ADJUSTMENTS
PROCEDURES
16.
Dynamic
Focus
Waveform
Adjustment
€
(1)
Connect
100:1
2pF
Probe
to
the
DEF/HV
PWB
TP5301
(Focus).
(2)
Input
VGA3
(480
line
mode)
crosshatch
pattern.
(3)
Adjust
the
Remote
Control
Scan
Select
to
UNDERSCAN
95%.
(4)
Set
your
scope
to
the
5
mSec
time
and
observe
the
waveform
seen
below.
Adjust
DEF/HV
PWB
VR5301
(V.
Focus
ADJ)
so
that
the
voltage
between
points
A
and
B
equals
250±20Vpk.
(5)
Adjust
VR5302
(H.
Focus
Adj.)
of
the
DEF/HV
PWB
so
that
the
peak
of
the
waveform
of
TP5301
(point
C
of
the
figure)
becomes
1080±20Vpk.
(6)
Remove
the
probe
from
TP5301.
C
1080V
€
I
250V
B
A
OV
17.
Focus
Adjustment
(1)
Input
a
VGA480
inverted
crosshatch
(black
lines
on
white
background).
(2)
Adjust
the
Remote
Control
Scan
select
to
UNDERSCAN
95%.
(3)
Set
the
CONTRAST
and
BRIGHTNESS
in
the
normal
state.
(4)
Set
VR901
(VR
located
to
the
side
of
the
cooling
fan)
to
the
mechanical
center.
(5)
Adjust
FBT
mounted
FOCUS1
control
for
optimum
center
focus
performance.
(6)
Next,
Adjust
VR901
to
balance
top
and
bottom
focus
performance.
€
18.
High-Voltage
Protector
Circuit
Operation
Verification
(1)
Input
NTSC
split
field
signal.
(2)
Turn
the
power
off
using
the
remote
control.
(3)
Short
TP2002
of
the
DEF/HV
PWB
with
27
V
line
(CA
of
R5117,
etc.).
(4)
Press
the
Remote
Control
Power
Button
and,
verify
proper
high
voltage
protect
circuit
operation
as
horizon
tal
oscillation
has
stopped.
(5)
Press
the
front
panel
power
switch
to
turn
the
monitor
off
Remove
the
TP2002
±27V
line
short.
Power
back
on
after
10
seconds
and
verify
normal
operation.
i
€
24
Summary of Contents for PG-2740
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