Power on right channel not quite right. Need suggestions

[last lemming]

Well, I ordered most the parts to replace the board (just in case), because I pulled the two LEDs that wouldn’t light and bench tested them. Guess what, they both worked.

[last lemming]

in retesting my outputs and inputs I couldn’t get a stable reading on the output center pin, it kept going into the negative readings.

Also which side is conductive on a PCB. In trying to remove QC2 I nicked the eyelet on the top side pulling away a piece of the eye so it wasn’t a complete circle anymore. The bottom of the eye is fine and the trace on top going to the eye is still intact. Is this still serviceable?

[last lemming]

Ok. I’m about to give up. I’m about to give up!!!

I replaced many of the components on the audio board out of frustration and I double checked EVERY connection solder and where they are supposed to run to and from and I see NOTHING wrong. Yet no none of the LEDs in the audio board on the right channel light at all.

I’m stumped. My last readings on the audio board are:

IA = 216V
IB = 210V
OA = 214V
OB = 158V
OC = 7V
OD = 95V
OKA = 15V
OKB = 97V
OKC = .6V
OKD = 1.63V

[Paul Birkeland]

The 0.6V at OKC would have me wonder if there's a solder bridge on the 2N2222 pins that have turned it into a diode.

[last lemming]

No solder bridge. Looked under a 10x loop.

I ran a resistance check on all the component

[Paul Birkeland]

We can set you up with a flat rate repair if necessary. 

The 7V at OC is a really bad sign.  That would basically mean no current is flowing through the 6922 half on that channel.  The 0.6V would be typical base emitter voltage which makes me wonder what's going on with the servo on that side.  PJ might have some good ideas here.

[last lemming]

I’ll pack up the unit and send it to you.  I’ll call about the rate Monday.

Thanks.

[last lemming]

Package sent to ya!

[Paul Birkeland]

We will not accept kits sent in your packing materials.  We have to send you the materials to do this.   You need to call about the service on Monday.

[last lemming]

Oh crap. Did not know that. I dropped it off at the UPS already. I’ll need to go pick it up

[last lemming]

Ok. Got the package back. I’ll call Monday.

[Paul Birkeland]

Thank you so much.  We used to allow people to send their own amps in, but the failure rate from poor packaging was over 90%, so we now send instructions and a proper box.

-PB