[TechAssist] Re: Sharp VCR VC-H972U - SMPS Dead
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 25 Aug 2004 09:26:37 -0500
Sharp's website does'nt list a model VC-H972U they have VC-H992U could this
be close or do you have the wrong model?
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, August 25, 2004 4:13 AM
Subject: [TechAssist] Re: Sharp VCR VC-H972U - SMPS Dead
> I'm going to need a scan of the SMPS to figure this one out. Can anyone
> oblige? Thank-you.
>
> David Lessard
> Alexandria, Ontario. Canada
> mr_fixit@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Edward Gaidies
> Sent: Wednesday, August 25, 2004 1:14 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Sharp VCR VC-H972U - SMPS Dead
>
> Yup..I feel the same way. I guess I better get educated on these, looks
>
> like they are going to be around for a while. Got a couple of Toshiba's
>
> on the bench, as we speak. Problem in SMPS.
>
> -Ed-
> Ed Gaidies
> Tel-Tek Electronics
> Ontario-Canada
> teltek3@xxxxxxxxxxxx
>
>
>
>
> On 24-Aug-04, at 3:11 PM, David Lessard wrote:
>
> > Hi Techs,
> >
> >
> > Let me be the first to tell you all that I really haven't had great
> > luck
> > repairing SMPS's lately. VCR came in dead, apparently after a hydro
> > outage, when the power came back on primaries on two other appliances
> > were open and this VCR's SMPS was dead. Fuse was blown, main switching
> > transistor and driver transistors on the primary are OK yet the fuse
> > blows on AC plug-in. I've checked ALL diodes and transistors,
> > everything
> > tests OK. Base of the main switching transistor has .7VDC on it all
> the
> > time, so this transistor is "ON" all the time, hence the blowing fuse.
>
> > I
> > need more information on these SMPS's, I.e. Where do the switching
> > pulses derive from? If anyone has a schematic on this SMPS, please
> send
> > it along.
> >
> >
> >
> > Thank-you
> >
> >
> >
> > David Lessard
> >
> > Alexandria, Ontario. Canada
> >
> > mr_fixit@xxxxxxxxxxxx
> >
> >
> >
> >
> >
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