[TechAssist] Re: JVC AV-27920 (D422) Zener
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 17 Apr 2004 06:37:21 -0500
Where is that dratted service manual. Here it is.
Let's see...
IC421 LA7832
I think Bob Waterman posted a parts list for this circuit yesterday. Here
is an excerpt:
IC421 (part# LA7832)
D422 (part# MTZJ75-T2) (75 volt zener)
D541 (part# RGP10J-5025-T3)
R541 (1.8 ohm, 2 watt)
C424 (100mfd/35v)
C425 (470mfd/35v)
This vertical circuit is the same pain as the Sony power supplies with the
2sc4834. ONLY use LA78xx from a GOOD source, such as www.bdent.com or the
sucker WILL bite you.
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
----- Original Message -----
From: "Ed Gaidies" <teltek3@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, April 16, 2004 3:48 PM
Subject: [TechAssist] Re: JVC AV-27920 (D422) Zener
> Nope...have none. I believe a 7830 works...am I wrong?
>
> -Ed-
>
>
>
> Tel-Tek Electronics
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
> ----- Original Message -----
> From: <gulftech@xxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, April 16, 2004 4:05 PM
> Subject: [TechAssist] Re: JVC AV-27920 (D422) Zener
>
>
> > Ed,
> >
> > About a month ago, I was working on the same model. I put (3) LA7832
> > chips in it. Having no more, and seeing a tip in Winstips, I put it a
> > LA7833. Worked fine. Try it if you have one.
> >
> >
> > Ken Smith
> > Gulf Technical Services
> > 3034 Gulf Breeze Parkway
> > Gulf Breeze, FL 32563
> > 850-934-8324 (Voice) 850-932-0819 (Fax)
> >
> >
> > On Fri, 16 Apr 2004 12:52:46 -0400 "Ed Gaidies" <teltek3@xxxxxxxxxxxx>
> > writes:
> > > Bob;
> > > You are absolutely correct. All were bad. But alas...still flat
> > > lined. I
> > > presume I have a bad new Vertical O/P IC. Although it calls for a
> > > 7832 I
> > > replaced it with a 7830, which I think should be OK. But seems to me
> > > I had a
> > > bad batch of LA7830, because I had a ?? on the bag. So I'll order
> > > the LA7832
> > > and give it a fighting chance.
> > > Thanks.
> > >
> > > -Ed-
> > >
> > > -Ed-
> > >
> > >
> > >
> > > Tel-Tek Electronics
> > > Ontario-Canada
> > >
> > > teltek3@xxxxxxxxxxxx
> > > ----- Original Message -----
> > > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Friday, April 16, 2004 12:09 PM
> > > Subject: [TechAssist] Re: JVC AV-27920 (D422) Zener
> > >
> > >
> > > > See the following:
> > > >
> > > > JVC Vertical Failure
> > > >
> > > > You most likely have all or most of the following components
> > > defective in
> > > > that unit (these are the usual bad components with vertical IC
> > > failure in
> > > > these JVCs) so you better check or replace them all:
> > > >
> > > > IC421 (part# LA7832)
> > > > D422 (part# MTZJ75-T2) (75 volt zener)
> > > > D541 (part# RGP10J-5025-T3)
> > > > R541 (1.8 ohm, 2 watt)
> > > > C424 (100mfd/35v)
> > > > C425 (470mfd/35v)
> > > >
> > > > Bob Waterman, CET® #RI-28
> > > > Master Technician License #9109
> > > > Service Manager / Parts Manager
> > > > Gemini Computer, TV, & Security Alarms
> > > > (508)695-7302
> > > > (508)695-7769 FAX
> > > > geminitv@xxxxxxxxxxx
> > > > geminitv@xxxxxxx
> > > > www.geminicomputertvsecurityalarms.com
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "Ed Gaidies" <teltek3@xxxxxxxxxxxx>
> > > > To: <techassist@xxxxxxxxxxxxx>
> > > > Sent: Friday, April 16, 2004 11:57 AM
> > > > Subject: [TechAssist] JVC AV-27920 (D422) Zener
> > > >
> > > >
> > > > > Anyone have a value for this zener from Pin 2 of vertical Output
> > > IC?
> > > Diode
> > > > > is designated D422.
> > > > >
> > > > > Thanks.
> > > > >
> > > > > -Ed-
> > > > >
> > > > >
> > > > >
> > > > > Tel-Tek Electronics
> > > > > Ontario-Canada
> > > > >
> > > > > teltek3@xxxxxxxxxxxx
> > > > >
> > > > >
> > > >
> > > >
> > >
>
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