[TechAssist] Re: RCA CTC187cn Dead - Micro? FIX
- From: Al Gutz <alg@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 09 Sep 2003 23:01:55 -0400
The solution was bad T-chip, guess it was causing the micro to hang up.
Al G
Al Gutz wrote:
>
> Have a 187 dead. HOT not shorted, smps OK, all 5V and 12V supplies good.
>
> On IC3001 (micro) pin 5 KD1 should be low 0V with positive pulse, this
> is running at 2.5V no pulse. pin 6,7,8 KS1, KS2, KS3 are running at 2.5V
> should be 4.7V. Unpluged keypad so no shorted switches. The wave form on
> the crystal at pins 36,37b is good. No other waveforms on micro, supply
> V is at 5V. Replaced eeprom.
> Am I looking at a bad micro, want to be sure because it will likely cost
> more than the set is worth but I have never ran into a bad micro on
> these before.
> Thanks for any help
>
> Al G
> Al's TV-Electronics
> Pembroke Ont.
> Canada
>
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