Toshiba 4580, Руководство по обслуживанию

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6570/5570 ADF 16 - 42 Mar. 1999 © TOSHIBA TEC
16.10.4 Pulse motor drive circuit
This item describes the feed motor drive circuit. As the feed motor, transport motor and reversal motor
share the same circuit configuration, a description of the transport motor and reversal motor circuits is
omitted in this item.
This circuit controls start/stop, direction of rotation and motor current of drive motor operation.
2 phase excitation/1-2 phase excitation can be selected by inputting the D/A converter output voltage
(either of two values 00H or FFH) to pin 8 (MODE) of IC8. (On this document feeder, the feed and
reversal motors are fixed to 1-2 phase excitation, and the transport motor is fixed to 2 phase excitation.)
The rotating speed of the motor and direction of rotation can be controlled by inputting the drive clock
signal (CLOCK) and rotation direction signal (CWB). When the CPU sets the enable signal to Low, pin 6
(RESETB) of IC8 turns Low, all outputs of the drive IC are turned OFF regardless of the state of other
signals.
The motor current value is set by dividing the D/A converter output voltage by R73 and R59 and inputting
the resultant voltage to pin 12 (Vref) of IC8. The motor current value can be set to any value by varying
the D/A converter output value.
16.10.5 Solenoid drive circuit
This circuit limits actuation and release of the reversal solenoid. When the CPU output port is Low level,
pin 3 of IC3 turns Low and pin4 of IC3 turns High. Q12 then turns ON to actuate the solenoid. The
solenoid drive signal is a PWM signal. When the solenoid starts to actuate, the solenoid actuates at its
maximum torque at 100% duty. After actuation is completed, the duty ratio is reduced to hold actuation
while heating of the solenoid is held in check.
TP2
R65
R73
1
MODE
2
R97
1
CLOCK
2
R98
1
1
1 1 1 1 1
2
CWB
2
R99
R59
TP3
1
2
C7
TP4
1
2
C8
TP5
1
2
C9
TP6
GND
1
2
1
2
C21 1
2 1
1
10
2
8
9
7
12
6
11
1
A
AB
BB
B
5
4
3
2
MODE
CLOCK
CWB
Vref
RESETB
GND
SP
2 1
+
2
C81 C80 C79
PGND
C78 C39
4
3
2
1
5
6
C69
C24
C68
1
2
1
2
1
2
1
A CN8.4
*A CN8.3
B CN8.2
*B CN8.1
PM+24 CN8.5
PM+24 CN8.6
Feed motor
2
1
RESETB
2
1
D/A
2
+5V
PM+24V
VDD
ICB
C1
1
+
3
1
1
2
4
A Y
IC3.2
TP6
+5V
CPU
R105
1
2
R104
SGND
1 2
R100
+24V
3
4
CN7.3
*RSOL CN7.4
Reverse solenoid
+24V
D4
D12
1
1
G
2
3
2
D
S
A K
PGND