[TechAssist] Re: RCA CTC169
- From: Bill Grabowski <bgrabowski@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 29 Jun 2005 19:18:06 -0500
Yes I have pulses on pin 23......................
Bill Grabowski
Triangle Appliance
Kenosha, WI 53142
Wayne Vanaman wrote:
> Bill:
> My head is pretty thick.
> Are you saying you have pulses the micro pin 23, or that you do not have
> pulses on the micro pin 23 but you do have pulses on transistor q4402?
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl. 32506-3310
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
>
> 850-456-5995 voice
> 850-458-6369 fax
>
>
> Bill Grabowski wrote:
>
>>Yes I have 5volts PtoP and collector and base of Q4402 on the money!!
>>
>>Bill Grabowski
>>Triangle Appliance
>>Kenosha, WI 53142
>>
>>Wayne Vanaman wrote:
>>
>>
>>
>>>Bill:
>>>
>>>Any RCA (ok, most) with an autoprogram problem: Check H Sync going into
>>>the micro. No H sync, no memory. Set defaults to "air", no channels
>>>stored in memory, and channels can be tuned manually. Set can be put in
>>>"cable", and channels can be tuned manually.
>>>
>>>Most brands of TVs autoprogram looking for that 3.58 burst. Most brands
>>>store the "jammed" channels, because they have a 3.58 burst.
>>>
>>>Not RCA. RCA figures that if there is no H Sync you don't want to watch
>>>it anyway, so who cares if it is in color.
>>>
>>>H Sync on micro U3101p 23 about 5V. It comes through a convoluted path.
>>> The last active semi before the micro is SMD Q4402 pn 215495, a high
>>>failure part number. 5.4V pulses on the emitter, 9vdc on the collector
>>>1.09vdc on the base. I guess about 5V pulses on the base, the schematic
>>>doesn't say, the show 11V pulses then a 4700/5100 ohm voltage divider to
>>>ground.
>>>
>>>Let us know if you have H Sync on the micro.
>>>
>>>Wayne Vanaman
>>>Omega Electronics
>>>6904 W Fairfield Dr
>>>Pensacola, Fl. 32506-3310
>>>
>>>Wayne@xxxxxxxxxxxxxxxxxxxxx
>>>WWW.PensacolaTVRepair.Com
>>>
>>>850-456-5995 voice
>>>850-458-6369 fax
>>>
>>>
>>>Bill Grabowski wrote:
>>>
>>>
>>>
>>>>What I thought to be an easy job turned into a dog. This set will not
>>>>lock on channels quick enough to allow auto-programming. I have changed
>>>>the following and re-adjust the aft tank coil after each for the
>>>>quickest lock on station. I replaced the IC1001,comb filter,tuner,AFT
>>>>tank coil. I have all the necessary voltages at the tuner. Anyone have
>>>>any ideas?? I'd appreciate it,Thanks!!
>>>>
>>>> Bill G.
>>>
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>>
>>
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--
*****************************
Bill Grabowski
Triangle Appliance
Kenosha,Wi 53142
262-694-6500
262-694-6523 fax
bgrabowski@xxxxxxxxx
*****************************
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