Toshiba TLP-710U, Service Manual

Page: 12 / 30

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