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Beolover SyncDrive: DC Platter Motor Replacement for Beogram 4002 and 4004 (Type 551x and 552x)

Late Beogram 4002 and the 4004 (Types 551x and 552x), which have DC platter motors instead of the earlier synchronous AC motors usually suff...

Tuesday, April 24, 2018

Beomaster 8000: Power Test Update

The +15V regulator is now functioning correctly on this Beomaster.






















The next thing to do is recheck the no-load current and the DC offset adjustments again.






















































I did both channels and no problems with those adjustments. I didn't expect any since I had already tested these output amplifiers by themselves earlier.

I usually do a first listening test using the Beomaster TP2 source once I am confident the amplifiers are ready. This unit fired up and played just as beautifully as I expected.






















I performed the same check on TP1 and it played great too.

After an initial scare where the FM tuner wasn't producing any sound, it turned out the problem was only a faulty connector not making contact. I fixed that and the FM tuner also works great. The signal meter and tuning display indicate the FM board is picking up stations.





















A good second test overall. The power supply tests all pass now and I was able to successfully recheck the output amplifier settings. Best of all I got to hear a nice preview of this Beomaster playing music again.

The next steps are the obvious display segment repair and I will do the preventative update of the microcomputer oscillators.








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