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The contacts 3 to 2 and 14 to 15 of U17 closes. Closing these contacts resets the main
zero correction and the integrator. Closing the contacts 14 to 15 discharges C25 and
C149 to reset the integrator circuit.
• U9 in the safety energy detection channel.
The contacts 3 to 2 and 14 to 15 of U9 closes. Closing these contacts resets the safety
zero correction and the integrator. Closing the contacts 14 to 15 discharges C12 and
C150 to reset the integrator circuit.
U40 also outputs a /4MS/ signal to reset the main and safety peak/hold detectors.
R3 and R4 on the Optics Bench PCB and R15, R61, R32, R34 on the Controller PCB sets the gain of the energy
monitor circuits. These pots are to be adjusted during the energy monitor calibration procedure.
4.4.7 User Interface and Remote Control Circuits
Refer to page 8-9 in Section 8. The LCD touch screen display receives operator inputs from the user and
displays the system status/operating parameters to the user.
The LCD touch screen display is a combination of an Liquid Crystal Display placed behind a digital touch
screen assembly.
The microprocessor writes screen information to the System Dual UART U42 controller. The UART transmits
the data (MAIN_DISPLAY_TX) in serial form on the TXDA line to the differential driver U38. U38 translates
the single line input into a differential signal out on pins 5 and 6 to the LCD color display. The LCD screen
provides parameters, status indications and marks off areas of the screen for user inputs.
4.4.8 Aiming Diode Laser Circuit
Refer to page 8-9 and 8-16 in Section 8 and the Aiming Diode Laser Simplified Diagram (Fig. 4.6). The
aiming diode laser module is mounted on the optics plate, just prior to the fiber focus assembly, and after the
safety shutter (the safety shutter can not block the diode aiming beam). The diode output is directed by a
folding mirror to a beam combiner. Both the folding mirror and diode mount are adjustable, providing a far
and near adjustment respectively to place the aiming beam coaxial to the treatment beam.
The aiming laser is supplied with a regulated 5 VDC through J13-1 on the Controller PCB. The regulated +5
VDC supply is switched through Controller PCB P-Channel MOSFET Q9. Q9 is turned on or off by the /
LASER_DIODE_ON/ signal from the digital I/O EPLD U49 to turn the aiming beam on or off.
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