Sharp 21L-FG1SA - 7. PAL CHROMA ADJUSTMENT; 8. NTSC CHROMA ADJUSTMENT; 9. SECAM CHROMA ADJUSTMENT

21L-FG1SA/SF/SM/RU
3 – 22
8. NTSC CHROMA ADJUSTMENT
9. SECAM CHROMA ADJUSTMENT
No. Adjustment point Adjustment procedure/conditions Waveform and others
SUB-TINT
(I
2
C BUS
CONTROL)
1
1) Receive the "NTSC 3.58 Color Bar" signal thru
AV in.
2) Connect the oscilloscope to B-Amp Transistor
Base (JUMPER 410).
Range : 100mV/Div.(AC)(Use Probe 10:1)
Sweep time : 10 µsec/Div.
3) In Service mode, go to V07, press R/C Y-mute
(Hex F4) or FLASHBACK Key.
4) Call the "V07" data in service mode. Adjust the
"V07" bus data to obtain the waveform shown as
Fig. 1-1.
5) Disable Y-Mute by pressing key (Hex E4) or
FLASHBACK, then clear the SERVICE mode.
No. Adjustment point Adjustment procedure/conditions Waveform and others
SECAM
BLACK LEVEL
R-Y/B-Y
(I
2
C BUS
CONTROL)
1) Receive “SECAM COLOUR BAR” signal.
2) In the service mode, select service data V14.
3) Connect oscilloscope to TP 801.
Range : 20mV/Div. (AC)(Use Probe 10:1)
Sweep time : 20 µsec/Div.
4) Adjust the V14 so that the offset of R-Y is mini-
mum, shown in Fig 2-1(b), it means adjust the
of fset of between No signal line and Signal line to
minimum.
5) In the service mode, select service data V15.
6) Connect oscilloscope to TP 801.
Range : 20mV/Div. (AC)(Use Probe 10:1)
Sweep time : 20 µsec/Div.
7) Adjust the V15 so that the offset of B-Y to mini-
mum, shown in Fig 2-2(b), it means adjust the
of fset of between No signal line and Signal line to
minimum.
1
Fig 2-1(a)
Offset
Offset
Fig 2-1(b)
Fig 2-2(a)
Fig 2-2(b)