[TechAssist] Re: RCA CTC169
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 28 Jun 2005 06:46:42 -0500
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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