Quality Evaluation Of Sensors/Magnetic; Quality Evaluation And Replacement Of Coil Ass'y - Casio PRT-40C Repair Manual

If any of the resistance values are found to be abnormal, the sensor/magnetic, PCB ass'y or module is
replaced with a new one.
No. of pin
No.3 and No.6
No.2 and No.7
No.1 and No.5
No.1 and No.4

13-3 Quality Evaluation of Sensors/Magnetic

In case the sensor/magnetic is replaced, be sure to keep the followings for the handling of the sensor.
1) Be sure to gasp the sensor/magnetic with fingers of wearing the fingerstall, and don't gasp the
sensor with tweezers to prevent the wire from breaking.
2) Be careful direction of the sensor when the
new sensor is installed.
The direction of the sensor must be as
shown right. Be careful for four marks on
each corner of the sensor. Also be careful
for top and bottom of the sensor.
3) Be sure to install the new sensor flatly on
the PCB.
4) In the case of models using a triple sensor
(ATC-1000/ATC-1100/ATC-1200/PRT-40,
etc.), as the sensor/pressure is used, the
sensor/magnetic or module with sensor
must be replaced unless a sensor/pres-
sure trimming jig set is available. (The sen-
sor/magnetic cannot be replaced by the
PCB ass'y.)

14. Quality Evaluation and Replacement of Coil Ass'y

Tool used
NO. Code No.
1 1904 5153 HP-fingerstall (two set)
2 1901 9672 Precision screwdriver set
3 1901 9523 Precision tweezers
4 1904 1647 Anti-mafnetic screw driver set
5 1901 9519 Blower brush
6 1904 5277 Multimeter
When an analog or combination watch has stopped running, a defective PCB ass'y or coil ass'y should
be considered when oscillation is unable to be confirmed by performing an oscillation check (see 2.
Measurement of Current Consumption (Oscillation Check)).
In this case, determining whether the defect lies in the PCB ass'y or the coil ass'y is performed by
measuring the resistance value of the coil ass'y.
Resistance value
800 Ω ± 200 Ω
800 Ω ± 200 Ω
70 Ω ± 14 Ω
85 Ω ± 17 Ω
Tool name
— 38 —
Fig. 13-1
Fig. 13-2