– 10 –
8
Adjust VR611 and VR621 so that the 700 mV portion of the
Stairstep signals becomes 700 ± 15 mV as shown in Fig.
4-2.
Fig 4-2
(9). Decoder 3 Input Level Adjustment
Test Point:
Multiscreen Output Connector Rear Panel
Adjust:
VR631 (DECODER-3)
Analog Board
8
Supply the Stairstep signal (5 Steps, Chroma off) to the
Video Input Connector 1.
8
Connect the terminated Oscilloscope with 75
Ω
to the
Multiscreen Output Connector.
8
Press the Numeric Button 1.
8
Adjust VR631 so that the 700 mV portion of the Stairstep
signal becomes 700 ± 15 mV as shown in Fig. 4-2.
3
Motion Detector Board
8
Set the #5 and #8 of SW23 on the Main Board to ON
position as shown in Fig. 4-3.
Fig 4-3
8
Turn on the power.
(10). G/L PLL DC Adjustment
Test Point:
TP601 (G/L PLL DC-1)
Motion Detector Board
TP602 (G/L PLL DC-2)
Motion Detector Board
Adjust:
L607 (G/L PLL DC-1)
Motion Detector Board
L608 (G/L PLL DC-2)
Motion Detector Board
8
Supply the Ramp signal to the Video Input Connector 1.
8
Connect the Digital Voltmeter to TP601.
8
Adjust L607 to obtain 2.5 ± 0.1 V.
8
Connect the Digital Voltmeter to TP602.
8
Adjust L608 to obtain 2.5 ± 0.1 V.
(11). Pedestal Adjustment
Test Point:
TP101 (Y-1)
Motion Detector Board
TP201 (Y-2)
Motion Detector Board
Adjust:
VR101 (Y.PED-1)
Motion Detector Board
VR201 (Y.PED-2)
Motion Detector Board
8
Supply the White Raster signal to the Video Input
Connector 1.
8
Set the #1 of SW601 on the Motion Detector Board to ON
position as shown in Fig. 4-4.
Fig 4-4
8
Set the Luminance Level of input signal to 0 mV.
8
Connect the Digital Voltmeter to TP101.
8
Adjust VR101 to obtain 0.7 ± 0.1 V.
8
Connect the Digital Voltmeter to TP201.
8
Adjust VR201 to obtain 0.7 ± 0.1 V.
(12). Y Level Adjustment
Test Point:
TP101 (Y-1)
Motion Detector Board
TP201 (Y-2)
Motion Detector Board
Adjust:
VR102 (Y.GAIN-1)
Motion Detector Board
VR202 (Y.GAIN-2)
Motion Detector Board
8
Supply the White Raster signal to the Video Input
Connector 1.
8
Set the Luminance Level of input signal to 700 mV.
8
Connect the Digital Voltmeter to TP101.
8
Adjust VR102 to obtain 2.4 ± 0.2 V.
8
Connect the Digital Voltmeter to TP201.
8
Adjust VR202 to obtain 2.47 ± 0.2 V.
8
After completing of the adjustment, set the #1 and #2 of
SW601 to OFF position as shown in Fig. 4-5.
Fig 4-5
1 2 3 4 5 6 7 8
ON
OFF
SW23
1 2
ON
OFF
SW601
1 2
ON
OFF
SW601
700
±
15 mV
700 mV portion
