Lexmark 4090-001 - Manual (Page 25)

Diagnostic Information 2-14
4090-001
Transport Service Check
FRU Action
1 Transport Motor Check the motor for binds, or loose motor pulley.
Disconnect the transport motor (J4) from the
system board. Check for 8 to 18 ohms between
pins 1 and 2 on the motor cable. If the reading is
incorrect, replace the motor.
Check for motor pins shorted to the motor housing.
If you find a pin shorted to the housing, replace the
motor. If the failure remains, replace the system
board.
2 System Board Turn the printer off and disconnect J4 from the
system board. Turn the printer on and check for a
pulse of 6 to 8 V dc between J4-1 and ground as
the printer goes through POST.
3 Carrier Guide Rod Clean the carrier rod.
Note: Do not lubricate the rod or the carrier rod
bearing surface.
4 Transport Belt
Idler Pulley Parts
Carrier Frame
Check for worn, loose or broken parts. Check for
obstructions blocking carrier movement.
Carrier to carrier frame engagement should be
lubricated with grease P/N 1329301.
5 Encoder Strip Check for wear and dirt.
6 Printhead Cable
Encoder Strip
Encoder Card
System Board
Be sure connector J2 is fully seated. Check the
cable for damage.
Perform the ’Encoder Sensor Test’ on page 3-2 . If
you cannot enter the test, replace the system
board.
7 Maintenance
Station A problem with the maintenance station can cause
carrier movement problems at the right margin. Go
to the
’Maintenance Station Service Check’ on
page 2-7 .