OKIDATA OKIMATE 20 Technical Service Data

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Brand: OKIDATA

Category: Printer

Type: Technical service data

Model: OKIDATA EN3211 , OKIDATA OKIMATE 20

Pages: 39

Download OKIDATA EN3211 Technical service data

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SCHEMATIC
NOTES
rrtn
Chassis
ft—
Circuitry
not
used
in
some
versions
Circuitry
used
in
some
versions
e
See parts I i st
+
Ground
Voltages measured with digital meter.
Waveforms and voltages are
taken from ground,
unless noted otherwise.
Voltages, waveforms
and logic readings taken
with Printer running in Self-Test mode.
Waveforms taken
with triggered scope and
Sweep/Time
Switch in Calibrate
position,
scope
input set for DC coupling
on
"0"
reference
voltage waveforms.
Switch to
AC input to
view
waveforms
after DC reference
is
measured
when
necessary. Each waveform
is 7.5cm width with
DC
reference voltage
given at the bottom line
of
each waveform.
Item numbers in rectangles
appear in the align-
ment/adjustment
instructions.
Supply
voltage
maintained as shown at input.
Controls adjusted
for normal
operation.
Terminal identification
may
not
be
found on
unit.
Capacitors are 50
volts or less,
noted.
unless
Electrolytic capacitors
are
50
volts or
less,
20? unless noted.
Resistors are
1/2W
or
less,
%
unless
noted.
Value
in
C)
used in some versions.
Measurements taken
with switching as
follows,
unless noted:
SW2 Darkness set to
Maximum Darkness
DIP
Switch SW1:
1, 2, 5,
ON
3, 4,
6
OFF
DIP Switch
SW2:
AI I Off
Logic Probe Display
L=Low
H=High
P=Pulse
*=0pen
(No
I
i
ghts On)
(1) Probe indicates High when Print
Head is
at Home
position.
(2) Probe
indicates High when Print
Head is
not printing.
(2)
Probe indicates Low when Print
Head
is
at
Home
position.
(4)
Probe indicates Low when Print
Head is
not printing.
g
(5) Probe
indicates Low when Print
Head isQ
not
moving.
D
(6) Probe indicates
pulse while
Print Head
isJU
returning to Home position.
m
z
o
>
O
H
Til
S
19