[TechAssist] Re: Sharp VCR VC-H972U - SMPS Dead
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 24 Aug 2004 23:37:26 -0400
Dave,
I don't know if this is close to your model.
From Tech Repair CD:
SHARP\VCH943U\AFTER REPAIRING POWER SUPPLY(Q901 AND FUSE)- VOLTAGES CHECK\OK-
BUT AFTER UNIT IS PUT BACK
TOGETHER TO TEST- IT SMOKES\THE POWER SUPPLY AGAIN.\\DEFECTIVE (SHORTED)
CAPSTAN MOTOR ASSEMBLY-
SHARP\#RMOTN2052GEZZ.\\\\\\\\
Jeff
--
Intrepid Video TV/VCR Repair
263 S Front St, Steelton PA 17113
717-939-7708; (F) 717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, August 24, 2004 3:11 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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