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

5-4. VA Gain Adjustment

Note
. Use an 89.9%-reflective chart in this adjustment as
possible. (Refer to Section 5-1-4.)
Preparation
. OUTPUT/DCC switch (inside panel) → CAM/ON
. Shoot a grayscale chart 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. Equipment : Oscilloscope
Test point : TP1/VA-191
Setting point : 1Lens IRIS
: A = 320 ± 8 mV
Spec.
A
2. On the setup menu, set as follows.
PAGE : E12*FUNCTION 1/2
: TEST OUT → G
ITEM
3. 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
4. On the setup menu, set as follows.
PAGE
ITEM
ITEM
5. Select portion C by using the waveform monitor.
6. Set the waveform monitor to the CHROMA mode.
7. Equipment : Waveform monitor
Test point
Adj. point
: 0
: 0 Spec.
Setting After Adjustment
. On the setup menu, set as follows.
PAGE
ITEM
5-4. VA Gain Adjustment
: E12*FUNCTION 1/2
: TEST OUT → ENC
: GAMMA → OFF
C
: TEST OUT connector
: 1RV101/VA-191 (R GIAN)
1RV301/VA-191 (B GAIN)
: Minimize carrier leakage D by using
D
the variable resistors alternately.
: E12*FUNCTION 1/2
: GAMMA → ON
RV201
1
1
RV301
TP1
VA-191 Board (A side)
1
RV101
5-5