HP 46 repair

[AndiGer]

Went to the test points.
+6 V --> +5.72 V
-12 V --> -11.50 V
+15 V --> PRT OFF -0.5 V, PRT ON 14.80 V increasing to 15.00 V
Seem to be ok.

Measured at the (blue) printer connector at the board, red vs. black wire: PRT OFF 0.00 V, PRT ON 13.80 V. Motor does not spin.

Will remove the printer's screws so I can open the left side cover where the motor and the electronics of the printer are situated. But still no idea, what to observe there. I will see. Or maybe somebody can give some hints ... ?