44952001TH Rev.2
7-51
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURES
7.5.5.(1) LCD Display Trouble
(1-1) LCD displays nothing
Check item Checking method Action in case of NG
(1-1-1) Checking fuse
Fuse on SU board Check whether F1 or F5 has
blown.
Replace F1 or F5 or SU
board.
(1-1-2) Checking connections
Connection between low-
voltage power supply unit and
SU board
Make sure the low-voltage power
supply unit is connected to the
POWER connector on the SU
board properly.
Check whether the cable connector
is half-connected or tilted, or
whether wires are broken.
Check whether there is any fault in
the cable assembly, e.g., missing
wires.
Connect the cable
properly.
Cable assembly connecting
low-voltage power supply unit
to SU board
Replace the cable with
a good cable.
Connection between SU
board and operation panel
Make sure the 16-pin FFC is
connected to the OPE connector
on the SU board properly.
Make sure the 16-pin FFC is
connected to the CN1 connector
on the OPE board properly.
Check whether the cable connector
is half-connected or tilted.
Connect the cable
properly.
FFC connecting SU board to
OPE board
Check for broken wires using a
tester.
Check visually whether the sheath
peels.
Replace the cable with
a good cable.
Connection between SU
board and CU/PU board
Make sure the 45, 46, 47-pin FFC is
connected to the PDLIF connector
on the SU board properly.
Make sure the 4, 5, 6-pin FFC is
connected to the MFPIF connector
on the CU/PU board properly.
Check whether the cable connector
is half-connected or tilted.
Connect the cable
properly.
Check item Checking method Action in case of NG
FFC connecting SU board to
OPE board
Check for broken wires using a
tester.
Check visually whether the sheath
peels.
Replace the cable with
a good cable.
(1-1-3) Checking power supplies
AC power supplied to the
printer
Check the supplied voltage from
the AC power source.
Supply AC power.
5V power supplied to SU
board
Check the 5V power at 3, 4pin of
the POWER connector on the SU
board.
Replace the low-voltage
power supply.
3.3V power supplied to OPE
board
Check the 3.3V power at 14pin of
the CN1 connector on the OPE
board.
Replace the SU board.
(1-1-4) Checking for short circuit of power supply
5V and 24V power supplied to
SU board
Check for a short circuit using
the POWER connector on the SU
board.
7, 8pin: 24V
3, 4pin: 5V
5, 6pin: 0VL
9, 10pin: 0VP
If there is a short circuit, locate it.
Disconnect the cables from the
SU board one by one to locate
the short circuit.
Replace the short-
circuited component.
(1-1-5) Checking LSI operation
I/F signal from SU board to
OPE board
Check whether signals are output
to the OPE connector on the SU
board.
9pin: Transmission data (sent
from the SU board)
11pin: Clock
13pin: Enabling
15pin: Reset
Signals should be always output
under normal conditions.
Replace the SU board.
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