[TechAssist] Re: RCA CTC169
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 01 Jul 2005 07:25:34 -0500
I hate to be like this, but it sounds like 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:
> 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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