[TechAssist] Re: Technics - Integrated Amplifier - SU-V98 - PowersUp - No Output
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 10 Nov 2005 18:33:11 -0500
Thanks for the tip William, I will look into the possibility that the preamp
circuit is not working and also confirm DC supply voltages before posting a
followup. In the meantime my request for a service manual is still out
there.
David Lessard
mr_fixit@xxxxxxxxxxxx
Alexandria, Ontario, Canada
----- Original Message -----
From: William E Miller <prototech@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, November 10, 2005 6:11 PM
Subject: [TechAssist] Re: Technics - Integrated Amplifier - SU-V98 -
PowersUp - No Output
> Gary's tip is probably dead on. It's probably the IC, and of course lots =
> of
> soldering, including the input RCA jacks / grounds.
>
> The output IC can indeed be shorted without blowing the fuse. The short
> doesn't have to be across the supply line(s), after all.
>
> You can check for DC supply levels on the output lines of the IC. Follow =
> the
> leads that go to the output relay or the big air-core coils / inductors.
>
> Sometimes an output IC will have a fusible resistor feeding the supply to=
> the
> preamp. If present, that resistor may be out even if the main supplies ar=
> e
> okay.
>
> > David, found this:
> > =
>
> > TECHNICS SUV98KM1 no power or output replace shorted ic501 =
>
> > svi3206d power amp, r701 47/1/2w, resolder jack packs
> > Gary McCartney
>
> > > Hello All,
> > > This unit turns "on", display is present and I can select different i=
> nputs
> yet there is no output. Main output IC is one of those SVI-3205 (replaced=
> by
> SVI-3206), I've worked on a couple of these in the past, one where the ou=
> tputs
> were blown (this caused main fuse to blow), the other unit required exten=
> sive
> resoldering. In this case I don't hear the speaker relay engaging, this s=
> hould
> occur a few seconds after power "on". I've resoldered all questionable ri=
> ng
> cracks in and around power resistors, diodes, etc. and still the relay do=
> esn't
> engage. I could use a service manual to further debug this problem, unles=
> s of
> course one of you have experienced this same problem, please do tell.
>
>
>
> William E. Miller, ASEET
> prototech@xxxxxxx
> Indiana USA
>
>
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