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B. Solenoid drive circuit
[a] Paper feed solenoid (DFSOL), reverse solenoid (DRSOL) drive circuit
This circuit drives the weight plate which presses the bundle of documents on the tray, the paper feed solenoid which drives the paper feed section
shutter, and the reverse solenoid which drives the reverse guide to lead an document to the reverse path when reversing. The basic composition is
the same. The drive signal (ON at HIGH) from the gate array is inputted to the gate of FET (Q14, Q15).
The ON duty of the drive signal can be varied from 0 to 100% (255 steps). The frequency, however, is 20kHz.
G/A
(IC7)
15
PWM2
14
PWM1
C. Other circuit
[a] EEPROM (IC3) circuit
This circuit serves as a memory to save the sensitivity data of the reflection type sensors, the adjustment values such as the document set position
on the document table, and the counter values such as the number of documents passed. Data communication with the CPU (IC11) is performed
with the 3-wire serial interface.
The saved data are maintained even when the power is turned off.
IC3 1 pin is the chip select pin, which is driven to HIGH when data communication is performed.
2 pin is the serial lock pin, and the serial data are transmitted in synchronization with the clock inputted to this pin.
3 pin is the input pin of serial data from the CPU. 4 pin is the output pin of serial data from IC3.
D1, R50, and C1 form a circuit which keeps the power of IC3 at a constant level even when a sudden power drop occurs during data writing.
SS14
TP28
Q14
2SK1726
R88
1.0K
PGND
SS14
TP36
Q15
2SK1282-Z
R82
1.0K
PGND
Solenoid drive circuit
+5V
D1
E2ROM+5V
R49
R50
10
100K
IC3
R4
C1
4
DO
1
R3
*CS
100µ F
6
2
R2
CLK
ORG
7
3
R1
NU
DI
93LC46TSN
EEPROM circuit
+24V
173981-7
D8
+24V
CN8-4
DRSOL CN8-5
FD+24V
DF1B-9P-2^5DSA
D7
+24V
CN5-4
DFSOL CN5-3
+5V
D3
R24
22K
10K
22K
22K
22K
R8
R42
R41
10K
10K
10K
10 – 7
Reverse
DRSOL
solenoid
Paper feed
DFSOL
solenoid
CPU
(IC11)
60
P74/ANI4
51
P14
52
P15
50
P13
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