Casio PRT-40C Istruzioni operative
WATCH BASIC
REPAIR MANUAL
(RANKS A AND B)
JULY 1997
PRT-40C
(QW-1470) MWA-800G
(QW-1325)
R
ABX-68B
(QW-1359)
CONTENTS
FLOW CHART FOR REPAIR OF MODULE WITHOUT MOVEMENT............................ 1
FLOW CHART FOR REPAIR OF MODULE WITH MOVEMENT ................................... 2
FLOW CHART FOR REPAIR OF CASING PARTS ........................................................ 3
1. Circuit Explanation of Quartz Watches ............................................................... 4
1-1 Circuit Diagram.............................................................................................................. 4
1-2 Digital Quartz Watches ..................................................................................................5
1-3 Analog Watches............................................................................................................. 5
2. Measurement of Current Consumption (Oscillation Check) ............................. 6
3. Quality Evaluation and Replacement of Electronic Parts.................................. 8
3-1 Capacitors/Chip .............................................................................................................8
3-2 Transistors ..................................................................................................................... 9
3-3 Coils............................................................................................................................... 9
3-4 Oscillators/Quartz ..........................................................................................................9
4. Accuracy Setting Method for Casio Watches ................................................... 10
4-1 Accuracy Setting by Capacitor/Trimmer ...................................................................... 10
4-2 Accuracy Setting by Pad Selection .............................................................................. 11
4-3 Digital Tuning (Pattern Cutting) Method ...................................................................... 11
5. LCD Replacement................................................................................................ 12
Definition of Ranks B:
<Digital>
Ranks B refers to the level at which technical skills and tools are possessed that enable
evaluation of the quality of all parts at the individual part level, replace or adjust those parts
and perform waterproof inspections, excluding watches equipped with a sensor and the
Professional Diver’s Watches.
<Analog>
Ranks B refers to the level at which technical skills and tools are possessed that enable
evaluation of the quality of all parts at the individual part level, replace or adjust those parts
and perform waterproof inspections, excluding the train wheel unit.
Definition of Ranks A:
Ranks A refers to the level at which technical skills and tools are possessed that enable
evaluation of the quality of all parts of all watches at the individual part level, replace or adjust
thoseparts andperform waterproofinspections, excludingthe ProfessionalDiver’s Watches.
BASIC REPAIR MANUAL
(Ranks A and B)
6. Quality Evaluation and Replacement of EL....................................................... 12
7. Names of Casing Parts ....................................................................................... 14
7-1 G-Shock....................................................................................................................... 14
7-2 Baby-G......................................................................................................................... 15
7-3 Twincept....................................................................................................................... 16
7-4 Data Bank.................................................................................................................... 17
7-5 Diver's Watch...............................................................................................................18
7-6 Watches Equipped with a Sensor/Pressure (Side Sensor) ......................................... 19
7-7 Watches Equipped with a Sensor/Pressure (Front Sensor) ........................................ 20
8. Replacement of Casing Parts ............................................................................. 21
8-1 Glass Replacement ..................................................................................................... 21
8-2 Button Replacement .................................................................................................... 22
8-3 Register Ring Replacement......................................................................................... 23
8-4 Piezo Replacement ..................................................................................................... 23
9. Analog Block Replacement ................................................................................ 24
10. Waterproof Inspection......................................................................................... 26
10-1 Water Resistant Tester .............................................................................................. 27
10-2 Air Leak Checker ....................................................................................................... 28
10-3 Water Pressure Tester and Hot Plate ........................................................................ 30
11. Quality Evaluation and Replacement of Sensor/Pressure .............................. 32
11-1 Trouble Shooting with Sensor/Pressure Trimming Jig Set......................................... 33
11-2 Trouble Shooting without Sensor/Pressure Trimming Jig Set.................................... 34
11-3 Sensor/Pressure Quality Evaluation .......................................................................... 35
11-4 Removal and Attachment of Sensor/Pressure ........................................................... 35
11-4-1 Sensor/Pressure Equipped on Side of the Watch .................................................. 35
11-4-2 Sensor/Pressure Equipped on Front of the Watch ................................................. 36
12. Altimeter of Watches Equipped with a Sensor/Pressure ................................. 36
13. Quality Evaluation and Replacement of Sensor/Magnetic .............................. 37
13-1 When a Watch Does Not Indicate Directions Correctly ............................................. 37
13-2 Quality Evaluation of Sensors/Magnetic .................................................................... 37
13-3 Quality Evaluation of Sensors/Magnetic .................................................................... 38
14. Quality Evaluation and Replacement of Coil Ass'y .......................................... 38
15. Repair of Module/with movement ...................................................................... 39
15-1 Precautions when Repairing Modules/with movement.............................................. 39
15-2 The Structure and Names of Parts of Module/with movement .................................. 40
15-3 Explanation of Each Part of Module/with movement ................................................. 42
15-3-1 Train Wheel Part..................................................................................................... 42
15-3-2 Correction Part ....................................................................................................... 42
15-3-3 Calendar Part .........................................................................................................43
15-4 Disassembly, Cleaning, Lubrication and Reassembly of Module/with movement ..... 44
15-4-1 Disassembling ........................................................................................................ 44
15-4-2 Cleaning .................................................................................................................44
15-4-3 Lubrication and Reassembly .................................................................................. 45
15-4-4 Confirmation ........................................................................................................... 46
16. Clock Repair (Heat Seal Replacement).............................................................. 46
— 1 —
FLOW CHART FOR REPAIR OF MODULE WITHOUT MOVEMENT
(RANKS A AND B)
Module without
Movement is broken
What is wrong ?
LCD is broken ?
Battery have
much power
Current
consumption is
OK ?
Sensor/pressure ?
Sensor/magnetic ?
EL doesn’t light
Refer to 6. Quality
evaluation and
replacement of EL
Refer to 5. LCD
replacement
Sensor trouble
Display trouble
Replacement of PCB ass’y
or replacement of
each components. (Refer to
3. Quality evaluation and
replacement of electronic parts.)
Water resistant inspection
(In case the watch is water resistant)
Refer to 10. Waterproof inspection.
Repair is finished
Refer to Watch
Basic Repair
Manual (Ranks
C and D)
Refer to 11. Quality
evaluation and
replacement of
sensor/pressure
Refer to 13. Quality
evaluation and
replacement of
sensor/magnetic
Refer to
2. Measurement of
current consumption
(Oscillation check)
Sensor/pressure
Sensor/magnetic
Yes
No
No
Good
Yes
Yes
No good
— 2 —
FLOW CHART FOR REPAIR OF MODULE WITH MOVEMENT
(RANKS A AND B)
Module with
Movement is broken
What is wrong ?
Battery have
much power
Current
consumption is
OK ?
Sensor/pressure ?
Sensor/magnetic ?
EL doesn’t light
Refer to 6. Quality
evaluation and
replacement of EL
Refer to Watch
Basic Repair
Manual (Ranks
C and D)
Sensor trouble
Hands are not
moving
Replacement of PCB ass’y
or replacement of
each components. (Refer to
3. Quality evaluation and
replacement of electronic parts.)
Repair of mechanical portion.
Refer to 9. Analog blcok
replacement, 14. Quality evaluation
and replacement of coil ass'y and
15. Repair of module/with movement.
Water resistant inspection
(In case the watch is water resistant)
Refer to 10. Waterproof inspection.
Repair is finished
Refer to 11. Quality
evaluation and
replacement of
sensor/pressure
Refer to 13. Quality
evaluation and
replacement of
sensor/magnetic
Refer to
2. Measurement of
current consumption
(Oscillation check)
Sensor/pressure
Sensor/magnetic
Yes
Yes
Good
No
No good
— 3 —
FLOW CHART FOR REPAIR OF CASING PARTS
(RANKS A AND B)
The casing parts of watch
is broken
What is wrong ?
Which part is
broken
Yes
Band or Dial are
broken
Glass is broken Button is broken Register ring is
broken Case is broken
Alarm doesn't
sound
Refer to 8-4. Piezo
replacement
Refer to Watch
Basic Repair Manual
(Ranks C and D)
Refer to 8-1. Glass
replacement Refer to 8-2. Button
replacement Refer to 8-3. Register
ring replacement
Refer to Watch Basic
Repair Manual
(Ranks C and D)
Water resistant inspection
(In case the watch is water resistant)
Refer to 10. Waterproof inspection.
Case/Center ass'y is
broken
Repair is finished
— 4 —
1. Circuit Explanation of Quartz Watches
The basic circuits employed in quartz watches are as described below. Nearly all portions of these
circuits are contained in the LSI, and therefore cannot be repaired. (Fig. 1-1) However, they are
important in terms of understanding the operating principle of the quartz watches.
1-1 Circuit Diagram
Fig. 1-1
— 5 —
1-2 Digital Quartz Watches
Power Unit (Battery):
There are two types of batteries: a battery/lithium (3.0 V, mainly used in digital watches), and a battery/
silver oxide (1,55V, mainly used in analog watches). In addition, since the driving voltage of the LCD
driver is 3 V and that of the oscillator is 1.5 V, a voltage halver (for the oscillator) is provided in the LSI
of the modules using a battery/lithium, while a voltage doubler (for driving the LCD) is provided in the
LSI of the modules using a battery/silver oxide.
Oscillator:
This circuit generates a 32,768 Hz signal with the oscillator/quartz and capacitor/trimmer.
Frequency divider:
This circuit converts the 32,768 Hz signals produced with the oscillation circuit to 1 Hz signals with
Count Down Flip Flop.
Counter (memory):
This circuit controls the counting of time, calendar and stopwatch functions, etc. based on the 1 Hz
signals produced by the dividing circuit.
Driver:
This circuit drives the LCD, alarm, EL and so forth.
1-3 Analog Watches
Oscillator and Frequency divider:
These circuits function in the same manner as in digital watches.
Coil driver:
This circuit provides a 1 Hz alternating current (signal) to the coil of the analog block.
DIGITAL QUARTZ WATCH
Fig. 1-2
— 6 —
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.
2. Measurement of Current Consumption (Oscillation Check)
Tool used
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).
ANALOG QUARTZ WATCH
NO. Code No. Tool name
1 1904 5153 HP-fingerstall
2 1902 0974 Battry checker
3 1904 5277 Multimeter
4 1901 9523 Precision tweezers
5 Lead wire
6 Alligator clip
7 IC clip
Fig. 1-3
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