Check the ref. voltages and capacitors 4C1 (10uF) and 2C3 (220uF)

Martin

Thanks Martin..Both the caps seem to be ok. I replaced them anyways

No change in issues.

Martin..I see 7.2v on pin 5 of IC101 and IC201.

On closer look I found C2 on the PCB 2 was 470uf but the service manual shows it as 100uf ?

Thanks.

Check that the Dolby circuit board is connected properly under the main board.
Check the record/playback relay contacts (or replace the relay).
Check the 14VA and -15V supplies to the audio line amplifiers.
Check the ground connections to the tapeheads.

Martin

Thanks for your guidance Martin. I'll check the items you have listed.

Also should I leave the 470uf cap or replace with 100uf ?

470uF is fine.

Martin

Martin...weird one...the beocord seems to be erasing the tapes when I play them 😕. I tried the tape I am using on the defective player on a BC9500 and found its erased. I can hear some music at very high volume but its faint.

I am 100% sure I have not pressed the record button at any point. Put another old tape and same fate.

Does that point to a specific component failure ?

Thanks !!

Removed the Relay and tested with 3v. Seems to be working fine. Have ordered another one that should show up later this week. But relay doesn't seem to be the issue.

Check that the Dolby circuit board is connected properly under the main board - Took out and reconnected multiple times. Looks ok.
Check the 14VA and -15V supplies to the audio line amplifiers. - All voltages as per schematic check ok.
Check the ground connections to the tapeheads. - Verified.

I finally did get some time to work on this.

I have another Beocord 5000 and I compared the two units and confirmed the following -

1. I swapped the PCB 2 from bad unit to good unit and the good unit worked fine. So PCB2 is not an issue.

2. On the bad unit the E of TR112 is reading 3.7V and the good unit is about 40mv.

Any next steps ?