Lexmark X73 4402-001, Service Manual

Page: 26 / 64

2-12
Service Manual
4402-001
2 Paper Feed Motor 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 paper feed mechanism
With the paper feed motor cable J3 disconnected
from the system board, check for approximately 5
ohms between the following pins on the motor:
Pin 3 to Pin 4
If the readings are incorrect, replace the print
engine. Go to the
“Print Engine Removal” on
page 4-11 .
Although the paper feeds in a forward direction
only, the paper feed motor turns in two directions.
If the paper feed motor turns in one direction only,
replace the system board. Go to the
“System
Board Removal” on page 4-12 .
Binds in the paper feed motor or gear train can
cause intermittent false paper jam errors. Remove
the paper feed motor and check the shaft for binds.
Also check for a loose or worn motor gear.
3 Auto Sheet
Feeder Assembly Check the pick roller for wear.
4 Mid Frame
Assembly Check the following for wear:
• Small Feed rollers
• Large Feed roller
• Exit roller
• Star rollers
If any rollers need to be replaced, go to the “Print
Engine Removal” on page 4-11 and replace the
print engine.
5 End-of-Forms
Flag and Spring Check for binds or damage.
FRU Action