[TechAssist] Re: CTC169 vertical
- From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- 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
> > > >
> > > > _________________________________________________________________
> > > > Check your PC for viruses with the FREE McAfee online computer scan.
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