Sharp 29A-SX1 - Page 11

11
29A-SX1
29A-SX5
29A-SX8
SX-68JF200
11
SECAM CHROMA ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1
BELL FILTER fo I
2
C bus adjust-
ment
1 Receive Oi-5CH(SECAM colour bar). 2 Select the bell filter fo adjustment mode. 3 Connect the oscilloscope to 21pin of IC900.
Range : 10mV/Div. (AC) Sweep time: 20µsec/Div. (10:1 probe is used.)
4 Vary the bell filter data to align the waveform to
be the nearest to that in Fig. 1-1(b).
(Arrange the level to gain the whole balance.)
Fig. 1-1(a)
Fig. 1-1(b)
1 Receive Oi-5CH(SECAN colour bar). 2 Select SECAM black level adjustment R-Y
mode.
3 Connect the oscilloscope to 11pin of IC900 (R-
Y OUT, TP902).
Range: 10mV/Div. Sweep time: 20µsec/Div. (10:1 probe is used.)
4 Vary R-Y data to minimize the offset between
the non-signal line and signal line as shown in Fig. 2-1(b).
5 Select SECAM black label adjustment B-Y
mode.
6 Reconnect the oscilloscope to 10pin of IC900
(B-Y OUT, TP901).
The conditions are the same as in Item 3.
7 Vary B-Y data to minimize the offset between
the non-signal line and signal line as shown in Fig. 2-2(b).
OFF SET
OFF SET
Fig. 2-1(a)
Fig. 2-1(b)
Fig. 2-2(a)
Fig. 2-2(b)
SECAM black level R-Y/B-Y I
2
C bus adjust-
ment
2