Xerox OLYMPIA ELECTRONIC COMPACT - Photo Interrupters

The power control for motors is effected from the port 1 of CPU to
the basis of Tr 8 .•• Tr 11 via inverting in the transistor arrey
TRA 1. Since the horizontal motor needs 3 different voltages, Tr 7
is activated exclusively for this motor.
During motor functioning the operation voltage switches conti-
nuously between VHH and VHL via the transistors Tr 7 ... Tr 11
( See F i g • 5 ) •
Motors
Typewheel motor
Horizontal motor
Vertical motor
Ribbon motor
Operation voltage
VHH
36 v
36 v
36 v
36 v
VHL
12 v
12 v
Fig. 6
6 v
6 v
Keeping voltage
0 v
6 v
0 v
0 v
-12v
( -6V)
3.12 Photo interrupters
L
The basic positions of the step motors except the vertical motor
are detected by the CPU via the photo interrupters.
Motor
Typewheel motor
Horizontal motor
Ribbon motor
Photo interrupter
PH 3 on the printer head
PH 2 on the printer PCB
PH 1 on the printer PCB
When printer head is pulled backward for ejection of the typewheel,
its arm releases the reset crank and the reset plate leaves the
PH 2 (See Drawing B).
13 I
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