Vintage Synth Repair

This is misleading very few transformers have built in thermal fuses!

 

Regards

Brian G3OYU

 

From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of HAL9000
Sent: 01 June 2011 8:21
To: vintagesynthrepair@yahoogroups.com
Subject: Re: [vintagesynthrepair] Re: Crumart Trilogy replacement power
transformer

 

  

 

I check the transformer's primary using a self-made (lopt) inductance tester
running at 19KHz. The primary could have shorted turns due to overheating
etc., althought usually there is a thermal fuse incorporated inside the
transformer as protection that goes o/c. If it blows the main fuse (verify
if this is correct) with the secondary disconnected then it is surely bad.

 

H9000

 

  

The psu board could be faulty but I haven't even got that far. Right now
just having the transformer connected to the and power switch (with the rest
of the synth disconnected) still blows the fuse. The primary checked out.
The secondary show something like 3.5 megaohms. That was it. There may very
well be more damage further on but as I said, I haven't got that far yet.