OTHER KINDS OF CONTROL
2-P-8
2 UNIT EXPLANATION
(10) 24V DRV (SCDB to FM9)
FM9 (scanner cooling) ON/OFF control signal
[L]: FM9 ON
[H]: FM9 OFF
(11) ADU FAN/1 (ADUSDB to FM10)
FM10 (ADU reverse motor cooling) ON/OFF
control signal
[L]: FM10 ON
[H]: FM10 OFF
(12) FAN1 (DCPS to FM13)
[L]: FM13 ON
[H]: FM13 OFF
(13) SCANFAN_CONT-18 (PRCB to SCDB)
FM9 (scanner cooling) ON/OFF control signal
[L]: FM9 ON
[H]: FM9 OFF
(14) BINF_D
FM12 (developer cooling) ON/OFF control signal
[L]: FM12 ON
[H]: FM12 OFF
[4] Operation Panel Control
The operation panel consists of OB1 (operation
board 1), PAKB (panel key board), and LCD (indi-
cator board). The LCD has a backlight which is
driven by OB IVNB (OB inverter) and touch
switches which correspond to the display mes-
sages.
The operation panel is controlled by the OB1
based on the serial data output from the ICB
(image control board).
1. Operation
a. LED ON operation
The LED on the OB1 (operation board/1) is con-
trolled by sub CPU of OB1 at the command of
ICB (image control board).
b. LCD (indicator board) control
(1) LCD (indicator board) display operation
The LCD (image control board) displays various
information according to the 4-bit parallel data
from ICB (image control board) via OB1 (opera-
tion board 1).
(2) Backlight ON operation
The LCD (indicator board) has a backlight (cold
cathode tube) to facilitate viewing. The backlight
is driven by OB INVB (OB inverter), and con-
trolled by the OB1 (operation board/1).
(3) PAKB (panel key board) control
The LCD (indicator board) has PAKB (panel key
board) to allow you to select an item displayed on
the LCD directly. PAKB is controlled by OB1
(operation board/1).
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OB1
LCD
PAKB
OB INVB
DCPS
ICB
24V1
5V2
S.GND
P.GND
S OUT2
S IN2
/RTS2
/CTS2
/DTR2
/DSR2
MODEL MANUAL REVISED EDITION DATE PAGE METHOD
SERVICE MANUAL Dec. 2003
7155/7165/7255/7272
2-P-6 REPLACEMENT
4
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