[TechAssist] Re: rca ctc185AA
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 8 Jan 2002 10:24:46 -0600
Frank and All,
Thanks for the kind words. The exciting part of this business is that we
DO learn every day. I always though the 185 to be a horrible chassis.
Then came the 203!! Jerry sent a post regarding this EEPROM problem that
sheds some light. I will copy that post below, in case you missed it.
(Thanks, Jerry for sending this information.)
RCA had a service bulletin about this problem:
Symptom: The tuner cannot be aligned correctly using the XX15053-470
microprocessor built in service mode.
Cause: An error in the microprocessor code causes the incorrect value to
be
stored in the EEPROM when the alignment is made using the built in
service
mode.
Cure: If the microprocessor is marked XX15053-470, use Chipper Check
software to align the tuner. If the microprocessor is marked
XX15053-47A,
the built in service mode should align correctly.
Jerry
Christians Electronic Service
Enjoy the day, and make friends and money!
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32561
850-934-8324 (Voice) 850-932-0819 (Fax)
-----------------
On Tue, 8 Jan 2002 06:09:43 -0800 (PST) Frank Luu <fkluu@xxxxxxxxx>
writes:
>
>
> Ken:
> Thanks for your info, I'm learning new things
> everyday... I went thru this problem before, on CTC
> 185 25" and 27" only,I ordered eprom from different
> company and ,eventually, there was one that work. To
> today, I still don't know why and have no good answer
> to it.
> Good day
> Frank
> --- gulftech@xxxxxxxx wrote:
> >
> > Frank,
> >
> > By very nature, an EPROM is an Eraseable
> > Programmable Read Only Memory.
> > The pre-programmed variety has "normal" values
> > stored which make them
> > faster to use, especially with the tuner parameters.
> > They still may have
> > to be "adjusted," especially vertical size or
> > horizontal frequency. I
> > use the pre-programmed EEPROMS 90% of the time and
> > have had no trouble
> > changing register contents.
> >
> > What may be missing or corrupt is the clock pulse on
> > pin 6, but I don't
> > know enough to address that issue and have never had
> > the problem. Pin 5
> > is the serial data used both to address and read
> > content. I don't know
> > that can work and the training manuals I have don't
> > explain its
> > operation.
> >
> > I will be very interested to hear other comments on
> > this issue and to
> > hear the solution.
> >
> >
> > Ken Smith
> > Gulf Technical Services
> > 3034 Gulf Breeze Parkway
> > Gulf Breeze, FL 32561
> > 850-934-8324 (Voice) 850-932-0819 (Fax)
> >
> > ----------------
> >
> >
> > On Mon, 7 Jan 2002 14:54:40 -0800 (PST) Frank Luu
> > <fkluu@xxxxxxxxx>
> > writes:
> > >
> > > some of the eproms is pre-program which you can
> > not be
> > > changed.( I guess you try to adjust vertical size)
> > You
> > > may order an eprom from different sources.
> > > Frank
> > >
> > > --- Rafael Gallegos <gallegra@xxxxxxxxxxxxxxxx>
> > wrote:
> > > >
> > > > When setting parameters in new eprom this tv
> > does
> > > > not hold the new
> > > > values it gets back to the old settings. try
> > pushing
> > > > power button after
> > > > setting new values but tv goes back to original
> > > > settings.
> > > > Does anyone has experienced this problem?
> > > > any help appreciated.
> > > >
> > > > Thanks
> > > >
> > > > Rafael Gallegos
> > > > Lead electronics technician
> > > > Rockford corp.
> > > > ------------------------------------------
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