[TechAssist] Re: Optimus STAV-3170 Stereo receiver - Blowsoutputs on one side only.
- From: "danny williams" <wizhd@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 3 Mar 2005 15:41:30 -0600
At my shop if customer won't bring speakers to test, there will be no
warranty!!!
Dan W
----- Original Message -----
From: "LeRoy Westlund" <llw@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 03, 2005 1:04 PM
Subject: [TechAssist] Re: Optimus STAV-3170 Stereo receiver - Blowsoutputs
on one side only.
>
> 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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