Main Motor Drive Circuit - Toshiba DP120F Service Manual

3.9 Main Motor Drive Circuit

The main motor drive circuit consists of the I/OP-2 GA (IC48) and other peripheral devices. It
drives the DC motor connected to CN3 on the Mother PBA to drive the rollers and transport
paper.
The I/OP-2 GA causes the MMON signal to be HIGH to turn on Q4. This allows voltage to be
applied to the driver in the main motor for driving the motor.
When the drive signal output from the driver synchronizes with the rotation, the main motor
causes the MMSYNC signal to be HIGH and outputs it to the I/OP-2 GA. This detects that the
rotation of the main motor has been stabilized.
Signal Name Type
MMON O
MMSYNC -
DP120F/DP125F Circuit Description
Fig. 7-3-9
Active
H Main Motor Drive Signal
H Main Motor Drive Synchronizing Signal
Description
7-42
07-03-09
Destination
Q4
I/OP-2 GA
March 2000 © TOSHIBA TEC