LC-20SH1EB - Sharp TV Service Manual (repair manual). Page 6

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) Select COM BIAS in the adjustment process mode.
2) Get the built-in flicker pattern displayed onscreen.

Direct key on the remote controller: No. 19 (13 hex)

3) Using the LEFT and RIGHT keys, adjust the flicker to minimum.
4) Finally make the flicker pattern display disappear.

Direct key on the remote controller: 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

RB variable adjust

GAIN

WB RGB-GAIN

RB variable adjust

( Data taken from MINOLTA CA-210)

SH1EB

Main Ver

***

Scaler Ver *****

RF AGC AUTO

OK

30

RF AGC Auto adjustment complete
RF AGC data (Example) 

SH1EB

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