[TechAssist] Re: GE VCR VG2021 - ZD6 Shorting
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 25 Mar 2004 20:44:04 -0500
David,
Sounds like you may be using the wrong ground for your voltage measurements.
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, March 26, 2004 12:32 PM
Subject: [TechAssist] Re: GE VCR VG2021 - ZD6 Shorting
Bob,
Yeah this is one of those plug-in types of SMPS's. I replaced the
non-polar cap with a polarized one, noting the polarity; I've done this
a few times before without any problems. ZD5 is now shorted, this
happened when I tried to troubleshoot on the bench out of VCR. I checked
all the caps, replaced a few that were definitely bad before. The only
cap across ZD6 was C17 (4.7uf/50V) which checked OK. Not sure what's
really going on here. The voltage across ZD6 (removed) is 83VDC, voltage
across ZD5 (removed) is 37VDC. This seems a bit high but I'm not sure.
Thanks for the response,
David Lessard
Alexandria Electronics
Ontario, Canada
mr_fixit@xxxxxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Bob@Bobs tv
Sent: Thursday, March 25, 2004 9:55 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: GE VCR VG2021 - ZD6 Shorting
David,
Normally those zener diodes are in the feedback loop and
normally
when they short..Theres a problem on secondary, as its job is to monitor
secondary and report back to primary.. to regulate. Don't have a print
on
that model, but if its one of those plug in supply's there are usually a
lot
of bad caps in the secondary 1000- 330 caps that fail also a NP cap..
Maybe this will help..
Bob,
Bobs TV Worcester, ma
woodman1@xxxxxxxx
Main 508-853-1482
Fax 508-853-1480
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, March 26, 2004 10:44 AM
Subject: [TechAssist] GE VCR VG2021 - ZD6 Shorting
> This VCR was in for service a few weeks ago, SMPS was dead, replaced
the
> following:
>
> Q1 - C4418
> Q2 - ECG382
> D02 - IN4148
> C09 - 22uf/16v
>
> Then the display was blinking when powered up, found ZD6 leaky,
replaced
> it with 33V/1W zener (I think this is supposed to be a 43V zener?),
> anyway, ZD6 blows within a minute of VCR being powered up. What could
be
> causing this? What circuit(s) does this supply?
>
> Thanks in advance,
>
> David Lessard
> Alexandria Electronics
> Alexandria, Ontario, Canada
> mr_fixit@xxxxxxxxxxxx
>
>
>
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