Return Video Unit
KA-R25U
Product Information Manual
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The return video unit provides the GY-HD250U user with the ability to display the return
video signal from a camera control unit (CCU) through the GY-HD250U electronic
viewfinder (EVF) in studio configurations that do not use the KA-HD250U. This unit
requires that a third party CCU from Camplex or Telecast Fiber with appropriate
camera adapter cabling* be used to control this unit.
*NOTE: Camera adapter connection cables are sold separately by their respective companies:
Camplex Cable Part No. CAIC-23-D112
Telecast Fiber Cable part No. CHCS-B03-JVC-3B-X1-10D-REV#2
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The absence of the KA-HD250U enables the studio configured GY-HD250U to be
mounted on the shoulder, providing the videographer with mobility and positioning
flexibility.
Connection and Installation Instructions
1
2
4
3
1. GY-HD250U EVF Input (20-Pin Male)
This connection is used to provide the EVF output signal from the GY-HD250 to the
return video unit. Connect this plug to the GY-HD250U’s 20-Pin RGB viewfinder output.
2. Return Control Input (Wire)
This input is used to switch the unit’s output between the GY-HD250U’s VF video and
the return video. Connect his input to GY-HD250U’s 10-pin studio connector with the
wire supplied by either Camplex or Telecast Fiber camera adapter cabling (See
previous page for the respective third-party CCU cabling part numbers).
3. Return Video Input (BNC Male)
Connect the third-party camera adapter VBS return video signal to this BNC input.
4. EVF Output Connection (20-Pin Female)
Insert the GY-HD250U’s 20-pin EVF connector to this output.
Required Camera Settings
! Set the GY-HD250 menu selection “VF SIGNAL” to “RGB”.
! Set the GY-HD250 menu selection “Tally System” to “Studio”.
The EVF signal switching is controlled by the KA-R25U return video unit. The normal EVF
output is the GY-HD250U RGB signal. When the RET (return) button located on the lens
control handle is depressed and held down, a converted Black & White image of the return
video signal is shown in the EVF. Once the RET button is released, the KA-R25U switches
the EVF image back to the RGB signal from the camcorder.
Mounted View
The KA-R25U return video
unit mounts conveniently on
the GY-HD250U’s handle as
shown (right). The original
EVF and microphone can be
used after the return video
unit is mounted.
Specifications
GY-HD250U 20-Pin EVF Input: RGB
Return Video Input: VBS 1V p-p
Return Control Input: 5V - Black & White Return Video Output
0V - GY-HD250 EVF Video Output
EVF 20-Pin Output: RGB GY-HD250U EVF Video/RGB Return Video
Power Consumption: 182mW
Weight: Approx 0.2 lbs
Included Mounting Screws: M2.6 6mm Round Head x 2
M2.6 4mm Flat Head x 1
JVC Professional Products Co.
1700 Valley Road
Wayne, New Jersey
07470
Design and specifications subject to change without notice.
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