Lexmark 4227-X00 - Manual (Page 37)

2-14 Service Manual
4227-X00
Carrier Drive Service Check
Note: When a 637, 638 or 639 error is detected while printing, verify
that the same error is detected after removing jammed paper and
checking that the ribbon guide is in place.
FRU Action
1 637, 638, 639
CA Drive Error Carrier positioning error.
Inspect the following:
• Tension pulley plate
• Carrier
• Carrier belt.
Loosen and tighten the tension pulley plate
screws to make sure the carrier belt is tight.
Disconnect CN9 and move the carrier
manually from left to right and check for
smooth movement.
With CN9 disconnected, check for 5 to 8 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 housing. If
you find a pin shorted to the housing, replace
the motor.
If no problems are found replace the carrier
motor.
2 640
CA Thermal Error The printer has stopped to protect the carrier
motor from overheating. Normally this will not
occur until after several hours of continuous
heavy use in a warm environment, and only
then after going through several stages of
thermal slowdown.
Wait for the machine to cool and see if the error
goes away.
If the machine was not being used heavily
before the error occurred, or if the error returns
when the machine is cool, replace the carrier
motor.