HP 200 Service Manual page 64

Voltage
+24 V Motor drivers and voltage regulator on the main PCA.
(Regulated +20 V for cartridge circuits on the carriage PCA).
+12 V Fan power and RS-232 driver.
–12 V RS-232 driver.
+5 V IC power and sensors.
The primary side of the power supply contains rectified line voltage
W F R N I N G
that can be lethal when touched even if the ON/OFF switch is OFF.
Remove the power plug before working inside the electronics
enclosure. Also, leave the power supply insulating door closed when
you need to work on the main PCA only.
Use