[TechAssist] Re: FIXED, RCA CTC131M, dead.

From: "al m" <ampm@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Fri, 10 Dec 2004 17:08:54 -0500
What's the # on it maybe I have one you can have.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message ----- 
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, December 10, 2004 5:02 PM
Subject: [TechAssist] Re: FIXED, RCA CTC131M, dead.


> This is a judgement call.
> Technically,legally, any time you defeat an "integral safety part" you
> are altering the FCC and UL type acceptance of the unit, and assume
> liability for any resulting damages  connected to your modification.
> Now. real world: danger?, probably not. I might put a light fuse inline
> with the primary lead. The original was inside the windings so if the
> transformer overheats, the part will sense the heat and open. "Thermal"
> cut off, not over-current  cutoff. I bypassed one in a stereo for my own
> use. many transformers don't even use them. It's your call.
> Phil Bader
>
> Kevin wrote:
>
>>So by bypassing the fuse, this set is not safe to send out?
>>
>>Kevin Wilks
>>Kevin's TV & Video Repair
>>Penticton BC Canada
>>kevintv@xxxxxxx
>>
>>
>>-----Original Message-----
>>From: techassist-bounce@xxxxxxxxxxxxx
>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Phil Bader
>>Sent: Friday, December 10, 2004 5:54 AM
>>To: techassist@xxxxxxxxxxxxx
>>Subject: [TechAssist] Re: FIXED, RCA CTC131M, dead.
>>
>>Yes. Internal thermal cutoff in series with primary winding. You are
>>simply bypassing the fuse.
>>Phil Bader
>>
>>Kevin wrote:
>>
>>
>>
>>>Solution was standby transformer was open.  I took apart the
>>>
>>>
>>transformer
>>
>>
>>>and found a wire that wasn't connected to the set, but was connected to
>>>one side of the primary that was open.  Is this wire (second winding)
>>>protected by a thermal fuse inside the transformer?  The transformer
>>>measures about 20 ohms.
>>>
>>>With this temporary fix, I found vertical foldover at the top of the
>>>picture.  Replacing C512, a 4.7uF @ 100 volts cured it.
>>>
>>>Kevin Wilks
>>>Kevin's TV & Video Repair
>>>Penticton BC Canada
>>>kevintv@xxxxxxx
>>>
>>>
>>>-----Original Message-----
>>>From: techassist-bounce@xxxxxxxxxxxxx
>>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of tvservice
>>>Sent: Wednesday, December 08, 2004 2:32 PM
>>>To: techassist@xxxxxxxxxxxxx
>>>Subject: [TechAssist] Re: RCA CTC131M, dead.
>>>
>>>Kevin
>>>tighten screws to chopper power transistor and solder leads to socket.
>>>If still won't come on look for single red wire from tuner assembly
>>>
>>>
>>that
>>
>>
>>>plugs in near power supply
>>>with ac power applied pull this wire loose , if set powers on (will
>>>
>>>
>>have
>>
>>
>>>loud volume and raster on screen but no tuner operation)
>>>go back and recheck tuner control assembly, usually solder connections
>>>and
>>>bad electrolytic caps.
>>>If still doesn't come on look for power supply problems
>>>hth
>>>Robert
>>>tvservice@xxxxxxxxxxxxx
>>>H & H Electronics Inc
>>>
>>>----- Original Message ----- 
>>>From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
>>>To: <techassist@xxxxxxxxxxxxx>
>>>Sent: Wednesday, December 08, 2004 4:13 PM
>>>Subject: [TechAssist] Re: RCA CTC131M, dead.
>>>
>>>
>>>
>>>
>>>
>>>
>>>>CTC133B: may not turn on or turns on erratically:
>>>>Choke L403 coupling the +131V source to "source 1"(on sams) had cold
>>>>solder connection.Located  near rectifiers at front of chassis.
>>>>CTC130:
>>>>Immediate shutdown after turn on.With variac lowering AC voltage it
>>>>cycled on/off moments later fkyback exploded.
>>>>CTC131A: dead. Chopper output Q101. tighten screws and pins. (metal
>>>>
>>>>
>>>>
>>>>
>>>case
>>>
>>>
>>>
>>>
>>>>part)
>>>>CTC133B: Lightning, dead. Repl. tuner/remote module MTT008A. and
>>>>
>>>>
>>>>
>>>>
>>>chassis
>>>
>>>
>>>
>>>
>>>>parts: R102(2.7 ohm 15W), F100(5A fuse),Q100 (VIPUR FET# 164599).
>>>>CTC130: Dead. blows 5A fuse:
>>>>cap C425 (.43mfd@200v) shorted.(HOT collector measured 0 ohms to gnd
>>>>until yoke plug removed as test)Also R101 3.9 ohm 10 watt open.
>>>>Hope these arcaic records help.
>>>>;-)
>>>>Phil Bader
>>>>
>>>>
>>>>Kevin wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>This is a 19 year old 27" RCA that will not power up.  I soldered the
>>>>>infamous tuner connections, with no difference and the fuse and HOT
>>>>>tested good.  This is the most difficult chassis that I have worked
>>>>>
>>>>>
>>>>>
>>>>>
>>>on.
>>>
>>>
>>>
>>>
>>>>>Are there any common failures with this chassis?  TIA.
>>>>>
>>>>>Kevin Wilks
>>>>>Kevin's TV & Video Repair
>>>>>Penticton BC Canada
>>>>>kevintv@xxxxxxx
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>----------------------------------------------------------------------
>>>>
>>>>
>>-
>>
>>
>>>>
>>>>
>>>>
>>>>
>>>----
>>>--
>>>
>>>
>>>
>>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>-- 
>>>>
>>>>Philip Bader
>>>>Jan Phyl TV Inc. (estab. 1976)
>>>>3420 Recker Hwy. Winter Haven, Fl. 33880
>>>>Fax (863) 299-8821
>>>>email: tjanphyl@xxxxxxxxxxxxxxx
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>-----------------------------------------------------------------------
>>>
>>>
>>-
>>
>>
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>>>---
>>>
>>>
>>>
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>>
>>
>>
>
> -- 
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
>
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References:
- [TechAssist] Re: FIXED, RCA CTC131M, dead.
  - From: Kevin
- [TechAssist] Re: FIXED, RCA CTC131M, dead.
  - From: Phil Bader
[TechAssist] Re: FIXED, RCA CTC131M, dead.

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