Oce 3121 Technical & Service Manual page 719

Stapling wait position (manual stapling)
4
If copies are made in sort mode and outputs are stapled manually, the guide bar
is held in wait position at a point 'paper size + 8 mm' while bins are shifted.
Controlling the motor M4
Motor M4 is a 2-phase stepping motor. Pulse signals cause the guide bar to
move to a specific position *. The signals represent a paper size and are gener-
ated by the CPU on the tray control PBA.
*See "Controlling the Guide Bar Position."
The 5V supply serves as a retention current used to keep the guide bar station-
ary.
J4-13
-11
-9
A A
-10
B
-12
M4
-8
B
Guide bar
swing motor
ed.1
8 mm
8mm
Tray controller PCB
5V
24VPA
24VPA 5V
Motor driver
(Q3)
GBMON: Guide bar swing signal
GBMA: Phase A excitation signal (pulse signal)
GBMB: Phase B excitation signal (pulse signal)
Q 7
G B M O N
G B M A
Micro-
processor
G B M A
G B M B
G B M B
21 Sorter 569