[TechAssist] Re: RCA CTC169

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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