The First Line Is Black Display In Lcd - Oki C3200n Service Manual

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

Confirmation Items
(1-2-1)Confirm connection systems
Connecting the low voltage
power unit with a PU board
(PRN PCB)
Cord Assembly connecting
the low voltage power unit
with a PU board (PRN PCB)
Connecting a PU board
(PRN PCB) with an operation
panel board (PRP PCB)
FFC connecting a PU board
(PRN PCB) with an Operation
panel board (PRP PCB)
Operation Panel Board
(PRP PCB)
(1-2-2)Confirm the power systems
3.3V power is offered to a PU
board (PRN PCB)
(1-2-3)3.3V power short
3.3V power which is offered to
PU board (PRN PCB)
(1-2-4)Confirm the LSI operation
I/F signal to the operation
panel board (PRP PCB) from
PU board (PRN PCB)
I/F signal to PU board
(PRN PCB) from the
operation panel board
(PRP PCB)
42615101TH Rev.8
Confirmation Tasks
Confirm that a cord is correctly connected to POWER connector
of the PU board (PRN PCB) from low voltage power.
Check half connection or incomplete plug-in.
Check if it is disconnected.
Confirm that the cover is not removed.
Confirm cord assembly defects such as a lack of line materials.
Confirm that a line material supports the connection1pin-1pin.
Confirm that 9-pole FFC is correctly connected to OPE
connector of PU board (PRN PCB).
Confirm that 9-pole FFC is correctly connected to CN connector
of PU board (PRN PCB).
Check half connection or incomplete plug-in.
Check a disconnection with a tester. Confirm that the cover is
not removed by eyes.
Confirm whether to use a board of C5300/5100 (RSP PCB) for
the operation panel board.
Check 3.3V power with POWER connector 10,11,12pin of the
PU board (PRN PCB).
Confirm a short with POWER connector of the PU board.
10,11,12pin:3.3V
13,14,15,16,17pin:0VL
Perform a short check by plugging off LED head I/F cord from
CU board.
Perform a short check by separating CU board from PU board.
Confirm that a signal is outputted to OPE connector of PU board
(PRN PCB).
3pin:CLK
6pin: Sending data (Sending of PU board)
8pin:CLR
The signal is outputted all the time in a normal situation.
Confirm that a signal is outputted to OPE connector of PU board
(PRN PCB).
5pin:Receive data (Reception of PU board)
The signal is outputted all the time in a normal situation.
Oki Data CONFIDENTIAL
Action at NG
Plug in the cord
correctly.
Change it to a correct
cord.
Plug the cord correctly.
Exchange to a normal
FFC.
Exchange to
C5400/5200 board.
Exchange the low
voltage power.
Exchange the LED
head, CU board or PU
board.
Exchange the PU
board (PRN PCB).
Exchange the
operation panel board
(PRP PCB).
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