Main Scan Motor Drive Circuit - Epson FilmScan 200 Service Manual

2.3.4.1 Main Scan Motor Drive Circuit

Figure 2-19 is a block diagram of the main scan motor drive circuit.
Table 2-7 indicates the relationship of the input and output excitation phase data of the M54670P (IC13)
motor driver.
Main Scan
Motor
Table 2-7. M54670P (IC13) Input and Output. Motor Excitation Sequence
IN A
Rev. A
A
01A
A
01B
M54670P
(IC13)
B
02A
B
02B
Figure 2-19. Main Scan Motor Drive Circuit
Input
IN B
H L
L H
PHA
PC0
PHB
PC1
PD0
I0 A/B
I1 A/B
Output
A B
H L
L H
OPERATING PRINCIPLES
CPU
HD643003
(IC8)
2-15