Description
Beomaster 4000 Repair:
BeoMaster 4000 repair. A Bang & Olufsen creation.
Fault:
- She doesn’t power up and blows an internal fuse.
Diagnosis
- Having been sat in an unfriendly environment for many years she is very poorly.
- The main capacitors serving the power supply and speakers have started to spill their insides.
- The insides are full of dust contamination and most screws heads have turned to rust.
- The main power rectifier was also dead.
- The trimmer potentiometers were malfunctioning.
- The front faders were very noisy.
- The signal strength indicator lights were not working.
- The signal strength meter light was not working.
- The power on light was dead.
Works Done:
- Too much to list really.
- The whole power delivery train was replaced
- All faults eventually repaired.
Not a single wire to board connector in sight, and removing any part seems to require almost total disassembly of the entire unit. These may be thin compact units but working on them is not in any way simple.
We got there in the end. Gave it a good clean inside and outside as well.
