Lexmark 4227 Service Manual - Page 39
Carrier drive service check, When a 637 - machine or thermal error
UPC - 734646117104
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4227-300 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 The printer has stopped to protect the carrier CA Thermal Error 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. Diagnostic information 2-15