11) Motor Fan Error (Errors 122, 127, 128, 918); The Low Voltage Power Supply Fan Does Not Rotate Immediately After The Power Is Turned On - Oki B721 Maintenance Manual

Oki Data CONFIDENTIAL
Check item
(10-2-3) AC power input for the fuse
AC power voltage Check if the AC voltage for heater is normally
from the low supplied or not.
voltage power Power supply CN03 connector
supply pin-1 and pin-4, and between pin-2 and pin-3.
Heater ON signal Check that the heater ON signal goes active
that is output at the warming up timing, or not.
from PU to the "L" active while ON.
low voltage power Power connector
supply between pin-24 and pin-26.
45487001TH Rev.1
Actions to be taken
Check work
at NG
Replace the low
voltage power
, between supply.
Replace the
PU/CU board.
of the PU/CU board,

6.5.2.(11) Motor fan error (Errors 122, 127, 128, 918)

(11-1) The low voltage power supply fan does not rotate immediately after the power is
turned on.
Check item
(11-1-1) Cable connection condition and wiring condition
Cable connection Check if the connectors are connected
condition and normally or not.
wiring condition Check if extra length of the cables does not
of the low voltage touch the fan blade or not.
power supply fan
and those of the
fuser fan
(11-2) Rear fan does not rotate during the Duplex printing.
Check item
(11-1-2) Cable connection condition and wiring condition
Cable connection Check if the connectors are connected
condition and normally or not.
wiring condition of Check if extra length of the cables does not
the Duplex fan touch the fan blade or not.
24V power supplied Check if the fuse F1 of the PU/CU board has
to the fan blown out or not.
6. Troubleshooting procedure
Actions to be taken
Check work
at NG
Correct the
connection
condition of
the connectors.
Correct the
cable wiring
route. Replace
the fan.
Actions to be taken
Check work
at NG
Correct the
connection
condition of
the connectors.
Correct the
cable wiring
route. Replace
the fan.
Replace the
PU/CU board.
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