Sanyo VCC-WD8870P, Service Manual

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3-7. SYNC and BURST Level Adjustment
Adjustment location: Computer screen
Measuring location: VIDEO OUT
Measuring equipment: Oscilloscope
Subject:
Adjusting method:
1. Shield light with a lens cap to provide dark condition.
2. Use the “ ” button to be SYNC in the adjustment window.
3. Use the computer’s mouse to adjust the SYNC in the
adjustment window so that the video out terminal is 300 ±
5 mVp-p.
4. Use the “ ” button to be BURST in the adjustment
window.
5. Use the computer’s mouse to adjust the BURST in the
adjustment window so that the video out terminal is 300 ±
5 mVp-p.
3-8. White Balance Adjustment
Adjustment location: Computer screen
Measuring location: VIDEO OUT
Measuring equipment: Oscilloscope, Vectorscope
Subject: Color bar chart
Adjusting method:
1. Use the “ ” button to be A. IRIS in the adjustment window.
2. Auto iris adjustment will be started automatically.
3. Use the “ ” button to be M/WB1 in the adjustment window.
4. Display the color bar chart at designated picture angle.
5. Select the M/WB1 and M/WB2 by using the “ ” and “ ”
button in the adjustment window. Adjust by operating level
scroll bar so that the luminescent spot representing white is
overlapping with the crosshair mark in the center of the
vectorscope.
3-3-3. Computer screen during adjustment (WDDL5CS)
Note:
Each operation corresponds to the keyboard.
H ADDRESS minus .........
H ADDRESS plus .........
V ADDRESS minus .........
V ADDRESS plus ........
DT SW .........D
WDD .........W
LUMINANCE .........L
[Start] or [End] .........Speac
Shift and (
) .........Speed up
3-4. Sub Carrier Frequency Adjustment
Adjustment location: CT231 (CA-2)
Measuring location: TP231 (CA-2)
Measuring equipment: Frequency counter
Subject: No designation
Adjusting method:
1. Adjust with CT231 to 17734476 Hz ± 10 Hz.
3-5. 28 MHz VCO Voltage Adjustment
Adjustment location: CT251 (CA-2)
Measuring location: TP251 (CA-2)
Measuring equipment: Digital voltmeter
Subject: No designation
Adjusting method:
1. confirm an INT mode.
2. Adjust with CT251 to 5.0 ± 0.2 V.
3-6. Sensor Gain Confirmation
Adjustment location: Computer screen
Measuring location: VIDEO OUT
Measuring equipment: Oscilloscope
Subject: Color bar chart
Adjusting method:
1. Display the color bar chart at designated picture angle.
2. Click the adjustment software installed from the personal
computer, and the adjustment window will be displayed.
3. Click the START.
4. Use the “ ” button to be SENSOR in the adjustment
window.
5. HIGH and NORMAL are switched and a wave-like change
is checked. The level of HIGH is high.
sync
burst
300 mV ± 5 mV
300 mV ± 5 mV
VIDEO OUT
45 µsec