Panasonic WEMV180A - VIDEO IMAGER Panduan Servis - Halaman 13
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TP312
(CSIG)
TP311
(CMSIG)
Fig. 4-17
8
Change the connection of the Oscilloscope to TP313.
8
Select the Negative mode by the Nega Button.
8
Confirm that the symmetry of the Burst signal again.
If not symmetry, return to the step (15) Chroma A/D
Offset Adjustment and repeat adjust from (15) Chroma
A/D Offset Adjustment and (16) Chroma A/D Level
Adjustment until satisfactory.
(17) Luminance D/A Level Adjustment
Test Point:
TP308 (DSIG)
TP309 (YSIG)
Adjust:
VR305 (YDAGA)
8
Connect CH1 of the Oscilloscope to TP308 and CH2 to
TP309.
8
Trigger the Oscilloscope at TP309.
8
Set the vertical position of the Oscilloscope so that the
signals at TP308 and TP309 become overlapped.
8
Adjust VR305 so that the both Luminance signals become
coincide each other as shown in Fig. 4-18.
TP308
(DSIG)
TP309
(YSIG)
Fig. 4-18
(18) Chroma Reverse Offset Adjustment
Test Point:
TP311 (CMSIG)
Adjust:
VR308 (XCDAOF)
8
Connect the Oscilloscope to TP311.
8
Trigger the Oscilloscope at TP309.
8
Take the freeze picture by the Frame Memory Button.
8
Adjust VR308 so that DC level at TP311 becomes stable
as shown in Fig. 4-19.
Adjust same
amplitude as
TP311
Adjust same
amplitude as
TP312
8
(19) Subcarrier Frequency Adjustment
Video Board
Test Point:
Video Board
Adjust:
Video Board
8
8
8
8
8
(20) Delay Line Bias Adjustment
Test Point:
Adjust:
8
8
8
8
Video Board
8
Video Board
8
10
TP311
(CMSIG)
Fig. 4-19
RGB Board
Before adjusting the RGB Board set the Volume
Controls as follows:
VR1 (HUE) . . . . . . . . . . . . . . . . .Mechanical Center
VR3 (APLG) . . . . . . . . . . . . . . . .Mechanical Center
VR4 (CGA) . . . . . . . . . . . . . . . . .Mechanical Center
TP1 (SCOUT)
VR2 (SC)
Disconnect the Connector of the Camera Unit from CN1
on the Video Board.
Disconnect all input signals from the Video Input
Connectors.
Select the A/V 1 mode by the Input Selector.
Connect the Frequency Counter to TP1.
Adjust VR2 to obtain 4.433619 MHz ± 50 Hz.
TP4 (DLABIAS)
VR5 (DLY)
Disconnect the Connector of the Camera Unit from CN1
on the Video Board.
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.
Select the Video Imager mode by the Input Selector.
Connect the Digital Voltmeter to TP4.
Turn L2 to fully clockwise.
Adjust VR5 to obtain 3.0 ± 0.1 V DC.
An adjustment should be made with the Positive mode
and Negative mode by pressing the Nega Button
alternately.
No vibration.
RGB Board
RGB Board
RGB Board
RGB Board