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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...

Monday, February 16, 2015

Beomaster 8000: Display Repair (I) - Cleanup of Botched Frequency Display

Before going further with this Beomaster 8000, I wanted to make sure that the frequency display would be salvageable. So I took the displays out today and had a look:

Display PCB (#9) after removal from the Beomaster:


Displays removed:


Here a picture of the frequency display after I opened it up. A beautifully messed up SMD soldering job! A true expert was at work! (actually, I have to admit this does remind me of my first attempts...;-). Unfortunately, I damaged a couple traces when I cut the glue off that Mr. Amateur used to put the display back together:


My rework station made it an easy job to clean this mess up. I also soldered small copper braid snippets into place where I damaged the traces. So, I am confident that this display can be rebuilt:


Upon further inspection of PCB #9 it became apparent that Mr. Amateur also tampered with the current limiting resistors since he probably noticed that his display was a bit too bright. Here a couple pictures of his work:


Shudder - What a mess!:


He should have practiced a bit before getting into this! I ordered a few proper 68 Ohm resistors from Newark to replace his 100 Ohm values. Soon this will all be back to normal (except a few minor scars...;-).






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