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Diagnostics and Troubleshooting
Message Problem
15 FUSER FAIL
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A rotation error of the pressure roller cam has occurred.
There is an unfused image at the fuser.
16 FUSER FAIL
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Pressure roller cam did not stop or is out of position after
stop attempt or the sensor is bad.
17 FUSER FAIL
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Pressure roller cam did not start or the sensor is bad.
18 FUSER FAIL
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The sensor that detects the position of the speed control
plate is defective.
23 THRMISTR FAIL
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Thermistor wire broken.
24 THRMISTR FAIL
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Thermistor shorted due to extraordinarily high temperature.
25 ENCODER FAIL
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Defective or dirty encoder needs to be replaced.
26 HEA
TER FAIL
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Fuser did not warm up within specified time.
27 HEA
TER FAIL
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Fuser temperature not maintained during printing.
28 BEAM DET FAIL
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Beam detect failure. Motor spinning but not generating
interrupts.
29 LSU FAIL
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No “ready” returned from LSU phase lock circuit.
30 LSU FAIL
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LSU phase lock lost.
31 LSU FAIL
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“Ready” returned from LSU phase lock circuit but LSU
motor not enabled.
32 MISPRINT ERROR
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Failed handshaking between engine and CPU controller
board.
33 REPLACE EEPRM
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Engine controller EEPROM has exceeded its life
expectancy of 100,000 writes.
35 EC CKSUM FAIL
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A checksum error occurred while reading the EEPROM on
the engine controller board.