950-0073-00 B SM, English, Arthrex Synergy UHD4 System 44 of 74
3.3 CAMERA CONTROL UNIT
The CCU is intended to sit on a rack outside of the patient’s sterilized field. It provides
power and connection to the Camera Head and all peripherals.
CCU Components
There are four major sections within a CCU chassis: Power Supply, LED Illuminator,
Motherboard and Isolation Board.
The power supply accepts universal AC input voltages for use in international user
environments. It provides +12V power for the entire system. This power is active
whenever AC is supplied and is then switched On and Off by the CCU circuitry in
response to the front power switch. Power defaults to On when AC is first supplied.
The LED Illuminator consists of a high power LED and related control circuitry. It is
activated by camera control logic within the FPGA on the Motherboard. This section also
contains a cooling fan for the LED Illuminator. An additional fan is provided to exhaust
heat from the chassis directly. The LED Illuminator is defaulted to Standby when AC
power is first applied to the CCU.
The Motherboard and Isolation Board handles all image processing and control functions
as described below.
Overall CCU Circuitry
Figure 2131 depicts the camera circuitry, Motherboard and Isolation Board, with those
blocks providing Essential Performance shown at its right.
Blocks depicted in the upper left side of Figure 211 are under software control. They
provide for the user interface from a Tablet computer, recording of video stills and clips,
and printouts.
Software can also overlay information onto the main video image, along with (picture-in-
picture) video images from the DVI input port. This functionality is defeated should there
be a software timeout error.
A membrane panel on the front of the CCU provides for control buttons and LED
indicators. These are split between the essential section (for LED Illuminator control and
White Balance) and the software section (for USB activity LEDs).
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