10)Fuser Unit Error(Error 170-177); Fuser Unit Error(Error 170-177); An Error Occurs Right After Turning On The Power; An Error Occurs In 1 Min. From Turning On The Power - Oki C5500 Maintenance Manual

7.5.2.(10)

Fuser Unit Error(Error 170-177)

(10-1)An error occurs right after turning on the power

Confirmation Items
(10-1-1) Malfunction of thermistors
Upper thermistor, lower
thermistor, frame thermistor
Installed state of fuser unit

(10-2)An error occurs in 1 min. from turning on the power

Confirmation Items
(10-2-1) Temperature rise of fuser unit
Thermostat, halogen lamp
(10-2-2) Temperature rise of fuser unit
Installed state of upper
thermistor
Installed state of lower
thermistor
(10-2-3) AC input for halogen lamp
AC voltage of low-voltage
power supply
Heater-on signal delivered
from PU to low-voltage power
supply
43085101TH Rev.1
Confirmation Tasks
Check to see if the thermistors are short-circuited or open.
Check the resistance value through the connector pins below
the fuser unit.
(See Subsection 8.1 Check of resistance values (Fuser unit.)
Check to see if the fuser unit is securely pushed in to such a
position that the connector at its lower part is plugged in.
Confirmation Tasks
Ensure that the heater control is properly exerted, and touch the
fuser unit to confirm that it is hot.
If it remains cold, confirm that the resistance between pin 1 and
pin 6 of the connectors (2) measures from several ‰ to several
tens of ‰.
Check to see if the upper thermistor is installed away from its
prescribed position, causing the temperature to be measured
low. Detach the heater cover, and check visually for warpage of
the sensor, etc.
Check to see if the lower thermistor is located away, whereas it
should be in contact with the unit, causing a lower temperature
than the prescribed one to be detected.
Check to see if the AC voltage for the heater is supplied
normally.
Between pins 1 and 2 and between pins 3 and 4 of the CN
connector of the power supply.
Check to see if the heater-on signal turns active at the warming-
up timing. "L" active while it is ON.
Pin 11 and pin 12 of the POWER connector of the PU PCB
(PRX PCB)
Oki Data CONFIDENTIAL
Action at NG
Replace the fuser unit.
To use a new fuser unit
on a trial basis, use
FUSE KEEP MODE of
the System
Maintenance Menu.
Redo the installation of
the fuser unit.
Action at NG
Replace the fuser unit.
To use a new fuser unit
on a trial basis, use
FUSE KEEP MODE of
the System
Maintenance Menu.
Replace the fuser unit.
To use a new fuser unit
on a trial basis, use
FUSE KEEP MODE of
the System
Maintenance Menu.
Replace the fuser unit.
To use a new fuser unit
on a trial basis, use
FUSE KEEP MODE of
the System
Maintenance Menu.
Replace the low-
voltage power supply.
Replace the PU PCB
(PRX PCB).
209 /