Sharp VL-A10U Service Manual page 34

VL-A10U/UC/UA/UW/T/K
VL-AH30U/UC/T
6-4-2-1. Checking the power supply voltage
Measuring terminal:
P-CON 4.9V
P-CON 3.1V
CAM 15V
CAM -8V
LENS 5.7V
Measuring instrument: Digital voltmeter
6-4-2-2. 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 70)
2) Write the adjustment data 09, 0A and 0B one after the other to the address 71, 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 12, 06, 08 and 0D one after the other to the address 71. The adjustments are as above.
Write FF to the address 70 to exit the auto focus adjustment mode.
6-4-2-3. 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 70)
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 286mVp-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 9C 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
71
09, 0A, 0B
More than 50 m away
—
None
71
12, 06, 08, 0D
Anything
—
VIDEO OUT (Terminated in 75 )
74
286mVp-p
Gray scale
—
VIDEO-OUT
9C
700mVp-p
Anything
—
None
71
01
DATA Adjustment
09 Hall offset
0A Iris offset
0B Iris close
DATA Adjustment
12 Optical wide-end adjustment
06 Wide-end focus
08 Tele-end focus
0D Zoom tracking adjustment
1H
1) Write the data 01 to the address 71.
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.
34
position adjustment
position adjustment
Video
SYNC
286mVp-p
700mVp-p