Beomaster 8000 Repair Procdures
This page discusses a number of issues that had to be repaired in a number of Beomaster 8000 units that came across beolover's work bench. Common restoration procedures are described here.
Overheating and Failed Main Fuse
Overheating, shut down, failing main fuse and/or smoke from the cooling 'tower' are usually related to a failure of the quiescent current trimmers in one or both output amplifiers of the Beomaster 8000. A replacement of the output transistors becomes frequently necessary.
Erratic behavior like sudden stand-by, large number of display segments out of a sudden missing, and many 'intermittent' control issues are related to bad contacts and a few notorious printed circuit board issues on the Beomaster 8000 processor board.
Volume Control Issues:
The Beomaster 8000 relies on digital attenuators for volume control. Loss of volume control, or uneven volumes on both channels often has to do with one of the attenuators needing replacement, or with bad contacts to their control pins.
Tuner Not Tuning:
If the tuner does not respond to the set frequency or behaves erratically, then an issue in the frequency feedback channel may be the issue.
Rotary Encoder Issues
The Beomaster 8000 uses rotary encoders to convey user changes of volume or FM frequency to the microcontrollers. These encoders can fail mechanically and electronically.
Broken Indicator Lamps
The Beomaster 8000 uses standard incandescent lightbulbs as indicator lights. Frequently these burn out, or get damaged due to vibrations. There are two ways to repair this issue: Order original replacements from Denmark, or use modern LEDs for replacement.