TROUBLESHOOTING
5-2
VersaPulse Select Service Manual
0621-499-01 12/95
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The safety processor circuits include a two digit, seven segment LED display mounted on the CPU PCB. The
software can use this display to indicate status or type of fault information to the service engineer.
There are two indicator bulbs inside the PFN enclosure. One bulb illuminates to indicate that the 400 VDC supply
for flashlamp simmering is present. The other indicator bulb flashes at a rate proportional to the charge on the
main charging capacitor.
5.1.2 Safety Precautions
Lethal voltages and Ho:YAG laser emission are the primary dangers to the Servicing Engineer. In addition to the
general safety precautions which always apply when working on electronics and lasers, the Servicing Engineer
must be aware of the following specific precautions:
Only Coherent certified Versapulse Select Service Engineers should attempt any service on this
system.
Even with the keyswitch in the "OFF" position there are potentially lethal voltages present inside the
console.
Storage capacitors inside the system are capable of holding a lethal charge, even after power has been
removed from the unit.
Do not touch the YAG Cavity Module - IT IS A SHOCK HAZARD. The YAG Cavity Module is
electrically isolated from the chassis ground and connected to the secondary of a transformer to
develop an electrical field around the flashlamps. The YAG Cavity Module is located in the laser head.
The Ho:YAG laser light is invisible to the human eye. Because the Ho:YAG energy can not be seen, there
is no visible indication of the primary or reflected beam. Eye protection that attenuates the Ho:YAG
wavelength to a safe level must be worn by all persons in the area of the laser system whenever the laser
is being serviced.
The Ho:YAG laser light and its reflections are potential burn hazards and can ignite flammable
materials. Use extreme caution when operating the system with covers opened or removed. The covers
contain the beam and reflections safely within the console. Only those persons required should be present
during servicing, and eye protection that safely attenuates the Ho:YAG wavelength must be worn by all
present.
The Ho:YAG laser light and its reflections are potential hazards to the eye. Use extreme caution when
operating the system with the covers opened or removed. The covers contain the beam and reflections
safely within the console. Only those persons required should be present during servicing and eye
protection that safely attenuates the Ho:YAG wavelength should be worn by all those present.
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