Sony VPH-G90E, Service Manual

Page: 84 / 546

1-74
VPH-G90E/G90U/G90M
86
Adjustments
Adjustments
Adjusting the Blue Lens Focus and Scheimpflug
1
Adjusting the blue lens focus
1
Reset the centering adjustment data of the blue signal.
For details, see “Resetting the Data” on page 138.
2
Press the PATTERN key until the H-pattern or ME-pattern is
displayed.
3
Press the CUT OFF G and R keys to display the blue signal only.
4
Loosen the B1 screw, slide it so that the letters H at the center of the
screen are in focus, then tighten the screw.
For details, see “Adjusting the green lens focus” on page 81.
5
Loosen the B2 screw, slide it so that the letters H at all four corners of
the screen are in focus, then tighten the screw.
Repeat steps
4 and 5 until the blue focus adjustment is completed.
2
Adjusting the blue magnetic focus and AQP/DQP roughly, if necessary
The magnetic focus and AQP/DQP will be adjusted precisely after the lens
focus and scheimpflug adjustments. Adjust the blue magnetic focus and
AQP/DQP roughly at this stage to make the later adjustments easily.
For details of the magnetic focus and AQP/DQP adjustments, see page 87.
3
Adjusting the blue scheimpflug
After adjusting the blue lens focus, adjust the blue scheimpflug (angle of
the blue CRT).
Check the tilt of the focal planes at the upper, lower, left and right parts of
the screen, then adjust the focus with the H and V screws on the blue CRT.
For details, see “Adjusting the green scheimpflug” on page 83.
4
Adjusting the blue lens focus precisely
After adjusting the blue scheimpflug, readjust the blue lens focus until the
perfect focus is obtained.
For the procedure of the adjustment, see “
1
Adjusting the green lens focus” on
page 81.
Proceed to adjust the green magnetic focus and AQP/DQP.
Adjusting the Lens Focus and Scheimpflug
Adjustments
87
Adjustments
After adjusting the lens focus and scheimpflug, adjust the magnetic focus,
AQP (Axis Quadrupole)/DQP (Diagonal Quadrupole) and AHP (Axis
Hexapole)/DHP (Diagonal Hexapole).
What is the AQP/DQP adjustment?
What is the AHP/DHP adjustment?
1
Adjusting the green magnetic focus, AQP/DQP and AHP/DHP
1
Press the CUT OFF R and B keys to display the green signal only.
2
Press the MG FOCUS key.
The DOT pattern (9
×
9) appears on the screen, and a square for
adjusting focus is displayed on the center of the screen. The adjustment
mode, adjustment position No., and adjustment items overlap with the
DOT pattern.
F O C U S A D J P O S I T I O N
- G - M G - V N o . 1
A L L : [ 1 2 8 ]
2 P H : 1 2 8
2 P V : 1 2 8
4 P A : 1 2 8
4 P D : 1 2 8
6 P A : 1 2 8
6 P D : 1 2 8
SEL: ADJ:
NEXT: + –
3
Adjust the focus at the center (position No.1) of the screen.
Press the
v
or
V
key to select the item (by moving [ ] to the item), and
press the
B
or
b
key to adjust the data.
1
Press the
B
or
b
key to set ALL to +40 so that flare appears on the
screen.
2
Press the
v
or
V
key to select 2PH, then press the
B
or
b
key so that
the core of a spot is located at the horizontal center of the flare.
3
Select 2PV, then adjust so that the core of a spot is located at the
vertical center of the flare.
b
b
DQP adjustment
Correct the diagonal distortion of
the spot.
AQP adjustment
Correct the vertical or horizontal
distortion of the spot.
Adjusting the Magnetic Focus
DHP adjustment
b b
AHP adjustment
Correct the triangular-form distortion of the spot.
(continued)