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Epson PX-8 - Page 269

Epson PX-8
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REV.-A
(2)
Adjustment
Check
the
output
signal
from
the
test
connector
(or
the
RDSP signal
of
pin 5
on
CN
1)
with
an
oscilloscope. Turn
the
azimuth
adjustment
screw
clockwise
or
counterclockwise
until
the
peak
position
of
the
wave
is found,
then
adjust
the
azimuth
according
to
the
following
proce-
dure. (For
the
location
of
the
adjustment
screw, see Fig.
6-20.)
1.
Turn
the
adjustment
screw
slightly
in a
counterclockwise
direction
to
deviate
from
the
peak.
2.
Slowly
turn
the
adjustment
screw
clockwise
to
the
peak position.
(Be
sure
to
adjust
the
screw
to
the
peak
position
turning
it
clockwise.)
3. Lock
the
adjustment
screw.
Set
the
oscilloscope
near
the
following
range.
Sweep
DIV.
200
J1S
Reference:
Output
signal
of
pin 7
of
IC4
on
MAP-MC
board.
The signal
wave
form
should be
about
200
mVP-P as
shown
in Fig.
6-19.
G
.....
--I---+-I----t~__1l--1l---'t--t___t__f_-t-
Fig.6-19
6.6.3
Tape
Speed
(2.4
cm/s)
Make sure, by using
the
AZIMUTH
test
tape,
that
the
output
is
within
a range
of
3 kHz ±
15
Hz
(as
directly
measured
with
a
frequency
meter).
Make
sure
that
the
signal
at
pin 3
of
IC2 on
the
MAP-MC
board is in a
frequency
range
within
400
Hz ± 4 Hz
(a
pulse cycle range
from
2.57
to
2.44
ms).
If
either
deviates
from
the
specified range, readjust
the
tape speed
with
variable resistor
VR 1
on
the
board.
Location
Azimuth
adjustment
screw
(Located
right
beneath the azimuth
hole cover.)
Fig.
6-20
6-14

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