Humboldt H-4140 GeoGauge - Manual (Page 17)

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8.0: Transit - Carrying Case
The transit case has both key lock and combination lock. The combination is set
at factory “0-0-0”. To re-set the combination number:
1) Open the case. Looking at the back of the lock inside the case you will see a
change lever. Move this change lever from the normal position to the middle
of the lock in the way that it hooks behind the change notch. Move it
sideways and then up.
2) Now you set your combination number by turning the dials to the desired
three number combination. Record the numbers below.
3) Move the change lever back to its normal position.
4) To lock, close the case securely and rotate one or more of the dials.
To un-lock, set the dials to the proper numbers.
5) Record the numbers _______-________-________
6) The key lock/latch set requires the attached key to lock.
9.0: Replacing Batteries
Model H-4140 requires six (6) size “D”, 1.5 volts dry cell alkaline batteries.
Three (3) batteries in each of the two battery compartments, accessible via two
screw-on caps on the top of the GeoGauge. Replace all batteries with a fresh
set. Attempting to mix fresh batteries with used batteries will cause the fresh
batteries to deteriorate very quickly to the level of the used batteries, negating
any advantage of fresh batteries.
1) Turn off gauge. Remove the battery caps by unscrewing counter-clockwise.
A suitable coin may be helpful to loosen them.
2) Carefully lift and remove the spring and the battery contact retainer.
3) Remove the batteries, tilting and turning the gauge upside down will
facilitate removal.
4) Insert the fresh batteries with the positive (+) side up in both compartments.
5) Carefully insert the battery contact retainers and springs and then screw on
clockwise the battery caps. There is an o-ring seal on the underside of the
battery caps to seal out water and dirt. Hand tighten only. Occasionally
during use insure that the battery caps are tight.
6) Loosen the four (4) corner captive screws with a Phillips screwdriver. Remove
any static electricity in one-self by touching a metal earth grounded object
such as the back of a computer housing.
7) Carefully lift up the display panel which contains the electronic circuitry on
the underside. On the left side are two toggle switches, #1 and #2.
8) Switch #1 to on as marked. Turn on the unit by pressing the “ON” button.
The display will momentarily show reset and then revert to its normal display.