Author Topic: Suddenly I have very low audio  (Read 229 times)

Offline Pinwizkid

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Suddenly I have very low audio
« on: May 29, 2017, 12:30:08 pm »
Turned on the X68000 today to discover I have very low audio coming out of every audio output in the machine (including the RGB video cable into the monitor). I don't believe my machine was ever capped but luckily there is no leakage yet. I noticed cold solder on the volume pot and reflowed it, but that didn't change anything. I read that it could be amp chips and while I have some experience replacing pcb components, I'm afraid doing ICs is a bit out of my league.

Is there anyone in the US that would be willing to recap my IO board and repair the audio? Of course I will pay for your time. I just don't have the time to dive deep into this at the moment and I was planning on bringing the machine to a gaming expo this summer. Thanks!
« Last Edit: May 29, 2017, 12:34:07 pm by Pinwizkid »

Offline Pinwizkid

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Re: Suddenly I have very low audio
« Reply #1 on: May 31, 2017, 10:29:36 am »
As with most things X68000, the best solution is to just put on your big boy pants and do it yourself. I'm gonna recap the IO board and see where that gets me. For reference, I've typed up a list of all the caps on the Super HD IO board in case anyone needs it or if someone wants to add it to the wiki:

List in capacitor # order:

C201 4.7uF 50V
C202 4.7uF 50V
C203 4.7uF 50V
C204 4.7uF 50V
C207 4.7uF 50V
C208 47uF 16V
C209 100uF 16V
C210 100uF 6.3V
C211 100uF 16V
C212 100uF 6.3V
C217 22uF 16V
C218 1uF 50V
C224 100uF 6.3V
C225 10uF 16V
C226 4.7uF 50V
C227 100uF 16V
C230 4.7uF 50V
C231 0.47uF 50V
C232 0.47uF 50V
C233 1uF 50V
C234 100uF 10V
C235 100uF 16V
C236 0.47uF 50V
C237 100uF 6.3V
C238 100uF 6.3V
C242 100uF 16V
C243 100uF 10V
C247 0.47uF 50V
C249 100uF 6.3V
C252 47uF 16V
C253 47uF 16V
C258 1uF 50V
C259 100uF 16V
C260 4.7uF 50V
C261 100uF 10V
C264 0.47uF 50V

List in capacitor rating order:

0.47uF 50V C231
0.47uF 50V C232
0.47uF 50V C236
0.47uF 50V C247
0.47uF 50V C264
100uF 10V C234
100uF 10V C243
100uF 10V C261
100uF 16V C209
100uF 16V C211
100uF 16V C227
100uF 16V C235
100uF 16V C242
100uF 16V C259
100uF 6.3V C210
100uF 6.3V C212
100uF 6.3V C224
100uF 6.3V C237
100uF 6.3V C238
100uF 6.3V C249
10uF 16V C225
1uF 50V C218
1uF 50V C233
1uF 50V C258
22uF 16V C217
4.7uF 50V C201
4.7uF 50V C202
4.7uF 50V C203
4.7uF 50V C204
4.7uF 50V C207
4.7uF 50V C226
4.7uF 50V C230
4.7uF 50V C260
47uF 16V C208
47uF 16V C252
47uF 16V C253
« Last Edit: June 11, 2017, 03:20:48 am by Pinwizkid »

Offline Pinwizkid

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Re: Suddenly I have very low audio
« Reply #2 on: June 14, 2017, 12:16:37 am »


I recapped the entire bottom board (HUGE thanks to BlueBMW for lending me his desoldering gun!) Sadly, I STILL had low audio. Turns out it was the power connector going into the board. I had to fight with it to get it to sit right, but it's working again. I'd like to replace this connector but can't seem to find the pins that Sharp used. Does anyone know what size/type pins these are? They remind me of the pins found on early Nintendo arcade games, but are definitely larger.

Well, at least the board is recapped now!
« Last Edit: June 14, 2017, 12:23:06 am by Pinwizkid »