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Old 01-09-2018, 14:44  Translate from English to Italian  Translate from English to French  Translate from English to German  Translate from English to Spanish  Translate from English to Dutch  Translate from English to Greek  Translate from English to Portuguese  Translate from English to Russian  Translate from English to Russian
macplaxton macplaxton is offline
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Default Relook 400s power supply

Hi all,

I'm trying to fix the power supply on my 400s. It is a DG-50 REV A 2005-11-17.

Can anyone tell me the value of R28(?) and the voltage of zener ZD3?


IMG_20180830_155159 by macplaxton, on Flickr

Also, after removing ZD4 from the board to read the numbers, I noticed it was installed in reverse to the printing on the board. Anyway, I've check the capacitors and C71 and C23 were bad and I've replaced a few others as a precaution as I had spares.


IMG_20180814_145417_1CS by macplaxton, on Flickr


Relook 400s power to VFD filaments by macplaxton, on Flickr

It seems that pins 1 and 2 of the 15-way connector and +FL and -FL for the vacuum fluorescent display filaments.

Thank you.
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