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6-63
Vo
700
( )
3-16. REC C LEVEL ADJUSTMENT
Purpose :
Maintains a constant chroma level when
recording on tape.
recording on tape.
Adjustment error :
If level is low, overall S/N deteriorates.
If level is high, S/N of Y signal at deep color
deteriorates and white streaking noise appears.
If level is high, S/N of Y signal at deep color
deteriorates and white streaking noise appears.
Mode
CAM-REC
Signal
White pattern (See page 6-2)
Measurement Point
• CN102 pin 2
(Check connector)
• VIDEO output terminal
(terminated in 75
(Check connector)
• VIDEO output terminal
(terminated in 75
Ω
)
Measuring Instrument
Oscilloscope
Adjustment Page
F
Adjustment Address
37
Specification Value
A= 23.5
×
mVp-p ± 2mVp-p
(PAL)
A= 32.4
×
mVp-p ± 2mVp-p
(NTSC)
Adjustment procedure:
Vo
714
( )
Order
Page
Address
Data
Procedure
1
Shoot the all white pattern to the full picture frame.
2
6
00
01
After setting the data, press the PAUSE button. (Preparation)
3
6
01
Read the data pf page : 6, address : 01, and record it.
4
6
01
45
After setting the data, press the PAUSE button.
5
Measure the chroma output level of the VIDEO OUT connector. Obtain the average
value of three points (beginning, middle, end) of a vertical period. Call the average value
Vo (mV).
value of three points (beginning, middle, end) of a vertical period. Call the average value
Vo (mV).
6
F
37
Change data using PLAY and STOP buttons so that the REC signal at CN102 pin 2
amplitude (A) satisfies the specification.
amplitude (A) satisfies the specification.
7
Press the PAUSE button.
8
6
01
Set the data which is recorded in step 3 to this address and, press the PAUSE button.
9
6
00
00
After setting the data, press the PAUSE button. (End)
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