Maintenance Station Service Check - Lexmark WinWriter 100 Service Manual

4076-0WJ

Maintenance Station Service Check

The maintenance station has two functions:
1. Cleans the print head nozzles during the print operation.
2. Seals the print head when it is not being used to prevent the noz-
zles from drying.
FRU OR PROCEDURE
1 Maintenance Drive Assem-
bly
2 System Board
3 Maintenance Rocker
Assembly
4 Wiper
5 Cap
Note: if the failure remains, replace the system board.
9
ACTION
Disconnect J4 from the system 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 system board.
A bind in the drive assembly can pre-
vent the motor from turning. Check for
binds and loose or worn parts in the
drive assembly. Also check the motor
gear
Turn the printer off and disconnect J4
from the system 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 machine
goes through POST.
Check for binds or wear.
A worn wiper will cause degraded
print quality just after a maintenance
cleaning. Check for loose or worn
wiper.
A worn cap will cause the print head
nozzles to dry and clog. Check for
loose or worn cap.