JVC VF-P116U Service Manual page 18

Measuring point ( * )
Measuring
No. Item instruments & Adjustment parts ( - )
Adjustment level ( + )
Input signals
2.7 ADJUSTMENT OF CENTERING
- BRIGHT(VR8)[VR]
1 Centering
adjustment CONTRAST(VR1)[VR1]
- H. LIN(L4)[MAIN]
V. HEIGHT(VR4)[MAIN]
- DY centering magnet
[Deflection yoke]
2.8 ADJUSTMENT OF H.LINEARITY
- H. LIN(L4)[MAIN]
1 H. linearity • Resolution chart of
adjustment Registration chart
Adjustment procedure
No.
2.9 ADJUSTMENT OF V.AMPLITUDE (for 4:3)
1) Set the BRIGHT and CONTRAST controls on 1
the front panel to the mechanical center posi-
tion respectively.
1) Reduce the raster part by tuning the H.LIN and
V. HEIGHT controls.
1) Adjust the DY centering magnet of the deflec-
tion yoke so as to position the raster part in
the center of the CRT.
2.9 ADJUSTMENT OF V.AMPLITUDE (for 16:9)
1
Raster part
CRT screen
2.10 ADJUSTMENT OF SUB-BRIGHTNESS
1
1) Shoot the resolution chart or registration chart
so as to take the central circle of the chart as
large as possible.
2) Adjust the H.LIN control so that the linearity of
the picture is aligned in both the sides.
2.11 ADJUSTMENT OF FOCUS
1
Protecive glass of CRT
Fluorescent screen of CRT
5
Measuring point ( * )
Measuring
Adjustment parts ( - )
Item instruments &
Adjustment level ( + )
Input signals
- V. HEIGHT(VR501)[VR]
V. amplitude • Resolution chart or
adjustment Registration chart
- V. HEIGHT2(VR502)[VR]
V.amplitude • Resolution chart or
adjustment Registration chart
- SUB BRIHT(VR7)[MAIN]
Sub-brightness
adjustment
- FOCUS(VR6)[MAIN]
Focus
adjustment
5
Adjustment procedure
1) Shoot the resolution chart or registration chart
so as to take the central circle of the chart as
large as possible.
2) Adjust the V. HIGHT control so that the central
circle of the chart shows a perfect circle.
3) If the central circle looks elliptical, fine adjust
the H.LIN control(L4) to correct it.
1) Set to 16 : 9 mode.
2) Shoot the resolution chart or registration chart
so as to take the central circle of the chart as
large as possible.
3) Adjust the V.HIGHT control so that the central
circle of the chart shows a perfect circle.
4) If the central circle looks elliptical, fine adjust
the H.LIN control(L4) to correct it.
5) Return to 4 : 3 mode.
1) Set BRIGHT and PEAKING controls on the front
panel to the minimum position, while set the
CONTRAST control to the maximum position.
2) Adjust the SUB BRIGHT control so that the
raster is seen dimly.
1) Shoot an object by the camera.
2) Set the CONTRAST and PEAKING controls on
the front panel to the mechanical center posi-
tion respectively.
3) Turn up and down the brightness with the
BRIGHT control on the front panel while ad-
justing the FOCUS control to obtain the best
focus.