[TechAssist] Re: CTC197 - Repeated failure of HOT (C5148)
- From: "Ray Lufkin" <Rlufkin@xxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 19 Nov 2001 18:26:16 -0500
Yes I agree with John. Get out your Sencore scope (only one made that can
look at the hot collector safely) and interrogate the 900 volt pp pulse.
Does it look nifty with no ringing and especially width/timing has to be
right on the money (12us) because it's ususally the duration of the timing
that makes it overheat.. I have the Sencore HA2500 Horizontal Analyzer that
makes quick work of this kind of horseshit . That thing is worth every dime!
----- Original Message -----
From: "John Robertson" <pinball@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, November 19, 2001 12:32 PM
Subject: [TechAssist] Re: CTC197 - Repeated failure of HOT (C5148)
>
> When we run into repeated HOTs failing I pull out the scope and check the
> collector of the HOT for signs of ringing or damping problems. It is more
> likely to be a bad capacitor than the driver transformer...I'd replace the
> capacitor(s) first, then check the temp of the HOT.
>
> John :-#)#
>
> At 07:30 AM 11/19/01, you wrote:
>
> >Phil,
> >I had this very same problem with a CTC 187 chassis. Don't know if it
will
> >be of any help on the CTC197 or not. Check to see if the HOT runs hotter
> >than normal to the touch, if it does I had to replace Horiz. Driver
> >Transformer (#215541) and C4306 (#188594) to solve shorting of HOT.
Remember
> >these part #'s are for a CTC187 chassis.
> >
> > Dan Webster
> > Webster's TV
> > Shullsburg, Wi.
> >----- Original Message -----
> >From: <Philstv@xxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Saturday, November 17, 2001 8:18 AM
> >Subject: [TechAssist] CTC197 - Repeated failure of HOT (C5148)
> >
> >
> > > Hi All. I had this set in some weeks ago. I replaced the HOT (C5148)
and
> >the
> > > fly which I had to wait 4 months to get. The set came back dead again.
I
> > > replaced the shorted HOT and it played for about 20 minutes and
shorted
> > > again. Anybody had this problem?
> > >
> > > Phil - Phil's TV
> > >
> > >
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