Seiko 7T04A User Manual

PARTS CATALOGUE / TECHNICAL GUIDE
Cal. 7T04A
[SPECIFICATIONS]
Cal. No.
Item
Interval of hands movement
Driving system
Additional function
Loss/gain
Regulation system
Gate time for rate measurement
Power
supply
Battery No.
Battery voltage
Battery life
Number of jewels
1/21
Crown
operation
Normal position
1st click position
2nd click position
Current consumption
Coil resistance
1 second
0 jewel
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
4002700 (COIL BLOCK and COIL BLOCK FOR SECONDS COUNTING)
2.10 - 2.70 K
Ω
Use 10-second gate.
SEIKO SR927SW
Nil
1.55 V
Approx. 5 years
7T04A
• 3 hands (hour, minute,
and small second
hand)
• 24-hour indicator
• Big date indicator
4002711 (COIL BLOCK FOR MINUTE COUNTING)
1.80 - 2.40 K
Ω
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)
• Diameter
Outside: Ø 27.6 mm Casing: Ø 27.0 mm
• Height: 4.93 mm
Movement: Less than 1.10 μA
Circuit block: Less than 0.20 μA

Seiko 7T04A Specifications

General

Movement Type	Quartz
Caliber	7T04A
Display	Analog
Case Material	Stainless Steel
Functions	Chronograph, Date

Summary

SPECIFICATIONS OVERVIEW

FEATURES OVERVIEW

Details the watch's multi-display and stopwatch functionality.

STOPWATCH FUNCTION DETAILS

Covers measurement performance and button operations for the stopwatch.

MEASUREMENT FUNCTIONS

Explains accumulated elapsed time and split time measurement functions.

PROCEDURE AFTER BATTERY CHANGE

Provides step-by-step instructions for setting hands after battery replacement.

PARTS LIST AND IDENTIFICATION

SETTING STEM REMOVAL REMARKS

Guidance on removing the setting stem during disassembly.

24 HOUR INDICATOR MECHANISM

Illustrates the parts and assembly of the 24-hour indicator mechanism.

PART IDENTIFICATION AND SELECTION GUIDELINES

Advice on selecting parts and differentiating similar components.

TECHNICAL GUIDE AND PROCEDURES

MOVEMENT DISASSEMBLY AND REASSEMBLY

General remarks and specific steps for disassembling and reassembling the movement.

SETTING STEM REMOVAL AND MECHANISM

Procedure for setting stem removal and lubricating setting mechanism parts.

GEAR TRAIN MECHANISM LUBRICATION

Instructions for lubricating upper pivots of various gear train components.

INSPECTION AND MEASUREMENT PROCEDURES

Procedures for measuring current consumption of the whole movement and circuit block.

COIL RESISTANCE VALUE CHECKING

Guide for checking the resistance values of different coil blocks.

FUNCTIONAL CHECKS OF MECHANISMS

Steps to verify the proper functioning of various watch mechanisms and hands.

WATER RESISTANCE AND ACCURACY TESTS

Guidelines for water resistance testing and accuracy verification.

TROUBLESHOOTING GUIDE

WATCH MOVEMENT STOPPED ISSUES

Troubleshooting steps for a watch that has stopped operating.

HIGH CURRENT CONSUMPTION DIAGNOSIS

Diagnosing and resolving high current consumption for movement and circuit block.

STOPWATCH HAND MOVEMENT PROBLEMS

Troubleshooting issues with stopwatch hand movement or operation.

EXTERNAL PARTS ISSUES (CROWN FALL)

Addressing the issue of the crown falling off the watch.