[TechAssist] Re: FIXED : Mitsubsihi VS50501A Z905 Repeat Failure
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 29 Jan 2004 19:07:04 -0500
Turned out to be a faulty STK391-020 AMP IC. Isolated the problem by
unplugging the convergence coil plugs one at a time and running the set.
What was odd was that the fuse didn't blow until after about 60 seconds or
so from a cold start......chip had to warm up a tad before it failed.
I pulled the blue convergence plug first and after that 60 seconds the Red
CRT dimmed and made this god awful screech!! But did not blow the
fuse....although I hit the power real fast!
Removed the red and the blue and ran it for a few minutes , then scoping the
pins on the convergence plus for those two crts , revealed -22VDC on the red
convergence plug! Bingo!
Changed the IC8W00 STK391-020 fixed it....running nice right now. -24 Line
draws 1/2 amp consistently
=================================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
(860)399-1861
(860)664-3535 FAX
jstielau@xxxxxxxx
=================================
----- Original Message -----
From: "Shoreline Electronics" <jstielau@xxxxxxxx>
To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 29, 2004 1:44 PM
Subject: [TechAssist] Mitsubsihi VS50501A Z905 Repeat Failure
>
> Make : Mitsubishi
> Model : VS50501A
> Problem : Set will open pico fuse Z905 (-24V supply to Convergence) after
a
> couple minutes. Convergence looks good .....till the fuse opens!
>
> I see several tips on diodes D909 (FR302) and D908 (SF64) and D913 (SF64)
> opening up or becoming leaky and causing Z905 to open.
>
> Diodes check good........Maybe breaking down under load.....still testing
> for that.
>
> Anyone had this issue before?
>
> Also.....any subs for the SF64?
>
> We do have the service manual.
>
> =================================
> Jeff Stielau
> Shoreline Electronics Repair
> 344 East Main Street
> Clinton,CT 06413
> (860)399-1861
> (860)664-3535 FAX
> jstielau@xxxxxxxx
> =================================
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