HP 19C carriage return

[Katie Wasserman]

(09-08-2014 11:41 PM)Geoff Quickfall Wrote:  p.s. I have this ocurr on two machines that were working. could it be over voltage from 4 alkaline (6,0 volts) versus 4.8 volts NiCad. would it require a shotsky diode to reduce the voltage.

That's a good bet. The 19C is particularly sensitive to voltage, but 6 volts is probably not too high. More likely you have too low a voltage getting to the motor drive circuit. Make sure you have good, clean battery contacts on the PCB (one of them looks sort of yucky to me).