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OK I dont know your skills so I will keep it easy.
If IC601 shorts R607 opens. The relay will still click.
You will get no B+ R607 is used as a fuse so use an
OEM part or a flameproof of same value.
IMPORTANT you must be sure there are no shorts on
CN641 1-2 If there is a short you will probably blow IC601
again. I would cut the wires and get the B+ up again first.
Usually Q502 shorts and may be caused by bad T503 flyback
or cold solder around T501. they also go for no reason sometimes.
See what you find and & get back to us BEFORE you hook wires back up.
Good luck 73 Zeno
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