TROUBLESHOOTING
5-12
VersaPulse Select Service Manual
0621-499-01 12/95
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5.3 SERVICE MODE
The VersaPulse Select includes "service mode" software routines. Service mode provides the Servicing Engineer
with a number of troubleshooting and maintenance aids. Some system faults are ignored in service mode (see
5.4.3).
To enter service mode, the main processor and safety processor must see an off to on transition of CPU PCB SW1.
SW1 is the uppermost of the three switches located on the bottom left side of the CPU PCB. Note that if the switch
is left on when the system is powered up, it will not enter service mode (no off to on transition). If the processors
are halted (some faults are handled by halting the processor) the service switch will not work - restart the
processors (press reset switch SW2 on the CPU PCB) then toggle the service switch off to on.
Upon entering service mode the touch screen displays the first service screen (see figure 5-12). The first screen
includes the following functions:
AIMING BEAM CONTROL - sets the aiming beam to any of its four intensities (off, lo, med, high).
RATE CONTROL - set the firing rate from 5 to 40 Hz.
VOLTAGE CONTROL - sets the cap charge voltage from 700 to 1500 Volts.
READY/STANDBY SELECT
YAG HEAD ON/OFF SELECT - there is an on/off control for each YAG rod. Turning a rod off means
that it will not be triggered during a firing sequence. This allows for operating only one rod, or any
combination of rods.
Turning off a rod will result in a "skipped beat" out of each four pulses, e.g., if 40 Hz is selected
with one rod turned off, the pulse interval will be normal for three pulses, and then be doubled
(the rod turned off doesn't fire), then three more pulses and a double interval, and so on. The
irregular interval that results from having rods turned off is easily heard.
Turning rods off effects average power and the effective pulse rate, e.g., if only one rod is on, a
selected pulse rate of 40 Hz, will result in an actual pulse rate of 10 Hz, and an average power
approximately one fourth that @ 40 Hz (approximate in service mode because the rods are all
fired at the same cap voltage in service mode, and will have different energy outputs).
Once a rod is turned off in service mode, it remains off, even if the system is returned to user mode
or turned off and then back on.
AVERAGE POWER DISPLAYS - Each time the system is fired in service mode the three energy monitor
outputs are used to maintain an average power for each of the four rods. When the footswitch is released
these displays will be updated, showing the average power as determined by the three energy monitors
for each of the four heads. This is convenient for checking relative rod performance (all rods were fired
at the same cap voltage) and for checking for agreement between the three energy monitor circuits.
NEXT SCREEN - touch to move to the second or third screen.
Press the "RESET" button if "CALIBRTE" was pressed in error.
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