CHAPTER 5: MAINTENANCE
LW500A/LW600A PULSED Nd:YAG LASER
990-539 5-3
Code LCD Screen HV Alarm Corrective Actions
01 Power Supply Cover Opened OFF ON
A side, rear or front panel is removed. Check to be sure all
laser panels are installed. If panels are removed, verify
Interlock switches are bypassed. Possible causes:
– Laser cover is loose or removed.
– Faulty Interlock Switch.
– Faulty Interlock PCB, power supply, or CPU.
02 Head Cover Opened OFF ON
The head cover or flashlamp access cover is removed. Check
to be sure all panels are installed. If panels are removed, verify
Interlock switches are bypassed. Possible causes:
– Laser cover is loose or removed.
– Faulty Interlock Switch.
– Faulty Interlock PCB, power supply, or CPU.
03
Emergency Stop
(220VAC models only)
OFF ON
An Emergency Stop signal is present. Check condition of both
Emergency Stop switches on the Control Panel and the E-Stop
input on the Interface panel. (EXT I/O (3) and EXT I/O (4) ).
04 Coolant Low Level OFF ON
The quantity of secondary cooling water is low. Add Steam-
distilled water to the water tank (to the level indicated on the
water level label). If the problem persists, look for leaks.
Possible causes:
– The water level is too low
– Leak in cooling system
– Faulty water level sensor
– Faulty heat Exchanger
– Faulty Interlock PCB.
05 Phase trouble OFF ON
The phase order of the input AC is incorrect. If this error
occurs, check the A.C. service for proper phasing (X, Y, Z, or
R, S, T) and exchange two of the phases. Possible causes:
– Incorrect A.C. power installation
– Faulty phase detection circuit.
06 Overheat of Pump OFF ON
The temperature of the water pump is excessive. Measure the
A.C. line voltage and verify the laser is set to run at this input
voltage. Possible causes:
– Laser not correctly tapped for the A.C. supply voltage.
– Faulty pump (usually accompanied with noise)
– Faulty temperature sensor
07 DSP Unit Missing OFF ON
The Laser Controller (Program Box) is not connected to the
Laser. This error appears when the Main PCB cannot
communicate with the Laser Controller. Verify connection.
Possible causes:
– Faulty Laser Controller (bad communication driver)
– Faulty Main CPU (bad communication driver)
08
Discharge Resistor
Temperature
OFF ON
The temperature of the Discharge Resistor is high. Turn the
Laser off for 10 minutes and allow the heat in the discharge
resistor to dissipate. Possible causes:
– The High Voltage is cycled on and off too frequently.
– Faulty thermal switch.
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