[TechAssist] Re: RCA CTC179CM won't start
- From: "Dave Huston" <DaveHuston@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 21 Jan 2002 17:55:48 -0500
Phil,
Thanks for the pointers. I'll start by checking the PS (B+)
first. That's my 1st guess since there is a small rastor for just a second.
This is pulled in on all sides appearing to be low B+. I'll let you know
what I find.
Dave
----- Original Message -----
From: "Phil Bader" <philbad@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, January 21, 2002 3:03 PM
Subject: [TechAssist] Re: RCA CTC179CM won't start
>
> Here's some to start: I'm concentrating on a vertical defect,but it may
> be the PS."vert sweep shrinking",R4519 changes value.:" Three black bars
> at top 1/4 after 4 minutes",C4507. "Turns on then turns off at
> once.U4501,Q4401,C4115 had been replaced". The bad C4115 had caused the
> B+ to climb from the 135V to 200V.This also damaged CR1416. "Vert.
> foldover and U4501 was at 25V B+" The vertical adjustment parameter was
> so extreme the pix was way off the screen.Tech could not see the OSD but
> could push the buttons and count til he knew he was at the vert hgt
> parameter and set it lower. Let me know.Also the B+ adj. pot is known to
> be intermit. open.This would affect the PS.
>
> Dave Huston wrote:
> >
> > Phil,
> > It is a vert foldover. I'm assuming it's because the b+ is low but it's
hard
> > to check 'cas it only stays on for maybe 3 seconds.
> > Dave
> > ----- Original Message -----
> > From: "Phil Bader" <philbad@xxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, January 21, 2002 8:51 AM
> > Subject: [TechAssist] Re: RCA CTC179CM won't start
> >
> > >
> > > I assume by fold-over in picture you do NOT mean a vertical circuit
> > > folover since you checked the HOT.Is it like a horiz. drive
> > > foldover?Specify plse.
> > >
> > > davehuston wrote:
> > > >
> > > > Hoping you RCA techs have a quick fix on this one. It tries to start
at
> > power on for just an instant. Has small folded-over image on screen when
on
> > button is pressed then goes off. I have checked C4006, HOT and soldered
many
> > questionable connections. Any help is appreciated.
> > > > Dave
> > > >
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