Sharp VL-H870S Service Manual page 35

VL-H860S/H/VL-H870S
VL-H890S/VL-H94E
VL-H96E/VL-H960E
5-4-2-1. Checking the power supply voltage
• Measuring terminal: CAM 4.9V
CAM 2.8V
CAM 3.1V
CAM 15V
CAM -7V
LENS 5V
• Measuring instrument: Digital voltmeter
5-4-2-2. Auto focus adjustment
• Basic iris adjustment
Measuring instrument None
Subject
Tape
Test point
Adjustment address
Adjustment level
1) Set up the auto focus adjustment mode. (Write 01 to the address 1FE)
2) Write the adjustment data 09, 0A and 0B one after the other to the address 1FF, the adjustment are as above.
• Lens adjustment
Measuring instrument None
Subject
Tape
Test point
Adjustment address
Adjustment level
1) Set up the auto focus adjustment mode.
(This is unnecessary after the above basic iris adjustment has been made.)
2) Write the adjustment data 11, 12, 06, 08 and 0D one after the other to the address 1FF. The adjustments are as above.
Write FF to the address 1FE to exit the auto focus adjustment mode.
5-4-2-3. Adjustment of Camera signal
• Before starting these adjustment, auto focus adjustment must be finished.
• Set up the camera signal adjustment mode (Write 00 to the address 1FE)
1. Sync level adjustment
Measuring instrument Oscilloscope
Subject
Tape
Test point
Adjustment address
Adjustment level
1) Connect the oscilloscope to the VIDEO-OUT. Adjust the sync
level to 300mVp-p.
2. Iris AE adjustment
Measuring instrument Oscilloscope
Subject
Tape
Test point
Adjustment address
Adjustment level
1) Shoot the gray scale in the standard way. Observe the VIDEO-OUT signal on the oscilloscope screen and rewrite the data of
address 1FC to get an amplitude of 700mVp-p as shown above.
3. Black balance , AF noise level adjustment
Measuring instrument None
Subject
Tape
Test point
Adjustment address
Adjustment level
—
—
None
1FF
09, 0A, 0B
More than 50 m away
—
None
1FF
11, 12, 06, 08, 0D
Anything
—
VIDEO OUT (Terminated in 75Ω)
1F8
300mVp-p
Gray scale
—
VIDEO-OUT
1FC
700mVp-p
Anything
—
None
1FF
01
DATA Adjustment
09 Hall offset
0A Iris offset
0B Iris close
DATA Adjustment
11 Voltage adjustment
12 Optical wide-end adjustment
Wide-end focus ∞ position adjustment
06
Tele-end focus ∞ position adjustment
08
0D Zoom tracking adjustment
1H
1) Preparation : Write FF to address 19C, 19D, 19E, 19F, 1AO,
1AI.
2) Write the data 01 to the address 1FF.
The following adjustments are automatically
1 Black balance adjustment
carried on ;
2 AF noise level adjustment
at AGC Gain Min , AGC Gain Max and Gain up.
3) Data processing after adjusting the noise level calculation
formula (Round off fractions).
5-14
VL-H870U
VL-H860S/H/VL-H870S
VL-H875U
VL-H890S/VL-H94E
VL-H890U
VL-H96E/VL-H960E
Video
SYNC
300mVp-p
700mVp-p