[TechAssist] Re: RCA CTC203 shutdown circuit
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 30 Mar 2004 13:00:11 -0500
John,
Don't rule out the HOT.
Remove it and check for leakage.
From Tech Repair CD:
RCA\CTC203\DEAD (switch mode supply not
running)\\\\Fuse*Q14101*Q14102*Q14103\\\\\\\\
RCA\F25422TX41\Dead*HOT shorted(Q14401)\Main V. reg Q14101 shorted*R14109 open.
Research indicated the fly
most probably bad\\CTC203AC4\HOT/D2578(Q14101/242224)*
Flyback(14536119A/T14401/244229)* Main
reg(P9NBSO/Q14101/244223)\Reg(MPS8599/Q14102/147665) P.S.
Resistor(750r5%.25W/R14109/179317)*P.S.
Reg(MPSA06/Q14103/232218)\\\\\\\
Also, www.tritronicsinc.com sells a kit for these, CTC203-KIT, I believe...
It may save you some time.
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "John H Smit" <jhsm@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, March 30, 2004 4:13 AM
Subject: [TechAssist] Re: RCA CTC203 shutdown circuit
Hi Jeff
First of all thank you for your response.
The one is a 31" F31317 CTC203CA6,and the other one is a F27628,CTC203AA13.
The horizontal out transistor does not short out when left on squeeling like
that but Q14101 the regulator will after a couple minutes.
I have scoped pin three of T14101 and it shows the 156 volt it calls for but
the volts p/p is five volt instead of seven volt.
Pin eight of T14101 shows 220 volt p/p instead of 440 p/p it calls for.
Pin nine does show 15.8 volt P/P instead of 27 V p/p.
I have changed all of the transistors in the primary of T14101,and checked
all of the diodes,including the zeners.
Also changed U14101,the photo coupler.
I have a RCA service bulletin TV99-002 what says,the feedback voltage from
pin nine of T14101 may generate a false trip of the power supplies
protection circuitry.
The on/off switching within the powersupply may result in a audible noise
chirp to emit from T14101.
I do not see a shutdown circuit in the chassis's,I was wondering if it has
one.
Thanks again Jeff.
----- Original Message -----
From: Intrepid Video Support <support@xxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, March 30, 2004 2:28 PM
Subject: [TechAssist] Re: RCA CTC203 shutdown circuit
> John,
> You have to include the model numbers. You give no indication if this is a
projection or direct view.
> I'll send a troubleshooting guide to you.
>
> Jeff Dougherty
> Intrepid Video TV/VCR
> 263 S Front St
> Steelton PA 17113
> fax...717-564-4952
> www.intrepid-video.com www.tech-repair.net
>
> ----- Original Message -----
> From: "John H Smit" <jhsm@xxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, March 29, 2004 2:50 PM
> Subject: [TechAssist] RCA CTC203 shutdown circuit
>
>
> Hello to all
> Does anybody know how to disable the shutdown cicuit?
> I have two RCA's 203 and with the same problem that it is starting up and
> shutting down,which creates a loud squeel at the Switchmode transformer
> T14101.
>
> If I can disable the shutdown circuit I be able to run the set on ninety
> volt and trouble shoot with out shutting down.
> Please anybody with the right info let me know.
> Thank you in advance
> John H Smit
> Smit's TV Service
> Box10
> Gunnison Utah 84634
> 800-355-4948 Phone&Fax
> 435-528-7955 Phone&Fax
> jhsm@xxxxxxxxxx
>
>
>
>
>
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