Diagnostic Information 2-55
4085-001
Maintenance Station Service Checks
FRU Action
1 Maintenance
Station Assembly
The maintenance carrier is driven in a front to rear
motion by the maintenance stepper motor. A
homing sensor is provided at the rear of the
maintenance station to home the maintenance
carrier during power up. Engine code software
controls the step count from the home position to
the various positions the maintenance carrier must
move to accomplish the various maintenance
tasks on the printheads. Utilizing cams and
linkages, the various components on the
maintenance carrier are actuated by the carrier
motion.
Check the maintenance carrier moves through its
complete forward to back motion without binds.
Check the maintenance station for worn, broken or
dislodged parts.
Check that the maintenance sensor is snapped
securely into the maintenance station frame.
2 Maintenance
Motor Assembly
Check for approximately +1.8 V dc at pins 1, 2, 3,
and 4 on connector (J3) on the engine board. If
voltage is incorrect, replace the engine board. If
voltage is correct, check connector and voltage at
the motor. Check for a short in motor and for
binds. If a short or bind is found, replace the
motor.
3 Peristalic Pump Check the hose connections. If okay, replace the
pump. See “Peristaltic Pump Removal” on
page 4-49 .
4 Maintenance
Homing Sensor
If the access door switch does not work or carrier
does not move, check (J3) connector pin number 7
for approximately +5 V. If voltage is correct, check
connection at the sensor. If connection is good,
replace sensor. See “Maintenance Sled Test” on
page 3-33 .
5 Wiper A worn wiper can cause degraded print quality just
after a maintenance cleaning. Check for a loose or
worn wiper.
6 Cap A worn cap can cause the printhead nozzles to
dry and clog. Check for a loose or worn cap.
