Sharp Aquos LC-20S4E, Service Manual

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13
LC-20S4E
5. Adjustment
5-1. RF AGC adjustment
1) Feed in the colour bar signal (Field strength: 52dBµ V)
2) In Adjustment Mode, select RF AGC AUTO ("OFF") and press the "RIGHT" cursor key to start the adjustment.
3) Automatic adjustment complete, when it displayed "OK".
4) RF AGC data will be in the range of 0-63. If "NOK" is displayed, adjustment failed.
5) Check that the value is 30±10.
5-2. DCXO adjustment
1) Feed in the B/G NICAM signal. (Field strength: more than 70dBµ V.)
2) In Adjustment Mode, select the DCXO AUTO ("OFF") and press "RIGHT" cursor key to start the adjustment.
3) Automatic adjustment complete when "OK" is displayed. If "NOK" is displayed, adjustment failed.
4) Check that the value is 58±25.
5-3. Common bias adjustment
1) In adjustment mode, select the COM BIAS.
2) Select the internal signal "flicker pattern".
* Remote control direct key: No. 19 (13 Hex).
3) Adjust the flicker to become smallest.
4) After adjustment, exit from the "flicker pattern" display.
* Remote control direct key: No. 19 (13 Hex).
5-4. White balance adjustment
[A] White balance pre-adjustment
1) Feed the 0%/100% white signal.
2) In Adjustment Mode, select AWBSD ("OFF") and press "RIGHT" cursor key to start the adjustment.
3) Automatic adjustment complete when "OK" is displayed.
[B] White balance adjustment
For 40% white signal adjust RGB CUTOFF2 and for 80% white signal adjust RGB-GAIN.
1) Composite Signal
[Input signal] Composite video signal with picture of 80% white(Left) and 40% white(Right).
[Adjustment] Adjust the RGB CUTOFF2 and RGB-GAIN
[Adjustment method MANUAL]
CUT OFF RGB CUT OFF2
Fix the G value, and adjust R, B value.
GAIN WB RGB-GAIN Fix the G value, and adjust R, B value.
( Data taken from MINOLTA CA-210)
S4E Main Ver
***
Scaler Ver *****
RF AGC OK
30
RF AGC Auto adjustment complete
RF AGC data (Example)
S4E Main Ver
***
Scaler Ver *****
DCXO AUTO OK
**
DCXO Auto adjustment complete
DCXO data
Adjustment Inspection
Specification Specification
80% white
x 0.285 0.002 0.01
y 0.291 0.002 0.01
40% white
x 0.277 0.003 0.01
y 0.284 0.003 0.01
←
0%
←
100%
LCD SCREEN