Xerox Phaser 8400 Service Manual page 97

Troubleshooting Procedure for 13,067 to 13,071 Error Code (Drum Thermistor)
Step Questions and Actions
1 1. Using service diagnostics, run the Drum
Temperature Sensor test.
2. Did the test pass?
2 1. Inspect the sensor wiring harness.
2. Is the wiring free from defects? Is the wiring
correctly routed through the pass-thru and
not pinched against the drum assembly
frame?
13,072.48: The preheater got too hot.
13,074.41: The preheater took too long to reach its setpoint.
13,131.44:
The preheater thermistor circuit is open.
13,133.46:
The preheater thermistor circuit is shorted.
13,135.48: The preheater thermistor returned a bad reading, or the reading was
corrupted by ESD.
Troubleshooting Procedure for 13,072 to 13,135 Error Code (Preheater)
Step Questions and Actions
1 1. Verify that the ambient temperature of the
room is within the printers optimal
environmental specification (see
"Environmental Specifications" on
page 1-11).
2. Is the room too cold or too hot?
2 1. Run the Preheater test.
2. Did the test pass?
3 1. Check the wiring from the preheater.
2. Is the wiring connected properly and sound?
13,136.49: The printhead left jetstack heater is too hot.
13,138.42: The printhead left jetstack heater took too long to reach its setpoint.
13,195.45:
The printhead left jetstack thermistor circuit is open.
13,197.47: The printhead left jetstack thermistor circuit is shorted.
13,199.49: The printhead left jetstack thermistor returned a bad reading, or the
reading was corrupted by ESD.
Service Manual
Yes
Go to Step 2. Replace the
drum
temperature
sensor.
Replace the Replace the
drum sensor wiring
temperature harness.
sensor.
Yes
Advise Go to Step 2.
customer of
specification
requirements.
Replace the I/O Go to Step 3.
board.
Replace the Replace the
preheater wiring harness.
board.
No
No
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