[TechAssist] CTC203 Width Twitches
- From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
- To: "Techassist@Freelists. Org" <techassist@xxxxxxxxxxxxx>
- Date: Sat, 16 Feb 2002 00:32:50 -0500
Greg:
Believe it or not but I bet your main filter cap right off the rectifiers is
either bad or bad connections on it. I have seen that cap cause twitches
before on the CTC203 chassis. If that is not it, resolder the choke between
the horizontal drive transformer secondary and the H.O.T base. Let us know
which one of these fixes your set. Inquiring minds want to know.
Perry Bower
Electric Medic
"It's Cheaper to Keep Her"
3850 Washington Road Suite 5b
Martinez, Georgia 30907
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-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Mitchell TV
Sent: Friday, February 15, 2002 5:17 PM
To: Tech Assist
Subject: [TechAssist] CTC203 Width Twiches
GE 35GT740 CTC203
Horizontal Width "Twitches". Usually when the set is cold. I have sometimes
seen a "hourglass" shape to the raster, (looks like complete loss of pin
correction.) That problem is very intermittent.
No stored error codes.
Width and Pin Service adjustment work, but don't stop the problem.
Replaced: Q14401 Hot, CR14402 Damper, C14801 S-cap, Q14802 Pin Output,
Q14801 Pin Driver, U14801, Pin Amp
Power supply B+ good, steady.
Hot Collector waveform looks good, rock steady.
Pin CBA Output waveform amplitude seems to "twitch" with the raster. Input
waveform, dont think so, (kind of small)
(is this a normal circuit reaction to feedback from somewhere down the line
in horiz deflection?)
Any ideas? This one's starting to consume my kid's college education.
Greg
Mitchell TV
Niles, MI
70650.1534@xxxxxxxxxxxxxx
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