Electric Circuit Description - Toshiba e-STUDIO2500c Service Manual

6.5

Electric Circuit Description

6.5.1 Scan motor control circuit
The scan motor is a stepping motor driven by the control signal output from the scanner CPU on the
SLG board and drives carriage-1 and -2.
The scan motor is driven by the pulse signal (SCNM-A, SCNM-AB, SCNM-B, SCNM-BB) output from
the motor driver. These pulse signals are formed based on the reference clock (MOTCLK) and output
only when the enable signal (MOTEN) is a low level. Also, the rotation speed or direction of the motor
can be switched by changing the output timing of each pulse signal.
SLG board
MOTCLK
MOTEN
IC15
MOTDIR
Scanner CPU
generation circuit
Control signal
Signal
MOTCLK Reference clock
MOTEN Enable signal
MOTDIR Rotation direction signal
MOTRST Reset signal
* CW: Clockwise rotation, CCW: Counter clockwise rotation viewing from the axis
e-STUDIO2500c/3500c/3510c SCANNER
MOTRST
Reset signal
Function
+24VMT +24VMT
(+24VD4) (+24VD4)
+5.1VB
IC1
Motor driver
SG +24VMTGND
(PG)
Fig. 6-8
High level
---
ON
CCW
Normal operation
6 - 8
SCNM-A
SCNM-AB
Scan motor
SCNM-B
SCNM-BB
Status
Low level
---
OFF
CW
Reset
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