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X’tal OSC CHECK
Mode PB
Signal Alignment tape, Stair step
Measurement Point MA10 board Q823 emitter(NTSC)
IC802 %ªpin(PAL)
Measurement Equipment Oscilloscope
Specified Value 500±200mVp-p
Check: 1)Confirm the frequency is 3.579545MHz±82Hz(NTSC), and
4.433619MHz±100Hz(PAL).
2)Confirm the waveform amplitude is 500±200mVp-p.
Fig.3-3
SYNC AGC CHECK
3.579545MHz ± 82Hz (NTSC)
4.433619MHz ± 100Hz (PAL)
500 ± 200mVp-p
Mode E-E
Signal Color bar
Measurement Point MA10 board Q830 emitter
Measurement Equipment Oscilloscope
Specified Value 1.0±0.1Vp-p
Check: Confirm the waveform amplitude is 1.0±0.1Vp-p.
Fig.3-4
CARRIER DEVIATION CHECK
1.0 ± 0.1Vp-p
Mode E-E
Signal Color bar
Measurement Point MA10 board IC802 !•pin
Measurement Equipment Spectrum Analyzer
Specified Value f
2
-f
1
=1.00±0.08MHz
Check: Confirm f
2
-f
1
=1.00±0.08MHz
Confirm f
1
=3.40±0.13MHz(NTSC), and
3.80±0.13MHz(PAL)
Fig.3-5
WHITE/DARK CLIP CHECK
f
1
f
2
Mode E-E
Signal Color bar
Measurement Point MA10 board IC802 #¶pin
Measurement Equipment Oscilloscope
Specified Value 190±20%(White), 55±20%(Dark)
Preparation: Add 3.3kΩ resistor between IC802 $™pin and GND.
Check: Taking the height from sync to white level as 100%, check
white clip and dark clip.
100%
White clip
Dark clip
Fig.3-6