Seiko 7T42B User Manual

1
Cal. 7T32B
Cal. 7T42B
Outside diameter
(x 1.0)
[SPECIFICATIONS]
7T32B
7T42B
Cal. No.
Item
Movement
The illustrations refer to Cal. 7T32B.
ø27.6mm
24.0mm between 3 o’clock and 9 o’clock sides
ø27.0mm
24.0mm between 3 o’clock and 9 o’clock sides
Casing diameter
3.1mm (3.2mm including the battery portion)Height
Movement size
mralAhctawpotSemit niaMnoitacidni emiT
Timer (for Cal. 7T42B)
Hour, minute
and small
second hands
Minute and
1/5-second
hands
Small hour and
minute hands
Minute and second hands
(Stopwatch 1/5-second
and minute hands)
Driving system Step motor, 4 pieces
• Electronic circuit reset switch
• Train wheel setting device
• Battery life indicator (Small second hand moves at two-second intervals.)
• Date calendar
• Instant setting device for date calendar
• Stopwatch function (Up to 30 minutes in 1/5 seconds)
• Accumulated elapsed time measurement
• Split time measurement
• Timer function (Up to 60 minutes in minutes)
• Alarm function (12-hour indication system)
• Alarm test system
Additional mechanism
Monthly rate at normal temperature range: less than 15 secondsLoss/gain
NilRegulation system
Measuring gate by quartz tester
SEIKO SR927W, Maxell SR927W, SONY SR927W, EVEREADY 399
Battery life is approximately 2 years.
Voltage: 1.55V
Battery
0 jewelJewels
PARTS CATALOGUE / TECHNICAL GUIDE
Use 10-second gate.

Seiko 7T42B Specifications

General

Brand	Seiko
Model	7T42B
Category	Watch
Language	English

Summary

Parts Catalogue and Procedures

Disassembling Procedures

Step-by-step guide for taking the watch apart.

Reassembling Procedures

Step-by-step guide for putting the watch back together.

Lubricating Instructions

Details on oil types and application for watch lubrication.

Parts Catalogue Remarks

Additional notes and clarifications for specific parts in the catalogue.

Technical Guide for Watch Servicing

Circuit Block Structure and Battery Installation

Overview of the circuit block and critical steps for battery replacement.

Disassembly and Reassembly Handling

Notes on correct handling of specific components during servicing.

Component-Specific Installation Notes

Instructions for installing date dial guard, hour wheel, battery clamp, and battery.

Circuit Block Cover and Friction Spring

Procedures for circuit block cover removal, installation, and lubrication.

Train Wheel Bridge Installation

Guidance on installing the train wheel bridge and lubricating pivots.

Detailed Reassembly Steps

Order of reassembly for various parts and specific notes.

Setting Positions and Adjustments

Instructions for setting component positions and making adjustments.

Component Setting and Lubrication Details

Procedures for setting levers, wheels, and lubricating the main plate.

Value and Functionality Checks

Procedures for checking electrical values and overall watch functions.

Specific Function Checks

Detailed verification steps for stopwatch, alarm, and timer functions.