24 • LMH Series Rotary Lasers
9. TROUBLESHOOTING
The following information lists basic tests that can be performed to
check the LMH in the event of poor performance.
Check Your Batteries: One of the most common causes of perfor-
mance failures is due to defective or incorrectly installed batteries.
Check to see if any batteries are installed backwards and correct
if necessary.
• Never selectively replace batteries; always replace all of the batteries
at the same time with new batteries. It is recommended, if possible,
that the batteries be checked with a voltmeter or battery tester to
confi rm proper voltage.
• Leaky batteries may have damaged the battery contacts in the
battery box.
• Check to see that the battery tray is screwed tightly onto the base of
the unit. Also, the fi t between the battery prongs and the batteries
may need adjustment, as this fi t may vary over different brands of
battery (especially Energizer™ brand, as they are larger in diameter,
preventing a proper connection).
• Alkaline batteries are recommended for the best performance and
storage life. Rechargeable batteries such as Nickel-Cadmium will
provide performance, but are not as desirable due to their lower
terminal voltage. Low cost standard Carbon-Zinc batteries may be
used in emergencies, but they should be replaced with alkaline
batteries when available.
Rechargeable Battery Pack: For maximum battery life, the battery
pack must contain a full charge. The batteries will begin to perform
optimally after fi ve full charges and discharges.
Unit does not rotate or self-level, or produces Axis Drive Er-
ror: Reset the internal processor by turning power off and on again.
You may also try removing the battery tray for 15 seconds to let the
capacitor discharge, then replace the tray and try again.
If the unit rotates but does not self-level, be sure that the Anti-Drift
System is turned off.
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