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Cavity/Manifold: After passing through the water particle filter, the coolant make its way to the laser
manifold where it enters the cavity. The cavity which mounts to the manifold contains a YAG rod and a
flashlamp, both contained in a glass-like material surrounded by barium sulfate powder (highly reflective).
The cooling water flows in direct contact with the YAG rod and flashlamp outer surfaces to remove the heat.
Water enters on one side of the cavity and exits the other. All openings are sealed by special o-rings which are
made of materials to withstand degradation by heat and UV exposure. Refer to fig. 4.2.
4.4 CONTROL ELECTRONICS
Refer to schematics 8-8 thru 8-17 in Section 8 and other associated schematics.
4.4.1 Overview
The control electronics excutes stored software instructions to safely operate the system in response to user
inputs. The microprocessor system provides overall control of the system operation. It includes the following
circuits/functions.
Microprocessor (µP) - Runs the main software program to provide overall control of system operation.
It includes a 68000 microprocessor and its supporting circuits - ROM, RAM, programmable timer,
EPLDs, clock, and microprocessor bus support circuits. Described in subtopic 4.4.2.
Shutter/Footswitch/Remote Interlock Circuit - Operates and monitors the position of the shutter;
detects footswitch position; and monitors the Remote Interlock connection. Described in subtopic
4.4.3
Servo Motor Circuit - Positions the servo motor to point the servo imaging mirror to the selected
Ho:Yag/Nd:YAG head. Described in subtopic 4.4.4.
HVPS & Lamp Control Circuits - Provides voltage level, lamp select, charge command, and trigger-
ing inputs to the HVPS and lamp control circuits. Monitors status line inputs from the HVPS.
Described in subtopic 4.4.5.
Energy Monitor Circuits - Provides two channels of YAG pulse energy monitoring. Described in sub-
topic 4.4.6.
LCD Color Display and Remote Control Circuits - Provides user display and input functions.
Described in subtopic 4.4.7
Aiming Diode Laser Circuit - Sets the aiming diode laser to its off, low, medium, or high intensity.
Described in subtopic 4.4.8.
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