Toshiba e-STUDIO 550, Service Manual

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e-STUDIO550/650/810 SCANNING SECTION 6 - 6 JUNE 2002 © TOSHIBA TEC
SCN-MOT
PWA-F-SLG
1
2
3
4
5
6
6
5
4
3 2 1
IC4
IC9
J8
SCNEN-0
SCNDIR-0
SCNRST
SCNREF-0A
SCNMD3-0
SCNMD2-0
SCNMD1-0
SCNCLK-0
1 2 3 4
J9
+36V +36V
Circuit diagram
Scanner CPU
Motor
driver
The motor is rotated by setting the number of pulses.
* 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)
Note: When SCNMD3-0 is “L”, do not change the rotation direction
within 6.25µs before and after the rising and falling edge of
the pulse of SCNCLK-0.
“H” …Normal operation (The motor has been excited.)
“L”…Excitation drive output is forcibly shut OFF (the motor has not
been excited).
Motor wire current value is set in the range of 0 to 2.25 (A)/phase by
applying the analog voltage 0 to 5 (V).
Sets the excitation mode.
Note: Do not change the setting wihin 5µs before and after the
rising and falling edge of the pulse of SCNCLK-0.
Internal circuit of the driver is initialized by setting the motor to “L”
level (pulse interval: 10µs or more).
The motor drive circuit is automatically reset when the power is
turned ON.
SCNCLK-0 CLK input Input
SCNDIR-0
Sets the direction
Input
of motor rotation
SCNEN-0
Cuts OFF the
Input
drive output
SCNREF-0A
Voltage to set value
Input
for the motor current
SCNMD1~3-0 Sets the exicitation Input
mode (1)–(3)
SCNRST Reset Input
Input signals