Sharp LC-22AD1E Service Manual page 24

LC-22AD1E
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.
(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.
WHITE
75%
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].)
_______
_______
_______
PAL TAMP
SECAM TAMP
AV AMP
TAMP L
Y
TAMP H
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.
Fig. 4-1
White 75% half-colour bar signal
25
20
20
160
READ VALUE
168
Fig. 4-3
First page of the adjustment process
[G/A] : 3
G/A TEST PATTERN1
G/A TEST PATTERN2
G/A DATA
G/A DATA
NTSC PWM FREQ
PAL PWM FREQ
NTSC PWM DUTY
PAL PWM DUTY
(WHITE 75%)
Fig. 4-2
TAMP adjustment pattern (PAL r = 1.00)
_______
_______
_______
PAL TAMP
SECAM TAMP
_______
_______
Fig. 4-4
First page of the adjustment process
24
0
0
0000
WAIT
0D2
0D2
0
0
Fig. 3-3
Third page of the [G/A] second layer
25
25