[TechAssist] Re: RCA CTC169
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 29 Jun 2005 07:44:37 -0500
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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