Error Occurs Approx. 1 Minute After The Power Is Turned On - Oki MC561 Maintenance Manual

Oki Data CONFIDENTIAL

(11-2) Error occurs approx. 1 minute after the power is turned on.

Check item
(11-2-1) Temperature increase of fuser unit
Thermostat, Heater of the fuser unit is controlled of its
halogen lamp temperature. Check if the fuser unit gets hot or
not by touching it with hands.
If the fuser unit temperature does not increase
and remains cold, check that the resistance
between pin-1 and pin-2, and that in between
pin-3 and pin-4 of the two connectors is in the
range of several ohms to several ten ohms
respectively. (Refer to section 8.1 Resistance
value (fuser unit).)
44473001TH Rev.1
Check operation Actions for NG
results
Replace the
fuser unit.
If any attempt
of using new
fuser unit as
a trial is going
to be made,
be sure to use
the System
Maintenance
Menu FUSE
KEEP MODE.
Check item Check operation
(11-2-2) Temperature increase of fuser unit
Installation position Check if the upper thermistor is installed in the
of the upper far position from the specified position or not
thermistor causing detection of the lower temperature than
the actual temperature of fuser unit.
Remove the heater cover, and check warpage of
sensor by visual inspection.
Installation position The lower thermister must be installed while
of the lower contacting with the fuser unit. Check if the lower
thermistor thermister is installed in the far position from the
specified position or not causing detection of the
lower temperature than the actual temperature of
fuser unit.
(11-2-3) AC power input to the halogen lamp
AC power voltage Check if the AC voltage for heater is normally
from the low voltage supplied or not.
power supply Power supply CN2 connector
and pin-2, and between pin-3 and pin-4.
Heater ON signal Check that the heater ON signal goes active at
that is output from the warming up timing, or not.
PU to the low "L" active while ON.
voltage power CU/PU board POWER connector-10 pins 14 and
supply 15
7. TROUBLESHOOTING PROCEDURES
Actions for NG
results
Replace the
fuser unit.
If any attempt
of using new
fuser unit as
a trial is going
to be made,
be sure to use
the System
Maintenance
Menu FUSE
KEEP MODE.
Replace the
fuser unit.
If any attempt
of using new
fuser unit as
a trial is going
to be made,
be sure to use
the System
Maintenance
Menu FUSE
KEEP MODE.
Replace the low
voltage power
, between pin-1 supply.
Replace the
CU/PU board.
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