Panasonic WEMV180A - VIDEO IMAGER Manuale di servizio - Pagina 11
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(9) Camera Through Output Level Adjustment
Test Point:
TP1 (YIN)
TP21 (SVYOUT)
TP22 (SVCOUT)
Adjust:
VR1 (SYOUT)
VR14 (SCOUT)
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 the Oscilloscope to TP21.
8
Trigger the Oscilloscope at TP1.
8
Adjust VR1 so that the Luminance signal level becomes
+ 0
2.6 x (Vy)
Vp-p as shown in Fig. 4-9.
– 0.1
TP21
(SVYOUT)
8
Change the connection of the Oscilloscope to TP22.
8
Adjust VR14 so that the Burst signal level becomes 2.2 x
(Vc) ± 30 mVp-p as shown in Fig. 4-10.
TP22
(SVCOUT)
Fig. 4-10
(10) Hue Adjustment
Adjust:
VR8 (NEGAHUE)
Observe:
Composite Video Output Connector
8
Supply 75% 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
Connect the Vectorscope to the Composite Video Output
Connector.
8
Select the Negative mode by the Nega Button.
Video Board
Video Board
Video Board
Video Board
Video Board
2.6 x (Vy)
+ 0
Vp-p
– 0.1
Fig. 4-9
2.2 x (Vc)
± 30 mVp-p
Video Board
8
Set the Gain Control of the Vectorscope to proper gain.
8
Adjust VR8 so that the Blue vector positions its correct
position as shown in Fig. 4-11.
dø
20%
dG
10°
0°
10°
20%
dG
8
Confirm the Blue vector is not changed between the
Positive mode and Negative mode.
Frame Memory Section
8
Before adjusting the Frame Memory Section of the
Video Board set the Volume Controls as follows:
VR2 (CADOF) ...................................Fully Clockwise
VR4 (YDAGA) ..............................Mechanical Center
VR8 (CADGA) . . . . . . . . . . . . . . . . .Fully Clockwise
(11) Chroma D/A Offset Coarse Adjustment
Test Point:
TP307 (CADIN)
Adjust:
VR303 (CADOF)
8
Connect the Camera Unit to CN1 on the Video Board.
8
Connect the Oscilloscope to TP307.
8
Trigger the Oscilloscope at TP309.
8
Select the Video Imager mode by the Input Selector.
8
Adjust VR303 so that DC level becomes 2.8 ± 0.1 V DC
as shown in Fig. 4-12.
TP307
(CADIN)
(12) Burst Gate Pulse Width Adjustment
Test Point:
TP301 (BGPP)
TP312 (CSIG)
Adjust:
VR301 (BGPW)
8
Connect CH1 of the Oscilloscope to TP312 and CH2 to
TP301.
8
Trigger the Oscilloscope at TP309.
8
cy
g
R
M
G
V
75%
Y
L
100%
b
U
B
yl
C
G
Y
mg
r
Fig. 4-11
Video Board
Video Board
2.8 ± 0.1 V DC
GND Level
Fig. 4-12
Video Board
Video Board
Video Board