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.

Gary


> On Oct 1, 2017, at 8:41 PM, thoyer via Collins <collins@xxxxxxxxxxxxx> wrote:
> 
> 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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