Toshiba e-STUDIO2500c, Service Manual, Page: 297 / 402

13
May 2006 © TOSHIBA TEC e-STUDIO2500c/3500c/3510c TRANSFER UNIT
13 - 9
13.5 Electric Circuit Description
13.5.1 Transfer belt motor control circuit
The transfer belt motor is a stepping motor driven by the control signal output from the ASIC on the
LGC board and rotates the drive roller.
The transfer belt motor is driven by the pulse signal (TBMA, TBMB, TBMC, TBMD) output from the
motor driver. These pulse signals are formed based on the reference clock (TBMCK) and output only
when the enable signal (TBMEN) is a high level. Also, the rotation speed or direction of the motor can
be switched by changing the output timing of each pulse signal.
Fig. 13-3
Control signal
* CW: Clockwise rotation, CCW: Counter clockwise rotation viewing from the axis
Signal Function
Status
High level Low level
TBMCK Reference clock --- ---
TBMEN Enable signal ON OFF
TBMDIR Rotation direction signal CCW CW
TBMRST Reset signal Normal operation Reset
IC41
ASIC
TBMEN
TBMCK
Transfer belt
motor
TBMRST
TBMCW
TBMB
TBMA
TBMD
TBMC
IC7
Motor driver
LGC board
+24VD2 +24VD2 +5.1VB
SG PG
IC28