The First Line Is Black Display In Lcd - Oki C5650 Maintenance Instructions Manual

(1-2)The first line is black display in LCD

Confirmation Items
(1-2-1) Check of connections
Connection between low-
voltage power supply unit and
PU PCB
Cord ASSY interconnecting
the low-voltage power supply
unit and the PU PCB
Connection between PU PCB
and operator panel PCB
FFC interconnecting the PU
PCB and the operator panel
PCB.
(1-2-4)Check of LSI operation
I/F signal from PU PCB to
operator panel PCB
I/F signal from operator panel
PCB to PU PCB
43827101TH Rev.2
Confirmation Tasks
Check to see if the cord from the lower-voltage power supply is
connected properly to the POWER connector of the PU PCB.
Check for any incomplete connection or skew insertion.
Check to see if the cord has any wire breakage.
Check to see if the cord has any peel-off of the covering.
Check for any fault in the cord ASSY, such as dislocated wire,
etc.
Check to see if the wires are properly connected on a 1-pin to 1-
pin basis.
Check to see if the 7-pin FFC is properly plugged into the OPE
connector of the PU PCB.
Check to see if the 7-pin FFC is properly plugged into the CN
connector of the operator panel PCB.
Check for any incomplete connection or skew insertion.
Check for wire breakage with a circuit-tester. Also, check
visually for peel-off of the covering.
Check to see if there is signal output through the OPE
connector of the PU PCB
Pin 1: CLK
Pin 4: Transmitting data (Transmission of PU PCB)
Pin 6: CLR
The signal is permanently output if the PCB is normal.
Check to see if there is signal output through the OPE
connector of the PU PCB
Pin 3: Receiving data (Reception of PU PCB)
The signal is permanently output if the PCB is normal.
Oki Data CONFIDENTIAL
Action at NG
Redo the insertion of
the cord properly.
Replace the cord with a
normal one.
Redo the insertion of
the cord properly.
Replace the FFC with a
normal one.
Replace the operator
panel PCB.
Replace the operator
panel PCB.
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