R46 Circuit Diagram (15/15) - Oki OKIFAX4550 Maintenance Manual

4.12

R46 Circuit Diagram (15/15)

1. Block diagram
R46-PCB circuit diagram (15/15) shown the consists of the following functions:
• Connector CN5 that provides an interface between R46 board and CIS (contact image
sensor).
Figure A.30 (1/2) shows the related signals and block diagram of CIS.
2. Function
One-line picture data is read in the sequence from the scanning unit (CIS) as SIG signal (analog
data) to IC13. Here, the picture data undergoes various kinds of picture processings.
Sensor interface signal output from IC13(LC821033)
• LEDON
• SNSCLK : Scanning sensor drive clock (2.5 MHz)
• MISP
CPU1
SH7034
IC13
CLK
20MHz
LC821033
AIN
Figure A.30 (1/2) Related Signals and Block Diagram of CIS (Contact Image Sensor)
DCK
MISP
VLED
SIG
Figure A.30 (2/2) Signal Timing of CIS (Contact Image Sensor)
41309401TH Rev.4
: LED on/off control signal
: Scanning synchronous signal (1.25 msec)
R51
Transistor
VLED
LEDON
TR5/TR6
GLED
MISP
SCLK
SIG
+5V
-8V
0VA
2.5MHz
1 2 3 4
1.25 msec
1 line
CIS (contact image sensor)
CN5
VLED (+24V)
10
9
GLED
Rod lens array
6 MISP
Shift register &
8 DCK
analog switches
1
SIG
3
+5V
4
-8V
2,5,7
0VA
ON: all the time
2592
LEDs array
sensor
2592 bit
(216 mm)
Amplifier
1 2 3
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