BobbyN
Well-Known Member
Mark, I remember one time on an SX-1250 Q11 on the power amp board was "noisy" which caused protection problems but would test good with a DMM on diode test. Could he have something like this?ok, good.
What about the rest of the e-caps in the protect circuit? That was IMPORTANT!!!
And the vague term "clicks": listen and watch, and describe: (as an example: ONE click relay arm visually moves, but after click, relay arm is still off. 6 seconds later click happens again and repeats everything as described).
Here's an unusual test: Set your meter to measure CURRENT, 100mA or so, ground the black lead and connect the red probe to the collector of Q2, to pull in the relay and see if it CAN pull in and stay in, and also to read the hold current.
Set the DMM back to volts, ground the black lead, insulate all but the tiniest point of the tip of the red probe, then measure and post the voltages found on pins 1, 3, 4 5, 6, 7 & 8 of the pa3004 integrated circuit.
We have been assuming the IC is being fed properly - well it just got real and we gotta dump that assumption.
Bob