[TechAssist] Re: Optimus STAV-3170 Stereo receiver - Blowsoutputs on one side only.
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 3 Mar 2005 12:04:30 -0700
I kinda suspected that,...but,...
He claims, and insists, his speakers are working OK on another unit.
I was surprized that it went out as soon as he hooked it up, cause it was
working, and running cool in my shop. Maybe I better take it back, and ohm
out his speakers before I hook it up this time.
Regards,
LLW
LeRoy Westlund
Westlund TV & Electronics
97 North Main " I forgot,..to remember,..
Centerfield, UT 84622-0087 to forget "
Ph./Fax 435-528-3822
mailto:LLW@xxxxxxxxxx
-----Original Message-----
From: Christopher Barnak <cbarnak@xxxxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Thursday, March 03, 2005 11:38 AM
Subject: [TechAssist] Re: Optimus STAV-3170 Stereo receiver - Blowsoutputs
on one side only.
>Beware, I had the same problem, and it turned out the customer
>had a bad speaker. Sounded good. But at a lower volume than the
>other. Turned out it had some shorted windings.
>
>
>
>Christopher Barnak, CET
>Norfolk Public Schools
>Electronics Maintenace
>966 Bellmore Ave.
>Norfolk, Va. 23504
>
>Phone 757 628 3385
>Fax 757 628 3392
>cbarnak@xxxxxxxxxxxxx
>
>
>>>> llw@xxxxxxxxxx 3/3/2005 11:55:53 AM >>>
>Hi members,
>I had repaired this unit by replacing the following parts, but it is
>back
>with the same problem:
>Q2 blown apart (2SC3281)
>Q4 shorted (2SA1302)
>Q512 open (2SC3298)
>R612 open (4.7 ohms)
>R614 open (4.7 ohms)
>D520 shorted (I used a 1N914)
>D522 shorted (I used a 1N914)
>
>I am wondering if there is a better replacement for D520, and D522,
>since
>the 1N914 is a bit longer, and not physically the same size. I can't
>read
>the number off the originals, cause they are too small.
>
>The only difference between this repeat failure of the outputs, and
>the
>first repair is that this time Q512 (the black 2SC3298) is bad. Last
>time
>Q514 (the green 2SA1306) was bad. I had replaced Q514 with a good
>generic,
>but the replacement was black in color, not green like the original.
>Also, this time it is D520, and D522 that is bad, not D524 and D526
>(which
>seem to be the same size diode). I am wondering if this might have
>thrown
>the outputs out of balance, and caused the repeat failure of the
>outputs.
>
>Any help is appreciated,
>LLW
>
>LeRoy Westlund
>Westlund TV & Electronics
>97 North Main " I forgot,..to remember,..
>Centerfield, UT 84622-0087 to forget "
>Ph./Fax 435-528-3822
>mailto:LLW@xxxxxxxxxx
>
>
>
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