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PARTS CATALOGUE / TECHNICAL GUIDE
[SPECIFICATIONS]
Cal. No.
Item
• 3 hands (hour, minute,
and small second
hand)
• 24-hour indicator
• Big 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. 7T04A
• Diameter
Outside: Ø 27.6 mm
• Height: 4.93 mm
1 second
Stepping motor, 3 pieces
• Stopwatch function
60-minute stopwatch in 1/5-second increments.
• Battery life indicator (The small second hand moves at two-second
intervals.)
• Second hand stop function
• Electronic circuit reset function
• Big date indicator function
Free
Date setting(clockwise)
Time setting, hand position adjustment / resetting the circuit
Monthly rate: Less than 15 seconds (worn on the wrist at the tempera-
ture between 5 and 35)
Nil
Use 10-second gate.
Movement: Less than 1.10 μA
Circuit block: Less than 0.20 μA
4002700 (COIL BLOCK and COIL BLOCK FOR SECONDS COUNTING)
2.10 - 2.70 KΩ
4002711 (COIL BLOCK FOR MINUTE COUNTING)
1.80 - 2.40 KΩ
SEIKO SR927SW
1.55 V
Approx. 5 years
0 jewel
/2
7T04A
Casing: Ø 27.0 mm
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Summary of Contents for Seiko 7T04A
- Page 1 PARTS CATALOGUE / TECHNICAL GUIDE Cal. 7T04A [SPECIFICATIONS] Cal. No. 7T04A Item • 3 hands (hour, minute, • Diameter and small second Outside: Ø 27.6 mm Casing: Ø 27.0 mm hand) • 24-hour indicator • Height: 4.93 mm • Big date indicator...
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Page 2: Specifications
Cal. 7T04A SPECIFICATIONS Cal. 7T04A is a new basic calibre which has a big date indicator function, but the basic movement structure of Cal. 7T04A is similar to the previous Cal. 7T Series watches, and the knowledge and technique you have gained in handling the previous Cal. 7T Series watches will come in handy when you repair Cal. -
Page 3: Necessary Procedure After Battery Change
Cal. 7T04A SPECIFICATIONS ● 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... -
Page 4: Parts List
PARTS LIST Cal. 7T04A 1 DATE DIAL SCREW FOR TEN’S DIGIT Disassembling procedures Figs. : 0012354 Reassembling procedures Figs. : 2 DATE DIAL FOR TEN’S DIGIT 0878B95 Remarks on removing the Setting stem To remove the SETTING STEM when taking... - Page 5 PARTS LIST Cal. 7T04A 10 CALENDAR PLATE SCREW 0012354 11 CALENDAR PLATE 0712505 12 CALENDAR CORRECTOR WHEEL 0737505 13 24 HOUR WHEEL 1002534 14 INTERMEDIATE WHEEL FOR 24 HOUR WHEEL 15 PIN FOR 24 HOUR 0817536 WHEEL PLATE 0027973 16 24 HOUR WHEEL PLATE...
- Page 6 PARTS LIST Cal. 7T04A BATTERY CLAMP SCREW 0022230 BATTERY CLAMP 4225576 0022230 BATTERY (SR927SW) BATTERY CLAMP SCREW CIRCUIT BLOCK COVER SCREW 0022459 0022459 CIRCUIT BLOCK COVER CIRCUIT BLOCK COVER SCREW 4457814 [GEAR TRAIN MECHANISM] FRICTIOIN SPRING FOR SECONDS COUNTING 0396580...
- Page 7 PARTS LIST Cal. 7T04A [SETTING MECHANISM/STEPPING MOTORS COIL BLOCK FOR (STATORS AND COIL BLOCKS)] MINUTE COUNTING 4002711 42 COIL BLOCK 4002700 SPACER B 0439594 COIL BLOCK FOR SECONDS COUNTING 4002700 ROTOR FOR MINUTE COUNTING 4146710 ROTOR 4146710 ROTOR FOR SWITCH LEVER FOR START/...
- Page 8 ● How to find the correct parts, if not determined by 4 digit calibre 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 9 U N I V E R S A L M O V E M E N T H O L D E R (S-682) • Watch oils SEIKO watch grease S-6 and S-4. watch oil AO-3 (or Moebius A) AO-3 /21...
- Page 10 TECHNICAL GUIDE Cal. 7T04A REMARKS ON DISASSEMBLING AND REASSEMBLING THE MOVEMENT ● CALENDAR MECHANISM PARTS: DATE DIAL SCREW FOR TEN’S DIGIT DATE DIAL FOR TEN’S DIGIT DATE JUMPER FOR TEN’S DIGIT 1. Lubricate the shaft of DATE DIAL FOR TEN'S DIGIT. Type of oil: AO-3 2. A s s e m b l i n g g u i d e h o l e f o r DAT E DI A L FOR TEN’S DIGIT...
- Page 11 TECHNICAL GUIDE Cal. 7T04A PARTS: DATE DISK FOR UNIT'S DIGIT DATE JUMPER FOR UNIT'S DIGIT 1. Reassemble the DATE DISK FOR UNIT'S DIGIT to the CALENDAR PLATE by setting the assembling guide nick of DATE DISK FOR UNIT'S DIGIT to the guide point on the CALENDAR PLATE (near the 12H position) as per left image. 2. Please make sure that the DATE JUMPER FOR UNIT'S DIGIT engages with the DATE DISK FOR UNIT'S DIGIT properly.
- Page 12 • Setting position and lubricating SWITCH LEVER FOR START/STOP BUTTON SETTING LEVER YOKE TRAIN WHEEL SETTING LEVER TRAIN WHEEL SETTING LEVER YOKE SETTING LEVER SWITCH LEVER FOR START/ STOP BUTTON SETTING STEM AO-3 (or MS-A) SEIKO Watch Oil S-6 12/21...
- Page 13 TECHNICAL GUIDE Cal. 7T04A ● Gear train mechanism After setting the 29 TRAIN WHEEL BRIDGE and 32 PIN FOR TRAIN WHEEL BRIDGE as illustrated be- low, lubricate the upper pivots of the following parts: 47 ROTOR, 48 ROTOR FOR SECONDS COUNTING, 31 ROTOR FOR MINUTE COUNTING (as illustrated below) Upper pivot of the ROTOR 38 MINUTE WHEEL, 30 SECONDS COUNTING WHEEL and 33 SMALL SECONDS WHEEL (as illustrated below) Upper pivot of the MINUTE WHEEL Other portions 30 SECONDS COUNTING WHEEL 56 CENTER WHEEL 13/21...
- Page 14 TECHNICAL GUIDE Cal. 7T04A 47 MAIN PLATE Lubricating AO-3 AO-2 14/21...
- Page 15 TECHNICAL GUIDE Cal. 7T04A ● Gear train mechanism • Setting position and lubricating MINUTE COUNTING ROTOR FOR MINUTE COUNTING MINUTE COUNTING WHEEL INTERMEDIATE WHEEL 0902500 4146710 0950590 (white plastic) 34 THIRD WHEEL 38 MINUTE WHEEL (white plastic) 0231580 0261 580...
- Page 16 * 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 17 TECHNICAL GUIDE Cal. 7T04A [Structure of the CIRCUIT BLOCK] Input terminal (-) Input terminal (+) C=MOS=IC Output terminal Crystal unit Output terminal ● Value checking – coil resistance (coil blocks) Check the resistance of each coil block if they are within the range in the following table.
- Page 18 TECHNICAL GUIDE Cal. 7T04A l Function check Operation Function Checkpoint P u l l o u t t h e c r o w n t o t h e 2nd click and push it back in Make sure that it has a click...
- Page 19 TECHNICAL GUIDE Cal. 7T04A ● Water resistance test Check the water resistance according to the designated specification of the watch. Marking on the case back Water resistance test Applied pressure WATER RESISTANT (WATER RESIST) Air overpressure test 3 BAR WATER RESIST 5 BAR 5 BAR Wa t e r o v e r p r e s s u r e WATER RESIST 10 BAR 10 BAR test and condensation WATER RESIST 15 BAR...
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Page 20: Troubleshooting
TECHNICAL GUIDE Cal. 7T04A TROUBLESHOOTING Symptom Possible causes Solutions Measure the bat ter y voltage. Movement The watch stops operat- The battery has been depleted. Replace the battery with a new ing. one. The hour wheel and the pinion of Check the relevant par ts, and the minute wheel are not prop- replace the damaged parts with erly engaged. (Or the teeth of the... - Page 21 TECHNICAL GUIDE Cal. 7T04A Symptom Possible causes Solutions Measure the coil block resist- STOPWATCH O n e o r m o r e S T O P - The relevant coil is broken. ance. Replace the coil with a new W A T C H h a n d s h a v e one if necessary.