Beomaster 8000

9th January 2011

Faults in the FM tuner section can normally be resolved by linking across each pin of 2P6 and 2P7 (the two connectors that join PCBs 1 and 2) with short lengths of stiff wire. In one case the fault, a normal display but no control over the actual tuning with stations coming and going by themselves, was not cleared by adding these links, instead 9IC5 (U264B) inside the microcomputer can was found to be defective.

The reliability of the microcomputer system of this model can be improved by adding a 100nF ceramic capacitor directly across pins 1 and 2 of 6IC4 (7805) and ensuring that the voltage on pin 3 is as close as possible to the correct figure of 5V. Replace 6IC4 if it is not. [Beomaster 8000]