so i thought maybe some dust or something that got moved around while i was working on the cab (i also painted over all the visible orange with Radarscope red and did some other sanding and random cabinet repair.) a few minutes later after playing a couple of games and walking away to grab a drink i come back to a white screen. no noise, no coin-up, nothing.

so i probably burned something... no power to the PCB. the board looks fine and i doubt the trouble is there.

i know the original toggle switches for Nintendo cabinets have some line filter stuff on them and on earlier advice that it wasn't necessary i did not replace this when i put in the new toggle switch. could the lack of this stuff have cooked the power supply? is there something else that is likely to have gone bad?
 
it's a 120V 15A/250V 10A like the original.

i opened the original PS and the fuse tests fine. i don't have any 4A mini fuses sitting around so i couldn't put in a new one to verify that it isn't just testing good when it's not.

since this machine is headed out on location tomorrow i dumped the original PS and threw in a switcher and line filter. it's all up and running again just fine, though i feel a bit bad about removing the original PS. i'm going to see if Dokert wants to spend some time with it, see if it's salvageable.

although really, it's a frankenstein machine anyway so i shouldn't feel bad about losing the original PS. DK in a DKjr with a Popeye harness... heh. at least it's now Radarscope red and looks pretty nice.
 
i just did some work on my DK in a DKjr cab. the two electrical-based things i did were:

- replaced the transistor at Q4 to eliminate garbage background noise and

- installed a standard dipole toggle on/off switch to replace the flaky one that didn't engage power half the time.

got everything put back together and it looked fine. the repair at Q4 seemed to be great. then i get a burning smell. couldn't see anything and it didn't last long so i thought maybe some dust or something that got moved around while i was working on the cab (i also painted over all the visible orange with Radarscope red and did some other sanding and random cabinet repair.) a few minutes later after playing a couple of games and walking away to grab a drink i come back to a white screen. no noise, no coin-up, nothing.

so i probably burned something... no power to the PCB. the board looks fine and i doubt the trouble is there.

i know the original toggle switches for Nintendo cabinets have some line filter stuff on them and on earlier advice that it wasn't necessary i did not replace this when i put in the new toggle switch. could the lack of this stuff have cooked the power supply? is there something else that is likely to have gone bad?

Check your work, you may have shorted something out, which could cause extra stress on the PS and burn something out.
 
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