TROUBLESHOOTING
5-1
VersaPulse Select Service Manual
0621-499-01 12/95
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5.0 TROUBLESHOOTING
5.1 OVERVIEW
5.1.1 Service Philosophy
The Versapulse Select is designed to require little adjustment or calibration, and to detect and report hardware
malfunctions by fault code, displayed on the control panel. In most cases field failures are repaired by changing
out a Field Replaceable Unit (FRU). FRU's are built specifically to support field repair, and consist of a part or
group of parts determined to be suitable for field replacement. When a part fails that is a part of a FRU, the FRU
is replaced, not the individual part.
Corrective and preventive maintenance must only be accomplished by a Service Engineer who has completed
Coherent certification service training on the Versapulse Select.
Field calibration and adjustment is covered in detail in Section 3. Special purpose tools are required to maintain
the Versapulse Select. These tools are listed in Section 6.
The entire optical path is enclosed inside the laser head. Removing the dust cover exposes the interior to foriegn
matter (dust, cookie crumbs, your hands). Minimize this exposure by removing the cover only when necessary,
using a clear palstic cover over the head while the dust cover is off, and getting the dust cover back on as soon
as maintenance inside the head is complete.
After power up, and before the VersaPulse Select moves to its standby condition, the software performs a series
of self tests. Self test failures result in fault codes displayed at the touch screen. These fault codes provide an
indication of what malfunction was detected, which should point to a specific area of the system for further
investigation. Explanations of the fault codes are included in this section. Most hardware malfunctions will be
detected at this time.
During normal operation the software continues to monitor for system malfunctions, and to report any detected
malfunctions by fault code at the touch screen.
The Versapulse Select has a series of service software routines available to the service engineer. The routines are
contained in the software EPROM, and are activated by pressing a button on the Controller PCB (not accessible
to the user). These routines facilitate calibration and troubleshooting. The routines are described in detail later in
this section.
A service attenuator is built into the optics bench, and can be placed in the beam path by operating a switch on
the Shutter PCB. The service attenuator can be used during servicing to decrease the power of the treatment beam
before it enters the fiber focus assembly. This can prevent damage to an attached fiber and/or the blast shield
when the laser is fired before the fiber focus alignment has been confirmed.
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