Oki MB461MFP, Maintenance Manual

Page: 233 / 302

Oki Data CONFIDENTIAL
44871001TH Rev.6
8-41
8. TROUBLESHOOTING PROCEDURES
Check item Checking Action in case of fail
(2-1-2) Confirmation of the power switch LED
Power Switch LED Confirm whether the LED is off.
If the LED blinks rapidly, the
number of blinking times in a
cycleshows an error. The timing
of blinking rapidly is shown in the
below figure Replace either of the
power supply unit, the
CU board (98M), SW-
Assy (Front), the cables
connected to the CU
board and power supply
unit or the cables
connected to the CU
board and SW-assy.
In case of 2, 4, 8 or 10
times of LED blinking
rapidly: Replace either
of the power supply unit,
the CU board (98M),
the cables connected
to the power supply unit
and the CU board.
In case of 3, 6 or 9
times of LED blinking
rapidly: Replace the CU
board (98M).
Check item Checking Action in case of fail
(2-1-3) Checking connections
Connection between low-
voltage power supply unit and
CU/PU board (98M) Make sure the low-voltage power
supply unit is connected to the
POWER connector on the CU/PU
board (98M) 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 CU/PU board (98M) Replace the cable with
a good cable.
Connection between low-
voltage power supply unit and
SU board (MHE) Do the checking as described in
(1-1-2). Refer to (1-1-2).
Cable assembly connecting
low-voltage power supply unit
to SU board (MHE)
Connection between CU/PU
board (98M) unit and SU
board (MHE)
Cable assembly connecting
CU/PU board (98M) to SU
board (MHE)
1.0 sec lighting
(No blinking)
A cycle
…
One time blinking (2.5Hz)
ON times 250mS
OFF times 150mS
N times blinking
ON
OFF
Rapid blinking of the LED