Peter Chou SMPS needs Jumpstart

jurtaman

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Anyone familiar with the one IC version of this PSU?
Seems dead. 7500 chip has no power on pin 12.
If I "jumpstart" it with like 10VDC on pin 12 while hooked up to normal wall power it works.
I dont need to keep the power applied, just quick tap to start it.
I get all my -5V, 5V with adjustment, and 12V levels afterwards.
How do I get this thing to start on its own? Only schematics I can find is for the 2 IC version, which is very similar.

Peter Chou Model: UK9-2A1

Id rather replace a $2 part than get a new supply if possible. Thanks!
 

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Sorry everyone.. I didn't dig deep enough!
R6 was open.. looked ok in circuit. Fix was here all along!

 
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