45762101TH Rev.1
2-58
2. TROUBLESHOOTING PROCEDURES
2.5.5. (12) Option unit cannot be recognized.
(12-1) Option try unit cannot be recognized.
Check item Check operation
Actions for NG
results
(12-1-1) Option try board
Option tray unit Check that it is Option Tray which can be used in
MB4xx.
Replace it with
an appropriate
option tray unit.
(12-1-2) Check the system connection
Connection
between the CU/PU
board and the
option tray board
(GOG PCB)
Check that the cord between the 2ND connector
of the CU/PU board and the option tray board is
properly connected.
Correct the
connections.
Square connector
connecting the
option tray unit with
the main unit
Check if any foreign material exists in the
connecting portion of the square connector.
Remove the
foreign material.
Square connector
connecting the
option tray unit with
the main unit
Is the terminals of the square connector
damaged?
Replace the
connector.
(12-1-3) Check the control signals.
Control signal that
is output from the
CU/PU board to the
option tray board
(GOG PCB)
Check the control signals that are output from the
2ND connector
of the CU/PU board.
Pin 6: TXD (PU -> 2nd)
Pin 5: RXD (2nd -> PU)
Replace the
CU/PU board.
2.5.5. (13) LED head cannot be recognized. (Error code: 134)
(13-1) Service call 134 (LED HEAD Missing)
Check item Check operation
Actions for NG
results
(13-1-1) Check the system connection
Connecting
condition of the CU/
PU board connector
and the head
connector
Check the connecting condition of the FFC by
the visual inspection.
Correct the
connection
to the normal
connecting
condition.
Head FFC Remove the head FFC from the printer. Check
if any open-circuit or peeling-off of sheath has
occurred or not throughout the cable.
Replace the head
FFC or CU/PU
board.
Conduction of the
fuse on the CU/PU
board
Check that measurements taken at both ends of
each capacitor CP7 show 5V. (See section 2.6.)
Or, instead of the above, check if each fuse F502
is open or not.
Replace the
CU/PU board.
To Next Page
Loading...
