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 Forum index » DIY Hardware and Software » The Repair Shop
Waldorf Microwave Rev.A problem
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gregcomposition



Joined: Oct 20, 2013
Posts: 16
Location: Poland

PostPosted: Thu Feb 22, 2018 5:35 pm    Post subject: Waldorf Microwave Rev.A problem Reply with quote  Mark this post and the followings unread

Hi everyone!
I've got a problem with fixing the Waldorf Microwave. I bought it after a shortcut state. I repaired its power section by replacing electrolyte capacitors, positive power regulators, diodes and tantalum capacitors. I was using a service manual for Revision B (despite the differences):
Posted Image, might have been reduced in size. Click Image to view fullscreen..

Now the all voltages (+12,+8,+5,-5, -12V) are ok, but the synth doesn't power up properly (a display hangs on the "welcome" message and its blinking). Service mode is not accessible.
Later I saw somewhere in the net the image of power section's tantalum:

Posted Image, might have been reduced in size. Click Image to view fullscreen..

The second one counting from the top (connected between +8V and ground) looks like it was in reverse position (hot leg to ground). It seems to me not logical, but I've changed polarization of this tantalum and... synth turns on, works for a few seconds and then... the tantalum was fired.Does any Microwave owner would confirm position of this tantalum? Any help with a repair or service manual of revision A? I will be grateful.
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gregcomposition



Joined: Oct 20, 2013
Posts: 16
Location: Poland

PostPosted: Wed Jul 17, 2019 10:41 am    Post subject: Reply with quote  Mark this post and the followings unread

Solved.
If anyone is curious, the reason was a faulty power regulator +5V.
Thank you God for the brand new DOA parts...
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