Minolta EPI 054 User Manual page 119

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL
98.04.24
The Scanner starts the scan motion as a Scan signal is output from the Master Board. At
the start of a scan motion and other heavy load conditions, the Scanner Motor requires a
large amount of current. The Current 1 or 2 signal from the Motor Drive Board is selected
accordingly to vary the amount of current supplied to the Scanner Motor.
The Current signal selection timing is controlled by software.
Current 1
Current 2
When the scan
Operation speed reaches a
given level.
On receiving the Scan signal, the Motor Drive Board applies motor drive pulses, which are
out-of-phase with each other, to the Scanner Motor. The motor speed is varied by changing
the width of the pulses applied to the Scanner Motor.
Control Signal
PWB-F (23 cpm Copier)
M5
PWB-E (15/18 cpm
Scan Signal
Copier)
M5
PWB-F (23 cpm Copier)
Current
PWB-E (15/18 cpm
Switching
Copier)
Signal 1
M5
PWB-F (23 cpm Copier)
Current
PWB-E (15/18 cpm
Switching
Copier)
Signal 2
Control Signal
PC81 PWB-A PJ17A-7B
H H
H L
At scan start and dur-
ing scan decelera-
tion.
Energized Deenergized WIRING DIAGRAM
L
L
L
Blocked Unblocked
L
M-25
L
H
At return start and
during return motion.
H
H
8-D/8-H
H
WIRING DIAGRAM
H 11-A