[TechAssist] Re: Technics - Integrated Amplifier - SU-V98 - PowersUp - No Output
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 14 Nov 2005 13:35:50 -0500
FOLLOWUP:
My eyes and brain are too tired to trace anything today, I haven't been
feeling great the last couple of days, could someone please provide me with
a service manual for this unit. Thank-you. David Lessard,
mr_fixit@xxxxxxxxxxxx, Alexandria, Ontario, Canada.
----- Original Message -----
From: David Lessard <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, November 10, 2005 6:33 PM
Subject: [TechAssist] Re: Technics - Integrated Amplifier - SU-V98 -
PowersUp - No Output
> 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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