Pinbot doesn't boot. Looks like 12v rail is slightly under. -12v rail at -14v and the 5v rail on TP2 on the cpu board at 9v! Can hear an ac hum on the speakers.
Bridge rectifiers shot? What would cause a high 5v rail? Dead resistor?
Thanks,
Brad
Pinbot doesn't boot. Looks like 12v rail is slightly under. -12v rail at -14v and the 5v rail on TP2 on the cpu board at 9v! Can hear an ac hum on the speakers.
Bridge rectifiers shot? What would cause a high 5v rail? Dead resistor?
Thanks,
Brad
Most likely, shorted main transistor Q5 or bad regulator chip IC1 on power supply board.
I'm afraid the 9V has done some damage on the 5V logic
Quoted from Tuukka:Most likely, shorted main transistor Q5 or bad regulator chip IC1 on power supply board.
I'm afraid the 9V has done some damage on the 5V logic
Yeah, was fearing that. Just have to work through it.
Any tips on testing IC1? Or is it a common.part so just replace?
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