CHAPTER 5: MAINTENANCE
LW500A/LW600A PULSED Nd:YAG LASER
5-4 990-539
Code LCD Screen HV Alarm Corrective Actions
09
Oscillator Temperature
OFF ON
A high temperature has been detected on the Oscillator base
plate. Turn the Laser off for 10 minutes and allow the heat to
dissipate. Possible causes:
– The Laser is fired repeatedly into a closed shutter.
– An optical component is overheated.
– High ambient temperature.
10 High Temperature of Coolant OFF ON
The secondary cooling water temperature is >104ºF (40ºC).
Verify temperature with a thermometer. Possible causes:
– Dirty air filters
– High ambient temperature
– Poor or no primary water (chiller) flow
– Stuck or plugged solenoid (regulator) valve
– Faulty temperature sensor
– Faulty Main PCB
11 Low Temperature of Coolant OFF ON
The secondary cooling water temperature is < 77ºF (25ºC).
Verify temperature with a thermometer. Allow at least 30
minutes for laser to warm up before troubleshooting. Possible
causes:
– Low ambient temperature
– Primary cooling water lines connected in reverse
– Solenoid valve incorrectly adjusted or faulty
– Faulty heat exchanger
– Improperly adjusted regulator
12 Low Flow Rate of Coolant OFF ON
Flow rate of the secondary cooling water is low. Possible
causes:
– Clogged Ion exchange filter or water filter
– Broken flashlamp (causing blockage in oscillator)
– Bad Flow Sensor
– Bad water pump
– Faulty Main PCB
13
Deionize Trouble
(****M/cm)
OFF ON
The Resistivity of the secondary cooling water is < 2M.
Allow laser to run and verify resistivity increases over time.
Possible causes:
– Old Ion Exchange Resin
– Contaminated water
– Short circuit or leakage across sensor probes
– Faulty Main PCB
14 Simmer Trouble OFF ON
Flashlamp will not simmer (stay on). Possible causes:
– Faulty flashlamp
– Low AC voltage (change Transformer taps)
– Resistivity of secondary cooling water is low
– Faulty Trigger or Simmer PCB
15 Charge Trouble OFF ON
The Capacitor Bank is not charging in the allotted time or the
charge voltage is too high. Possible causes:
– AC voltage out of spec (change Transformer taps)
– Blown fuse in Charge Unit (due to faulty component)
– Faulty Charge Unit or Capacitor Bank.
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