Sharp VE-CG30U Service Manual page 17

5-2-2-4. Common bias DC voltage adjustment
Address: 0509
Measuring point: TL1842
TL1832 (GND)
Adjustment specification: 6.3V±0.1V
5-2-2-5. Video output level adjustment
Address: 0065
Measuring point: TL407
TL411 (GND)
Adjustment specification: 0.28V±0.01Vp-p
5-2-3. Camera circuit adjustment
• Preparation before adjustment and check items
(1) Illuminate the entire pattern evenly with luminance of approx. 2000 lux(In the white chart) (2 or more light sources
are recommended). Set the color temperature to 3200K.
(2) Use a new test pattern with no soil or color degradation.
(3) If defects are found in the electric circuit, identify the defective part using the measuring instrument and repair/
replace it before adjustment.
5-2-3-1. Focus infinity adjustment
[Purpose]
Focus point in each zoom position of the lens is memorized to correct the focus tracking position when operating
the zoom lens.
[Object]
Siemens Star Chart via the collimator or an object with simple and distinct outline.
If you do not have a collimator, perform adjustment while shooting an object with distinct outline from a long
distance.
Since the lens is automatically moved from Wide to Tele during adjustment, do not put an object in front of the
camera (do not shoot an object with a distinct outline when the lens is located at Wide).
[Procedure]
• After making the settings above, set <TEST 7> according to the procedures of 5-1 and execute it.
• Auto adjustment is performed.
Each optical zoom position is set, and the focus infinity position at that time is stored in memory.
• During adjustment, <EXECUTING> and the object are displayed on the LCD monitor.
• Data is collected while changing the zoom from Wide to Tele. Do not place any obstacles in front of the camera
until the adjustment is completed.
• If <OK> appears on the LCD monitor, adjustment is completed.
5-2-3-2. Adjustment for CCD pixel defect detection
[Purpose]
To memorize and correct the CCD imager's white balance defect in the dark and black balance defect in the
brightness.
[Object]
An evenly illuminated white object under the lighting described in "Preparation before adjustment and check
items" (a light box can be used).
[Procedure]
• After making the settings above, set <TEST 5> according to the procedures of 5-1 and execute it.
• Auto adjustment is executed.
The lens is automatically shielded from the light and white balance in the dark is corrected.
Next, the aperture of the lens is automatically opened and black balance in the brightness is corrected while
a white object is shot.
• During adjustment, <EXECUTING> and the object appear on the LCD monitor.
• If <OK> appears on the LCD monitor, adjustment is completed.
(1) Connect the digital voltmeter to TL1842.
(2) Select the address 0509 and set the address.
(Color Bar pattern appears onLCD Display)
(3) Set the data of the DC voltage to a specified value using
(1) Connect the oscilloscope to TL407.(Video out; 75Ω termination)
(2) Select the address 0065 and set the address. (No signal on LCD Display)
(3) Set the level of H-SYNC to the adjustment specified value using
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VE-CG30U
VE-CG40U
or key.
or key.