HP-19C Repair Odysee

[teenix]

In this case, the PIK chip automatically does the print carriage home as the printer home test instruction (PIK1120) does not execute by the ACT on the HP-19C or HP-97 at switch on.

This was also confirmed on my 97 CPU board.

cheers

Tony

(07-05-2021 08:43 PM)PANAMATIK Wrote:  Your machine can be restored somehow, I'm sure. If the motor moves to HOME position at power up, this proves that at least ACT and PIK and ROM chips are working, because moving the motor is an active software part. Did you check the Display Enable signal VDISP ? 1818-0432 U7/pin 5 must be High

Bernhard