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 C8800 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
43170003TH Rev.2
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 Ω to
several tens of Ω.
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
CN2 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
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.
of the PU
244 /