[TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 15 Jul 2005 14:59:19 -0400
Aside of plugging it into the variac at your shop, what happens when you
plug it directly into a normal outlet at your shop? Do it still short the
regulator or does this only happen at the customer's home?
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxx
----- Original Message -----
From: "Larry E" <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 15, 2005 2:50 PM
Subject: [TechAssist] Sony RA-2A KP-46C65 instantly blows IC601 & R608
Hi Guys, My week for headache sets, this Sony RA-2A covers the following
models
KP41T65, 46C65, 48S65, 53S65, & 61S65, went to customers house and all pins
of IC601 (MX0841AB-F) were shorted to each other, also R608 the .1 1/2w
fusible resistor was open, pulled all of the little blue caps around IC601
and checked
them on the sencore, all ok. I ordered a new IC & resistor, installed them
and when
I powered up the set they instantly blew, pulled set to shop, re-installed
new chip
& resistor, plugged into variac & brought up slowly, set started and worked
fine, heres
the fun part, I brought the set back to the customer hooked it up and all I
get is a
constant blink of the led, of course IC601 & R608 were blown again,
Obviously my
Sencore variac being an isolation transformer let the set run but
connectiong to the
customers AC outlet lets the parts short, I have pulled every cap in the
"hot" side
of this power supply and found no shorted caps, checked the 2.2 meg resistor
R601, there is no continuity between hot & cold ground, customer told me
second
time out that they had lightning problems 2 days before set went down but I
see
no arcs etc on board, main fuse was not blown, HOT circuit good, seems to me
it
has to be hot & cold ground connected somewhere???
please help if you can, I`m pulling hair out at this point, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
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