Rec C Level Adjustment - Sony CCD-TRV32 Service Manual

3-17. REC C LEVEL ADJUSTMENT

Purpose : Maintains a constant chroma level when
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.
Mode CAM-REC
Signal White pattern (See page 6-2)
• CN102 pin 2
Measurement Point
(Check connector)
• VIDEO output terminal
(terminated in 75Ω)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 37
Specification Value
A= 23.5 ×
A= 32.4 ×
Adjustment procedure:
Order Page Address
1
2 6 00
3 6 01
4 6 01
5
6 F 37
7
8 6 01
9 6 00
V V
1 2
V
VIDEO OUT Signal
( )
Vo
mVp-p ± 2mVp-p
700
(PAL)
( )
Vo
mVp-p ± 2mVp-p
714
(NTSC)
Data
Shoot the all white pattern to the full picture frame.
01 After setting the data, press the PAUSE button. (Preparation)
Read the data pf page : 6, address : 01, and record it.
45 After setting the data, press the PAUSE button.
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).
Change data using PLAY and STOP buttons so that the REC signal at CN102 pin 2
amplitude (A) satisfies the specification.
Press the PAUSE button.
Set the data which is recorded in step 3 to this address and, press the PAUSE button.
00 After setting the data, press the PAUSE button. (End)
(
V + V
V
1
3
V
O =
Procedure
)
+ V
2 3
3
V
6-75
A