M1 (Main Motor) Control - Konica Minolta 7020 Service Manual

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DRIVE SECTION
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M1 (Main Motor) Control

3
24VDC
24VDC
PGND
PGND
SGND
5VDC
DCPS
M1 (main motor) is controlled by the PRDB (printer drive
board).
1. Operation
M1 is a brushless motor running on 24 VDC. It drives
the 2nd paper feed, fixing, drum, toner conveyance
screw and toner recycle screw, and also drives part
of the developer agitation screw, IT drive coupling
and the ADU conveyance section.
When IT is installed, M1 drives IT conveyance sec-
tion and also drives the paper exit section via the IT
drive coupling.
M1 includes an internal speed sensor, and utilizes
PLL control to maintain constant speed. Rotational
speed is controlled by a reference clock signal output
by PRDB.
M1 comes ON when the START button is pressed, and
3
goes OFF at a predetermined time interval after PS3
(paper exit PS) (PS2 (fixing exit PS) in the case of
machines other than 7020/25/30/35) goes OFF for
the final copy.
At warmup start, M1 comes ON. only during initial
drum charging.
24VDC
24VDC
PGND
PGND
LOCK SIG M1
M1 CLK
M1 CONT
5VDC
SGND
5VDC
PS2
PS2
SGND
SGND
PS3
PS3
5VDC
PRDB
7020/25/30/35
2-B-2
2. Signals
a. Input signals
(1) LOCK SIG (M1 −> PRDB)
A monitoring signal for the rotation of M1.
Goes [L] when M1 rotation reaches the rated speed.
[H]: Stopped, or rotating at other than rated speed.
[L]: Rotating at rated speed. (PLL: stable)
(2) PS2 (PS2 −> PRDB)
3
Paper fixing unit exit passage detection signal
[H] when paper is detected.
(3) PS3 (PS3 −> PRDB)(Only for 7020/25/30/35)
3
Paper exit passage detect signal
b. Output signals
(1) M1 CONT (PRDB −> M1)
M1 drive control signal.
[L]: M1 ON
[H]: M1 OFF
(2) M1 CLK (PRDB −> M1)
Reference clock for M1 rotation control.