5-3
DNW-7/90/90WS
VA-191/167 Board (A side)
1
RV101
1
RV201
TP1
1
RV301
5-4. VA Gain Adjustment
Note
.
Use a reflective chart (Reflection rate : 89.9 %) in this
adjustment as possible. Adjust the color temperature to
3200 K exactly. If a pattern box is used, check it’s state
before use. Set the luminous intensity of the chart to
2000 lx.
Preparation
.
OUTPUT/DCC switch (inside panel)
→
CAM/ON
.
Shoot a gray-scale chart in the full underscan’s picture
frame.
.
WHITE BAL switch (inside panel)
→
PRST
.
AUTO W/B BAL switch (front panel)
→
BLK
(Perform the automatic black balance adjustment.)
Adjustment procedure
1.
Equipment
: Oscilloscope
Test point
: TP1/VA-191 (VA-167)
Setting point :
1
Lens IRIS
Spec.
: A = 280
±
8 mV
2.
On the setting menu, set as follows.
PAGE
: FUNCTION 1/2
ITEM
: TEST OUT
→
G
3.
Equipment
: Waveform monitor
Test point
: TEST OUT connector
(inside panel)
Adj. point
:
1
RV201/VA-191 (VA-167)
Spec.
: B = 100
±
2 IRE (NTSC)
B = 700
±
10 mV (PAL)
5-4. VA Gain Adjustment
C
D
A
B
4.
On the setting menu, set as follows.
PAGE
: FUNCTION 1/2
ITEM
: TEST OUT
→
ENC
ITEM
: GAMMA
→
OFF
5.
Select portion C by using the waveform monitor.
6.
Set the waveform monitor to the CHROMA mode.
7.
Equipment
: Waveform monitor
Test point
: TEST OUT connector
(inside panel)
Adj. point
:
1
RV101/VA-191 (VA-167)
1
RV301/VA-191 (VA-167)
Spec.
: Minimize carrier leak D by using the
variable resistors alternately.
Setting after adjustment
.
On the setting menu, set as follows.
PAGE
: FUNCTION 1/2
ITEM
: GAMMA
→
ON
