HP-19c almost works

[Jonas Sandstedt]

Hello,
It has taken some time, but now I have checked the transistors in question, and they seem fine.
I have also analyzed the calculator's behaviour more in detail, and to summarize:

In print mode “MAN” it works normally, except print commands that require printing more than one line. PRT STK results in that on empty line is printed, but is not followed by the four registers. The same for PRT REG and so on. PRX works, only one line being required.
In the print modes NORM and TRACE only one line is printed no matter what print action that required, it seems as if the printer only prints one line even if more lines are requested no matter what print mode that is selected. The printed line is printed correctly.
Furthermore, in the print modes NORM and TRACE, one line is printed when a calculation such as +, SIN, LN and so on is chosen, but only the “simple” calculations such as +, - and so on works, for SIN, LN etc. the X register is unchanged.

I thought that the motor might create some disturbance, and tried to change the motor capacitor, but that did not help.

I am grateful for any suggestions regarding how to handle this.

best regards
Jonas