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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...

Thursday, October 22, 2015

Beomaster 8000: Rebuilding the Power Supply Board

After replacing the original main reservoir capacitors of the Beomaster 8000 that I am restoring right now it was time to do the remaining power supply. The golden reservoir capacitors often fail at this age. Another often found dead capacitor is the 5V rail cap, since it is directly mounted on the 5V regulator (on the heat sink on the right side of the Beomaster enclosure), and therefore sees elevated temperatures. Here is a photo of the original power supply board:

and after replacing all the electrolytic capacitors with quality 105C grade Japanese units:

Before putting the assembly back into the Beomaster I also cleaned and reflowed all headers, and coated the pins with DeoxIT D100 for lasting oxidation protection. On to rebuilding the remaining boards...

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