[TechAssist] Re: citizen model JCTV2704 chassis M3L523S
- From: Alvin Rose <ajroseca@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 04 Aug 2004 19:18:05 -0700
Hi Damon
I will check the capacitors in the collector circuit
and the divider ladder in the pincusion circuit..the waveform
I referred to was on the output transistor Base lead
would this effect the input to the base lead.
Alvin
Damon wrote:
>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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