LaserGuard2 Instruction Manual
April 2015
Page 22 of 31
3.9. Troubleshooting
NOTE: Please refer to Table 1 for the Laser Diagnostic LED Functions referred to in this section.
If the green LED on the laser head flashes at 4Hz, the laser has short circuited. Replace the laser unit. Do
not try to service it. Return it to the factory.
If the laser is aligned and the red dot is not visible on the reflector, check for +12V at terminals marked
+12V and GND at TB1 on the range detector module. If 12V is not present, check the power supply in the
laser support unit. If 12V is present, turn the power off and check the continuity of the cable (refer to
Figure 10 through Figure 12). Replace defective sub-assemblies as necessary. If none are found, replace
the laser head.
When the laser head is greater than 150 ft. from its target, or an object is blocking the path of the laser for
more than 10 seconds, the following conditions should exist on the range detector module:
The three LEDs (DS4, DS3, and DS2) (refer to Figure 13) next to each range detector should be lit, and
the red LED (DS6) by the fault detector should be lit. The red FAULT LED (DS5) should be off.
If the red FAULT LED is flashing, check Table 1 to determine the cause.
