[TechAssist] Re: Sharp VCR VC-H972U - SMPS Dead
- From: "John at Main TV" <maintv2004@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 25 Aug 2004 09:51:14 -0600
Yes, VC-H972 is a good model number. It is an the same manual as VCA373,
582,583 and VCH972, 982, 983. It is also in Sams VCR303 (we often forget to
look there). Everything I have is on paper but I can fax the power supply
if you like. John.
John Mielke
Main TV
636 main St.
Longmont, Co
phone 303 776 6955
fax 303 776 0792
maintv2004@xxxxxxxxxxx
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, August 24, 2004 1:11 PM
Subject: [TechAssist] Sharp VCR VC-H972U - SMPS Dead
> 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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