Paper never picks.
Paper feeds continuously.
Paper wrinkled or bent.
Note: When you make voltage readings, always use frame ground unless
another ground is specified. See the wiring diagram in the back of
the book for more information.
Cooling fan service check
Service checks which involve measuring voltages on the
LVPS/HVPS (low voltage power supply/high voltage power
supply board) should be performed with the printer positioned
on its back side.
Make sure the fan cable plug is properly seated
at J18 (controller card).
Turn the printer off, and disconnect the cooling
fan cable from the controller card.
Turn the printer on. Within a few seconds, the
controller card assembly should apply between
+24 V dc to pin 2.
• If voltage is present and the fan is not turning,
replace the cooling fan. If the fan still doesn't
function, replace the controller card.
Note: The fan speed is controlled by a
module on the printed circuit board. Between
+8 V and +24 V dc are constantly supplied at
pin 2 (J18). Pin 1 is ground while pin 3
receives feedback from the fan motor.
• If voltage is not present, check the cables and
"Paper never picks" on
"Paper picks during POST and/
or continuously" on page
"Paper "trees," wrinkles, stacks
poorly, or curls" on page