45762101TH Rev.1
2-36
2. TROUBLESHOOTING PROCEDURES
2.5.5.(1) LCD Display Trouble
(1-1) LCD displays nothing
Check item Checking Action in case of fail
(1-1-1) Checking fuse
Fuse on SU board (MSU) Check whether F6 or F8 has
blown.
Replace F6 or F8 or SU
board (MSU).
(1-1-2) Checking connections
Connection between low-
voltage power supply unit and
SU board (MSU)
Make sure the low-voltage power
supply unit is connected to the
POWERCN connector on the SU
board (MSU) 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 (MSU)
Replace the cable with
a good cable.
Connection between SU
board (MSU) and operation
panel
Make sure the 16-pin FFC
is connected to the OPE2
connector on the SU board (MSU)
properly.
Make sure the 16-pin FFC is
connected to the CN1 connector
on the OPE board (OPM-2)
properly.
Check whether the cable
connector is half-connected or
tilted.
Connect the cable
properly.
FFC connecting SU board
(MSU) to OPE board (OPM-2)
Check for broken wires using a
tester.
Check visually whether the
sheath peels.
Replace the cable with
a good cable.
Check item Checking Action in case of fail
(1-1-2) Checking connections
Connection between SU
board (MSU) and CU/PU
board
Make sure the 16-pin FFC
is connected to the OPE1
connector on the SU board (MSU)
properly.
Make sure the 16-pin FFC
is connected to the OPE
connector on the CU/PU board
(MRM) properly.
Check whether the cable
connector is half-connected or
tilted.
Connect the cable
properly.
FFC connecting SU board
(MSU) to CU/PU board
(MRM)
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.
5VS and 24V power supplied
to SU board (MSU)
Check the 5VS power at 1 pin
and 24V power at 3, 4 pin of the
POWERCN connector on the SU
board (MSU).
Replace the low voltage
power supply or CU
Board (MRM).
5VOPE and 3.3VSF power
supplied to OPE board (OPM-
2)
Check the 5VOPE power at 16pin
and 3.3VSF power at 14pin of the
CN1 connector on the OPE board
(OPM-2).
Replace the SU board
(MSU).
(1-1-4) Checking for short circuit of power supply
5V and 24V power supplied to
SU board (MSU)
Check for a short circuit using
the POWER connector on the SU
board (MSU).
3, 4pin: 24V
1pin: +5VS
2, 5, 6pin: 0V
If there is a short circuit, locate it.
Disconnect the cables from the
SU board (MSU) one by one to
locate the short circuit.
Replace the short-
circuited component.
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