Panasonic PV-M2738 Operating, Service Manual

Page: 52 / 151

2-31
30
30 30
30
30
4th line
4th line
Bottom edge of the screen
Top edge of the screen
Top
Bottom
3rd line
A B
11th line
V. HEIGHT/H. POSITION ADJUSTMENT
Purpose :
To set the standard vertical and horizontal picture size.
Symptom of Misadjustment :
The picture size is on the vertical and horizontal axis is
abnormal.
Test Point : ----------
Adjustment : V SIZE (EVR),
H CENTER (EVR)
Specification: Refer to descriptions below.
Input
: Video Input Jack
Monoscope Pattern Signal
Mode : STOP
Equipment : NTSC Video Pattern Generator
1. Supply a Monoscope Pattern Signal to the Video Input
Jack.
2. Select V SIZE in EVR adjustment mode and adjust so that
the top 4th line is just in view.
3. Confirm that the bottom 3rd line is in view and that the
bottom 4th line is out of view.
If the lines are not positioned correctly, readjust V SIZE so
that the 11th line is just in view.
4. Select H CENTER in EVR adjustment mode and adjust so
that A is approximately equal to width B.
Fig. E9
50V
5ms
A
TP50
DC GND
WHITE BALANCE ADJUSTMENT
Purpose:
To set the standard white level for each color
temperature.
Symptom of Misadjustment :
White becomes bluish or reddish.
Test Point : TP50 (CRT C.B.A)
Adjustment : FOCUS CONTROL (Flyback Transformer),
SCREEN CONTROL (Flyback Transformer),
SUB BRIGHT (EVR)
G DRIVE (EVR),
B DRIVE (EVR),
R CUT -OFF (EVR),
G CUT -OFF (EVR),
B CUT -OFF (EVR),
Specification: Refer to descriptions below.
Input
: Video Input Jack
Monoscope Pattern Signal,
White Pattern Signal
Mode : STOP
Equipment : NTSC Video Pattern Generator,
White Pattern Generator, Oscilloscope,
1. Supply a Monoscope Pattern Signal to the Video Input
Jack.
2. Connect the Oscilloscope to TP50 on the CRT C.B.A.
(Use TP47E for GND.)
3. Select SUB BRIGHT and move the shaded area to the
value in EVR adjustment mode.
4. Adjust the FOCUS CONTROL on the Flyback Transformer
so that the center of picture is the sharpest.
5. Press DISPLAY key (Service Switch) on the remote control
for collapse scan. (Refer to How to Enter Service Mode.)
6. Turn the SCREEN CONTROL on Flyback Transformer
fully counterclockwise.
7. Adjust SUB BRIGHT in EVR adjustment mode so that the
level A is 185 +/- 5VDC.
Fig. E10
8. Turn the SCREEN CONTROL on the Flyback Transformer
clockwise carefully and stop at the point where any color is
first observed.
9. In EVR adjustment mode, select the two colors not observed
in step 8 from the following control functions (B CUT -OFF,
G CUT -OFF, or R CUT -OFF) and adjust so that the
horizontal line becomes white.
For example, if the horizontal line appeared red in step 8,
select and adjust the B CUT -OFF and G CUT -OFF.