Lexmark Medley 4012-005, Service Manual

Page: 18 / 90

4012-0XX
9
Maintenance Station Service Check
The maintenance station has two functions:
1. Cleans the printhead nozzles during the print operation.
2. Seals the printhead when it is not being used to prevent the noz-
zles from drying.
Note: If the failure remains, replace the printer board.
FRU Action
1 Maintenance Drive Assembly Warning: Disconnecting the maintenance
motor while the machine is plugged in can
damage the printer board. Voltage is present
on the board even with the power switch off.
Disconnect J4 from the printer board. Check
for 18 ohms (±4 ohms) between pins 1 and 2
at the motor. If the reading is incorrect,
replace the maintenance drive assembly.
Check for motor pins shorted to the motor
housing. If you find a shorted pin, replace the
maintenance drive assembly. If the symptom
remains, replace the printer board.
A bind in the drive assembly can prevent the
motor from turning. Check for binds and
loose or worn parts in the drive assembly.
Also check the motor gear.
2 Printer Board Turn the machine off and disconnect J4 from
the printer board. Turn the machine on and
check for a pulse of 15 V dc between J4-1
and ground on the system board as the
printer goes through POST.
3 Maintenance Rocker Asm Check for binds or wear.
4 Wiper A worn wiper causes degraded print quality
just after a maintenance cleaning. Check for
loose or worn wiper.
5 Cap A worn cap causes the printhead nozzles to
dry and clog. Check for loose or worn cap.