Va Gain Adjustment - Sony DIGITAL BETACAM DVW-707 Maintenance Manual

4-4. VA Gain Adjustment

Note
. Use an 89.9%-reflective chart (Reflection rate: 89.9 %)
in this adjustment as possible. (Refer to Section 4-1-4.)
. If a "16:9" chart is not keep on hand, shoot a "4:3" chart
so that the chart width is aligned with the underscanned
monitor frame.
Preparation
. OUTPUT/DCC switch (inside panel) → CAM/ON
. Shoot a grayscale chart (16:9) in the full underscanned
monitor frame.
. WHITE BAL switch (inside panel) → PRST
. AUTO W/B BAL switch (front panel) → BLK
(Perform the automatic black balance adjustment.)
. On the setup menu, set as follows.
PAGE : E35*PRESET WHT
ITEM : COLOR TEMP <P> : 3200
ITEM : R GAIN <P>
ITEM : B GAIN <P>
Adjustment Procedure
1. Select the 16:9 mode.
PAGE : E14*WIDE SCREEN
: 16:9/4:3 MODE → 16:9
ITEM
2. Equipment : Oscilloscope
Test point : TP1/VA-191
Setting point : 1 Lens IRIS
: A = 320 ± 8 mV
Spec.
A
3. On the setup menu, set as follows.
PAGE : E12*FUNCTION 1/2
: TEST OUT → G
ITEM
4. Equipment : Waveform monitor
Test point : TEST OUT connector
Adj. point : 1RV201/VA-191 (G GAIN)
: B = 100 ± 2 IRE (NTSC)
Spec.
B = 700 ± 10 mV (PAL)
B
DVW-790WS/709WS/707
DVW-790WSP/709WSP/707P P1
5. On the setup menu, set as follows.
16:9 mode
PAGE
ITEM
ITEM
6. Select portion C by using the waveform monitor.
7. Set the waveform monitor to the CHROMA mode.
8. Equipment
Test point
Adj. point
Spec.
: 0
: 0
Setting After Adjustment
. On the setup menu, set as follows.
PAGE
ITEM
4-4. VA Gain Adjustment
: E12*FUNCTION 1/2
: TEST OUT → ENC
: GAMMA → OFF
: Waveform monitor
: TEST OUT connector
: 1RV101/VA-191 (R GAIN)
1RV301/VA-191 (B GAIN)
: Minimize carrier leakage D by using
the variable resistors alternately.
D
: E12*FUNCTION 1/2
: GAMMA → ON
RV201
1
1
RV301
TP1
VA-191 Board (A side)
C
1
RV101
4-7