Seiko 5Y85A Quick start guide

1
PARTS CATALOGUE /TECHNICAL GUIDE
Cal. 5Y85A/5Y89A
[SPECIFICATIONS]
Cal. No.
Item 5Y85A 5Y89A
Movement
(x 1.0)The illustrations refer to Cal. 5Y89A.
Movement
size ø 24.0 mm
21.5 mm between 3 o’clock and 9 o’clock sides
21.5 mm between 6 o’clock and 12 o’clock sides
ø 23.3 mm
21.3 mm between 3 o’clock and 9 o’clock sides
21.5 mm between 6 o’clock and 12 o’clock sides
Time indication 3 hands (hour, minute and second hands)
Outside diameter
Casing diameter
Height 3.05 mm (Including battery portion)
Driving system
Additional mechanism
Loss/gain
Monthly rate within normal temperature range: less than 20 seconds
Regulation system Nil
Measuring gate by quartz tester Use 10-second gate
SEIKO SR916SW
Battery Battery No.
Voltage 1.55 V
Battery life Approximately 3 years
Jewels 1 jewel
Step motor (Load compensated driving pulse type)
•Day calendar
•Instant setting divice for day calendar
•Date calendar
•Electronic circuit reset switch
• Train wheel setting device
• 24 hour dial disk

PARTS CATALOGUE Cal. 5Y85A/5Y89A
2
Please see the remarks on the following pages.
Lubricating of some parts is shown in “II. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
Disassembling procedures Figs. : 1 46
Reassembling procedures Figs. : 46 1
Lubricating : Types of oil Oil quantity
Moebius A
Moebius F
SEIKO Watch Oil S-6
Normal quantity
Large quantity
9Date driving wheel
0802 535
10 Intermediate date wheel A
0802 535 (For 5Y85A only)
11 Intermediate date wheel B
0158 540 (For 5Y85A only)
12 24-hour hand wheel
0157 540
13 Day driving wheel
0802 570
14 Day wheel
1002 549 (5Y85A)
1002 538 (5Y89A)
18 Date dial guard screw
0022 248
19 Hour wheel guard
0376 549 (5Y85A)
0376 540 (5Y89A)
24 Hour wheel
0271 538
2Hour, minute and second hands
5Date hand
6Dial
8Calendar mechanism plate
0839 549 (5Y85A)
0839 543 (5Y89A)
15 Date star
0970 538
16 Date corrector setting wheel
0804 570
17 Intermediate date wheel
0817 570
20 Calendar corrector setting wheel
0737 530
21 Intermediate wheel for calendar correction C
0962 531 (For 5Y85A only)
22 Intermediate wheel for calendar correction B
0962 531 (For 5Y85A only)
23 Intermediate wheel for calendar correction A
0962 531 (For 5Y85A only)
1Case ring
4 Day hand
324-hour hand
5Y85A/5Y89A
Theillustrationbelowisbasedon the Cal. 5Y89A. The
exclusive parts for the Cal. 5Y85A are additionally
indicated.
Remarks
Some parts have different parts codes between the
Cal. 5Y85A and Cal. 5Y89A. Some parts are used only
for the Cal.5Y85A.
7Date dial guard screw
0022 230

PARTS CATALOGUE Cal. 5Y85A/5Y89A
3
Please see the remarks on the following pages.
Lubricating of some parts is shown in “II. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
28 Circuit block
4001 748
39 Rotor stator
4239 530
25 Battery
26 Battery connection (+) screw
0012 354
27 Battery connection (+)
4268 547 (5Y85A)
4271 552 (5Y89A)
29 Coil block screw
0012 354
30 Coil block
4002 531
31 Battery connection (-)
4270 531
32 Train wheel bridge screw
0012 354
33 Train wheel bridge
0125 530
34 Fourth wheel & pinion
0241 537
35 Third wheel & pinion
0231 530
36 Fifth wheel & pinion
0701 530
37 Train wheel setting lever
0391 530
38 Step rotor
4146 531
40 Minute wheel
0261 530
41 Center wheel & pinion
0221 537
42 Yoke
0384 530
43 Setting lever
0383 530
44 Setting wheel
0281 530
45 Clutch wheel
0282 530
5Y85A/5Y89A
The parts shown below are the common parts except for 27 Battery connection (+).
46 Winding stem
0354 530

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TECHNICAL GUIDE Cal. 5Y85A/5Y89A
●The explanation here is only for the particular points of the Cal. 5Y85A and 5Y89A.
●For preparing, checking and measuring procedures, refer to the “TECHNICAL GUIDE, GENERAL
INSTRUCTIONS”.
I. REMARKS ON DISASSEMBLING AND REASSEMBLING
2 Hour, minute, second hands ~ 5 Date hand
■How to install the hands
1. Pull out the crown to the second click. Rotate the crown until the date, and subsequently, the day of the
week change. After confirming the completion of the date and the day of the week change, set the dial.
2. Install the date hand and the day hand in order.
3. Rotate the crown further until just after the date changes.
4. Install the 24-hour hand at the 24 o’clock (zero) position.
5. Install the hour, minute and second hands to the 12 o’clock position.
■Remarks on removing the small hands (Date, day and 24-hour hands)
• When pulling out the small hands, be sure to hold the dial while pulling them out.
•When pulling out a small hand, put the hand remover under the pipe of the hand and then remove the
hand.
Small hand Pipe
Dial
Insert the hand remover here.
8Calendar mechanism plate
Lubricating
Date jumper section Day jumper section

5
TECHNICAL GUIDE Cal. 5Y85A
Area A Edge of the teeth
Hour wheel
Area B
Claw b
Date driving wheel Day driving wheel
Claw c
Area C
■How to install the calendar wheels for the Cal. 5Y85A
Refer to the illustration below to install the calendar wheels for the Cal. 5Y85A.
Set the jumpers to mesh with the gear teeth.
10 Intermediate date wheel A ~ 17 Intermediate date wheel,
19 Hour wheel guard ~ 24 Hour wheel
• Set the hour wheel so that any of its eight teeth is in the Area A on the hour wheel guard.
•Set the date driving wheel so that its claw b is in the Area B on the main plate.
•Set the day driving wheel so that its claw c is in the Area C on the main plate.
5Y85A
21 Intermediate wheel for
calendar correction C
20 Calendar corrector
setting wheel
22 Intermediate wheel for
calendar correction B
19 Hour wheel guard
10 Intermediate date wheel A 11 Intermediate date wheel B
12 24-hour hand wheel
13 Day driving
wheel
15 Date star
14 Day wheel
16 Date corrector setting wheel
Day jumper
Area A
Area B
Area C
Date jumper
9Date driving wheel
24 Hour wheel
17 Intermediate date wheel
23 Intermediate wheel for
calendar correction A

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TECHNICAL GUIDE
Area A
Claw a
Date driving wheel Day driving wheel
Claw b
Area B
■How to install the calendar wheels for the Cal. 5Y89A
Refer to the illustration below to install the calendar wheels for the Cal. 5Y89A.
19 Hour wheel guard is omitted from the illustration.
Set the jumpers to mesh with the gear teeth.
•Set the Date driving wheel so that its claw a is in the Area A on the main plate.
•Set the Day driving wheel so that its claw b is in the Area B on the main plate.
9Date driving wheel , 12 24-hour hand wheel ~ 17 Intermediate date wheel,
20 Calendar corrector setting wheel, 21 Intermediate wheel for calendar correction C, 24 Hour wheel
5Y89A
12 24-hour hand wheel
13 Day driving wheel
15 Date star
14 Day wheel
16 Date corrector setting wheel
17 Intermediate date
wheel
20 Calendar corrector setting wheel
9Date driving wheel
24 Hour wheel
Date jumper
Area A
Day jumper
Area B
21 Intermediate wheel for
calendar correction C

7
TECHNICAL GUIDE Cal. 5Y85A/5Y89A
Moebius A
Moebius A
20 Calendar corrector setting wheel D
Lubricating
Lubricate the inner edge of the oval hole on the main plate where the calendar corrector
setting wheel oscillates.
21 Intermediate wheel for calendar correction C ~ 23 Intermediate wheel for calendar correction A
Lubricating
Oval hole on the main plate
II. Value checking
■Coil block resistance
3.0 kW~ 3.4 kW
■Current consumption
For the whole movement : Less than 1.2 mA
For the circuit block only : Less than 0.4 mA
III. Troubleshooting
Symptoms Problems Solutions
The watch stops. The battery is weak or dead.
The hands are worn out.
The coil is burned out.
The wheels are soiled with dirt
and dust. The amount of oil is
excessive(wringing) .
Measurethebattery voltage.Changethebattery.
Change the hands.
Measure the coil block resistance. Change the
coil block.
Remove all dust or dirt. Clean up the relevant
parts. Be careful not to damage the teeth of the
plastic parts while cleaning.
Thecurrentconsumption
for the whole movement
is excessive.
Dirt, dust or chips are adhere to
the movement.
Thedrivingpulseisgenerated due
totheexcessiveload tothewheels.
(The oil is deteriorated, leaked or
ran out.)
Measurethe currentconsumption forthe circuit
block alone. If the result is within the standard
range, overhaul and clean the movement parts,
and then measure the current consumption for
the whole movement again.
The date or day hand
dose not move. The relevant wheels are
disengaged.
The relevant jumpers are
disengaged.
Checkthesettingpositionof therelevant wheels
and jumpers.
The date or day of the
weekchangesatawrong
timing.
The date driving wheel and/or day
driving wheel are wrongly
installed.
The hour, minute hands are
wrongly installed.
Reinstall the relevant wheels correctly. (Refer
to the instructions on the page 5 and 6.)
Reinstall the hour and minute hands. (Refer to
the instructions on the page 4.)
Remove all dust or dirt.
2004-04