Sony DCRTRV900 - MiniDV Handycam Digital Video Camcorder, Service Manual, Page: 148 / 215

5-45
CH1
CH2
A
H
H
CH1 B
3-5. VIDEO SYSTEM ADJUSTMENTS
Before perform the video system adjustments, check that the
specified value of “27 MHz Origin Oscillation Adjustment” of
“CAMERA SYSTEM ADJUSTMENT” is satisfied.
3-5-1. Base Band Block Adjustments
1. Chroma BPF fo Adjustment (VI-151 Board)
Set the center frequency of IC1402 chroma band-pass filter.
Mode VTR stop
Signal No signal
Measurement Point CH1: Chroma signal terminal of
S VIDEO jack (75
Ω
terminated)
CH2: Y signal terminal of S VIDEO
jack (75
Ω
terminated)
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 2B
Specified Value A = 100mVp-p or less
B = 200mVp-p or more
Switch setting:
DISPLAY (Menu display) ............................ V-OUT/LCD
DISPLAY (CK-80 board) ............................................ ON
Adjusting method:
1)
Check that the burst signal (B) is output to the chroma signal
terminal of S VIDEO jack.
2) Select page: 0, address: 01, and set data: 01.
3) Select page: 3, address: 0C, set data: 04, and press the PAUSE
button of the adjustment remote commander.
4) Select page: C, address: 2B, and change the data for minimum
amplitude of the burst signal level (A).
5) Press the PAUSE button of the adjustment remote commander.
6) Select page: 3, address: 0C, set data: 00, and press the PAUSE
button of the adjustment remote commander.
6) Check that the burst signal level (B) is satisfied the specified
value.
7) Select page: 0, address: 01, and set data: 00.
When the data of page: 3, address: 0C, is 04:
Fig. 5-3-4
When the data of page: 3, address: 0C, is 00.
Fig. 5-3-5
2. S VIDEO OUT Y Level Adjustment (VI-151 Board)
Mode Camera
Subject Arbitrary
Measurement Point Y signal terminal of S VIDEO jack
(75
Ω
terminated)
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 25
Specified Value A = 1000 ± 14mV
Adjusting method:
1)
Select page: 0, address: 01, and set data: 01.
2) Select page: 2, address: 35. After note down the data of this
address, set data: 01 to the address.
3) Select page: 3, address: 0C, set data: 02, and press the PAUSE
button of the adjustment remote commander.
4) Select page: C, address: 25, change the data and set the Y signal
level (A) to the specified value.
5) Press the PAUSE button of the adjustment remote commander.
6) Select page: 3, address: 0C, set data: 00, and press the PAUSE
button of the adjustment remote commander.
7) Select page: 2, address: 35. and set the data that is noted down
at step 2).
8) Select page: 0, address: 01, and set data: 00.
H
A
Fig. 5-3-6