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PARTS CATALOGUE / TECHNICAL GUIDE
[SPECIFICATIONS]
Item
• 3 hands (hour, minute, and
small second hand)
• Big date calendar
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. 6N76A
Cal. No.
1 second
Stepping motor, 1 piece
• Electronic circuit reset switch
• Second setting device
• Date setting
Free
Date setting(clockwise)
Time setting, hand position adjustment / resetting the circuit
Monthly rate: Less than 20 seconds (worn on the wrist at the tempera-
ture between 5 and 35)
Nil
Use 10-second gate.
Movement: Less than 0.83 μA
Circuit block: Less than 0.27 μA
4004274 (CIRCUIT BLOCK WITH COIL BLOCK)
2.1 - 2.3 KΩ
SEIKO SR621SW
1.55 V
Approx. 3 years
0 jewel
6N76A
• Diameter
Outside: Ø 26.4 mm
• Height: 3.4 mm
1/18
Casing: Ø 25.6 mm
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Summary of Contents for Seiko 6N76A
- Page 1 PARTS CATALOGUE / TECHNICAL GUIDE Cal. 6N76A [SPECIFICATIONS] Cal. No. 6N76A Item • 3 hands (hour, minute, and • Diameter small second hand) Outside: Ø 26.4 mm Casing: Ø 25.6 mm • Big date calendar • Height: 3.4 mm Interval of hands movement...
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Page 2: Specifications
SPECIFICATIONS Cal. 6N76A Cal. 6N76A is an analogue quartz movement with three hands (hour, minute and second), employing a Big Date calendar. The date frame has been enlarged compared to those from existing calibers, increasing the legibility and practicality. FEATURES Cal. -
Page 3: Parts List
PARTS LIST Cal. 6N76A Disassembling procedures Figs. : ① ㉞ Reassembling procedures Figs. : ㉞ ① ① HOuR, mINuTE AND SECOND Types of oil HANDS AO-3 AO-2 Oil quantity NORMAL QUANTITY ② DIAL ③ SNAp fOR SECOND DATE INDICATOR 0963230 ❺... - Page 4 PARTS LIST Cal. 6N76A ⓮ battery ⑮ Winding stem 0351001 ⑯ battery connection (+) screW 0016121 ⓱ battery connection (+) 4268066 ⓲ insulator 4216088 Picture after ⓱ battery connection (+) is installed. ⑲ battery connection (-) 4270385 ⓴ train Wheel bridge 0125297 ㉑...
- Page 5 PARTS LIST Cal. 6N76A ● 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 5/18...
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Page 6: Technical Guide
Cal. 6N76A ● How to find the correct parts, if not determined by 4 digit caliber number following parts are determined based on the design of cases. please refer to the SEIKO WATCH pARTS CATAlOguE in order to choose corresponding parts. - Page 7 TECHNICAL GUIDE Cal. 6N76A 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 8 TECHNICAL GUIDE Cal. 6N76A ● How to install the DATE DIAL GUARD ⑧ DATE DiAl guArD 1) Put the date dial guard on the main plate so that the A and B portions are over the guide Protrusion C B Portion pins, as shown in the illustrations at right.
- Page 9 TECHNICAL GUIDE Cal. 6N76A ● Remarks for installing the BATTERY CONNECTION (+) Set it so that the hook portions (3 places) catch the main plate (Fig.1&2). In disassembling and reassembling, take care not to deform the hook portions. After installing the battery connection (+), check that the three hook portions securely catch the main plate.
- Page 10 TECHNICAL GUIDE Cal. 6N76A ● Remarks for setting position of the TRAIN WHEEL BRIDGE Notes: Since the fifth wheel and pinion and step rotor are made of plastic, take care not to damage them in disassembling and reassembling. Third wheel and pinion...
- Page 11 TECHNICAL GUIDE Cal. 6N76A ● Remarks for disassembling and reassembling PIN FOR SETTING WHEEL Notes: In disassembling and reassembling, take care not to damage the portion that is assembled to the pin. (The portion that is assembled to the pin is made of plastics and can be damaged easily.) 1) In disassembling, pick up the pin vertically from the main plate with care.
- Page 12 TECHNICAL GUIDE Cal. 6N76A ● Remarks for disassembling and reassembling POSITIONING LEVER Notes: It can be dissassembled and reassembled only at notch on the first date indicator. (It is impossible to disassemble/reassemble at any other position. ) notch on the fIRST DATE INDICATOR fIRST DATE INDICATOR ⑤...
- Page 13 TECHNICAL GUIDE Cal. 6N76A ● How to set the FIRST DATE INDICATOR and the SECOND DATE INDICATOR 1) Calendar at 6 o’clock position ③ Second date indicator position ① First position at random ② First date indicator position s e t t i n g : R o t a t e i t i n t h e...
- Page 14 * 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. Connect the AC component to the positive terminal for 2 seconds until a short circuit occurs to reset the integrated circuit.
- Page 15 TECHNICAL GUIDE Cal. 6N76A [Structure of the CIRCUIT BLOCK] Notes : Since the circuit block and coil block are made by one piece, in disassembling and reassembling take care not to cut the coil line. Crystal unit Input terminal (+)
- Page 16 - date the hour and minute change hands pass around midnight. Note: The design of the calendar in the above images are different from 6N76A, but function checking process for 6N76A is same as the basic caliber. 16/18...
- Page 17 TECHNICAL GUIDE Cal. 6N76A ● 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. 6N76A tRoUBlEshootiNG Symptom Possible causes Solutions Movement Measure the battery voltage. The watch stops operat- The battery has been depleted. Replace the battery with a ing. new one. The hour wheel and the pinion Check the relevant parts, and...
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