43502101TH Rev.1
67 /
Oki Data CONFIDENTIAL
4
Fusing unit error (ERROR 170) (ERROR 171) (ERROR 172) (ERROR 173)
• Turn the power off, then back on again.
• Yes
Is the thermistor open or shorted? Measure the resistance between thermistor contacts (heater
contacts 120V/2
Ω
or 240V/7
Ω
, and thermistor contacts 200K
Ω
at room temperature) (see
Figure 5-2).
• Yes Replace the fusing unit.
• No
Do the thermistor connector is connected to the high voltage/sensor board connector?
• No
Connect the thermistor connector property.
• Yes
Is the heater of the fusing unit turned on (when the heater is turned on, light is emitted)?
• Yes
Check the thermistor connector or replace the main control board or the fusing unit.
• No
Is the AC voltage being supplied to the connector for the heater of the power supply board?
(see Figure 5-2)
• No
Replace the main control board or the power supply board.
• Yes
Check the heater connector cord and the heater connector for poor contact .
Heater connector
Thermistor connector
Figure 5-2
Summary of Contents for B4500 Series
Page 1: ...Oki Data CONFIDENTIAL B4500 B4550 B4600 Maintenance Manual 032007A PRINTING SOLUTIONS ...
Page 17: ...43502101TH Rev 1 17 Oki Data CONFIDENTIAL Upper cover unit Figure 2 2 Upper cover ...
Page 85: ...43502101TH Rev 1 85 Oki Data CONFIDENTIAL 2 High Voltage Sensor Board ...
Page 88: ...43502101TH Rev 1 88 Oki Data CONFIDENTIAL 3 Power Supply Board CN2 CN101 ...
Page 171: ...Please refer to the Illustrated Parts Manual for spare part information ...