Excellent !
Have you got a good replacement cap for C613?
If you have, insert it (take care of polarity) and re-measure the output voltage.
What do you get?
yeah, I installed it already and I get 0.04V at R627 leg that use to be lifted
Excellent !
Have you got a good replacement cap for C613?
If you have, insert it (take care of polarity) and re-measure the output voltage.
What do you get?
O.K
With volume at minimum measure the voltages ( 200mV DC range) on both legs of
R645, R647 and compare wit R646 and R648 of the other channel.
What do we get?
Rick,
Only at minimum volume please !
You have marked the resistors the wrong way !
For the left channel you have a single white resistor ,
Measure with both probes on R645 then both probes on R647 they should be both on that same resistor.
For the right channel you have the other single white resistor ,
Measure with both probes on R646 then both probes on R648 they should be both on that same resistor.
that is a total of 4 readings.
Rick ,
I would check again the center pin of the white resistors,
DCV(200mV range) relative to GND for both channels.
The left channel readings above are a bit un-equal.
What do you get?
Minimum volume=zero volume=no volume.
One more thing I forgot to say,
let the amp worm up for about 5 minutes before you take the readings.
At zero volume.
And after 5 minutes warm up.
Try trimming the left channel down closer to the right channel reading with VR601.
Then remeasure the R645,R647 voltage relative to R646,R648 voltages.
Is that the mid point voltage?
What about the "4 resistors" voltages?
Edit:
If these are the resistors voltages,your amp should play well now.
You can try it with music and speakers,at low volume first then crank it up.
That is nice to hear.
Our work here is done ...at last.
That is nice to hear.
Our work here is done ...at last.