Film-Tech Forum ARCHIVE: Strong 62-80005R power supply mainborad problem

This is topic Strong 62-80005R power supply mainborad problem in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=010302

Posted by Marin Zorica (Member # 1716) on 02-02-2010, 06:57 PM:

I have one of this, and problem was that small rectifier which is consisted from transformer and two diode stabilizer was dead, stabilizer NPN darlington was dead because of one shorted tantal cap....both were replaced and when I powered it again it was working, 150V no load, after half of minute or so, voltage begin to fall down....when I powered it again it was as before, no power on output, even contactor is working, DC voltage to mainboard is 310V DC and so....

But now when is no working I did mesured that voltage that powers IC's on mainboard is 7V DC, as I don't have schematic of mainbord can anybody confirm me this is wright value, or it should be higher? Also, now I found when measuring resistance between GND and Vcc of is'c that I have only 10OHm.....that's kind low I think? When cap was dead it was 0, but now is 10...maybe some other cap is dead too...

If anybody can provide me schematic of main board it would be great, or give me some tips about voltages there.

Will pull out mainboard again and start to search...