[TechAssist] Re: citizen model JCTV2704 chassis M3L523S
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 3 Aug 2004 07:18:38 -0500
You have open or off-value high voltage caps on the collector, you may also
find bad caps in the pincushion's "divider ladder" . The spikes and "square
wave" effect are the indicators.
Damon Brunger
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Alvin Rose" <ajroseca@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, August 02, 2004 9:40 PM
Subject: [TechAssist] citizen model JCTV2704 chassis M3L523S
| Hi Guys
| we have a citizen tv which is shorting the horrizontal output
| transistor..Have replaced it twice..Set will run for half an hour
| and then will short the transistor..Scoped the collector and there is no
| saddle in the waveform but a small amount of ringing on the reference
line.
| The base waveform looks like a modified square wave with a number of
| high spikes at the start and finish of the waveform..I replaced the 22 mfd
| electrolytic in the primary of the driver transformer with no improvement.
| Driver transister tests ok..Had anyone had this problem with this model
| Your help is appreciated
| Alvin Rose
| Radio & Tv Centre
| Marystown, Nl
|
|
|
|
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