Seiko 5M84A Parts List/Technical Manual
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Seiko 5M84A Parts List/Technical Manual

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PARTS LIST/ TECHNICAL GUIDE
[SPECIFICATIONS]
Item
• 3 hands
• Calendar
Interval of hands movements
Driving system
Additional function
Normal position
Crown operation
1st click position
2nd click position
Loss/Gain
Regulation system
Gate time for rate measurement
Current consumption
Coil resistance
Power generator
Power supply
D u r a t i o n o f
Number of jewels
KINETIC Cal. 5M84A
Cal. No.
(Hour/Minute/Second)
Date (date dial)
Day (retrograde day indicator)
1 second
Stepping motor 2 pieces
• Power reserve indicator (second hand)
• Energy depletion forewarning function
• Overcharge prevention function
• Electronic circuit reset function
• Day and date correction function
• Second hand stop function
Free
Day and date setting
Time setting (Hour and Minute)
Monthly rate: less than 15 seconds (worn on the wrist at temperature
range between 5 and 35 ºC)
Nil
Use 10-second gate
Movement:
Circuit block:
Coil block:
Generating coil block:
Automatic generating system
Rechargeable
MT920 Titanium carbon lithium rechargeable battery
battery
Operating
0.9V - 2.20V
voltage range
From full charge to stoppage: approximately 6 months
charge
6 jewels
5M84A
Movement
•　Diameter
Outside : Ø 27.6 mm Casing : Ø 27.0 mm
•
Height: 4.3 mm
less than 0.80 µA
less than 0.20 µA
1.70 - 2.10 KΩ
280 - 380Ω
1/21

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Summary of Contents for Seiko 5M84A

  • Page 1 PARTS LIST/ TECHNICAL GUIDE KINETIC Cal. 5M84A [SPECIFICATIONS] Cal. No. 5M84A Item Movement •　Diameter • 3 hands (Hour/Minute/Second) Outside : Ø 27.6 mm Casing : Ø 27.0 mm • Calendar Date (date dial) • Height: 4.3 mm Day (retrograde day indicator)

  • Page 2: Specifications

    POWER RESERVE INDICATOR Cal. 5M84A is equipped with a power reserve indicator. The current power reserve can be checked by reading the posisiton of the second hand after pressing the button at the 2 o'clock position.

  • Page 3: Parts List

    Cal. 5M84A Disassembling procedures Figs. : Reassembling procedures Figs. : Lubricating: Types of oil Watch Oil AO-3 Watch Oil AO-2 SEIKO Watch Oil S-6 Silicone oil 500,000 c.s. Oil quantity Normal quantity [CASING PARTS ASSEMBLY] CASE BACK CASE BACK GASKET...
  • Page 4 PARTS LIST Cal. 5M84A [CALENDAR MECHANISM/ DIAL AND HANDS SETTING] HOUR, MINUTE AND SECOND HANDS RETROGRADE DAY HAND DIAL SPACER FOR DIAL 4408564 HOLDING RING FOR DIAL 0866*** DAY LEVER GUARD SCREW 0012354 DAY LEVER GUARD 0837503 DAY WHEEL 1002516...
  • Page 5 PARTS LIST Cal. 5M84A [AUTOMATIC GENERATING OSCILLATING WEIGHT SCREW 0022490 MECHANISM/ELECTRONIC CIRCUIT] OSCILLATING WEIGHT 0500665 OSCILLATING WEIGHT WHEEL 1002662 RECHARGEABLE BATTERY CLAMP SCREW 0022247 RECHARGEABLE BATTERY CLAMP 4225519 INSULATOR FOR RECHARGEABLE BATTERY 4216519 RECHARGEABLE BATTERY UNIT 302324T CIRCUIT BLOCK COVER SCREW...
  • Page 6 PARTS LIST Cal. 5M84A [GEAR TRAIN MECHANISM/ TRAIN WHEEL BRIDGE SCREW 0022247 SETTING MECHANISM] TRAIN WHEEL BRIDGE 0125661 TRAIN WHEEL SETTING LEVER 0391660 RECHARGEABLE BATTERY CONNECTION (+) 4271515 FOURTH WHEEL AND PINION 0241667 THIRD WHEEL AND PINION 0231530 FIFTH WHEEL AND PINION...
  • Page 7 How to find the correct parts, if not determined by 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.
  • Page 8 PARTS LIST Cal. 5M84A l Tools and consumables required for disassembling/reassembling • Movement holder Universal movement holder (S-682) • Watch oils SEIKO watch grease (S-6) and watch oils (AO-3 and AO-2) AO-3 AO-2 8/21...
  • Page 9 TECHNICAL GUIDE Cal. 5M84A REMARKS ON DE-CASING/CASING/DIAL AND HAND SETTING RETROGRADE DAY HAND l How to set the RETROGRADE DAY HAND at the first day position Make sure the DAY LEVER and the DAY STAR WHEEL are at the 1st day position by listening the sound when changing the day.
  • Page 10 TECHNICAL GUIDE Cal. 5M84A 35 RECHARGEABLE BATTERY UNIT Though the RECHARGEABLE BATTERY UNIT for Cal. 5M8 Series is of a completely different from Cal. 5M6 Series, they have a close resemblance in shape. They can be discriminated by the shapes of their minus lead terminals as illustrated below.
  • Page 11 TECHNICAL GUIDE Cal. 5M84A 38 CIRCUIT BLOCK 4000 789 The CIRCUIT BLOCK for Cal. 5M8 Series and that for Cal. 5M6 Series have a close resemblance in shape. They can be discriminated in the point that the CIRCUIT BLOCK for Cal. 5M8 Series has no condenser unlike that for Cal.
  • Page 12 TECHNICAL GUIDE Cal. 5M84A REMARKS ON DISSASEMBLING AND REASSEMBLING THE MOVEMENT l How to remove the SETTING STEM before dismantling the movement Crown position: 1st click position Push the SETTING LEVER gently (refer to the picture on the right) in order to disengage it from the SETTING STEM.
  • Page 13 TECHNICAL GUIDE Cal. 5M84A l Gear train mechanism - train wheels, setting position and lubricating 52 FOURTH WHEEL AND PINION 53 THIRD WHEEL AND PINION 54 FIFTH WHEEL AND PINION 55 STEP ROTOR 56 MINUTE WHEEL 57 SETTING WHEEL 64 CENTER WHEEL AND PINION •...
  • Page 14 TECHNICAL GUIDE Cal. 5M84A l Automatic generating mechanism • How to remove Insert the tip of tweezers into the “C” “A” portion ﾒBﾒ portion portion gap in the illustration at right, and pry up the RECHARGEABLE BATTERY UNIT to remove it.

  • Page 15: Value Checking

    CIRCUIT BLOCK COVER. “a” portion * When measuring the current consumption using the SEIKO digital multi-tester (S-860), use the range of 40 μ A of SUPPLY V (= 1.55 V) & GATE TIME (2 S) 15/21...
  • Page 16 TECHNICAL GUIDE Cal. 5M84A 3. Swing the OSCILLATING WEIGHT as the illustration for more than three seconds so that the movement detects the electricity generation and it turns to the normal hand movement mode. Note: When swinging the OSCILLATING WEIGHT, take care so as not to touch the probes of the tester.
  • Page 17 (+) or negative (-) input terminal of the CIRCUIT BLOCK (please refer to “Structure of the circuit block” below). * When measuring the current consumption using the SEIKO digital multi-tester (S-860), use the range of 40 μ A of SUPPLY V (= 1.55 V) & GATE TIME (2 S) 2.
  • Page 18 TECHNICAL GUIDE Cal. 5M84A l Value checking • Coil resistance (coil blocks) Check the resistance of each COIL BLOCK if they are within the range in the following table. COIL BLOCK 1.7 KΩ - 2.1 KΩ 4002516 GENERATING COIL 280 Ω - 380 Ω...
  • Page 19 TECHNICAL GUIDE Cal. 5M84A Operation Function Checkpoint Pull out the crown to the 2nd Make sure that it has click and push it Setting mechanism - a click at each back in to the switching the position and the normal　...

  • Page 20: Accuracy Test

    TECHNICAL GUIDE Cal. 5M84A l Water resistance test 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 overpressure test 3 BAR WATER RESIST 5BAR...

  • Page 21: Technical Guide

    TECHNICAL GUIDE Cal. 5M84A TROUBLESHOOTING Problems Possible causes Methods of repair and checking The OSCILLATING WEIGHT 1) The COIL of the 1) Check the resistance of the rotates at an abnormally high GENERATING COIL BLOCK is GENERATING COIL BLOCK. rate, and no charging is made.

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