Viewfinder System Adjustment; Heater Voltage Pre-Adjustment; Focus Adjustment - Sony DXF-20W Service Manual

2-2. Viewfinder System Adjustment

2-2-1. Heater Voltage Pre-Adjustment

Note
When performing this adjustment, check "2-2-5. Bright
Calibration Adjustment".
Preparation
. Measuring equipment: Digital voltmeter (AC mode)
Adjustment procedure
Check the following voltage.
TP3 ↔ TP4/VF-88 board
. Test point:
. Specification: 0.635 ± 0.015 V rms
If the above specification is not met, adjust 1RV4 (VH-
ADJ)/VF-88 board so that the specification is met.
VF-88 board
RV4
VF-88 board
2-2 (E)
TP4
TP3
RV3 RV1
RV2

2-2-2. Focus Adjustment

Note
This adjustment and "2-2-3. Horizontal Frame Adjust-
ment", "2-2-4. Heater Voltage Adjustment" and "2-2-5.
Bright Calibration Adjustment" affect with each other.
Therefore, repeat the adjustment until all specifications are
met.
Preparation
. Object: Resolution chart
. Measuring equipment: Waveform monitor
. Lens
IRIS AUTO/MANU → MANU
. Viewfinder
→ Mechanical center
BRIGHT control
CONTRAST control → Fully clockwise 2
→ Fully counterclockwise 3
PEAKING control
Adjustment Procedure
1. Adjust the lens zoom so that the resolution chart
frame coincides with the underscanned picture frame
on the monitor screen.
2. Set the resolution on the monitor screen to the best
state with the lens focus.
Monitor screen
3. Adjust the lens iris so that the white level at VIDEO
OUT connector on the camera is as follows.
For NTSC: 100 ± 2 IRE
700 ± 14 mV
For PAL:
4. Adjust 1RV3 (FOCUS)/VF-88 board so that the
picture on the viewfinder screen is best focused.
DXF-20W