Konica Minolta 7075/FORCE 75, Service Manual

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WRITE UNIT
M5 DRIVE A
M5 DRIVE B
M5 DRIVE C
b. PRCB output signals
(1) M17 CONT (PRCB to PMDB)
This signal turns ON/OFF M17.
[L]: M17 ON
[H]: M17 OFF
(2) M17 CLK (PRCB to PMDB)
This is a reference clock signal for PLL-control-
ling M17 in PMDB.
c. PMDB input signals
(1) M17 MAG A/A’ (M17 to PMDB)
(2) M17 MAG B/B’ (M17 to PMDB)
(3) M17 MAG C/C’ (M17 to PMDB)
Output signals from the position sensor (mag-
netic sensor) incorporated in M17.
The PMDB detects the position of the motor ro-
tator using these signals, switching among out-
puts, M17 DRIVE A to C.
d. PMDB output signals
(1) DRIVE A to C (PMDB to M17)
M17 drive signals.
M5 DRIVE A to C supplies the corresponding
voltages to M17. Pulses of the voltages
applied to M17 are shown below. The pulse
widths of the PMDB output signals change as
shown below depending on the state of M17
rotation, changing the effective values of the
voltages supplied to M17. Thus, the M17
speed can be controlled.