Konica Minolta 7155 - Page 64

SCANNER SECTION
2-C-6
2 UNIT EXPLANATION
In the case of the 7255/7272
Original read control is performed by ADB (A/D
converter board) and CCD sensor installed in
ADB.
1. Operation
The light reflected by the exposed original is
input to the CCD sensor through the lens. The
analog voltage corresponding to the quantity of
the input light is A/D-converted in the ADB (A/D
converter board), being output to the ICB (image
control board).
a. Original read
The original read timing is as follows:
(1) Platen mode
After lapse of the specified interval since the
exposure unit turned PS61 (scanner HP) OFF.
(2) ADF mode
After lapse of the specified interval since the orig-
inal's leading edge turned PS306 (original con-
veyance) ON.
ICB
ADB
CCD
GND
TG
TG_OUT
CLAMP
A_CLAMP
PRD_KEEP
GND
+LCLK
-LCLK
GND
-RCLK
+RCLK
GND
GND
+TCK
-TCK
GND
GND
SCLK
/SEN
SDI
SDO
GND
-AD_D0
+AD_D0
GND
-AD_D1
+AD_D1
GND
-AD_D2
+AD_D2
GND
-LVDSCLKO
+LVDSCLKO
GND
ADRST
APR
LVDS_PDWN
GND
+5V
+5V
+5V
+5V
+5V
+5V
GND
+12V
+12V
+12V
GND
7272ma2017
4
MODEL MANUAL REVISED EDITION DATE PAGE METHOD
SERVICE MANUAL Dec. 2003
7155/7165/7255/7272
2-C-5-1 ADDITION
4