Ros CE-X-36, Руководство по эксплуатации и обслуживанию

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4 THEORY OF OPERATION
4.1 UNIVERSAL INTERFACE BOARD ASSEMBLY
The schematic diagram of the Universal Interface Board Assembly (Drawing 51-11098) is
included in the appendix to this manual. The schematic illustrates the Power Conditioning
circuits as well as circuits required to decode Focus, Zoom and Exposure commands. This
drawing also illustrates the elements that make up the Long Line Amplifier driver circuits.
Details of interconnections between the Universal Interface Board and the Mode Selector
Board assemblies are shown on Wiring Diagram (Drawing 51-11106).
4.1.1 Reverse Polarity Protection
Power to the CE-X, 36:1 camera is received through pin 3 with respect to pin 1 of
universal interface connector J1. CR1 serves as a steering diode to prevent
damage from accidentally reversed power connections to the camera.
4.1.2 Automatic Resettable Fuse Protection
RPS1 is a 500 mA “Polyswitch.” A Polyswitch behaves as a fuse that opens in case
of a severe current overload but then unlike a fuse, closes automatically once
circuit conditions return to normal.
4.1.3 Power Conditioning
Capacitor C9 provides filtering of the input power before it is presented to the main
power input regulator device, XVR1. This regulator pr10V through J3 pin 4
to the Camera Module. XVR1 is actually mounted external to the board on the
aluminum base plate of the camera in order assure adequate heat dissipation when
the camera is operated at higher input voltages.
The output of XVR1 is also used as an input to other power circuits:
a)
Regulator VR1 - Pr5V to the Zoom, Focus, Exposure control
circuits as well as the microcontroller.
b) U4 - a DC-DC converter that generates negative output then regulated by
VR2 to provide -6V to the video processing circuits.
c) VR3 - Pr6V to the video processing circuits.
4.1.4 Standard Control Circuit Operation
The Zoom, Focus, and Exposure control circuits are actuated by dc voltage inputs
from a remote control unit. These levels are applied to logic inverter circuits. When
the bi-polar control mode is selected these circuits detect the polarity of the
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