7-4
2-4-2. SYNC AGC Check (MA-286 Board)
Mode E-E
Signal Color bar
Measurement point IC201 pin #•
Measuring instrument Oscilloscope
Specified value A=2.10 ± 0.14Vp-p
[Check Method]
1) Check that the Video signal level (A) satisfies the specified
value.
Fig. 7-2-5.
2-4-3. White Clip/Dark Clip Check (MA-286 Board)
Mode E-E
Signal Color bar
Measurement point IC201 pin #¶
Measuring instrument Oscilloscope
Specified value White clip : 190 ± 15%
Dark clip : 52.5 ± 5%
Connect a resistor of 3.3Ω between IC201 pin $™ and GND.
[Check Method]
1) Check that the white clip level is 190 ± 15% to the white (100%)
level.
2) Check that the dark chip level is 52.5 ± 5% to the white (100%)
level.
Fig. 7-2-6.
2-4-4. Recording Y Level Check (MA-286 Board)
Mode E-E
Signal No-signal
Measurement point IC201 pin !•
Measuring instrument Oscilloscope
Specified value A=250 ± 50mVp-p
[Check Method]
1) Check that the recording RF signal satisfies the specified value.
Fig. 7-2-7.
2-4-5. Recording Chroma Level Check
(MA-286 Board)
Mode Recording
Signal Color bar
Measurement point IC201 pin !¢
Measuring instrument Oscilloscope
Specified value A=380 ± 40mV
[Check Method]
1) Confirm the amplitude of recording chroma level becomes the
specified value.
Fig. 7-2-8.
A
A
H
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