Video System Adjustments; Mhz/36 Mhz Origin Oscillation Adjustment (Vc-235 Board); Chroma Bpf F Adjustment (Vc-235 Board) - Sony DCR-TRV820 Service Manual

3-4.

VIDEO SYSTEM ADJUSTMENTS

3-4-1. Video System Adjustments
Adjusting Procedure:
1. 27 MHz/36 MHz origin oscillation adjustment
2. Chroma BPF f adjustment
0
3. S VIDEO OUT Y Level Adjustment
4. S VIDEO OUT chroma level adjustment
5. VIDEO OUT Y, chroma level check
6. Hi8/standard 8 mm AFC f
1. 27 MHz/36 MHz Origin Oscillation Adjustment
(VC-235 board)
Set the oscillation frequency of X1501.
If deviated, the synchronization will be disrupted and the color
will become inconsistent.
Note: 27 MHz ............... 720H model
36 MHz ............... 960H model
720H model: DCR-TRV820/TRV820P
960H model: DCR-TRV820E
Mode Camera
Measurement Point Pin ia of IC2201
Measuring Instrument Frequency counter
Adjustment Page F
Adjustment Address 4D
Specified Value f=13500000 ± 68 Hz
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: F, address: 4D, change the data and set the clock
frequency(f) to the specified value.
3) Press the PAUSE button of the adjustment remote commander.
4) Select page: 0, address: 01, and set data: 00.
VC-235 BOARD
216
1
IC2201
54
55 81
adjustment
0
163
162
109
108
2. Chroma BPF f Adjustment (VC-235 board)
0
Set the center frequency of IC3701 chroma band-pass filter.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: 11, set data: 10, and press the PAUSE
button of the adjustment remote commander.
3) Check that the burst signal (B) is output to the chroma signal
terminal of S VIDEO jack.
4) Select page: 3, address: 0C, set data: 04, and press the PAUSE
button.
5) Select page: C, address: 28, and change the data for minimum
amplitude of the burst signal level (A).
(The data of address: 28, should be "00" to "07")
6) Press the PAUSE button.
7) Select page: 3, address: 0C, set data: 00, and press the PAUSE
button.
8) Check that the burst signal level (B) satisfies the specified
value.
9) Select page: D, address: 11, set data: 00, and press the PAUSE
button.
10) Select page: 0, address: 01, and set data: 00.
When the data of page: 3, address: 0C, is 04:
A
CH1
CH2
When the data of page: 3, address: 0C, is 00:
CH1
5-48
VTR stop
No signal
CH1: Chroma signal terminal of
S VIDEO jack (75 Ω terminated)
CH2: Y signal terminal of S VIDEO
jack (75 Ω terminated)
Oscilloscope
C
28
A = 100 mVp-p or less
B = 200 mVp-p or more
H
Fig. 5-3-9
H
Fig. 5-3-10
B