Measurement Of Current Consumption (Oscillation Check) - Casio PRT-40C Repair Manual

Stepping Motor:
This is composed of a coil, stator and rotor. This motor turns the rotor 180 degrees per second when
the 1 Hz alternating current signal is received from the coil driver, resulting in rotation of the gears of
the train wheel unit. Operation beyond this point is performed by the mechanical portion.
Mechanical block:
This unit moves the hands and calendar wheel as a result of its gears being turned by the motive force
from the rotor.
ANALOG QUARTZ WATCH

2. Measurement of Current Consumption (Oscillation Check)

Tool used
NO. Code No.
1 1904 5153 HP-fingerstall
2 1902 0974 Battry checker
3 1904 5277 Multimeter
4 1901 9523 Precision tweezers
5
6
7
In cases when the battery life of a watch appears to be extremely short, it is possible that current
consumption has increased abnormally due to circuit shorts, defective parts or other problems.
When this happens, the quality of the module can be evaluated by measuring current consumption.
In addition, in the case of analog watches, it is possible to determine whether the location of the
malfunction is in the electronic portion or mechanical portion of the watch by measuring current con-
sumption (oscillation check).
Fig. 1-3
Tool name
Lead wire
Alligator clip
IC clip
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