[TechAssist] Re: Marantz A/V Receiver - TA135AV - Blowing Outputs
- From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 25 Mar 2004 21:50:11 -0400
David;There is a good article in ''The Speaker'' about this problem.It
involves placing 100 ohm resistors on the E/C pads with the o/p's pins
lifted.............
Don of HARTS-TVCR''ASC''
9 Robert St,Oromocto,NB,Can,E2V3N2
hartstv@xxxxxxxxxxx
Tel-5063579785,fax-3576010
cel-4701719
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, March 26, 2004 9:38 AM
Subject: [TechAssist] Marantz A/V Receiver - TA135AV - Blowing Outputs
> OK, first I should let you all know that I don't work on many audio
> amplifiers, I'm OK with the module stuff, but when it comes to
> transistor outputs, I, well, hmmm, we won't even go there! I acquired
> this amplifier (broken) many moons ago, at that time I wasn't that
> versed in amplifier repairs however I'm learning, a lot. Needless to say
> I've been through a few outputs. I think I took all the precautions
> before installing new outputs, I confirmed the +/- power supplies, I
> checked the emitter resistors, I confirmed there was a good undistorted
> signal coming out of the pre-drivers before replacing the outputs, I
> reset the output idle current (this might be where the problem lies) and
> confirmed there was no DC on the outputs. Still the amplifier will blow
> outputs, the last time I didn't even have speakers hooked up, I was
> monitoring the idle current and poof. I don't have any specific
> information for setting up the proper idle current and I'm not too sure
> how to do this. What are some of the methods for setting up the idle
> current without information? Or better still, does anyone have the
> service manual for this receiver; I would really like to restore this
> unit if at all possible.
>
> Thanks in advance,
>
> David Lessard
>
> Alexandria Electronics
> Alexandria, Ontario, Canada
> K0C-1A0
>
> mr_fixit@xxxxxxxxxxxx
>
>
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