[TechAssist] Re: Optimus STAV-3170 Stereo receiver - Blows outputs on one side only.
- From: "danny williams" <wizhd@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 3 Mar 2005 11:12:23 -0600
LeRoy, Sounds like u are going to need to replace all of the preamp driver
xistors to insure a lasting repair. Re-replace all output and preamp xistors
on that channel and check diodes and caps as well. Use original xistor #'s
if possible.
Dan W @ Wizard Electronics
----- Original Message -----
From: "LeRoy Westlund" <llw@xxxxxxxxxx>
To: "TechAssist" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 03, 2005 10:55 AM
Subject: [TechAssist] Optimus STAV-3170 Stereo receiver - Blows outputs on
one side only.
>
> 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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