Beocord 9000 No Output

[jacope]

Hi all,

Just acquired a BC9000. Shockingly, all mechanical aspects are working great. Planning on recapping but waiting on a few to arrive. Just did a full restore of an 8002 so I’m reasonably familiar with what I’m looking at.

As of now, I have no output through headphone or DIN, for playback OR record.

I can trace my record/PB signals through to 2IC101/201, pin 1 for record, pin 4 for playback, but I don’t see the signal exiting the IC at any pins – I’m also having trouble understanding the schematic for those ICs. Recording output I believe should be pin 14, but where does playback output?

Could be faulty Dolby chips but I want to see some other opinions before committing to that idea.

My B&O Icons:

[jacope]

For those having similar issues:

My unit has the earlier PCB2 design (serial 2887011).

I highly recommend replacing most if not all electrolytic caps, especially with the BC9000 and its complicated circuitry.

In my case, 2C108 (right) and 2C208 (left) were about 50% out of spec. These have something to do with how the Dolby chips switch between record and playback.
Replacing these immediately restored output signal on pin 14 on the Dolby chips.

My B&O Icons:

[Author]

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