JVC TK-C920U
Owner's Manual

35

LENS ADJUSTMENT
Video adjust

�G

G
IRIS
VIDEO DC

L

H

LEVEL

Connect the camera according to the connection method, turn it on, display an image on the monitor, and check the image. The camera has been factory-adjusted to the best position, but it may need to be adjusted according to the object conditions or combination of lenses. If the image is unnatural, adjust it as follows: � LEVEL adjustment Monitor screen LEVEL turning direction Too bright Counterclockwise (Toward L) Too dark Clockwise (Toward H) ALC turning direction Clockwise (Toward Pk) Counterclockwise (Toward Av)

50

LEVEL

58 55

Av Pk L H

� ALC adjustment Monitor screen Part (high-intensity part) of the screen halates. Other part of screen (except high-intensity part) darkens.
BF LOCK

ALC LEVEL

ALC

* If the sensitivity adjustment LEVEL is turned excessively to L, the sensitivity increases because of the AGC function of the camera, and the image looks grainy. * If the video iris lens is set to too low a level, malfunction such as the hunting phenomenon, in which the iris opens or closes unintentionally, may occur. In such a case, first set LEVEL potentiometer on the lens to the H (iris open) position then adjust it to the optimum level.

H
4

I

Back focus adjustment

The back focus has been factory-adjusted to the best point for CS-mount lens, but it may need to be re-adjusted if the mount is changed to the C-mount or if a different lens is used. If required, adjust it as follows:

�H

1,5

If the focus can not be adjusted correctly by rotating the lens focus ring, adjust the back focus as follows. 1. Loosen the back focus locking screw by turning it counterclockwise ( ) with a screwdriver. 2. Shoot a pattern closely. 3. Turn the lens focus ring to . 4. Turn the back focus adjustment ring to focus at the best point. 5. Tighten the back focus locking screw by turning it clockwise ( ). * When using a zoom lens, adjust the focus for telephoto wide-angle and maximum wide-angle.

SETTING SWITCH
White-spot correction

�I

J

8 7 6 5 4 3 2

8 7
OFF OFF OFF AUTO LL PHASE R ON-AGC ON-AES ON-BLC MAMU DC12V INT WHT. AC24V BAL B 1 2 CLASS 2 ONLY(U TYPE) ISOLATED POWER ONLY (E TYPE)

6 5 4 3
POWER

OFF OFF OFF AUTO LL R

ON-AGC ON-AES ON-BLC MANU INT WHT. BAL B

As a general characteristic unique to CCD, white spots may appear on the screen. Take the following steps in order to reduce the number of white spots. 1. Attach the lens cap, switch on the camera power supply and wait for 30 minutes. 2. Remove the sticker and press and hold the switch for more than 2 seconds using a thin rod. * Do not use a metal rod. * The white-spot correction feature of this unit does not guarantee the correction of all white spots.

PHASE

VIDEO OUT
SEE INSTRUCTION MANUAL POWER
RESET

RESET

SEE INSTRUCTION

VIDEO OUT

MANUAL

1

TK-C920

1

TK-C921

1. Turn switch r to �LL�; 2. Turn switch e to �PHASE�; 3. Press the + or � button w to make the phase variable. Adjust with the button w so that the vertical phase of the camera matches the vertical phase of another camera (or system) with a multi-channel oscilloscope. For initial setting, press RESET button q.

Line Lock (U type : 60Hz power region only E/EG type : 50Hz power region only) To set the camera in LL mode for synchronization with the power supply frequency, take the following steps:

�J

White Balance

K
U1-32 50

126 115

BF LOCK

COLOR VIDEO CAMERA

51

TK-C920

30

1/4-20 UNC

White balance can be adjusted within the scope of 2300K to 10000K color temperature. When switch t is at �AUTO�, the white balance is adjusted automatically. * When Hunting Auto Tracking White Balance symptoms occur when using an Auto iris lens with switch positions of AGC is on, AES is on, Int-lock with AC24V Power source, turn switch r to �LL�. * When Hunting Auto Tracking White Balance symptoms occur when using a Manual iris lens with switch positions of AGC is on, AES is on, Int-lock with DC12V Power source, please adjust or close iris ring on the lens. For manual adjustment, take the following steps: 1. Turn switch t to �MANUAL�; 2. Turn switch e to �WHT.BAL�; 3. Pressing �R� button w increases redness while pressing �B� increases blueness. For initial setting, press RESET button q. There are cases sometimes when the white balance cannot be adjusted manually for artifical lights such as fluorescent lights, etc.

32.5

BLC (Back Light Compensation)
The switch y improves an image that is darkened because of backlighting. Set this switch to ON for backlight subjects.

AES (Automatic Electronic Shutter)
Turning this switch u "ON" when a lens with a manual iris diaphragm is used enables the automatic adjustment of image brightness. In this case the shutter speed changes according to the brightness of the subject.
U1-32 65 126 115

* Hunting may occur at a certain object brightness due to the mechanism of the AES circuit, but this is not a fault.

AGC (Automatic Gain Control)
BF LOCK

DIGITAL
42 30

COLOR VIDEO CAMERA

The switch i automatically increases the camera�s sensitivity when the level of ambient light drops. ON: AGC is activated. OFF: AGC is not activated.

62.5

SPECIFICATIONS
1/4-20UNC

TK-C921

®
Printed in Thailand LWT0124-001B-H
VICTOR COMPANY OF JAPAN, LIMITED
® ®

©2004 VICTOR COMPANY OF JAPAN, LIMITED

: 1/3-inch interline-transfer CCD : TK-C920U : 768 (H) � 494 (V) TK-C920E/TK-C921EG : 752 (H) � 582 (V) Synchronization method : Internal Line lock (U type 60 Hz, E/EG type 50 Hz regions only) Scanning frequency : U type : (H) 15.734 kHz (V) 59.94 Hz E/EG type : (H) 15.625 kHz (V) 50 Hz Resolution : 535 TV line (H) Typ. Video output : Composite video signal 1 V (p-p), 75 , unbalanced Video S/N ratio : 50 dB (AGC OFF) Minimum required illumination : 0.7 lx (F1.2, AGC ON, 25%) Lens mount : C/CS mount Power supply : TK-C920U : AC24 V ~ 60Hz DC12 V 4.7 W and power consumption TK-C920E : AC24 V ~ 50/60Hz DC12 V 380 mA TK-C921EG : AC220 V-240 V ~ 50/60Hz, 57 mA Ambient temperature : �10�C to 50�C (operation) 0�C to 40�C (recommended) Mass : TK-C920: 370 g TK-C921: 710 g DIMENSIONS (Unit: mm) (Design and specifications are subject to change without notice.)

Image pickup device Number of effective pixels

�K

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