44015503TH  Rev. 1 
230 /
Oki  Data  CONFIDENTIAL
7.  TROUBLESHOOTING PROCEDURE
If the following error is issued, check the corresponding fuse of the CU control board, PU 
control board and high voltage power supply board.
(Refer to Table 7-6.)
Table 7-6 Fuse error
Fuse Name Error Description Insert Point Resistance
PU board
F1 Service call 918 (However, 
if the Duplex unit is not 
installed, it is the 2nd/3rd 
hopping error.)
Duple
x, 2nd/3rd  24V
Less than
1 ohm
F2 Power supply shut-down PU board 5
V
F3 ID UP/DOWN error. Service 
call 142
Belt motor, ID UP/DOWN 
motor 24
V
F4 Cover open High voltage power supply 
board, ID cooling fan, fuser 
f
an 24V
F5 Service call 122 Power supply fan, feed 
solenoid, f
eed motor 24V
High voltage 
power supply 
board
IP901 Cover open High v
oltage  24V
IP902 Service call 121 High v
oltage  5V
CU board 
F506 •
  Service call 131 to 134 
error
•
  All white page print 
LED HEAD  5V
F505 Service call 131 to 134 
error
LED HEAD  3.3
V
F501 HDD error HDD  5
V
F503 CENTRONIX interface error CENTR
ONIX interface  5V
F502 CENTRONIX interface error CENTR
ONIX interface  3.3V
F507 Host USB error PCI  5
V
7.6  Fuse check