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Possible cause Step
connecter
Broken
2
thermistor
wire
3
heater
DC controller 4
PCB
DC controller
Laser/scanner 1
unit
DC controller
PCB
Connector
6 - 4 0
Check
Are connector 5210 on the DC
controller PCB and connectors 5741
and 5743 on the connector PCB
making good contact?
Remove the t%dng unit and measure
the resistance between connectors
180 to 280 kQ (at room temperature]?
Remove the fbdng unit. 1s there
continuity between connector 5743-l
and 5743.8 on the flxlng unit?
Open the delivery cover and let the
switch the power ON. 1s the voltage
between connectors J215-1 (/FsRD)
and TB201-6 (GND) on the DC
controller PCB Initially about 5.1 VDC.
and does It change to about 1.5 VDC
as the fixing roller warms up?
Switch the power ON. Is the voltage
between connectors 5215-2 (RLD) and
Check
Are connectors 5208 and 5209 on the
DC controller PCB making good
contact?
Result
Procedure
NO
Reattach the connectors.
NO
Check the wiring from
connector 5213 on the DC
controller PCB to the
thermistor. If wiring is
proper, replace the
thermistor.
Check continuity in the
NO
Replace any defective parts.
NO
Replace the DC controller
PCB.
YES
Replace the power supply.
NO
Replace the DC controller
PCB.
Result
Procedure
YES
Check by using the laser
malfunction
diagnostic
flowchart in Section III C.
NO
Reattach the ronnectors.
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