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SERVICE MODE
Service mode is a privileged mode of operation for use by manufacturing and service personnel. Service mode
shall be entered by toggling the service mode switch on the Controller PCB. Access to the switch will require
the use of a tool to open the laser console. Service mode will provide the following functions:
1. Service Firing.
In service firing, the user will be able to fire any laser or combination of lasers at a chosen pulse rate
and pump energy; except that in a dual-wavelength system it shall not be possible to fire Holmium
and Nd:YAG lasers at the same time.
In service firing, the system will not control laser output energy, nor shall it assert errors associated
with pulse energy or pulse rate.
2. System Calibration
In system calibration, the system will fire each laser rod at two specified pump energies, shall measure
the laser pulse energy at each pump energy and calculate the relation between pulse energy and pump
energy for each rod.
The pump energy vs. pump energy relation will be calculated to give the slope and intercept coeffi-
cients in the formula
Pump energy = slope* pulse energy + intercept
If these coefficients are within limits which will not be specified in this document, but shall be deter-
mined by the Laser Engineer as he/she deems appropriate, the coefficients will be stored in NVRAM
and used to set the pump energy when performing a treatment. The software engineer will be respon-
sible for certifying that the system obeys the limits as specified.
When calibration is completed, the system will measure the optical transmission of the low-energy
attenuator at each wavelength in use.
After completing the above, if the system is in Service mode, it will perform all necessary functions,
including safety tests, that are required to operate normally in User mode.
3. NVRAM Initialization.
This function will initialize appropriately all values in non-volatile RAM.
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