Welcome to · Quartz Construction Fig. 1 and 1.1 Shows a typical quartz tuning fork used for quartz...
Transcript of Welcome to · Quartz Construction Fig. 1 and 1.1 Shows a typical quartz tuning fork used for quartz...
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Welcome to
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Welcome to the presentation
Quartz Watch Knowledge for Professionals
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Contents
Components in detail
- Batteries
- Quartz
- IC / rate adjustment systems
- Control of the stepping motor (asservissement)
Systematic trouble shooting
Calculation of the battery service life
Service philosophy – Quartz & Mechanical Watches
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Batteries Construction (Cutaway view of a silver oxide cell Zn/Ag2O)
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1: Can
2: Cathode (AG20)
3: Support ring
4: Separator
5: Gasket
6: Electrolyte (NaOH /Sodium or KOH / Potassium)
7: Anode material (Zn)
8: Cap
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Batteries Capacity dependence on temperature
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Example:
175 mAh Capacity
for type 357
Typical temperature
effect on miniature
silver oxide batteries
125%
100%
75%
50%
25%
0%
-20°C -10°C 0°C +10°C +20°C +30°C
-4°F 14°F 32°F 50°F 68°F 86°F
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Batteries Typical self discharge rate at different storage temperatures
Nominal Capacity in mAh (100%)
(Silver oxide / Zn Ag2O system)
~ minus 7-8% after 10 years
at 0°C / 32°F
~ minus 15% after 7 years
at 20°C / 68°F
~ minus 30% after 4 years
at 40°C / 104°F
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100%
90%
80%
70%
60%
0 2 4 6 8 10
Age ( Years)
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Batteries
Difference between High Drain and Low Drain Batteries
Efficiency (Voltage drop) of typical
Low Drain battery with
NaOH (Sodium) Electrolyte
vs (equivalent size / 357)
High Drain battery with
KOH (Potassium) Electrolyte
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% o
f ra
ted c
apacity 100
80
60
40
20
0
Current 1µA 10µA 100µA 1mA 10mA 100mA
Continuous Drain (Battery 357)
NaOH KOH
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Batteries Calculation of battery life under different user conditions:
Example: Quartz Alarm Chrono / Battery type: 1.55 Volt 55mAh
Function Current
consumption
Usage time
per day
Current
consumption per
day
Total current
consumption
per day
Stepping motor 1.5µA 24 h 36µAh
36µAh Chrono Not needed
Alarm Not needed
Battery Capacity: 55 mAh = 55000µAh : 36µAh = Service life of: 1527 days or 50 months
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Batteries Calculation of battery life under different user conditions:
Example: Quartz Alarm Chrono / Battery type: 1.55 Volt 55mAh
Function Current
consumption
Usage time
per day
Current
consumption per
day
Total current
consumption
per day
Stepping motor 1.5µA 24 h 36µAh
60µAh Chrono 8 µA 3 h 24µAh
Alarm Not needed
Battery Capacity: 55 mAh = 55000µAh : 60µAh = Service Life of: 916 days or 30 months
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Batteries Calculation of battery life under different user conditions:
Example: Quartz Alarm Chrono / Battery type: 1.55 Volt 55mAh
Function Current
consumption
Usage time per
day
Current
consumption per
day
Total current
consumption per
day
Stepping motor 1.5µA 24 h 36µAh
66.6µAh Chrono 8 µA 3 h 24µAh
Alarm 1200µA
20 seconds
=0.0055 h
6.6µAh
Battery Capacity: 55 mAh = 55000µAh : 66.6µAh = Service Life of: 826 days or 27 months
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Quartz
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Quartz Construction
Fig. 1 and 1.1
Shows a typical quartz tuning fork
used for quartz watches on the
base of its container.
Its two branches are animated by
an anti-parallel oscillatory
movement (flexion) in the plane of
the tuning fork.
Fig. 1.2
Represents a section of the
branches of the tuning fork, shows
how the electrodes are connected,
as well as the electric fields which
are formed inside the crystal.
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Quartz Technical features
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Dependency
Frequency / Temperature Formula:
F = 0.038 ppm ( T-To) 2 +/- 10%
Fo °C2
1 ppm = 86400 sec/ day = 0.0864 sec./day
1‘000‘000
Calculation Example:
Temperature difference to the Inverse point
= 10°C/ 18°F
0.038 ppm x 0.0864 s/d x 10°C/2 (100°C)
= - 0.32 s/d
Inverse point
5°C 15 °C 25°C 35°C 45°C
41°F 59 °F 77°F 95°F 113°F
0.00 s/d
-0.32 s/d
-0.73 s/d
-1.00 s/d
-1.32 s/d
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Quartz Conclusion / Adjustment
At room temperature, the rate accuracy
on movements with trimmer systems
should be adjusted on a level of
+ 0.10 to +0.20 seconds / day.
Never on 0.00 seconds per day
or less (minus values).
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5°C 15 °C 25°C 35°C 45°C
41°F 59 °F 77°F 95°F 113°F
+0.20 s/d
+0.10 s/d
0.00 s/d
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IC and Stepping motor
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IC Rate adjustment systems
Adjustable quartz
oscillator frequency
by trimmer
(out dated)
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EE
PR
OM
or /O
TP
Adjustable quartz
oscillator frequency
by fix cap
(e.g. Used for stop
watches)
Rate adjustment by
programmable inhibition
system
- EEPROM (reprogrammable)
- OTP (one time programmable)
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IC Rate adjustment systems
Rate is adjustable by
service center
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EE
PR
OM
or /O
TP
Adjustment in the production
process
Trimmer system Fix cap system
Inhibition system (digital)
Adjustment in the production
process
Same test result with signal
capture over quartz frequency
or over motor pulses.
Same test result with signal
capture over quartz frequency
or over motor pulses.
After Inhibition time (10/ 60/120s)
Different test result with signal
capture over quartz frequency or
over motor pulses.
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IC Motor-Management systems (Asservissement)
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IC without asservissement.
Motor pulse not chopped and
with constant pulse width – it is
not suitable for lower current
consumption.
Mainly used in low cost calibers.
IC Type with asservissement.
Chopped motor pulses with two-
way control between rotor and IC.
Power management to reduce the
energy for moving the hands and
to extend the battery life.
Mainly used in sophisticated
movements.
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IC Motor- Management function (Asservissement)
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Motor pulse
Detection
Correction
Next pulse
4- 12 ms / 20-30ms / 30-35 ms / 1 second
Timing
56.25% Chopping level
62.50%
68.75%
75.00%
81.25%
100%
Time: 4 – 12 milliseconds ( ms )
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Data sheet (Philips). Typical watch IC with
adaptive motor pulses (asservissement).
IC with adaptive motor pulses
(Asservissement)
Function mode of the motor drive stages.
Symbolically drawn motor pulses ( + / - )
Typical motor pulse shape Detection phase
(- Voltage)
Constant pulse width (example 7.8ms)
Stage 1 = Lowest stage: 56.25% of 7.8ms = 4.38 ms
Stage 2 = 62.50 % of 7.8 ms = 4.87 ms
Stage 6 = 100 % of 7.8 ms
IC - Motor-Management
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The return of the rotor to the initial position
(-Voltage) will be detected by the IC as
„successful executed step“.
Coil
Stator
Rotor
IC - Motor-Management How does it work?
O.K. Next Step
EEPROM
or /OTP
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Systematic troubleshooting| Quartz Watches
Select Battery test in main menu.
Caution:
Always check the movement for
corrosion and the insulation of the
battery case!
Situation: Watch is not running
Test of the coil resistance and of the
insulation values:
Select Resistance (coil) test in main menu.
Values ok
Test of the coil resistance
coil and movement insulation, without
external power supply and without
battery
Values not ok
Battery not ok
Battery ok
Remove and test the battery
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Systematic troubleshooting | Quartz Watches
Test of the coil resistance and of the
insulation values:
Select Resistance (coil) test in main menu.
Re
pla
ce
th
e e
lectr
on
ic
mo
du
le
Functional test of quartz and IC
Select Rate and consumption test in main
menu.
SIGNAL: Auto (Cons)
TIME: Auto
VOLT: 1.55V-3.00V
- Winding stem - POS: Reset Values ok
Test of quartz and IC
Place the watch on the mirror
support and connect both battery
connectors to + supply - with the
movable contact probes.
Values not ok
Values not ok Values ok
Test of the coil resistance
coil and movement insulation,
without external power supply
and without battery.
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Systematic troubleshooting| Quartz Watches
Test of the stepping motor:
- Winding stem - POS: Neutral
SIGNAL: Auto (Cons)
TIME: 4 s
VOLT 1.55V - 3.00V
Test of the stepping motor
Place the watch on the mirror support and
connect both battery connectors to + supply -
with the movable contact probes.
Test of the lower starting voltage
Place the watch on the mirror support and
connect both battery connectors to + supply -
with the movable contact probes and the
negative test probe with RT/T
Set voltage to 1.55V / 3.00V. Decrease slowly
the voltage until hand stops moving.
Value
not ok
Value ok
- Replace battery
- Close watch
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Systematic troubleshooting| Quartz Watches
Important visual check
Check if:
- steel particles block the rotor or the gear train
- particles between crown and case block the reset
mechanism
- hands touch the inside face of the glass
- hands have no axial freedom
- whether the calendar mechanism functions correctly
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Service philosophy for quartz watches
What is the difference between the service quality for
Mechanical Watches and for Quartz Watches?
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Mechanical Watch in
upper price scale
Jewelry quartz Watch in
upper price scale
The difference is nothing!
Equivalent to the requested service quality from the customer.
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Thank you for your attention
07/10
UH