Zenith El Primero User Manual

N° 16
ZENICH
El Primero
CAL 400
ZENICH
SERVICE

Zenith El Primero Specifications

General

Brand	Zenith
Model	El Primero
Category	Watch
Language	English

Summary

I. Main Features

II. Technical Characteristics

1. Automatic Calendar Movement

Details the automatic calendar movement's components: motor, escapement, and regulating units.

D) Winding Stem Automatic Fastening

Instructions for removing the automatic winding stem, detailing the detent axle procedure.

E) 3 Positions Crown

Explanation of the watch crown's three positions for manual winding, time setting, and date correction.

F) Instantaneous Jump Calendar Mechanism

Details the instantaneous date change mechanism, avoiding gradual shifts.

G) Automatic Winding Mechanism

Explains the automatic winding system, including the oscillating weight and reduction gear.

Chapter 2: Chronograph Mechanism

D) The Adjustable Hammer of the Chronograph

III. Instructions for Servicing

Motor Organ

Details the mainspring's maintenance, stating it needs no servicing and should not be dismantled.

Cleaning

IV. Dismantling

VIII. How to Detect Quickly the Cause of a Functional Defect of the Chronograph Mechanism

Detecting the Stopping

Procedure to locate stopping issues by checking clutch wheel engagement and disengagement.

Stopping due to the Chronograph Mechanism

Troubleshooting stopping issues related to the chronograph's minute recording jumper and hands.

Bad Position of the Hands

Hour Recorder