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2-4-2.
SYNC AGC Check (MA-249 Board)
Mode E-E
Signal Color
bar
Measurement point
Video LINE OUT terminal
Measuring instrument
Oscilloscope
Specified value
A=1.00 ± 0.05Vp-p
[Check Method]
1) Check that the SYNC AGC level (A) satisfies the specified
value.
Fig. 7-2-5.
2-4-3.
White Clip/Dark Clip Check (MA-249 Board)
Mode E-E
Signal Color
bar
Measurement point
IC201 pin #2
Measuring instrument
Oscilloscope
Specified value
White clip: 190 ± 15%
Dark clip: 52 ± 10%
[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 ± 10% to the white (100%)
level.
Fig. 7-2-6.
2-4-4.
Recording Y Level Check (MA-249 Board)
Mode E-E
Signal No-signal
Measurement point
Q214 Emitter
Measuring instrument
Oscilloscope
Specified value
A=550 ± 150mVp-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-249 Board)
Mode Recording
Signal Color
bar
Measurement point
IC201 pin #0
Measuring instrument
Oscilloscope
Specified value
A=160±28mV
[Check Method]
1) Confirm the amplitude of recording chroma level becomes the
specified value.
Fig. 7-2-8.
7-4
A
H
White (75%)
100%
H
A
B
A
A
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