[TechAssist] Re: ctc169 power supply problem
- From: "Damon" <damoneb@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 23 Jul 2005 08:05:08 -0500
Only a 6 volt difference, 118 to 124V???
Normally I think I can get 120 to 160V adjustment out of that pot.
Try thinking in those terms....that the feedback loop with the pot is
feeding back too much.....
Maybe the 2.2uf cap is too big or too small (plate-wise) or the resistors
have changed.....Maybe if you replaced the IC it's not working
correctly.....What about the operation in RUN mode? Do you get 143V in RUN?
Main Supply Cap.....getting 170 Vdc off of it? 33k ohm supply resistor
(supplies IC) OK?
Damon B
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "pete" <tvtech@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>; <tv@xxxxxxxxxxxxxxx>
Sent: Saturday, July 23, 2005 6:21 AM
Subject: [TechAssist] Re: ctc169 power supply problem
> Im still stuck with this one I have checked all diodes and all caps int he
> primary side of the power supply I hooked up a 13.5 volt source
> disconnecting the diode cr4118 and still have 124 volts the pot varies
the
> voltage from 118 to 124 at max on the collector of horiz output. none of
the
> voltages went up on the secondary supply. I have fixed numerous ctc169 but
> this one is a real dog. Any help will be greatly appreciated
>
> Pete
> Perdomo Tv Inc Since 1972
> Miami.Fl
> ----- Original Message -----
> From: "pete" <tvtech@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 15, 2005 6:48 PM
> Subject: [TechAssist] ctc169 power supply problem
>
>
> >I have been stumpt on this one. 120 volts on horiz output transistor in
> >standby. cr4118 has been replaced I dont have 15 volts on diode I cannot
> >measure it fluctuates c4145 1000 micro 50 volts have been also replaced
> >raw bplus is 160v on the money I have replaced c102,c108.c104 u101, and
> >disconnected the audio. Any help will be greatly appreciated
> > Pete
> >
> > Perdomo Tv Inc Since 1972
> > Miami.Fl
>
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