Vertical Frame Adjustment (For Ntsc) - Sony DXF-20W Service Manual

2-2-7. Vertical Frame Adjustment (For NTSC)

m
. The following is the adjustment of the NTSC system
video camera and viewfinder.
. When adjusting the viewfinder used in the PAL system
video camera, perform the "Adjustment procedure (For
PAL)".
Preparation
. Measuring equipment: Waveform monitor
. Remove the eye cap from the viewfinder.
. Viewfinder
→ Mechanical center
BRIGHT control
CONTRAST control → Mechanical center
→ Fully counterclockwise 3
PEAKING control
Adjustment procedure
1. Attach the viewfinder to the NTSC system video
camera.
2. Adjust the lens zoom so that the resolution chart frame
coincides with the underscanned picture frame on the
monitor screen.
3. Set the resolution on the monitor screen to the best
state with the lens focus.
4. Adjust the lens iris so that white level at VIDEO OUT
connector on the camera is 100 ± 2 IRE.
5. Adjust 1RV103 (V-SIZE: N)/DF-70 board so that the
V size of resolution chart is underscanned by approxi-
mately 2 mm from the CRT picture frame.
Viewfinder screen
DXF-20W
CRT frame
Chart frame
Approx. 2 mm (V size)
Adjustment procedure (For PAL)
1. Attach the viewfinder to the PAL system video
camera.
2. Adjust the lens zoom so that the resolution chart frame
coincides with the underscanned picture frame on the
monitor screen.
3. Set the resolution on the monitor screen to the best
state with the lens focus.
4. Adjust the lens iris so that white level at VIDEO OUT
connector on the camera is 700 ± 14 mV.
5. Adjust 1RV104 (V-SIZE: P)/DF-70 board so that the
V size of resolution chart is underscanned by approxi-
mately 2 mm from the CRT picture frame.
(When 1RV103 is not adjusted, the adjustment may
not be performed by just 1RV104. In such case, adjust
1RV104 after roughly adjusting by 1RV103.)
Viewfinder screen
DF-70 board
CRT frame
Chart frame
Approx. 2 mm (V size)
2-7 (E)