Seiko 5M43A - User Manual

1
Movement size
The illustrations refer to Cal. 5M42A.
(x 1.0)
Movement
Item
[SPECIFICATIONS]
Cal. 5M42A
Cal. 5M43A
PARTS CATALOGUE / TECHNICAL GUIDE
4.3 mmHeight
Casing diameter ø27.0 mm
Capacitor voltage: 0.5 ~ 2.3V
From 1.55V to stoppage: Approx. 168 hours
Cal. No.
5M42A
5M43A
Outside diameter ø27.6 mm
3 hands
Time indication
Step motor (Load compensated driving pulse type)
Driving system
Monthly rate at normal temperature range: less than 15 seconds
Loss/gain
NilRegulation system
Use 10-second gate.
Measuring gate by quartz tester
Automatic generating systemPower generator
Polyacene lithium condenserCapacitor
Power supply
Operating voltage range
Duration of charge
6 jewelsJewels
• Automatic generating system
• Power reserve indicator
• Overcharge prevention function
• Electronic circuit reset switch
• Train wheel setting device
• Date calendar
• Day calendar (for Cal. 5M43A only)
• Instant setting device for date calendar
• Instant setting device for day calendar (for Cal. 5M43A only)
Additional mechanism

Summary

Watch Specifications

Technical Guide - Circuit Block

Circuit Block Structure

Technical Guide - Disassembly & Reassembly

Technical Guide - Adjustments and Checks

Electrical Value Checks

Covers coil block resistance, generating coil block resistance, and current consumption.

Technical Guide - Current Consumption Measurement

Measuring Whole Movement Current

Procedure for measuring current consumption of the entire watch movement.

Measuring Circuit Block Current

Procedure for measuring current consumption of the circuit block alone.

Automatic Generating System Check

Method for checking the functionality of the automatic generating system.

Technical Guide - Recharging and Power Reserve

Recharging Procedure

Recharging Information and Power Reserve

Details on swings needed for charge, duration, and power reserve indication.

Seiko 5M43A Specifications

General

Brand	Seiko
Model	5M43A
Category	Watch
Language	English