Spyridon
Well-known member
Sound stopped working today on my Robotron. Sound board had been recapped and everything was working fine. Today when I turned it on...nothing. Fuses are still good. Any thoughts on what to check first?
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Got to thinking about it and you could also pull the power connector for the sound board and test the voltage at the connector to see if the problem is in the harness or on the board.
I can try that but the harness is new. Some guy on these forums made it![]()
Test it anyway, I know that guy and he is kind of old.
Just to verify where the voltage is getting lost.
Also check the crystal oscillator on the board. I had one go bad.
Are you sure volume is totally gone? Have you tried cranking up the volume to verify?
reflow the headers on the sound board and retest the voltages
Got to thinking about it and you could also pull the power connector for the sound board and test the voltage at the connector to see if the problem is in the harness or on the board.
Are you getting the "William's Humm" on startup? If not, the amp may have crapped out. I have found these often go south after new caps have been installed.
These are notorious for crapping the sound ROM too. and a few other things out of the blue.
Try pressing the diagnostic switch on the sound board. It should play one of the sounds over and over again. Given the current state it may not, but if it does, then it will probably be in the interface section. It may take a session with a logic probe to sort it out.
The big 40 pin socketed chip...or as Dokert likes to call it...the CPU!
This was the problem with mine.
Are you referring to the socketed chip on the bottom left?
Maybe I can swap in the one from my Sinistar and see if that fixes it?
The big 40 pin socketed chip...or as Dokert likes to call it...the CPU!
This was the problem with mine.