Explanation Of Each Part Of Module/With Movement; Train Wheel Part; Correction Part - Casio PRT-40C Repair Manual

15-3 Explanation of Each Part of Module/with movement

Modules/with movement can be broadly divided into the train wheel unit, correcting unit and calendar
unit according to their respective functions.

15-3-1 Train Wheel Part

The train wheel unit is composed of the stepping motor (coil ass'y, stator and rotor), wheel/fifth (wheel/
intermediate), wheel/second, wheel/third, wheel/cannon pinion (ass'y), wheel/minute and wheel/hour.
To begin with, the stator connected to the coil ass'y becomes a magnet as a result of a 1 Hz signal
from the coil ass'y.
Since the 1 Hz signal flowing to the coil ass'y at this time is an alternating current, the N and S poles
of the stator rotate in reverse in every second.
A part of the rotor is made of a magnet that is repulsed each time the N and S poles of the stator rotate
in reverse, rotating 180 degree each time in one second.
This rotation is transferred via the wheel/fifth (wheel/intermediate), wheel/second, wheel/third and so
forth, with deceleration occurring after each round of transmission.
This transmission of rotation results in movement of the hands at-
tached to the gear shaft. (Fig. 15-1, Fig. 15-2)
In the train wheel unit, the wheel/minute and wheel/hour on the
dial side sandwiched around the plate/main are referred to as the
minute train side, while the portion on the battery side is referred to
as the train wheel side.
Battery
Oscillator/Quartz

15-3-2 Correction Part

The correction part refers to the part that performs correction of time and date.
It is composed of the lever/setting, jumper/setting lever, lever/stop, lever/reset, wheel/sliding pinion
and wheel/setting. First, when the crown is pulled out, the lever/setting rotates simultaneous to the
crown being pulled out. This causes the end of the lever/stop to make contact with the rotor or wheel/
fifth (wheel/intermediate) causing the hands to stop. At the same time, since the jumper/setting lever
causes the wheel/sliding pinion to slide toward the center of the movement, the wheel/sliding pinion
engages with the wheel/setting making it possible to set the time.
Hand/Second
Stator
Coil ass'y
LSI
Wheel/Second
Fig. 15-2
— 42 —
Fig. 15-1
Hand/Minute
Wheel/Minute
Rotor
Wheel/Cannon pinion
Wheel/Third
Shaft
Pinion
Wheel
Hand/Hour
Wheel/Hour