[TechAssist] Re: Techwood stereo audio amp. Model # MD65 No sound (need schematic)
- From: "William Ed Miller" <prototech@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 21 Mar 2002 14:45:10 -0500
It's been a while since I worked on a Techwood
(http://www.weltonusa.com) but I know these ICs fail from time to
time.
I would also look at the electrolytics and active parts
associated with the IC. Could be a leaky electrolytic (or bad
ESR) or a leaky tranny or diode in the area.
Good luck,
William E. Miller, ASEET
-----Original Message-----
From: Bill S <billans@xxxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Thursday, March 21, 2002 1:32 PM
Subject: [TechAssist] Techwood stereo audio amp. Model # MD65 No
sound (need schematic)
>
>Hi all
>This unit came in with no sound sympton. The set shows no blown
fuses. The
>relay will not engage. The IC output chip STK4231 V was
replaced with no
>changes. I did not have a schematic but was able to trace the
IC regulator
>that controls the relay. That IC is an UPC1237HA (ECG 7100) and
the chip
>appears to be bad. I will be ordering it but did want to find
out if anyone
>had any experiences on this and or a schematic.
>Thanks much!!!!!
>Bill Sorensen
>New Life Video & Audio
>billans@xxxxxxxxxxxx
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