Service manual

BY-PASS TRAY
2-L-2
2 UNIT EXPLANATION
[3] First Paper Feed Control
The 1st paper feed from the by-pass tray takes place as
the result of the transmission of the drive force from M6
(loop roller) to the paper feed roller. SD11 (pick up (by-
pass tray)) moves up and releases the paper feed roller
contacting to the paper after the roller picked up and
fed the first paper to the feed roller side to facilitate
paper feeding.
The above operations are controlled by the PRCB
(printer control board).
1. Operation
a. First paper feed operation timing
Controlled at M6 ON/OFF timings and by M6
rotation direction.
2. Signals
a. Output signals
(1) SD11 (PRCB to SD11)
SD11 drive control signal (bypass tray).
[L]: SD11 ON
[H]: SD11 OFF
(2) M6 DRIVE A, A
(PRCB to M6)
M6 A-phase drive control pulse signal.
(3) M6 DRIVE B, B
(PRCB to M6)
M6 B-phase drive control pulse signal.
Paper size PS1 (PS55)
By-pass
tray
Paper size
detection
VR (VR4)
Paper size
PS2 (PS56)
PRCB
DCPS2
24VDC
24VDC
M6 DRIVE A
M6 DRIVE A
M6 DRIVE B
M6 DRIVE B
M6
24VDC
PGND
24VDC
PGND
SD11
24VDC
SD11 CONT
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