Sharp LC-37AD1E Service Manual page 38

LC-37AD1E
5. Adjustment
5-1.VLS BIAS (15V) voltage adjustment
Shift to the "VLS BIAS" item with the cursor UP/DOWN key and select a numeric value with the cursor
RIGHT/LEFT key.
Connect a digital volt meter to TP4101 (or C4180+) on the monitor PWB and make a adjustment with the
cursor UP/DOWN key so that the voltage becomes 15.00 ± 0.05V.
5-2.GRAY LEVEL (14.5V) voltage adjustment
Shift to the "GRAY LEVEL" item with the cursor UP/DOWN key and select a numeric value with the cursor
RIGHT/LEFT key.
Connect a digital volt meter to TP4104 (near IC4101) on the monitor PWB and make a adjustment with the
cursor UP/DOWN key so that the voltage becomes 14.50 ± 0.05V.
Because this voltage is a gray scale reference voltage, adjust it correctly.
5-3.COM BIAS adjustment
Shift to the "COM BIAS" item with the cursor UP/DOWN key and select a numeric value with the cursor
RIGHT/LEFT key.
Changing the numeric value with the cursor UP/DOWN key will make appear the test pattern. Make an
adjustment so that the flicker near the center of the screen is minimized.
5-4.Background adjustment
Start up the set with the AVC System connected and adjust the background of the monitor.
• Procedure
-1) Display the adjustment screen (200-level gray scale on High side, 48-level gray scale on Low side).
-2) Adjust "R OFFSET", "G OFFSET" and "B OFFSET" so that the 200-level gray scale pattern becomes
normative.
Adjust the chromaticity of the High pattern (in the left portion of the screen) so that x = 0.278 and y =
0.283.
-3) Adjust "R GAMMA", "G GAMMA" and "B GAMMA" so that the 48-level gray scale pattern becomes
normative.
Adjust the chromaticity of the Low pattern (in the right portion of the screen) so that x = 0.235 and y
= 0.230.
The above-mentioned adjustments can be made according to the following procedure.
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