Toshiba TLP-450U, Service Manual

Page: 17 / 61

1-13
Adjust Items
5. Gamma correction at
video input
5-1. Video bias
adjustment
5-2. Video black
gamma adjustment
5-3. Ghost adjustment
6. Common voltage
adjustment
6-1. Common voltage
adjustment 1
6-2. Common voltage
adjustment 2
Input Signal
10-stairstep
waveform
10-stairstep
waveform
Retma signal
Adjustment
signal
Adjustment
signal
Test
Equip-
ment
Oscillo-
scope
Oscillo-
scope
––––
Oscillo-
scope,
confirm
on the
screen.
Oscillo-
scope,
confirm
on the
screen.
Test Point
TP402 (R)
TP502 (G)
TP602 (B)
TP402 (R)
TP502 (G)
TP602 (B)
––––
––––
––––
Adjust
mode
W03
W04
W05
W0C
W0D
W0E
(W1A)
WM4
WM5
WM6
WM4
WM5
WM6
Adjust Value
• Adjust the 10th
stairstep wave-
form for following
values:
5.3 ± 20 mV
• Adjust the second
stairstep wave-
form for following
values:
2.75 ± 20 mV
• If ghost is high,
adjust in W1A
mode.
• Select “Standard”
in Projection
mode on “Setting”
menu.
• Adjust so that the
flicker for each R,
G, B signal
becomes
minimum.
• Invert Up/Down
contents
displayed on the
screen.
• Select “Rear
Ceiling” in
Projection mode
on “Setting”
menu.
• Adjust so that the
flicker for each R,
G, B signal
becomes
minimum.
• After adjustment,
click the standard
button (PJ0) on
the setting screen
and return to the
standard status.
Note
• Trigger the scope at TP901
(H period).
• Trigger the scope at TP901
(H period).
Table 1-4-2
10th stairstep
Second stair step