PARTS LIST /TECHNICAL GUIDE

Analogue Solar Cal. V115A

[SPECIFICATIONS]
Cal. No.
Item V115A

• Diameter
Outside: Ø 15.55 mm x 11.80 mm
• 2 hands (hour, minute hands) Casing: Ø 15.15 mm x 11.80 mm
• Height: Ø 2.09 mm

Interval of hands movements Two hands (move at 20-second intervals)

Driving system Stepping motor (Load compensated driving pulse type)

Additional function • Electronic circuit reset function

• Overcharge prevention function

Normal position Free

Crown operation
1st click position Time setting, hand position adjustment/resetting the circuit

Monthly rate: Less than 15 seconds (worn on the wrist at the

Loss/Gain temperature between -5 ºC and 35 ºC)

Regulation system Nil

Gate time for rate measurement Use 10-second gate.

Current consumption Movement: Less than 0.22 μA

Circuit block: Less than 0.16 μA

Coil resistance 4002 909: 1.70 – 2.60 KΩ

Power
generator Solar power system
Rechargeable MT516F
Power supply battery
Operating
voltage range 1.2 V - 2.2 V

Battery life Approx. 12 months (from full charge)

Number of jewels 0 jewel

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 SPECIFICATIONS Cal. V115A

Cal.V115A is ladie's 2 hands analogue watch employing a new solar panel (3 cell unit), but the
basic movement structure of Cal.V115A is smilar to the previous Cal.V11 Series watches, and the
knowledge and technique you have gained in handling the previous Cal.V11 Series watches will
come in handy when you repair Cal.V115A.

FEATURES

Cal. V115A

This is the ladies' analogue watch powered by light energy. The battery used in this watch
is a rechargeable battery, which is different from ordinary silver oxide batteries. Unlike other
disposable batteries such as dry-cell batteries or button cells, this rechargeable battery can be
used over and over again by repeating the cycles of discharging and recharging.

The capacity or recharging efficiency of the rechargeable battery may gradually deteriorate for
various reasons such as long-term use or usage conditions. Worn or contaminated mechanical
parts or degraded oils may also shorten recharging cycles. If the efficiency of the rechargeable
battery decreases, it is necessary to have the watch repaired.

l Guideline of charging time

Environment/ Time required for Time required for Time to charge 1

Illumination (lux) full charge steady operation day of power
Light source

Office, overhead/
Fluorescent light 700 - 60 hours 180 minutes

30W 20 cm/ 3,000 180 hours 10 hours 35 minutes

Fluorescent light

30W 3 cm/
Fluorescent light 10,000 60 hours 4 hours 12 minutes

Cloudy weather/
10,000 60 hours 4 hours 12 minutes
Sunlight

Fine weather/
100,000 10 hours 0.5 hours 2 minute
Sunlight

The above table provides only a general guideline.

It is recommended that the watch be charged for as long as the charging time according to the
column "Time required for steady operation" in this table in order to assure the stable movement
of the watch.

l Caution for charging

When charging the watch, do not place it too close to a photo flash light, spotlight, incandescent
light or other light sources as the watch temperature will become extremely high, causing
damage to the parts inside the watch.
When exposing the watch to sunlight to charge it, do not leave it on the dashboard of a car, etc.
for a long time, as the watch temperature becomes extremely high. While charging the watch,
make sure the watch temperature does not exceed 60 ºC.

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 Cal. V115A
PARTS LIST
Disassembling procedures Figs. : 1 27

Reassembling procedures Figs. : 27 1

Lubricating : Types of lubricant

Watch Oil AO-3
Watch Oil AO-2
Lubricant quantity:
Normal quantity

[SOLAR POWER GENERATION MECHANISM]

1 Hour and minute hands

2 Dial

3 8700 ***
Dial sheet
4 0866***
Holding ring for dial

5 4025 547
Solar cell

6 4246 644
Solar cell lead terminal
Movement

7 0491 735
Dial washer

8 0271 946
Hour wheel

0022 221
• Circuit block cover screw (2 pcs.)
• Train wheel bridge screw (1 pc.)

• Please see the remarks on the following pages.

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 Cal. V115A
PARTS LIST
[BATTERY AND ELECTRONC CIRCUIT - GEAR TRAIN MECHANISM AND STEPPING
MOTOR SETTING MECHANISM]]

9 0022 221
Circuit block cover screw

10 4461 534
Circuit block cover

11 4000 657
Circuit block

12 3027 26T
Rechargeable battery unit

13 0022 221
Train wheel bridge screw

14 0125 908
Train wheel bridge

15 4002 909
Coil block

16 0231 811
Third wheel and pinion
17 4146 557
Step rotor

18 0221 967
Center wheel and pinion

19 0281 806
Setting wheel

20 0384 806
Yoke

21 0261 808
Minute wheel

22 0389 909
Setting lever spring

23 0383 806
Setting lever

24 Setting stem

25 0282 804
Clutch wheel

26 4239 909
Rotor stator

27 0100 969
Main plate

• Please see the remarks on the following pages.

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 Cal. V115A
PARTS LIST
● How to find the correct parts, if not determined by the 4-digit caliber number

Following parts are determined based on the design of watches, such as hands height, dial
color, and design of cases. Please refer to the SEIKO WATCH PARTS CATALOGUE in order to
choose corresponding parts.

3 DIAL SHEET (8700 ***)

The type of DIAL SHEET is determined based on the design of cases and some models do
not need it. Check the case nuumber and refer to the “Parts Catalogue web site” to choose a
corresponding DIAL SHEET.
4 HOLDING RING FOR DIAL (0866 ***)

24 SETTING STEM (0351 ***)

The type of setting stem is determined based on the design of cases. Check the case number
and refer to the "Parts Catalogue web site" to choose a corresponding setting stem.

● Tools and consumables required for disassembling/reassembling

• Movement holder
UNIVERSAL MOVEMENT HOLDER
(S-682)

• Watch oils
SEIKO watch oils (AO-3 and AO-2)

AO-3 AO-2

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 Cal. V115A
TECHNICAL GUIDE
REMARKS ON DISASSEMBLING AND REASSEMBLING THE MOVEMENT

● How to remove the SETTING STEM before dismantling the movement

Crown position: Normal position

Push the SETTING LEVER gently (refer to the Fig. 1) in order to disengage it from the SETTING
STEM. Then pull out the crown with the stem completely.

Fig. 1

● Solar power generation mechanism - positions of the hooks

2 DIAL
Guide portions
• How to install
Set the 4 notched portions of the DIAL
into the guide protrusions of the HOLDING
RING FOR DIAL. Guide portions

Guide portions
Guide portions
3 DIAL SHEET (8700 ***)
• How to install Guide portions
Guide portions
Set the 4 notched portions of the DIAL
SHEET into the Guide protrusions of the
HOLDING RING FOR DIAL.
* Some models do not need the DIAL
SHEET.
* As one side of the DIAL SHEET reflects
lights, the reflecting side is the side on
which to set the dial.

Guide portions Guide portions

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 Cal. V115A
TECHNICAL GUIDE

4 HOLDING RING FOR DIAL (0866 ***)

5 SOLAR CELL (4025 547)
The above 2 parts can be disassembled and re-assembled without
separating the parts.
Please refer to “How to separate the DIAL HOLDING RING and
SOLAR CELL.”.
Hooks Hooks
• How to remove
Release the pointed 4 hooking portioins
as shown in the right image from the main
plate with tweezers.

Guide pin

• How to install

Set the 2 guide pins to the DIAL and push

the 4 hooking portions. Make sure they
are properly set and hooked to the DIAL.

● How to separate and set the DIAL HOLDING RING and SOLAR CELL
• How to separate
Remove the 2 hooks of the DIAL HOLDING RING gently
as the SOLAR CELL is easily scratched.

Hooks

• How to set

Set the 2 hooks of the DIAL HOLDING RING gently onto

the SOLAR CELL.

Separate image

REMARKS:
* Be careful not to damage or scratch the SOLAR CELL as the generating performance could be declined
significantly with a scratch or damage.
* In case the performance of the SOLAR CELL does not satisfy the standard which is mentioned after checking
page 13 “Output of voltage for the solar cell unit.” please replace the SOLAR CELL with a new one.
* In case a SOLAR CELL has become dirty, wipe the dirt of with an alcohol soaked chamois cloth so you
do not to damage it.

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 Cal. V115A
TECHNICAL GUIDE
● Rechargeable battery and electronic circuit

12 Rechargeable battery unit

• How to install Rechargeable battery unit

Set the “B” portion of the (-) lead terminal

of the rechargeable battery unit to the
groove of the main plate, and then, set the
“A” portion of the (-) lead terminal to the
guide post of the main plate.
Guide
post
Notes:
* Handle the rechargeable battery unit with care
so as not to short-circuit its (+) and (-) terminals.
Otherwise, the rechargeable battery unit will “A” portion of
be deteriorated. the (-) lead terminal

* Never wash the rechargeable battery unit as

it is an electronic part. “B” portion of
the (-) lead terminal

10 Circuit block cover

• How to remove
Remove the two circuit block cover screws,
and then, release the two hooking portions
marked with the arrows in the illustration at
right from the main plate.

• How to install
Set the circuit block cover so that the two
hooking portions marked with the arrows in
the illustration at right catch the main plate
securely, and then, tighten the circuit block
cover screws.

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 Cal. V115A
TECHNICAL GUIDE
● Gear train mechanism - Wheel assmbly position and lubrication instructions

16 Third wheel and pinion

Lubriccating: Types of lubricant
17 Step rotor
Watch oil AO-3
18 Center wheel and pinion
19 Setting wheel Watchi oil AO-2

21 Minute wheel Lubricang quantity:

Normal quantity

• Setting position and lubricating

Refer to the illustrations below for the setting position and lubrication of the
respective wheels.

qj Step rotor wa Minute wheel

qk Center wheel
and pinion
qh Third wheel wa Minute wheel
qj Step rotor and pinion
ql Setting wheel

ql Setting wheel

qh Third wheel and pinion

qk Center wheel and pinion

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 Cal. V115A
TECHNICAL GUIDE
● Setting mechanism - Assembly position and lubrication instructions

20 Yoke
22 Setting lever spring
23 Setting lever

• Setting position and lubricating

Refer to the illustration below for the setting position and lubrication of the respective parts.

“A” portion Spring portion of the yoke

• Have the spring portion of the yoke securely

catch the protruded portion of the main plate
w; Yoke
("A" portion in the illustration).

Note: Take care not to install the setting lever

spring upside down. (Refer to the
illustration at right.)

Minute wheel

wd Setting lever ws Setting lever spring

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 Cal. V115A
TECHNICAL GUIDE
REMARKS ON INSPECTION AND MEASUREMENT
● Value checking - coil resistance (coil blocks)

COIL BLOCK 4002 909 1.70KΩ - 2.60KΩ

● Current consumption

For the whole movement : Less than 0.22 μA (with voltage supplied from a battery)
For the circuit block alone : Less than 0.16 μA (with voltage supplied from a battery)

● How to measure the current consumption for the whole movement

1. Remove the solar cell holder and solar cell.
2. Remove the rechargeable battery unit, and then, reassemble the circuit block, circuit block cover
and two circuit block cover screws.
(As a result, only the rechargeable battery is removed from the movement.)
3. Apply the probes of the tester as shown in the illustration below.
Note: When applying the minus probe of the tester, take care not to short-circuit the minus probe
and circuit block cover.

4. After checking that a stable measurement is obtained with the tester connected, read the current
consumption. (As the hands move at 20-second intervals, 3 to 5 minutes may be required before a
stable measurement is obtained.)

Note: If the measurement value remains high

or unstable, shut out the light from the
movement, and make a measurement
again.

5. Wait until a stable measurement becomes available.

It usually takes 30 seconds to a few minutes for
getting a stable measurement.

6. Make sure that the read value is less than 0.80 μA.

* When measuring the current comsumption using

the SEIKO digital multi-tester (S-860), use the range
of 40 μA of SUPPLY V (=1.55V) & GATE TIME 2S).

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 Cal. V115A
TECHNICAL GUIDE
● How to measure the current consumption for the circuit block alone
1. Apply the probes of the tester as shown in the illustration.
2. Shut out the light from the circuit block.
Note: If the circuit block is exposed to light, an extremely high measurement value may be
obtained.

3. After checking that a stable measurement is obtained with the tester connected, read the current
consumption.

* When measuring the current consumption us-

ing the SEIKO digital multi-tester (S-860), use
the range of 40 μA of SUPPLY V (=1.55V) &
GATE TIME (2S).
* Avoide exposing the CIRCUIT BLOCK to direct
light in order to obtain the correct measure-
ment.

● Structure of the circuit block

Coil output terminal

Crystal unit
C-MOS-IC

Input terminal (-)

Input terminal (+)

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 Cal. V115A
TECHNICAL GUIDE
l Output voltage for the solar cell unit

Output voltage when the watch is placed at a distance of

5 cm under a fluorescent light of 15 to 20 watts : More than 1.8 V

Checking procedure
1. Connect the tester to the output terminal of the solar cell
unit as shown in the illustration at right.

2. With the probes of the tester applied, place the solar cell
unit at a distance of 5 cm under a fluorescent light of 15
to 20 watts, exposing the solar cell side to the light, and
then measure the output voltage.

5 cm

l Checking the recharging function

A conventional method of checking the recharging function is to check the difference of the rechargeable
battery voltage between before and after a recharge.

Checking procedure

1. Apply the probes of the tester as shown in the illustration

at right to measure the voltage of the rechargeable battery
before recharge (initial voltage).

2. Place the watch at a distance of 5 cm under a fluorescent

light of 15 to 20 watts, and charge it for 30 minutes.

Notes:
5 cm
* Use a fluorescent light to charge the watch, as light
sources generating heat may cause damage to the
watch. To charge the watch efficiently, place it under
the center of the fluorescent tube.
* While charging the watch, make sure that the watch
temperature does not exceed 60 ºC.

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 Cal. V115A
TECHNICAL GUIDE
3. After recharging for 30 minutes, apply the probes of
the tester in the same manner as in step "1" above, and
measure the rechargeable battery voltage while keeping
the watch exposed to the light.

5 cm

4. Refer to the table below to determine whether the recharging function is normal or not.

[ Initial voltage and guidelines of normal/defective decision ]

Initial voltage Guidelines of normal/defective decision

The battery is normal if the rechargeable battery voltage obtained

0.5 V - 1.00 V
after recharge is more than 1.2 V.

The battery is normal if the rechargeable battery voltage has in-

1.01 V - 1.2 V
creased more than 0.08 V after recharge.

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 Cal. V115A
TECHNICAL GUIDE
l Checking the general function

Operation Function Checkpoint

Pull out the crown

to the 1st click
Make sure that it has
and push it back Setting mechanism -
a click at the 1st click
in to the normal function of the time
position and the stem
position. Repeat setting
is not pulled off.
the same several
times.

Pull out the crown Setting mechanism -

to the 1st click, hour and minute
then turn it. hand setting
Make sure that the
hour and minute
hands move
smoothly (without
touching each other
or touching the
surface of the dial or
Hands installation inside of the glass).

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 Cal. V115A
TECHNICAL GUIDE
l Checking the water resistance

Check the water resistance according to the designated specification of the watch.

Marking on the case back Test method Applied pressure

WATER RESISTANT (WATER RESIST) Air leak test 3 BAR

WATER RESIST 5BAR 5 BAR

Water pressure test

WATER RESIST 10BAR 10 BAR

WATER RESIST 15BAR 15 BAR

Condensation test

WATER RESIST 20BAR 20 BAR

SCUBA DIVER'S (AIR DIVER'S) 150 m 18.75 BAR = 150 (m) times 0.125
Condensation test

SCUBA DIVER'S (AIR DIVER'S) 200 m 25 BAR = 200 (m) times 0.125

He-GAS DIVER'S 300 m Water pressure test 37.5 BAR = 300 (m) times 0.125

He-GAS DIVER'S 600 m 75 BAR = 600 (m) times 0.125

Condensation test
He-GAS DIVER'S 1000 m 125 BAR = 1000 (m) times 0.125

l Accuracy test

Measure the rate and make sure the value shows within ±0.50 s/d.
Use 10 seconds gate of the tester.

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