- 3 -
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Image signal YCrCb is processed with enhancement, noise reduction, frozen image and Red and
Blue gain in the FPGA.
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Digital signal for pump transferred in serial from the CPU part is converted into analog signal and
sent to Peripheral control part to control the pump.
(3)
CPU part
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Stores the fix characters like “AGE” and manages entered characters from the keyboard. Sends
them to the Processing part to merges them to the image data in the FPGA on the Process part.
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Manages a real time clock.
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Analog signal that varies depending on which button on the front panel is pressed is converted into
digital signal and sent to the CPU. The CPU sends the instruction depending on the digital signal
by the serial transfer to the Process part.
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Sends the trigger signal to the out control ports through I/O part.
(4)
Encoding part
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10 bit R,G,B signal is encoded into Y/C, RGBS, and composite video signals and sent to I/O part.
(5)
Peripheral control part
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Detects the scope lock signal and lamp door switch signal.
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Controls the lamp power supply part of the unit (PS1), Sensor board (O700), the iris motor (MOT1)
and Pump(PM1).
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Supplies Unit fan (FAN3) and Blower fan (FAN2) with DC power.
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In the case detecting the error signal from Unit fan (FAN3) when the fan stops by accident, it
controls to shut down Lamp power supply (PS4)
(6)
DC power supply part
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Receives DC 12V and converts to 3.3V and 5V with the DC/DC converter and the three terminal
regulator.
(7)
I/O part
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The output levels of the video signals Y/C, RGBS and composite video is adjusted to the video
signal standards by the video amplifier.
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Trigger signals go through this part.
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Video connectors, trigger ports and keyboard connector are connected to this part.
2)
Integrated power supply unit (PS1)
This DC power supply unit consists of the following three parts in terms of the DC voltages.
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Su5, +15VDC to the patient circuit part of Process board (E700). Because this part is
connected to the patient circuit that is isolated from the secondary circuit of Process board it is also
isolated from the chassis grounding level.
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Su12VDC to the secondary circuit part of Process board (E700).
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Su15VDC to the lamp.
3)
Sensor board (O700)
It is located just behind the lamp rotary disk and detects which lamp (No.1 or 2) is in the light axis
position. It has two photo sensors on it. It differentiates the two lamps by the one of the two sensors
being interrupted by a tab on the lamp rotary disk.
4)
Lamp rotation disk
Lamp holding structure with sliding plates is available. The disk is driven by a gear and motor (MOT1).
The rotation is controlled by the position sensors (above) but limited with stoppers on the disk.
