ADJUSTMENTS
PROCEDURES
13.
Audio
Circuit
Adjustment
(1)
Input
a
sine
wave
of
1
KHz,
0.5
V
rms
to
the
video
1
L-ch
audio
input
terminal.
(A
video
signal
is
not
required
to
perform
this
adjustment).
(2)
Select
the
video
1.
(3)
Connect
the
8f2
dummy
load
(10
W
rating
or
more)
to
the
external
speaker
terminals
(L-ch
and
R-ch).
(4)
Set
the
speaker
INT/EXT
SW
to
the
EXT
position.
(5)
Set
the
VOLUME
key
so
that
both
end
voltages
of
the
dummy
load
(L-ch)
become
about
5
V
rms
(about
14
Vp-p,
about
3
watts).
(6)
Adjust
the
VR301
(Input
Level
Adj.
on
the
pCOMA/
PWB)
so
that
both
end
voltages
of
the
dummy
load
(R-
ch)
become
the
same
as
the
voltage
set
in
(5).
Note:
The
difference
between
the
L-ch
and
R-ch
shall
be
the
deviation
within
1
Vp-p
(within
7%).
14.
Raster
D/A
Controi
Setting
(1)
Input
an
NTSC
crosshatch
pattern.
(2)
Set
the
CONTRAST
and
B-LEVEL
to
the
center,
using
the
remote
control.
(3)
Connect
the
wire
between
pin
1
and
pin
7
of
connection
JB
on
pCOMA/
PWB
(PWC-3839)
[TEST
MODE].
(4)
Set
the
monitor
to
the
OVERSCAN
mode
using
the
scan
select
key
of
the
remote
control.
(5)
Set
the
CONTRAST
of
the
remote
control
to
the
to
MAX
position
using
the
CONTRAST
key.
(6)
Adjust
the
video
signal
to
the
center,
overscan
7±2%
using
the
H
WIDTH
UP/DOWN
key,
V
HEIGHT
UP/
DOWN
key,
H
POSITION
LEFT/RIGHT
key,
and
V
POSITION
UP/DOWN
key.
(7)
Next,
press
the
Remote
Control
NORMAL
key
to
store
these
new
values.
(8)
Next,
input
the
PAL
monoscope
signal
and
repeat
steps
(2)
to
(7)
by
setting
the
Video
I/O
PWB
NTSC/PAL
Switch
accordingly.
Note:
Either
Videol
or
Video2
can
be
used
for
this
step.
(9)
Next,
Input
VGA2
(350
line
mode)
(10)
Set
the
monitor
into
the
UNDERSCAN
mode
using
the
Scan
Select
key
of
the
remote
control.
(11)
Make
adjustment
so
that
this
RGB
image
is
centered
at
95±2%
scan,
just
as
in
the
case
of
the
video
signal.
(12)
Next,
press
the
Remote
Control
NORMAL
key
to
store
these
new
values.
(13)
Perform
steps
(9)~(12)
for
each
of
the
following
inputs:
VGA2,
VGA3,
MACH
and
VESA
(8x6
@
72Hz
and
10x7
@
60Hz).
Note:
Use
the
Remote
Control
V-Position
Control
to
move
image
up
and
down
to
minimize
trapezoidal
distortion.
(14)
Upon
completion
of
(1)~(13),
connect
the
wire
between
pin
1
and
pin
7
of
connector
JB
on
pCOM/V
PWB
(PWC-3839)
[TEST
MODE],
and
connect
the
wire
between
pin
2
and
pin
5
of
connector
JB
[AUTO
Transfer
Mode].
Factory
Preset
data
is
copied
into
User
memory
area.
(15)
After
two
seconds,
disconnect
the
wire
between
pin
2
and
pin
5
of
connector
JB,
and
between
pin
1
and
pin
7
of
connector
JB.
Table
[Preset
Signal
Timing
Chart]
Video
A
A
D
Sync
i_j
B
A
21
Summary of Contents for PG-2740
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