Re: {Collins} 51S-1 PTO Issues

When I measure between pins (wires) 2 and 4 of T501 I read an open. Pins 1
and 3 read 0.2 ohms.

The way T501 is drawn on the schematic, I don't expect it to read open
between 2 and 4.  

-----Original Message-----
From: Dukes HiFi [mailto:dukeshifi@xxxxxxxxxxx] 
Sent: Sunday, October 01, 2017 9:50 PM
To: thoyer
Cc: collins@xxxxxxxxxxxxx
Subject: Re: {Collins} 51S-1 PTO Issues

What makes you think T501 is bad?

The resistor issues you mention are common failures but the coil is not.


> On Oct 1, 2017, at 8:41 PM, thoyer via Collins <collins@xxxxxxxxxxxxx>
> Working on bringing SN 131 back to life. Found PTO not PTO-ing.........
> External to the PTO someone at one time replaced R62 with a 100 ohm 
> resistor, schematic calls for 1k. So far this is the only area of 
> rework I have found.
> Resistance measurements on V15 pins 5 and 6 were not making sense. 
> Pulled PTO out and found R504 was fried and R503 measured 77k - should 
> be closer to 56k.
> Measuring between pins 1 and 4 of T503 shows 33m - basically open. 
> Caps C507 and C508 are not shorted.
> Bottom line, I can replace all of the parts to bring things back in 
> spec BUT, what about T501? Anyone know of a source for these?
> Thanks,
> Tom
> W3TA
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