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PARTS CATALOGUE / TECHNICAL GUIDE
[SPECIFICATIONS]
Item
• 3 hands (hour, minute, and
small second hand)
• 24-hour indicator
• Date indicator
Interval of hands movement
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
Battery No.
Power
supply
Battery voltage
Battery life
Number of jewels
Cal. 8T63A
Cal. No.
1 second
Stepping motor, 2 pieces
• Stopwatch function
60-minute stopwatch in one second increments.
• Second hand stop function
• Energy depletion forewarning function (The second hand moves at
two-second interals.)
Free
Date setting(clockwise)
Time setting, hand position adjustment / resetting the circuit
Monthly rate: Less than 15 seconds (worn on the wrist at the temperature
between 5 and 35)
Nil
Use 10-second gate.
Movement: Less than 2.70 μA
Circuit block: Less than 0.70 μA
4002054 (COIL BLOCK A)
1.45 - 1.65 KΩ
4002055 (COIL BLOCK B)
1.65 - 1.85 KΩ
SEIKO SR936SW
1.55 V
Approx. 3 years
0 jewel
8T63A
• Diameter
Outside: Ø 30.8 mm
• Height: 5.1 mm
1/19
Casing: Ø 29.0 mm
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Summary of Contents for Seiko 8T63A
- Page 1 PARTS CATALOGUE / TECHNICAL GUIDE Cal. 8T63A [SPECIFICATIONS] Cal. No. 8T63A Item • 3 hands (hour, minute, and • Diameter small second hand) Outside: Ø 30.8 mm Casing: Ø 29.0 mm • 24-hour indicator • Date indicator • Height: 5.1 mm...
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Page 2: Specifications
SPECIFICATIONS Cal. 8T63A Cal. 8T63A has a new structure employing one crown and two buttons. The construction of chronograph mechanism is based on Cal. 8R28 mechanical chronograph watch by using the one-piece 3 pointed reset hammer. While other Swiss-made watches are using separate hammers which require an assembly and adjustment of the hammers, the one-piece hammer design realizes maximum durability and stability of the component and easier maintenance. - Page 3 SPECIFICATIONS Cal. 8T63A ● Measurement functions Accumulated elapsed time measurement and split time measurement are available. Standard measurement Button A Button A Button B → → START STOP RESET A ccumulated elapsed time measurement Button A Button A Button A...
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Page 4: Parts List
PARTS LIST Cal. 8T63A Type of oil Oil quantity mark AO-3 SMALL QUANTITY Disassembling procedures Figs. : AO-2 NORMAL QUANTITY Reassembling procedures Figs. : LIBERAL QUANTITY DATE INDICATOR MAINTAINING PLATE SCREW 0012354 DATE INDICATOR MAINTAINING PLATE 0808052 DATE DIAL 0878***... - Page 5 PARTS LIST Cal. 8T63A HOUR WHEEL 0273*** SWITCH LEVER HOLDER SCREW 0012354 SWITCH LEVER HOLDER 0837005 SWITCH LEVER A 4450017 SWITCH LEVER B 4450018 DATE CORRECTOR SETTING TRANSMISSION WHEEL C 0962891 DATE CORRECTOR SETTING TRANSMISSION WHEEL B 0962013 For parts , please refer to the page 10.
- Page 6 PARTS LIST Cal. 8T63A 15 SWITCH SPRING SCREW 0016121 15 SWITCH SPRING SCREW 0016121 SWITCH SPRING 4250*** 17 SECOND COUNTING WHEEL FRICTION SPRING 0353018 18 CHRONOGRAPH BRIDGE 0190007 HAMMER OPERATING LEVER B 0587006 CHRONOGRAPH HAMMER COUPLING LEVER 0585013 0581007 SECOND...
- Page 7 PARTS LIST Cal. 8T63A 27 LOWER PLATE FOR CHRONOGRAPH BRIDGE SCREW LOWER PLATE FOR 0016121 CHRONOGRAPH BRIDGE 0186002 29 CIRCUIT BLOCK SPACER 4408149 30 CIRCUIT BLOCK 4004353 32 TRAIN WHEEL BRIDGE 0125318 31 BATTERY CONNECTION (-) 4270336 33 MINUTE COUNTER...
- Page 8 PARTS LIST Cal. 8T63A 44 THIRD WHEEL AND PINION 0231059 43 RESET LEVER 4455006 45 FOURTH WHEEL AND PINION 0144002 50 TRAIN WHEEL SETTING LEVER 46 MINUTE WHEEL 0391028 AND PINION 0261126 51 COIL BLOCK SCREW 0012354 47 SETTING WHEEL...
- Page 9 PARTS LIST Cal. 8T63A ● Tools and consumables required for disassembling/reassembling • Movement holder UNIVERSAL MOVEMENT HOLDER (S-682) • Watch oils SEIKO watch oil AO-3 (or Moebius A) and AO-2 (or Moebius F) AO-3 AO-2 9/19...
- Page 10 ● 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 11 TECHNICAL GUIDE Cal. 8T63A REMARKS ON DISASSEMBLING AND REASSEMBLING THE MOVEMENT ● How to remove the SETTING STEM before dismantling the movement Crown position: normal (=0) position. Push the "A" on the SETTING LEVER gently(refer to the picture on the right) in order to disengage it from the SETTING STEM.
- Page 12 TECHNICAL GUIDE Cal. 8T63A ● Remarks for the lubrication Oil quantity mark Type of oil Hammer AO-3 SMALL QUANTITY AO-2 NORMAL QUANTITY LIBERAL QUANTITY There must be oil within the range of the arrow. Lower plate for chronograph bridge Note *1: Oiling should be done on the pointed spot of marked place.
- Page 13 TECHNICAL GUIDE Cal. 8T63A ● Remarks for setting position of the spring of chronograph function Lower plate for Train wheel stop lever chronograph bridge Hammer operating Hammer lever A Hammer operating Chronograph coupling lever B lever Setting position ● Remarks for setting position of the SWITCH LEVER A and B...
- Page 14 STOPWATCH MINUTE HAND REMARKS ON INSPECTION AND MEASUREMENT Current consumption for the whole movement 1. Use the SEIKO digital multi-tester (S-860), and set to the range of 40 μ A of SUPPLY V (= 1.55 V) & GATE TIME (2 S).
- Page 15 TECHNICAL GUIDE Cal. 8T63A [Structure of the CIRCUIT BLOCK] C=MOS=IC Input terminal (-) Input terminal (+) Output terminal(CG) Crystal unit Output terminal(hand moving) ● Value checking – coil resistance (coil blocks) Check the resistance of each coil block if they are within the range in the following table.
- Page 16 TECHNICAL GUIDE Cal. 8T63A ● Function check Operation Function Checkpoint Pull out the crown to the 2nd c lic k M a k e s u r e t h a t i t Setting mechanism and push it back...
- Page 17 TECHNICAL GUIDE Cal. 8T63A ● 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) 3 BAR Air leak test WATER RESIST 5BAR...
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Page 18: Troubleshooting
TECHNICAL GUIDE Cal. 8T63A TROUBLESHOOTING Symptom Possible causes Solutions Measure the bat ter y voltage. Movement The watch stops operating. The battery has been depleted. Replace the battery with a new one. The hour wheel and the pinion of Check the relevant par ts, and... -
Page 19: Technical Guide
TECHNICAL GUIDE Cal. 8T63A Symptom Possible causes Solutions Measure the coil block resistance. STOPWATCH O n e o r m o r e S T O P - The relevant coil is broken. Replace the coil with a new one if W A T C H h a n d s h a v e necessary.