Lexmark Z31 Color Jetprinter Service Manual - Page 19

Service Checks, Carrier Transport Service Check - driver

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4099 Service Checks Carrier Transport Service Check FRU Action 1 System Board 2 Carrier Transport Motor Unplug the printer and disconnect the carrier transport motor connector (J8) from the system board. Plug in the printer and check for approximately 12 V dc between (J8-1) and ground as the printer goes through POST. If the voltage is incorrect, replace the system board. If the voltage is correct, check for carrier transport motor pins shorted to the housing. If a short is detected, replace the carrier transport motor. Check the motor for binds, or loose motor pulley. A noisy or chattering motor or a motor that fails to turn can be caused by: • An open or short in the motor. • An open or short in the motor driver on the system board. • A bind in the carrier transport mechanism. With the carrier transport motor cable disconnected from the system board, check for 0 to 10 ohms between the following pins on the motor: J8-1 and J8-2 J8-3 and J8-4 If the readings are incorrect, replace the motor. 3 Carrier Guide Rod Clean the carrier rod. Note: Lubricate the rod and the carrier rod bearing surfaces with grease P/N 99A0394. Diagnostic Information 2-5

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Diagnostic Information
2-5
4099
Service Checks
Carrier Transport Service Check
FRU
Action
1
System Board
Unplug the printer and disconnect the carrier
transport motor connector (J8) from the system
board. Plug in the printer and check for
approximately 12 V dc between (J8-1) and ground
as the printer goes through POST. If the voltage is
incorrect, replace the system board. If the voltage
is correct, check for carrier transport motor pins
shorted to the housing. If a short is detected,
replace the carrier transport motor.
2
Carrier Transport
Motor
Check the motor for binds, or loose motor pulley.
A noisy or chattering motor or a motor that fails to
turn can be caused by:
•
An open or short in the motor.
•
An open or short in the motor driver
on the system board.
•
A bind in the carrier transport
mechanism.
With the carrier transport motor cable
disconnected from the system board, check for 0
to 10 ohms between the following pins on the
motor:
J8-1 and J8-2
J8-3 and J8-4
If the readings are incorrect, replace the motor.
3
Carrier Guide Rod
Clean the carrier rod.
Note
: Lubricate the rod and the carrier rod bearing
surfaces with grease P/N 99A0394.