Panasonic BT-H1700P

63
VERTICAL IMAGE POSITION, VERTICAL IMAGE AMPLITUDE AND SIDE PIN DISTORTION ADJUSTMENTS (NTSC/PAL UNDERSCAN 16:9 MODE)
Measuring Instruments Signal generator (Mono-scope signal, Crosshatch signal)
Card (Slot) NTSC/PAL Video Input Card (Slot 2)
Test Points
Adjustment Points DW** (Vertical Size), DW** (Vertical Position), DW** (Side Pin Distortion), CE** (Corner Distortion (W)), CE**
(Corner Distortion (S)), CE** (Parallelogram Distortion), CE** (Trapezoidal Distortion), CE** (Horizontal Arc
Distortion) [Service Menu]
1. Apply the NTSC mono-scope signal to INPUT C (Terminal VIDEO1
on the NTSC/PAL Video Input Card).
2. Press the ASPECT and UNDER SCAN buttons on the front panel
to set the scanning size to underscanning for the 16:9 ratio.
3. Set the CONTRAST and BRIGHT potentiometers on the front panel
to the center click positions.
4. Adjust DW05 in the Service Menu to set the vertical position of the
image at the center of the CRT screen.
5. Adjust DW04 to set the vertical amplitude of the image to 175mm.
6. Apply the NTSC crosshatch signal to INPUT C.
7. Adjust CE08 to optimize the trapezoidal distortion (observe the sec-
ond vertical lines from the left and right edges as the reference).
8. Adjust CE07 to optimize the parallelogram distortion (observe the
second vertical lines from the left and right edges as the reference).
9. Adjust CE09 to optimize the horizontal arc distortion.
10. Adjust DW06 so that the second vertical lines from the left and right
edges are linear.
11. If there is an extreme corner S-shape distortion, adjust CE06 to
optimize it (this adjustment is usually unnecessary).
12. If there is an extreme corner W-shape distortion, adjust CE05 to
optimize it (this adjustment is usually unnecessary).
13. Apply the NTSC mono-scope signal to INPUT C.
14. Ensure that the vertical amplitude of the image is 175mm. If it is
not, adjust DW04 again.
15. Adjust DW05 so that the vertical position of the image comes at the
center of the CRT screen.
16. Vary the adjustment signal and adjustment data, and re-perform
adjustments in steps 1 to 15 above (see Table 17 ).
90
90
80
80
80
175mm
90
Make these lines linear.
Scanning size (100%)
Screen size
Adjustment Adjustment
Adjustment Data
Step No. Signal
Vertical Vertical Side Pin Corner Corner Parallelogram Trapezoidal Horizontal
Position size Distortion Distortion (W) Distortion (S) Distortion Distortion Arc Distortion
1 NTSC DW05 DW04 DW06 CE05 CE06 CE07 CE08 CE09
2 PAL DW11 DW10 DW12 CE10 CE11 CE12 CE13 CE14
Table 17
Notes: • Perform the following adjustments after completing the Reference Mode (NTSL/PAL overscan 4:3 mode) and NTSC/PAL underscan
4:3 mode adjustments.
• The data adjusted for the reference mode becomes the reference value for the NTSC/PAL underscan 4:3 mode and NTSC/PAL
overscan/underscan 16:9 modes. When the data of the reference mode is changed, it is required to re-adjust the underscan data
and NTSC/PAL overscan/underscan 16:9 mode data for the same adjustment signal.
• The corner distortions (W) & (S), parallelogram distortion, trapezoidal distortion and horizontal arc distortion adjustment data
for this adjustment are common to those in the NTSC/PAL overscan 16:9 mode and the NTSC/PAL underscan 16:9 mode adjust-
ments. This adjustment data needs to be adjusted in either mode.
• The corner distortions (W) & (S), parallelogram distortion, trapezoidal distortion and horizontal arc distortion adjustment data
for this adjustment are common to those in the 480/60i and NTSC signal or 576/50i and PAL signal adjustments. This adjustment
data needs to be adjusted with either signal.