Error Troubleshooting
Xerox Internal Use Only Phaser 7100 Service Manual 2-83
Fuser Unit Fail
The Fuser Unit has failed due to one of the following problems.
• A differential circuit output error was detected between the detection output and the
compensation output of the Fuser Unit NC Sensor.
• When the Lamp On time meets the following conditions, where Tws °C is the temperature at the
Wait state start time that is obtained at the NCSCenter.
• The temperature monitor AD value of the STS-Front was detected to be higher than T[HITMP (2)]
3 times in a row.
• During Warm Up Control, an abnormal detected temperature due to NC Sensor malfunction or
poor contact was detected.
• The Fuser Unit Main Lamp or Sub Lamp has been On continuously for longer than the setting time
(NVM).
• At the first Lamp Off after it was turned On, the NC temperature is continuously at
EP_U4_LOW_NC °C or lower 8 or more times in a row.
• The Thermistor disconnection detected.
• At the first Heater OFF after it was turned On, the detected temperature at the edge STS is
continuously at EP_U4_LOW_STS °C or lower 8 or more times in a row.
• Notified at the moment the Relay is cut off from the circuit.
• The detected temperature at the NC or the STS has not changed during this period, although the
Main Lamp has been On continuously for 15 s or longer.
• The Cool Down Mode has continued for EP_U4_COOL_TIME * 10 s or longer.
Applicable Fault Codes
• 010-311: Fuser Unit Heat Roll STS-1 Disconnection Fail
• 010-319: Fuser Unit NC Sensor Differential Amp Fail
• 010-328: Fuser Unit Warm Up Time Fail (Not Ready)
• 010-331: Heat Roll STS Over Temperature Fail
• 010-332: Heat Roll NC Sensor Disconnection Fail
• 010-333: Heat Roll NC Sensor Over Temperature Fail
• 010-334: Heat Roll NC Sensor Broken Fail
• 010-335: Heat Roll NC Sensor Range Fail
• 010-338: Fuser Unit On Time Fail
• 010-339: Heat Roll NC Sensor Low Temperature Fail
• 010-340: Fuser Unit Detached
• 010-344: Heat Roll STS Sensor Low Temperature Fail
• 010-345: Fuser Unit Hard Relay Off Fail
• 010-346: Fuser Main Lamp Data Renewal Fail
• 010-347: Fuser Sub Lamp Data Renewal Fail
• 010-355: Fuser Cool Down Timeout Fail
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