can someone help with an MC-202 tech question?

[ripe909]

Hey all,

I am working on a 202 which is somewhat x0x-ish... and hoped someone could help with mapping some voltages in the power supply.

Specifically I am looking at the voltages around Q6 and Q7 when the 202 is powered on (and not in power save mode). I am expecting the collector of Q7 to be +9V (or close to it with an regulated supply, around 12v) with the emitter and base at +9V also (and with power save off at Q6) but I'm not getting anything...

I've tried replacing Q7 twice with the same results.

Any help is appreciated:



cheers
ripe

[guest]

whats the voltage on the other side of r40

q6 is a switch to turn on the powersupply
and either its bad
or its not getting the turn on signal

[ripe909]

Thanks for the reply. It looks like it is the turn on voltage for the transistor. A Zener diode was failing and causing the digital power supply to fail, which in turn would not turn on the analog supply.

cheers
ripe