[TechAssist] RCA Chipper Checker, first time user, help please

  • From: Gary McCartney <number63@xxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sat, 20 Jul 2002 18:34:33 -0400

I have my new Chipper Checker connected to a CTC178L projection set. The
set is dead because some mouses pee'd on the chassis (I mentioned this
set a few months ago in case anyone remembers, but I only work on it
when I'm caught up with customers items- it belongs to my buddy who is
very patient).

I installed the new eeprom and microprocessor kit before I got the
Chipper Checker.
Now with the Chipper Checker connected, I get error code 136, TVB (tone/
volume/ balance) which means U1503 is not communicating with the
micrprocessor. Does this mean that U1503 or associated circuit is bad? 
I do have U1600 removed from the circuit (stereo decoder IC) so why
doesn't Chipper Checker come up with error code 128 (no communication
from U1600) ?
How accurate is this Chipper Checker at determining faults?


The basic problem with the set is that when remote power button is
pressed, I get 3 chirps, then nothing. During these chirps, I get 120 V
pulses B+ on the main 135V line, and I get a nice looking horizontal
output waveform on the HOT collector. I have the flyback lead to the HV
splitter disconnected. I removed U1600 because of corrosion on the pins.
Replaced micro and eeprom because pins were corroded and thought that
could be the problem with set not starting. I also have CRT boards
unplugged from the tubes.


Thanks for any help.
-- 



Gary McCartney

McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: number63 (at) inetsonic.com
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