Service Checks; Carrier Transport Service Check - Lexmark 4300 Series Service Manual

4421-XXX

Service checks

Carrier transport service check

FRU
• System Board
• Carrier
Transport
Motor
Carrier Guide Rod
Encoder Strip
2-10
Service Manual
Action
Check the carrier transport motor connector J18 on the
system board. If it is connected, check for
approximately 30 V dc on pins 1 and 2 or at the wire
connections located on the rear of the carrier transport
motor. If voltage is incorrect, replace the system board.
Go to "System board removal" on page
voltage is correct, check the carrier transport motor for
binds or a loose motor pulley.
A noisy or chattering motor or a motor that fails to turn
can be caused by:
• A broken circuit or short-circuit in the motor
• A bind in the carrier transport mechanism
Disconnect the carrier transport motor cable J18 from
the system board and check for 0 to 10 ohms between
the two wires on the carrier transport motor. If the
reading is incorrect, replace the print engine. Go to
"Print engine removal" on page
Clean and lubricate the carrier guide rod.
Lubricate the rod and the carrier rod bearing surfaces
with grease P/N 99A0394.
Verify that the encoder strip is installed correctly and is
free of grease or dirt. If the encoder strip is not installed
correctly, it can cause the carrier to slam against the
side frame.
If the encoder strip and all connections are okay, but
the carrier slams the side frame, replace the system
board. Go to "System board removal" on page
4-16. If
4-11.
4-16.