After 40 years faithful service the phono input has stopped working - is it repairable?
Do you mean the phono amplifier section? It should be repairable, even if it uses ICs or transistors that are hard to find. Could be the power supply to the phono amp.
Thanks. Yes, that's what I mean. When I took the top off it was hard to see anything amiss. I guess it needs someone who understands the manual diagrams eg can locate the power supply to the phono amp. It's been suggested an alternative would be to get a turntable with a pre-amp.
Since you have lost both channels of only the phono pre-amp, I would first suspect you don't have power to it; there should be 13.5 volts at pin 17 on the pre-amp board. If that is missing there is probably a problem with the regulator, which is QM20 (2Sb595) or any of the parts in that circuit, like a zener diode or possibly a shorted capacitor (which could be on the pre-amp board).
Design and Content © HiFi Engine 2006-2016
FAQ | Site Policy