ADJUSTMENTS
PROCEDURES
1.
Power
Supply
Check
(1)
Verify
input
voltage
is
120VAC/60Hz.
(2)
Verify
the
following
pCOMA/
PWB
voltages.
DC1
-DCS
=
8.5Vdc,
DC3-DG5
=
27Vdc,
DC4-DC5
=
27Vdc.
(3)
Verify
that
pCOMA/
PWB
DC2-DC5
=
40Vdc.
i
2.
Horizontal
Oscillation
Adjustment
2-1
SUB
PWB
Horizontal
Oscillation
Adjustment
(1)
Input
a
horizontal
frequency
of
50.0
KHz
to
either
RGB1
or
RGB2.
(2)
Short
connector
pins
6
and
4
of
“JA"
of
the
pCOMA/
PWB
(PWC-3839).
(3)
Adjust
VR9001
of
the
DEF
SUB
PWB
(PWC-3856A)
so
that
there
is
one
image.
(4)
Input
the
NTSC
Split
field
pattern
and
adjust
VR9002
(DEF
SUB
PWB)
so
that
there
is
one
image.
(5)
Repeat
steps
(3)
and
(4)
and
verify
proper
15.75
and
50.0kHz
sync
performance.
(6)
Open
the
connector
pins
6
and
4
of
"JA"
of
the
pCOMA/
PWB.
Note:
Shorting
JA
pins
4
and
6
puts
the
horizontal
oscillator
into
Free
Run
mode.
€
2-2
RGB
PWB
Horizontal
Oscillation
Adjustment
(1)
Input
an
NTSC
color
bar
signal
to
CHI
of
your
oscilloscope.
(2)
Connect
CH2’s
probe
to
TP8701
and
TP
GND1.
(3)
Adjust
VR8701
(H-SYNC
FREE
RUN
ADJ)
so
that
CHI
and
CH2
are
in
sync
with
each
other.
Note:
This
is
a
free
run
adjustment
so
do
NOT
input
video
signal
to
monitor
for
this
adjustment.
€
3.
Vertical
Oscillation
Adjustment
3-1
DEF
SUB
PWB
Vertical
Oscillation
Adjustment
(1)
Input
VGA3
(480
line)
to
either
RGB1
or
RGB2
input.
(2)
Short
the
connectors
pins
5
and
4
of
“JA"
of
the
uCOM/V
PWB
(PWC-3839).
(3)
Connect
a
digital
counter,
or
oscilloscope,
to
TP4001
of
the
DEF
SUB
PWB
(PWC-3856A).
(4)
Adjust
VR4001
so
that
TP4001
(DEF
SUB
PWB)
equals
50±0.5Hz.
(5)
Open
connectors
pin
5
and
4
of
"JA"
of
the
pCOM/V
PWB
and
disconnect
the
digital
counter
(or
scope).
#
3-2
RGB
PWB
Vertical
Oscillation
Adjustment
(1)
Set
the
VIDEO
SELECT
SW
(VIDEO
I/O
PWB)
to
the
NTSC
mode.
Note:
Do
connect
the
video
input
for
this
free
run
adjustment.
(2)
Connect
the
oscilloscope
or
frequency
counter
to
TP8702
on
the
RGB
PWB
(PWC-3836).
(Be
sure
to
utilize
the
TPGND1
as
the
ground
for
the
probe.)
(3)
Adjust
VR8702
(FREE
RUN
ADJ)
so
that
TP8702
equals
18.18±0.3mSec.
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16
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Summary of Contents for PG-2740
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