Error Occurs Approx. 1 Minute After The Power Is Turned On - Oki MC873dn Maintenance Manual

Oki Data CONFIDENTIAL
(5-2)

Error occurs approx. 1 minute after the power is turned on.

Check item
(5-2-1) Temperature increase of fuser unit
Thermostat, heater Heater of the fuser unit is controlled of its
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-4 and between pin-3 and
pin-4 is about 4 to 7Ω, between pin-1 and pin-
2 and between pin-3 and pin-2 is about 1 to 3Ω
respectively. (Refer to section 6.3 Resistance
value (fuser unit).)
(5-2-2) Temperature increase of fuser unit
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.
45850101TH Rev.1
Actions to be taken
Check work
at NG
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.
Check item
(5-2-3) AC power input for the fuse
AC power voltage Check if the AC voltage for heater is normally
from the low voltage supplied or not.
power supply Power supply J2 connector, between pin-1 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 voltage "L" active while ON.
power supply Power connector of the CU/PU board, between
pin-18 and pin-19.
2. TROUBLESHOOTING PROCEDURES
Actions to be taken
Check work
at NG
Replace the low
voltage power
supply.
Replace the CU/
PU board.
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