[TechAssist] Re: RCA CTC 187 menu disappears,volume works

  • From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Wed, 06 Jul 2005 06:53:05 -0500

First a little about digital.
The micro has an internal clock and outputs clock pulses.  The data 
pulses are synced to the clock pulses serially.  The other chips on the 
board look for the clock pulses.  Some sets have "enable" lines that go 
from the micro to certain other ICs to activate them.

In you this case, go for the crystal.  I believe they had 4, 8, and 
12MHz versions.  Without a MODEL NUMBER...AL...we can get too specific.

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


Al L wrote:
> I need to know if the micro and the T chip have their own separate clocks or 
> do they share one..
>     The remote and infra red pick up produce pulses at the input of 
> micro,but when locked up,there seem to be no pulses on the clock pins of the 
> T chip,or micro.If I float the micro should I have clock pulses on one chip, 
> the good one?
>    The buttons on front fire up the set,do volume,and produce the menu.About 
> the time I get to auto program,the menu disappears, and I am stuck with one 
> channel.Sometimes it turns off.
>    Any ideas,or does someone have an old training manual for this set?TIA.
> 
> Al Leatherman
> 224 RT. 46
> Mine Hill, NJ 07803
> 973-361-5796
> WWW.ALS-TV.NET
> 
> 
> -----------------------------------------------------------------------------
> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
> Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> Lost Password: http://www.tech-assist.org  and select "Login Problems?".
> Email Archives: //www.freelists.org/archives/techassist/
> 
> 
-----------------------------------------------------------------------------
This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
Lost Password: http://www.tech-assist.org  and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/

Other related posts:

  1. Home
  2. techassist
  3. Archive
  4. 07-2005