[TechAssist] Re: FIXED, RCA CTC131M, dead.
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 10 Dec 2004 17:02:17 -0500
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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--
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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