Casio ABX-68B, Repair Manual, Page: 11 / 52

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The measurement procedure is described below.
1) Remove the cover/back and take out the battery. (Use a plastic tweezers or finger stall.)
2) After checking that the battery still has sufficient charge with a battery checker, place the battery
on the plate/main of the module with the plus side facing down.
3) After setting the measurement range of the analog multimeter to an alternating current range of 30
or 50
µ
A, place the plus end of the probe (colored red) on the battery (minus side) and place
the minus end (colored black) on the battery contact (–) of the module/with movement. (Fig.
2-1)
4) Although the procedure up to step 3) is satisfactory for analog watches, in the case of digital and
combination watches, the AC operation is performed with the watch left in the state in step 3).
(Fig. 2-2)
In the case of performing this procedure alone, since it is difficult to perform the AC operation with
one hand while holding the two tester probes with the other hand, this can be done easier by using
that which has an alligator clip and IC clip attached to the lead wires. (Fig. 2-3)
5) In the case of digital and combination watches, current consumption can be considered to
be normal if the needle on the multimeter points to between roughly 3 and 10
µ
A. In the
case of analog watches, current consumption can be considered to be normal if the needle
on the multimeter deflects between roughly 0 and 10
µ
A every second.
Current consumption differs according to the module. Refer to the List of Current Consumption for
each module in the Watch Index Book for the proper current consumption value of each model.
6) In the case of analog watches, if the needle deflects normally as described in 5) above, it can be
assumed that 1 Hz signal is reaching the coil ass'y of the stepping motor. Thus, when repairing
an analog watch that has malfunctioned with the hands stopped, first try measuring current
consumption. If current consumption is found to be normal, it means that the cause of the mal-
function lies in the mechanical portion (past the rotor). Conversely, if current consumption is found
to be abnormal, this means that the cause of the malfunction lies in the electronic circuits and coil
ass'y.
Fig. 2-3
Fig. 2-1
Fig. 2-2
Lead wire
Red probe Black probe
IC clip Alligator clip
Black
Red
Black
Red