Service manual

42
VL-Z1U
4) Operation flow
5) After completion of adjustment
Press the "CONTINUE" key to make the display "CAM ADJ" disappear.
Note: Before pressing the "CONTINUE" key, check that the unit is not in the auto focus adjustment mode or the camera signal
system adjustment mode (described later).
Æ Camera section adjustment mode
The auto focus adjustment mode and the camera signal system adjustment mode are used for adjustment of the camera section.
Note: The adjustment data are stored in the E
2
PROM as shown below. When making changes, it is therefore necessary to perform
rewriting of data and checking of the latest data.
1) E
2
PROM (IC705) on main unit
Lens-related data and signal system adjustment data
(3) Auto focus adjustment mode
· The camera of this unit features automatic focussing by means of a microcomputer.
The auto focus circuit of this unit performs focusing operation based on the principle that the high frequency component in the video
signal increases as focus is achieved. In addition, in order to achieve a large magnification with a small-size lens, the inner focus
system is employed in which a master lens (rear lens) is moved forward and backward for focusing. This inner focus system enables
full range focussing with a focal length range of 10 mm to infinite distance. However, because the maximum allowable distance
from the closest subject to the tele end is 1.5 m, a subject less than 1.5 m away from the tele end cannot be focused on if it is shot
at the tele end. In such cases, zooming-out is performed automatically for focusing.
The major factors of the auto focus system are as follows:
• Detection of master lens position
• Detection of iris position
• Detection of zoom lens reference position
These detection data are stored in the E
2
PROM.
Therefore (3) auto focus adjustment should be performed in the following cases.
• When the lens is replaced
• When the CCD is replaced
• When the E
2
PROM is replaced
• When the CCD circuit board and CAMHEAD circuit board are replaced
1) How to enter the auto focus adjustment mode
Set the data value at address "13FE" to " 01".
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The screen will be white-faded temporarily and the auto focus adjustment mode will be established.
* When the auto focus adjustment mode is established, make adjustment according to "(5) Camera adjusting procedure".
* In the auto focus adjustment mode, lens operation cannot be performed.
2) How to enter the normal mode
Set the data value at address "13FE" to " FF".
]
The screen will be white-faded temporarily and the normal mode will be established.
]
Pressing the "CONTINUE" key will make the display "CAM ADJ" disappear and make it possible to perform normal operation.
FF or REW PLAY PLAY STOPFF or REW
Select an address, confirm the selected address to call up the data,
adjust the data value, confirm the adjusted data value and return to address selecting.
3) Description of remote control keys
"FF" key: It is used to increase the address value and data value.
"REW" key: It is used to decrease the address value and data value.
"PLAY" key: It is used to confirm the selected address to call up the data. It is also used to confirm the data value.
"STOP" key: It is used to clear the data and make it possible to select an address.