[TechAssist] Re: Mitsubishi CK3526 Bad Vert output again
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 25 Sep 2002 19:37:01 -0500
Actually installed new LA7838 and it ran for 45 seconds before it blew up in
smoke. Had installed new caps about 2 years ago, but was surprised to find
one leg on C4E2 had literally rusted away! Wouldn't have known that until I
decided to ESR the caps and discovered that C4E2 "just didn't feel right",
that's when I discovered that the leg, although it looked connected,
actually wasn't . Ended up smoking R914 in SMPS's 34 volt supply, any idea
what value it is???
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, September 24, 2002 9:20 AM
Subject: [TechAssist] Re: Mitsubishi CK3526 Bad Vert output again
>
> Good question, but I know of none. We do a lot of these older Mitsubishi
> sets and rarely see repeat failures unless related parts are bad.
> Check/change all of the caps in the supply and pump up circuit paths
related
> to the vertical output. They are usually going to be bad. Also, you
might
> check the yoke. If you pull it off and look at the windings you may find
> some corrosion (green or black) which might indicate an intermittent
short.
> We have seen a couple of these.
>
> Leonard G. Caillouet
> Service Manager
> Electronics World
> Gainesville, FL
> 352-332-5608
> 352-332-5668 (fax)
>
> ----- Original Message -----
> From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
> To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> Sent: Monday, September 23, 2002 7:31 PM
> Subject: [TechAssist] Mitsubishi CK3526 Bad Vert output again
>
>
> >
> > Hey does anybody have any info on a BEEFIER LA7838, may be an La7836 or
> > something that might handle a little more power?
> >
> > I have this customer that needs a new LA7838 every 2 years in the above
> > model
> >
> > Thanks for any info you have.
> >
> > FYI new caps 2 years ago, and B+ is 34V.
> >
> > Damon Brunger
> > damon101@xxxxxxxxxxxxxx
> > Telrad Electronic Services
> > Ft Wayne, IN 46815
> >
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