Seiko Y911A Quick start guide

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PARTS CATALOGUE /TECHNICAL GUIDE
Cal. Y911A
(x 1.0)
Movement
Item
[SPECIFICATIONS]
Cal. No. Y911A
Outside diameter ø33.0 mm
*The liquid crystal panel unit is installed
after the installation of the dial and hands,
and then the movement can be cased to
complete the reassembly procedures.
Height (including
the liquid crystal
panel unit)
Movement size
6.9 mm
Time indication Analogue section Digital section
3 hands High molecular, dispersion
type liquid crystal display
Driving system Step motor (Load compensated
driving pulse type) 1/2 multiplex driving system
Display system •Time display •Calendar display
•Electronic circuit reset switch
•Train wheel setting device
•Battery life indicator
•Alarm function (regular alarm
and single-time alarm)
•Hourly time signal function
•Stopwatch function
•Lap time/split time memory
recall function
Additional mechanism
Loss/gain Monthly rate at normal temperature range: less than 20 seconds
Regulation system Nil
Measuring gate by quartz tester
Jewels 1 jewel
Use 10-second gate.
SEIKO SR927W, Maxell SR927W, Sony SR927W, EVEREADY 399
Battery life is approximately 2 years.
Voltage: 1.55 V
Battery
Liquid crystal panel unit

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Disassembling procedures Figs. : 1 →43
Reassembling procedures Figs. : 43 ←1
Lubricating: Types of oil Oil quantity
Moebius A Normal quantity
PARTS CATALOGUE Cal. Y911A
➡➡Please see the remarks on the following pages.
1 4281 609
Contact point spring
2 Liquid crystal
panel unit
6 4313 609
Connector
0022 247
• Battery clamp screw (1 pc.)
• Spacer screw (1 pc.)
• Battery connection (+) screw (2 pcs.)
• Coil block screw (1 pc.)
8 Dial
10 0271 933
Hour wheel
7 Hour, minute and
second hands
9 0491 735
Dial washer
Liquid crystal panel unit
4 4520 609
Liquid crystal panel
3 Dial ring
5 4512 609
Liquid crystal panel
frame

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➡➡Please see the remarks on the following pages.
PARTS CATALOGUE Cal. Y911A
17 4457 868
Circuit block cover
18 4216 609
Insulator for circuit block
19 4246 609
Buzzer lead terminal
20 4000 609
Circuit block
21 0439 609
Spacer
22 4410 609
Circuit cover
15 Winding stem
12 0022 247
Battery clamp screw
11 0110 869
System reset
comment sheet
13 4225 689
Battery clamp
14 Battery
(See the front page.)
16 0022 247
Spacer screw

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➡➡Please see the remarks on the following pages.
PARTS CATALOGUE Cal. Y911A
43 0100 619
Main plate
42 0221 929
Center wheel and pinion
41 0282 890
Clutch wheel
40 0384 890
Yoke
39 0383 176
Setting lever
38 4239 892
Rotor stator
37 4002 907
Coil block
36 0022 247
Coil block screw
35 0391 890
Train wheel setting lever
34 0281 904
Setting wheel
33 0261 908
Minute wheel
32 4146 886
Step rotor
31 0701 904
Fifth wheel and pinion
30 0231 904
Third wheel and pinion
29 0241 929
Fourth wheel and pinion
28 0125 619
Train wheel bridge
27 4311 609
Output lead terminal
26 4268 609
Battery connection (+)
25 0022 247
Battery connection (+) screw
24 4270 609
Battery connection (–)
23 4216 608
Insulator for battery

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PARTS CATALOGUE Cal. Y911A
TECHNICAL GUIDE Cal. Y911A
•The explanation here is only for the particular points of Cal. Y911A.
•For the repairing, checking and measuring procedures, refer to the “TECHNICAL GUIDE, GENERAL
INSTRUCTIONS”.
I. STRUCTURE OF CIRCUIT BLOCK
II. REMARKS ON REMOVING AND INSTALLING THE BATTERY
•To remove the battery, first, peel off the system reset comment
sheet, and then, remove the battery clamp.
•After installing the battery, be sure to attach the sheet at the
position indicated in the illustration at right.
Reset (AC) terminal Input terminal (+)
Input terminal (–)
Buzzer lead terminal
C-MOS-IC
Upconverter coil
System reset comment sheet
Post
Battery clamp screw
•After the battery is replaced with a new one, or after the battery
is re-installed following the repairing procedures, be sure to
short-circuit the AC terminal of the circuit block and the circuit
block cover with conductive tweezers to reset the circuit as
illustrated at right.
Circuit block cover
Tweezers
The type of winding stem is determined based on the design of cases. Check the case number and refer to
“PULSAR Casing Parts Catalogue” to choose a corresponding winding stem.
15 Winding stem 0351 880
Crystal unit
Coil output terminal
AC terminal
Remarks:

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TECHNICAL GUIDE Cal. Y911A
III. REMARKS ON DISASSEMBLING AND REASSEMBLING
•For disassembling and reassembling of Cal. Y911A, be sure to use the movement holders for exclusive use
with the movement.
Winding stem setting
position
•When disassembling or reassembling, be sure to ground the movement holders.
1 Contact point spring
•How to remove
1) Pull out the winding stem to the first click.
2) Hold the center of the contact point spring and lift
it up as shown in the illustration at right.
Note: Take care not to deform the contact point spring.
Winding stem setting
position
•Before removing the winding stem, be sure to remove the contact point spring.
Before installing the contact point spring, be sure to install the winding stem.
Contact point spring
Pull out the winding stem
to the first click.
Movement holder for anchoring
the caseback side
Movement holder for
anchoring the dial side

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TECHNICAL GUIDE Cal. Y911A
•How to install
1) Pull out the winding stem to the first click.
2) Set the slit portion (“A” portion in the illustration below) of the contact point spring to the winding stem,
and then insert the contact point spring in the gap between the movement and case.
3) Push down the contact point spring at the center until it is set properly.
4) Push the winding stem back in to the normal position.
•How to remove
Release all four hooks of the liquid crystal panel from
the movement, and then lift up the liquid crystal panel
unit.
•How to install
1) Set the three connectors to the connector guide
portions of the liquid crystal panel unit, and then, set
the panel unit level to the movement.
Contact point spring
2Liquid crystal panel unit
Pull out the winding stem
to the first click.
“A” portion
Winding stem
Contact point spring
Case
Movement
Contact point spring setting position
Connectors

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TECHNICAL GUIDE Cal. Y911A
3) After installing the liquid crystal panel unit, check
that all the segments of the display light up.
(To light up all the segments of the display, refer to
“All the segments lit up”.)
Note: If any of the segments do not light up, remove
the liquid crystal panel unit and re-install it.
3 Dial ring
4 Liquid crystal panel
5 Liquid crystal panel frame
First, reassemble the dial ring, liquid crystal panel and liquid crystal panel frame into a unit, and then, set the
unit to the movement.
•To reassemble the parts into the liquid crystal panel unit
1) Place the liquid crystal panel frame so that the panel
backlash correction spring portion is positioned at
upper right as shown in the illustration at right.
Panel backlash
correction spring
All the segments lit up
2) Set the liquid crystal panel to the liquid crystal panel
frame so that the three fish eyes and the center of the
three electrodes are positioned at the upper right
and at the bottom, respectively.
Electrode
Electrode
Electrode
Liquid crystal panel
Identification fish eyes
2) Press the liquid crystal panel unit evenly with a flat
plate or the like so that all the hooks at the 12 o’clock,
3 o’clock, 6 o’clock and 9 o’clock sides catch the
movement at the same time.
Note: Check that all the four hooks securely catch the movement.
Press the panel lightly and evenly.
Plastic plate
Liquid crystal panel unit
Movement holder for exclusive
use with Cal. Y911A
Post
Hole
Post
Hole

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TECHNICAL GUIDE Cal. Y911A
3) Set the dial ring to the liquid crystal panel frame so
that its thickest rim and the corner having one
protrusion are positioned atop and at the upper
right, respectively.
•Precautions on the liquid crystal panel
• Be sure to ground the movement holder.
• Use finger cots to hold the liquid crystal panel. Do not
hold it too tightly with tweezers, etc. The liquid crystal
panel is rather vulnerable to external pressure which
could cause the liquid crystal to leak.
• Hold the liquid crystal panel at the side faces, taking
care not to touch the electrodes.
• If dust collects on the liquid crystal panel, apply a
rodico gently to the dust to wipe it off.
• If the liquid crystal panel is soiled, wipe it gently with a
soft cloth soaked with alcohol.
17 Circuit block cover
•How to install
Have the three hooks of the circuit block cover catch the
main plate securely as shown in the illustration at right.
Hook
Hook
Thickest rim
Protrusion (1 pc.)
Dial ring Liquid crystal panel unit
spacer
Output lead
terminal
21 Spacer
Set the spacer as shown in the illustration at right.
•How to install
Hook

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TECHNICAL GUIDE Cal. Y911A
24 Battery connection (–)
Set the battery connection (–) to the main plate so that
there is no gap between them (“A” and “B” portions in
the illustration at right).
26 Battery connection (+)
Have the two hooks of the battery connection (+) catch
the main plate securely.
•How to install
•How to install
Main plate
A
Hook
28 Train wheel bridge
Refer to the illustrations below to check where to install the respective wheels.
•Setting position
Step rotor
Fifth wheel and pinion
Third wheel and pinion
Setting wheel
Fourth wheel and pinion
Minute wheel
Step rotor
Fifth wheel and pinion
Third wheel and pinion
Setting wheel
Center wheel and pinion
Refer to the illustration at right.
•Setting position
35 Train wheel setting lever
39 Setting lever
40 Yoke
Train wheel setting lever
Yoke
Setting lever
Battery connection (–)
B
Tube
Hook
Minute wheel
Fourth wheel
and pinion
Winding stem
Clutch wheel

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TECHNICAL GUIDE Cal. Y911A
IV. VALUE CHECKING
•Coil block resistance
•Upconverter coil resistance
1.8 KΩ~ 2.2 KΩ
120 Ω~ 180 Ω
•Current consumption
For the whole movement in the “Blank” display: Less than 1.3 µA
For the whole movement in any digital display with the stopwatch reset: Less than 33.0 µA
For the circuit block alone: Less than 0.7 µA
Measure the current consumption at 24°C ±2°C.
The current consumption for the liquid crystal panel used in this calibre fluctuates depending on the ambient
temperature. If the current consumption of the whole movement in any display with the stopwatch reset
cannot be measured within the above temperature range, refer to the table below to check if the obtained
current consumption is normal.
Remarks:
Ambient temperature
Allowable current
consumption
20°C24°C30°C
Less than 32 µA Less than 33 µA Less than 36 µA
<Measuring the current consumption for the whole movement>
1) After connecting the tester, pull out the crown to the first click and push it back in to the normal position.
2) Check that the digital display can be turned on and off, and then start the measurement.
To turn off the digital display, change the display to the CALENDAR and leave the watch untouched. The
display will be turned off automatically in about 10 seconds.
<Measuring the current consumption for the circuit block alone>
1) After connecting the tester as shown in the illustration below, short-circuit the reset pattern and (+) pattern.
2) Start the measurement more than 10 seconds after short-circuiting the patterns.
Reset pattern
(+) pattern

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Display
In normal display
(In “Blank” display)
•Time setting at
first click
TECHNICAL GUIDE Cal. Y911A
•All the segments lit up
Follow the procedure below to check that all the segments of the
display will light up.
1) Press button “A” in the “Blank” display.
2) Press button “C”.
3) Press button “B”.
4) Press buttons “B” and “C” at the same time.
•To return to the normal display, press button “A”, “B” or “C”.
All the segments lit up
•Checking the functions
For the crown and button functions in each display, refer to the
table below.
Crown
[Button position]
Button ACrown Button CButton B
•Calendar display •Calendar display
In CALENDAR
display
In SINGLE-TIME
ALARM display
•Time setting at
first click
In REGULAR
ALARM display
•Time setting at
first click
•Time setting at
first click
•Changeover of
display
•Selection of
single-time alarm
•Selection of
regular alarm
•Changeover of
display
•Increasing the digits
to be adjusted
•Decreasing the
digits to be adjusted
•Selection of
regular alarm
•Regular alarm
setting
•Alarm sound test
In REGULAR
ALARM SETTING
display
•Time setting at
first click
•Changeover of
display
•Selection of the
digits to be
adjusted
•Setting the digits
•Changeover of
display
•Start/stop •Lap/split/reset•Time setting at
first click
•Changeover
between lap time
and split time
displays
•Time setting at
first click
•Changeover of
display
•Recall of stored
data of lap/split
•Selection of
desired type of
data
In STOPWATCH
display
In MEMORY
RECALL display
•Setting the hands by
turning at first click
•Selection of the
digits to be
adjusted
•Setting the digits
In TIME SETTING
display
•Starting both digital
and analogue times
by pushing back in
to normal position
•Calendar display
•Changeover of
display
Button A
Button B
Button C

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TECHNICAL GUIDE Cal. Y911A
*In each display, guide marks are displayed to indicate button operations. Check them before operating
buttons.
* If the watch is left untouched in the display other than the TIME SETTING display for the times specified
below, the display will automatically return to the “Blank”display.
• In the CALENDAR and ALARM displays: 10 seconds
• In the STOPWATCH display: 10 minutes
• In the MEMORY RECALL display: 1 to 2 minutes
* When changing over the display to another, check if an abnormal display appears.
97-4 Printed in Japan
Note: If any malfunction is found after checking the functions, follow the procedure below to reset the
circuit. Then, check the functions again.
Circuit resetting procedure: Pull out the crown to the first click, and then, press all the buttons at the
same time for 2 to 3 seconds.