Beomaster 6000

20th August 2008

No output from the right channel on either set of loudspeaker sockets was reported. Audio signals were present at the input of the power amplifier but the output transistors and their emitter resistors were OK. Careful measurements revealed that transistor TR107 (BF423) was open circuit, fortunately this had not caused any further damage in what can be a very fragile circuit. While the power amplifier was on the bench new pre-set potentiometers were also fitted and set up as per the manual, this can help make the set more reliable. [Beomaster 6000]