Sharp AQUOS LC-22AD1E, Service Manual

Page: 24 / 111

24
LC-22AD1E
f) Next, select [SECAM TAMP] using the cursor “(
'
)/(
"
)” keys.
• Use the cursor “(
Û
)/(
û
)” keys to manually set [SECAM TAMP] to the same value as previously seen
in PAL TAMP, [25] in the example above.
h) Press the “(
'
)/(
"
)” keys to escape.
i) To exit the adjustment process mode, press the “STANDBY-OFF” or “MAIN POWER-OFF” key.
f) Press the cursor “(
"
)” key and the “OK” key again, and select
[G/A TEST PATTERN 1], on the third page of the [G/A] second
layer on the second page. Then, use the cursor “(
Û
)/(
û
)” keys
to return the setting from [14] to [0].
g) Press the “RETURN” key and the “(
'
)/(
"
)” keys to return to
the first page of the adjustment process.
h) To exit the adjustment process mode, press the “STANDBY-
OFF” or “MAIN POWER-OFF” key.
[G/A] : 3
G/A TEST PATTERN1 0
G/A TEST PATTERN2 0
G/A DATA 0000
G/A DATA WAIT
NTSC PWM FREQ 0D2
PAL PWM FREQ 0D2
NTSC PWM DUTY 0
PAL PWM DUTY 0
Fig. 3-3
Third page of the [G/A] second layer
(4) TAMP adjustment
The screen contrast is adjusted.
a) Bring up the pattern shown in Fig. 4-2 using a signal or an RF signal generator that is producing the
standard colour bars.
b) Refer to the item 2 on page 22 to Entering the adjustment process mode.
This will bring up the first page of the adjustment process, shown in Fig. 4-3.
c) There is a [Y] shown on the bottom of the first page. See if the setting is between [160] and [168]. If it is,
it is OK. However, if the value is outside this range, it is necessary to readjust it.
d) Select [PAL TAMP] using the cursor “(
'
)/(
"
)” keys.
e) Press the cursor “(
'
)/(
"
)” keys and adjust the value of [Y] so that it is between [160] and [168].
(In this example, the value of PAL TAMP is [25].)
WHITE
75%
(WHITE 75%)
Fig. 4-1
White 75% half-colour bar signal
Fig. 4-2
TAMP adjustment pattern (PAL r = 1.00)
_______
_______
_______
PAL TAMP
25
SECAM TAMP 20
AV AMP 20
TAMP L 160
Y READ VALUE
TAMP H 168
_______
_______
_______
PAL TAMP
25
SECAM TAMP 25
_______
_______
Fig. 4-3
First page of the adjustment process
Fig. 4-4
First page of the adjustment process