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21JF2-RU/GA/SA/SF/SS
8. NTSC CHROMA ADJUSTMET
No.
Adjustment point
1
SUB-TINT
(I
2
C BUS CONTROL)
9. SECAM CHROMA ADJUSTMENT
No.
Adjustment point
1
SECAM
BLACK LEVEL
R-Y/B-Y
2
(I
C BUS
CONTROL)
Adjustment procedure/conditions
1) Receive the "NTSC3.58 Colour Bar" signal thru
AV in.
2) Connect the oscilloscope to B-Amp Transistor
Base (TP853 ).
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 E4) 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.
Adjustment procedure/conditions
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
offset 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
offset of between No signal line and Signal line to
minimum.
3 – 21
Waveform and others
W Y Cy G Mg R B
Fig. 1-1
Waveform and others
Offset
Fig 2-1(a)
Fig 2-1(b)
Offset
Fig 2-2(a)
Fig 2-2(b)
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