[TechAssist] Appears fixed: CTC169 vertical
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 24 Dec 2003 01:26:07 +0000
Resoldering everthing in the area including all of the sufacemounts and
replacing the 1.54uf square cap seems to have fixed the problem (it did not
test bad). Seems to be pandemic in this area right now had 2-3 sets come in
(CTC169's) last week and 3 or 4 this week all with various vertical
problems.
Peter Oliver
Tucson Radio TV
From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: CTC169 vertical
Date: Tue, 23 Dec 2003 12:24:45 -0500
The pin 2 and 3 winding on the flyback in the case of the CTC169 chassis
does not supply the B+ for the vertical circuit, it is part of the vertical
output/feedback loop as is an extra winding in the horz drive transformer. I
have had at least 2 of these with the flyback winding open but none that
were intermittent.
**************************************************
Jim Myers
Since 1972
Telrad Electronic Services Co.
Fort Wayne, IN 46815
*************************************************
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, December 23, 2003 12:06 PM
Subject: [TechAssist] Re: CTC169 vertical
So when this happens, has anyone added a separate 26 V dc power supply
to power the vertical without having to replace the flyback? How about
winding wire around the flyback core to make up a supply for the
vertical?
Just wondering for future reference.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
D Trippel wrote:
>
> I agree. I have a ctc169js6 on my bench right now that will run for days,
then
> vertical will collapse. open winding between pins 2 and 3 on flyback.
> Don Trippel
> Don's Electronics
> Rosthern Sask
> Canada
>
> "Terry H." wrote:
>
> > Peter, I've had it twice. Had an open winding for pins 2 and 3 of the
fly
> > which feed the vertical circuit, pin 3 thru the horiz. drive
transformer. I
> > think pin 2 should have 300vpp and pin 3 125vpp. Not that common but
could
> > have an intermittent on that winding.
> > Terry H.
> > The TV Shop
> > Gonzales, Tx
> >
> > ----- Original Message -----
> > From: <tvservice@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, December 23, 2003 8:45 AM
> > Subject: [TechAssist] Re: CTC169 vertical
> >
> > > Never replaced flyback on 169 for vertical
> > > have seen 2 small caps give intermittent vertical collapse or
compressed
> > > change C4518 and C4519 both .33mfd polyester caps in series at base
Q4506.
> > > Also had cracked surface mount cap once C4521 8200pf at U4501 pin 3.
> > > hth
> > > Robert
> > > tvservice@xxxxxxxxxxxxx
> > > H & H Electronics Inc
> > > Dallas, TX
> > >
> > >
> > > ----- Original Message -----
> > > From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, December 22, 2003 11:15 PM
> > > Subject: [TechAssist] CTC169 vertical
> > >
> > >
> > > >
> > > >
> > > > Have several CTC169 sets with intermittant vertical problems,
> > > > (intermittant fluttering/colapse) Have checked the capactiors and
> > > > connections following schematic no effect get worse when warm- tap
> > > sensitive
> > > > in generalized way. Can desensitize (at least as a temporay test
> > measure)
> > > by
> > > > placing shims under board to deflect board upward. since hese sets
use a
> > > > moldulated flyback drive to run the vertilcal. I have seen several
tips
> > on
> > > > vertical problems to replace the flyback. Any one have any historys
on
> > how
> > > > often it is necessary to replace the flyback in ctc 169's to cure a
> > > vertical
> > > > problem...
> > > >
> > > > Peter Oliver
> > > > Tucson Radio TV
> > > >
> > > > _________________________________________________________________
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> > >
> >
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