Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

 
 
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alllw
 
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Default Sony kv20v80 PS Problem?

Hi all, I have a 1998 Sony kv20v80 in shutdown with 2 blinks on the
standby led. I think that means the PS section area. I am working off
of a Sam's #4134 schematic.

Measured the 115v, 12v, and standby 5v sources and these are ok. The
9v source off of Q605 9v reg goes to 4v before shutdown. As is the 5v
source off of Q650 reg, fed from the 9v source. Measured the
resistance at the 9v TP to ground and it read 3.5 ohms. Don't know if
that's normal or not.

Q502 HOT is a 2sc5426 with internal damper. Seems to check out ok
except I do get a reading of 43 in ohms function B to E and 4.3 in
diode check function. Reversing the leads gives the same #s. Not sure
if the Hot has an internal resistor.

Anyone with pointers on what I should be looking at next or have fixes
on similar models.

Thanks , Al

 
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