[TechAssist] Re: Mitsubishi CS-2723C, 1990 model,chassis VM1-A-C23R, lack of width
- From: Al Gutz <alg@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 07 Apr 2004 23:19:23 -0400
Kevin
Guess that makes us even on this one.
Don't have a manual but Q505 appears to be some sort of voltage
regulator in the horz/pincushion area. The drive to base of Q505 comes
from IC501 and thats where he width and pin controls are.
If Q505 is open width is about 1/2 the screen, guess it wasn't
conducting properly when cold, uneducated guess.
Al G
Kevin wrote:
>
> Q505 was also my fix as well. After the set warmed up I sprayed Q505
> with coldspray and the problem returned. Replaced it with a used sub
> and now the set has full width at turn on. Thanks, Al. Now a question:
> What would cause the transistor to work properly when it got hot?
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Al Gutz
> Sent: Tuesday, April 06, 2004 8:08 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Mitsubishi CS-2723C, 1990 model, chassis
> VM1-A-C23R, lack of width
>
> Just fixed that trouble to-day.
>
> Was Q505 sub ecg375, could also be IC501 as it provides drive to Q505.
>
> Ed would you know the correct value of R552 and C523 in this set,
> someone replaced them and I don't like the look of what was used.
>
> Al G
> Al's TV-Electronics
> Pembroke Ont.
> Canada
>
> Ed Gaidies wrote:
> >
> > Sub C546 Pin 2 of PCC Transformer T552.
> > .02/400V.
> >
> > -Ed-
> >
> > Tel-Tek Electronics
> > Ontario-Canada
> >
> > teltek3@xxxxxxxxxxxx
> > ----- Original Message -----
> > From: "Kevin" <kevintv@xxxxxxx>
> > To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, April 06, 2004 4:03 PM
> > Subject: [TechAssist] Mitsubishi CS-2723C, 1990 model, chassis
> VM1-A-C23R,
> > lack of width
> >
> > > Picture is 1-2 inches narrower than it should be at first turn on.
> > > After a few minutes the width is normal. All caps in hor,
> pincushion
> > > and P/S checked good for ESR. Any tips on this set? It still has a
> > > very good picture for an older set so is worth repairing. TIA
> > >
> > > Kevin Wilks
> > > Kevin's TV & Video Repair
> > > Penticton BC Canada
> > > kevintv@xxxxxxx
> > >
> > >
> > >
> > >
> > >
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