Read Sharp XV-C20E (serv.man3) Service Manual online
18
XV-C20E
No.
Adjustment Item
Adjustment Conditions
Adjustment Procedure
16
Brightness
adjustment
(DAC) (gamma
correction off)
adjustment
(DAC) (gamma
correction off)
Note :
After this
adjustment, go
back to Item 15
"Gain adjustment".
Readjust the gain
level.
adjustment, go
back to Item 15
"Gain adjustment".
Readjust the gain
level.
1. Receive the 10-step pattern signal.
2. Connect the dual-beam oscilloscope
between pin (2) [pin (1) for red, pin (3)
for blue] of P4303 and GND.
for blue] of P4303 and GND.
3. Press S2001 to call up the ADJ IN
mode and select the following subject.
Group : VIDEO 1
Subject : BRIGHT(G), R-BRT, B-BRT
• Using the
'
and
"
keys, adjust the
white-to-white level difference of the
waveform to 2.2+0.1/-0.15 Vp-p.
waveform to 2.2+0.1/-0.15 Vp-p.
17
Gamma
adjustment
(DAC) (gamma
correction off)
adjustment
(DAC) (gamma
correction off)
1. Receive the NTSC 10-step pattern
signal.
2. Connect the dual-beam oscilloscope
between pin (2) of P4303 and GND.
3. Press S2001 to call up the ADJ IN
mode and select the following subject.
Group : VIDEO 4
Subject : RGB GAM1, RGB CTR1
4. Connect the dual-beam oscilloscope
between pin (1) of P4303 and GND.
5. Press S2001 to call up the ADJ IN
mode and select the following subject.
Group : VIDEO 4
Subject : R GAM1, R CTR1
6. Connect the dual-beam oscilloscope
between pin (1) of P4303 and GND.
7. Press S2001 to call up the ADJ IN
mode and select the following subject.
Group : VIDEO 4
Subject : B GAM1, B CTR1
• Using the
'
and
"
keys, adjust the
second-tone level to 4.2±0.1 Vp-p
and the black level to 3.0±0.1 Vp-p.
and the black level to 3.0±0.1 Vp-p.
18
SID signal level
adjustment
adjustment
1. Receive the NTSC 10-step pattern
signal.
2. Connect the dual-beam oscilloscope
between pin (6) of P4303 and GND.
3. Press S2001 to call up the ADJ IN
mode and select the following subject.
Group:
VIDEO 3
Subject: SID CTR
• Using the
'
and
"
keys, adjust the
waveform’s top and bottom levels
from its center level to 4.4±0.1 Vp-p.
from its center level to 4.4±0.1 Vp-p.
GND
Black level
Second-tone level
4.4V
4.4V
Waveform's center level
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