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6-26
18. Electronic viewfinder system adjustments
(VF-102 board)
Note :
About 2200V dc is applied to CRT anode and about 200
Vdc to the grid. Be careful not to touch them. If hand
touches them, there is danger of electric shock
Preparation :
1.
Disconnect a flexible board from CN901 on VF-102 board.
2.
Connect equipments as follows.
Required signals
1.
Monoscope signal
Output amplitude:
1.0 Vp-p (75
Ω
terminated)
Horizontal resolution:
600 TV lines or more
Vertical resolution:
350 TV lines or more
2.
Dot pattern signal
Output amplitude
1.0 Vp-p (75
Ω
terminated)
3.
Contrast signal
Output amplitude
0.5 Vp-p (75
Ω
terminated)
fH :
15.750kHz (NTSC)
15.625kHz (PAL)
fV :
60Hz (NTSC)
50Hz (PAL)
Others: Complies with NTSC and PAL. (Refer to Fig. 6-1-12.)
Fig. 6-1-11
1
2
4
5
3
Following signals
+4.85Vdc
CN901
pattern
generator
regulated dc
power supply
9
µ
S
0.2V
0.3V
18-1. Power supply voltage check
Measuring Instrument
Digital voltmeter
EVF5V
Measurement Point
CN901 Pin
1
Specification Value
4.65 + 0.1Vdc
18-2. Horizontal and vertical position
Purpose :
Maintains horizontal position.
Adjustment error :
Horizontal position cannot be maintained.
Signal
Monoscope signal
Adjustment
RV905
Specification Value
Overscan 3.5
±
3.5%
(horizontal) (one side)
Overscan 4.5
±
5% (vertical) (one
side)
Adjustment procedure:
Order
Procedure
1
Confirm that the horizontal and vertical picture sizes
satisfy the specification values.
18-3. BRIGHT adjustment
Signal
Monoscope signal
Measurement Point
CRT screen
Adjustment
RV904
Specification Value
Each step of gray scale signal is
displayed clearly.
Adjustment procedure:
Order
Procedure
1
Adjust RV904 until each step of gray scale signal is
clearly display. (For the brighter region, do not
increase brightness to such an extent that the cross-
hatch at the center of monoscope signal becomes
flared. For the dark region, do not decrease brightness
to such an extent that the first step (the darkest step)
and the third step cannot be identified.)
RV904
1
5
CN901
RV905
4.5%
3.5%
VF-102 BOARD (SIDE A)
Fig 6-1-12
Содержание CCD-TRV312 Operating Instructions (primary manual)
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Страница 66: ...312 TRV512 NTSC 4 73 4 74 page 4 66 for VF 109 BOARD printed wiring board ...
Страница 72: ...53 TRV312 TRV512 NTSC age 4 89 for PD 76 BOARD printed wiring board 4 100 ...
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