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4-1B. LCD Drive Adjustment (B) (In case of "TB" type optical engine)
Adjust Items
Input Signal
1. Input level check
1-1. Input level check
16-stairstep
1-2. Input level
16-stairstep
adjustment of RGB
signals
1-3. Input level
Gray scale or
adjustment of
video signal
2. PSIG adjustment
2-1. SID level adjust-
ment
2-2. PRG level
adjustment
3. Gamma adjustment
3-1. Center voltage
16-stairstep
adjustment
3-2. Bias adjustment
16-stairstep
3-3. Black gamma
16-stairstep
adjustment
Test
Equip-
Test Point
ment
Oscillo-
TP405 (R)
waveform
scope
TP505 (G)
TP605 (B)
Oscillo-
TP701 (R)
waveform
scope
TP702 (G)
TP703 (B)
Oscillo-
TP701
stairstep
scope
TP702
waveform
TP703
––––
Oscillo-
TP403
scope
(TP503) (G)
(TP603) (B)
––––
Oscillo-
TP403
scope
(TP503) (G)
(TP603) (B)
Oscillo-
TP402 (R)
waveform
scope
TP502 (G)
TP602 (B)
Oscillo-
TP402 (R)
waveform
scope
TP502 (G)
TP602 (B)
Oscillo-
TP402 (R)
waveform
scope
TP502 (G)
TP602 (B)
Table 1-4-3
Adjust Key
Adjust Value
• 0.72V ± 50 mV
between pedestal
and white level of
sixteenth stair-
step waveform
• 1.15V ± 20 mV
VGR
(TP701 and
VGG
TP702), 0.95V ±
VGB
20 mV (TP703)
between pedestal
and white level of
sixteenth stair-
step waveform
• 1.0V ± 20 mV
VGR
between pedestal
VGG
and white level
VGB
(R)
• Adjust at R so that
WM0
amplitude of
waveform A in the
right obtains 3.8V
± 50 mV. Then
check at G and B.
(R)
• Adjust at R so that
WM1
amplitude of
waveform A in the
right obtains 9V ±
50 mV. Then
check at G and B.
• Adjust for A = B
WM7
as shown in
illustration right.
• Adjust the 16th
W03
stairstep wave-
W04
form for following
W05
values:
6.84 ± 20 mV
• Adjust the 2nd
W09
stairstep wave-
W0A
form for following
W0B
values:
4.60V ± 60 mV
1-10
Note
• Perform adjustment in
IN1
and
modes.
IN4
• Trigger the scope at TP901
(H period).
• Perform adjustment in
IN1
mode and RGB1 input.
• Trigger the scope at TP901
(H period).
• Perform adjustment in
IN4
mode and Video 2 input.
• Trigger the scope at TP901
(H period).
B
A
• Trigger the scope at TP901
(H period).
16th stairstep
• Trigger the scope at TP901
(H period).
2nd stairstep
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