Xerox OLYMPIA ELECTRONIC COMPACT - 3.11 Motors, driver circuit

This makes the output time of L-level 0.38 ms longer from
the pin 31.
e Position 3 Highest impression
Slide switch contact S1 in the keyboard matrix is closed. The
output time of L-level is 0.59 ms longer.
3.10 Expander circuit
Since the 8039 (IC 4) has only Zl I/O lines, extension of the output
lines port a) ••• 23 (pin 21 ... 24) is effected to the ribbon,
vertical, typewheel and horizontal motors via t~e I/0 expander IC 6 ..
The IC 6 has a programme port with.one line, 4 input and 4 output
ports each with 4 lines. The 4 output ports operate the driver
circuit.
IC
4
4
_..
IC
6
-.-
....
zum Farbbandmotor
to Ribbon motor drive circuit
8039LC
8043C
-i
~
PROG
PROG
zum Vertlkatmotor
to Index motor drive circuit
zum Typenradmotor
P20
P20
4
_,,,,
~
.,.
to Selection motor drive circuit
P21
P21
zum Hortzontalit0tor
P22
P22
P23
P23
i
...
to Carrier motor drive circuit
---.,.
Fig-4
3.11 Motors, driver circuit
L
The stepping motors make movements with following step spaces:
Typewheel positioning
1 full step of motor = 3.6° = 1 spoke of typewheel
Horizontal positioning
1 full
6 fu 11
5 full
4 fu 11
step of motor= 7.5° = 1/60 in= 0.423 mm
steps of motor = 1 pitch 10 cpi = 2.54 mm
steps of motor = 1 pitch 12 cpi = 2. 12 mm
steps of motor= 1 pitch 15 cpi = 1.69 mm
11
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