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8-5-9
_
V COM DC Adjustment (RG-5
Board)
Mode
Power
on
Signal
Color
bar
Measurement Point
LCD
screen
Measuring Instrument
Oscilloscope
Adjusting Element
RV912
Specified
Value
Minimum
amplitude of
flicker
waveform
Notes
:
1)
This
adjustment can
be
performed
from
the LCD block rear
with
the unit
assembled.
2) Prevent external light
from getting into
the
COMMON
voltage
adjusting
jig.
Adjusting method
:
1)
Attach the COMMON voltage
adjusting jig sensor
to
the
LCD
screen (place
the
LCD
facing
down
so that no
external
light gets
into
the
sensor)
.
2) Connect
the oscilloscope
to the
COMMON
voltage
adjusting jig.
3) Turn
RV912 and
confirm
that
the
flicker
waveform
in Fig.
8-38
is
output (if
it
is
not.
confirm
the
sensor position and external
light
conditions. then try turning
the BRIGHT control).
4) Adjust RV912
so
as to minimize flicker
waveform
amplitude.
COMMON
voltage
adjusting
jig
(J-6082-024-A)
Oscilloscope
GND
~o
TP
GNO
.._o_o_~J--t'r--+-<>
TP
s
I G
Regulated
DC......_
_ _
___. ............
_,,
power
supply
AV912
(Rear
side
of
sensor
screen
Place the
LCD screen
facing
down
so that
no
external light
gets
into
the
sensor.
Fig.
8-41
.
Minimize
amplitude
I
Fig.
8-42.
8-6.
TIMER SYSTEM ADJUSTMENT
•
Proceed as follows to
set
the TT
check
mode.
which
is required
for timer system adjustment.
1)
Turn
the regulated power
supply
off.
2)
Connect
the TT
check
land
(Fig.
8-43. @) and
TP303
(GND)
with
a
jumper
wire.
3)
Twn the
regulated
power
supply and
the
POWER
switch
on.
4)
Remove
the jumper
wire attached
in
step
2).
5)
Perform
timer
system
adjustment
in
this
condition.
Fig.
8-43.
8
-6-1.
Clock Precision Adjustment (TT-20
Board)
Mode
Stop (power
on)
Measurement Point
Pin
®
of
IC301
Measuring Instrument
Frequency
counter
Adjusting Element
CV301
Specified Value
16.38400 ±
0_
00020
kHz
Adjusting method :
1)
Connect
the
32
kHz
check
land
(Fig.
8-43.
@
)
and
TP303
(GND)
with a jumper
wire
to
set
the
check
mode.
2)
Adjust
oscillation
frequency
to
16.38400 ±
0.00020
kHz with
CV30l.
3)
Remove the
jumper
wire
attached
in
step 1)
.
-
168
-
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