Panasonic WE-MV180A Service Manual page 9

Video Board
8
Before adjusting the Video Board set the Volume
Controls as follows:
VR1 (SYOUT)...............................Mechanical Center
VR2 (NEGWAJ)............................Mechanical Center
VR3 (CG)...........................................Fully Clockwise
VR6 (HSWAJ) ..............................Mechanical Center
VR7 (LLMT)..................................Mechanical Center
VR9 (NEGOF) ..............................Mechanical Center
VR10 (YG)....................................Mechanical Center
(2) Clamp Width Adjustment
Test Point: TP1 (YIN)
TP4 (CLP)
Adjust: VR4 (CLPWAJ)
8
Disconnect the Connector of the Camera Unit from CN1
on the Video Board.
8
Supply 100% Colour Bar signal from S-Video signal
output of the Video Signal Generator to the Test Points
TP1 (YIN) and TP7 (CIN) on the Video Board using an
Extension Cable.
8
Select the Video Imager mode by the Input Selector.
8
Connect CH1 of the Oscilloscope to TP1 and CH2 to TP4.
8
Trigger the Oscilloscope at TP1.
8
Adjust VR4 so that the falling edge of the Clamp Pulse
from the falling edge of the Luminance signal becomes 1.8
± 0.2 µs as shown in Fig. 4-1.
TP1 (YIN)
TP4 (CLP)
1.8 ± 0.2 µs
(3) Sync Protection 1 Adjustment
Test Point: TP1 (YIN)
TP5 (HSW)
Adjust: VR6 (HSWAJ)
8
Connect CH1 of the Oscilloscope to TP1 and CH2 to TP5.
8
Trigger the Oscilloscope at TP1.
8
Adjust VR6 so that the falling edge of the HSW signal from
the falling edge of the Luminance signal becomes 11 ± 0.3
µs as shown in Fig. 4-2.
Video Board
Video Board
Video Board
Fig. 4-1
Video Board
Video Board
Video Board
TP1 (YIN)
TP5 (HSW)
(4) Sync Protection 2 Adjustment
Test Point: TP1 (YIN)
TP6 (NEGW)
Adjust: VR2 (NEGWAJ)
8
Connect CH1 of the Oscilloscope to TP1 and CH2 to TP6.
8
Trigger the Oscilloscope at TP1.
8
Adjust VR2 so that the falling edge of the Luminance
signal from the falling edge of the NEGW signal becomes
2.0 ± 0.3 µs as shown in Fig. 4-3.
TP6 (NEGW)
TP1 (YIN)
(5) Nega Mode Pedestal Level Adjustment
Test Point: TP1 (YIN)
TP2 (YOUT)
Adjust: VR7 (LLMT)
8
Supply the Colour Bar signal from the Video Signal
Generator.
8
Connect the Oscilloscope to TP2.
8
Trigger the Oscilloscope at TP1.
8
Set the Oscilloscope to AC mode.
8
Select the Negative mode by the Nega Button.
8
Adjust VR7 so that the Negative Pedestal level becomes
coincidence with the pedestal level as shown in Fig. 4-4.
6
11 ± 0.3 µs
Fig. 4-2
Video Board
Video Board
Video Board
2.0 ± 0.3 µs
Fig. 4-3
Video Board
Video Board
Video Board