Toshiba e-studio550 Service Manual page 90

PWA-F-SLG
SCNREF-0A
SCNEN-0
SCNDIR-0
Scanner CPU
SCNCLK-0
SCNMD1-0
SCNMD2-0
SCNMD3-0
IC9
Input signals
SCNCLK-0 CLK input
Sets the direction
SCNDIR-0
of motor rotation
Cuts OFF the
SCNEN-0
drive output
Voltage to set value
SCNREF-0A
for the motor current
SCNMD1~3-0 Sets the exicitation Input
mode (1)–(3)
SCNRST Reset
e-STUDIO550/650/810 SCANNING SECTION
SCNRST
Motor
driver
IC4
J9
1
Circuit diagram
The motor is rotated by setting the number of pulses.
Input * The internal circuit of the motor driver works at the rising and falling
edge of pulse.
The direction of the motor rotation is determined by the setting level
of signal
"H"...Clockwise direction (as seen from the output shaft)
"L"...Counterclockwise direction (as seen from the output shaft)
Input
Note: When SCNMD3-0 is "L", do not change the rotation direction
"H" ...Normal operation (The motor has been excited.)
"L"...Excitation drive output is forcibly shut OFF (the motor has not
Input
been excited).
Motor wire current value is set in the range of 0 to 2.25 (A)/phase by
Input
applying the analog voltage 0 to 5 (V).
Sets the excitation mode.
Note: Do not change the setting wihin 5µs before and after the
Internal circuit of the driver is initialized by setting the motor to "L"
level (pulse interval: 10µs or more).
Input
The motor drive circuit is automatically reset when the power is
turned ON.
J8
1
2
3
4
5
6
3 4
2
within 6.25µs before and after the rising and falling edge of
the pulse of SCNCLK-0.
rising and falling edge of the pulse of SCNCLK-0.
6 - 6
SCN-MOT
6
5
4
3 2 1
JUNE 2002 © TOSHIBA TEC