A3.1.4 E17 Circuit Diagram (Page 4/16) - Oki OKIFAX 5400 Maintenance Manual

A3.1.4 E17 Circuit Diagram
1. Block diagram
The circuit diagram shown on page 4/16 consists of the following function:
• IC6 (A/D converter) and amplifier
• 30 V/24 V conversion circuit
• Connector CN10 that provides an interface between E17 board and CIS (contact
image sensor).
Figure A3.1.4 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 A/D converter (analog/digital converter) of IC6 via amplifier. After conversion
from analog data to 6-bit digital signal (SDT2 - SDT7) under the control of IC6, the picture data
is sent to IEXSEED300 (scanning control LSI) of IC20. Here, the picture data undergoes
various kinds of picture processings.
Sensor interface signal output from IEXSEED300.
• LEDON :
• PDCK
• MISP
• ADCLK :
IC20
IEXSEED
300
SDT2 - SDT7
IC6
A/D converter
30 V/24 V
30 V
conversion circuit
Figure A3.1.4 Related Signals and Block Diagram of CIS (contact image sensor)
40838301TH Rev.1
LED on/off control signal
: Scanning sensor drive clock (1.25MHz)
: Scanning synchronous signal (2.5 msec)
Sampling clock for A/D converter (1.25MHz)
E17
Transistor
VLED
LEDON
TR9/TR10
GLED
MISP
PDCK (1.25MHz)
SIG
Amplifier
+5 V
-8 V
0 VA
24 V
CIS (contact image sensor)
CN10
VLED (+24 V)
10
9
GLED
6 MISP
8 DCK
1
SIG
3
+5 V
4
-8 V
2, 5, 7
0 VA
A3 - 5
LEDs array
Rod lens array
2592 bit (216 mm)
Shift register & analog switches
Amplifier
E17
sensor