Beocord 8004

29th July 2009

This recorder worked normally except that the motor continued to run even in standby mode. The motor is powered from the switched -15V supply and this was present all the time, however the switched +15V supply, which is controlled by the same circuit, behaved correctly. The cause of the fault was 4TR9 (BC547B) which had a base to collector leak. It is important to resolve faults like this and avoid needless wear as the motors used in these models are expensive and difficult to obtain. A similar circuit is used in all the Beocord 6000, 6002, 8000, 8002 and 9000. [Beocord 8004]