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OMEGA SA  

WORLD SERVICE ORGANIZATION  

GT-19-C-013-E - C - 1538

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General information for calibre 1538 

Seconds wheel

Version 1538A

Version 1538B

Former execution

New execution 

7221441227

7221538B30027*

 

Improve the accuracy of

the seconds hand jump.

Ref. 7221538B300273

New version from date code: 47/04

Wheel train bridge

Version 1538A

Version 1538B

Former execution

New execution 

7221538B1004807

7221538B1004807

A magnet to stabilise the

seconds wheel has been added.

New version from date code: 10/04

Improvement of the seconds jumps on calibre 1538D 

In order to better meet our customers requirements, the jump 

of the seconds hand on calibre 1538D has been further 

improved.

Technical modi

fi

 cations on version

 «D» 

Calibre 1538D

Application :

When repairing a version D, the new components must be 

used systematically.

When ordering one of the two components individually, an 

automated order of KIT ref. 7221530D9999* is issued. 

It comprises:

Seconds wheel ref.  7221530D30027*

Intermediate wheel ref.  7221530D30012

Goal of the technical modi

fi

 cation:

Further improve the accuracy of the seconds hand jump in 

relation to the dial markers, including a reduction of the 

wheel engagement play.

Interchangeability

New and old wheel executions must not be mixed; there is a 

serious risk of blocking

.

Calibre version 1538C was produced with old and new 

wheel executions.  We therefore suggest to systematically 

using new wheels from the KIT ref. 7221530D9999*.

Version D

Kit Ref. 7221530D9999*

New seconds wheel (yellow) and 

intermediate wheel (grey).

Reduction of the play of the wheel engagement 

to improve seconds hand jump.

New version from date code: 42/07

The policy for local repair is:

We recommend a movement exchange (see Working 

Instruction no. 31). 

In case of local repair, the exchange or replacement of 

spare parts must be made according to the movement 

version (see engraving on main plate).  Example: On a 

movement calibre 1538B, the parts to exchange or repla-
ce are those mentioned under version 1538B. 

Technical modi

fi

 cations on version «B»

Calibre 1538A + 1538B 

Application :

When repairing a version A or B, the new components 

must be used systematically.

Goal of the technical modi

fi

 cations: 

Improve the accuracy of the seconds hand jump in relation 

to the dial markers.

Version A / B / C

Ref. 722143030012

Ref. 7221538B30027*

 Old seconds wheel (grey) and 

intermediate wheel (yellow)

Summary of Contents for 1538

Page 1: ...nd display hours and minutes and seconds date Time zone Stepper servo motor sixty impulses per minute inhibition EOL Technical Guide TG 19 C 013 E C Prod by pelrom Date 24 10 2008 3 Modifications see...

Page 2: ...odifications on version D 3 Information on the battery Movement exchange is recommended Tools 4 Specific information for Calibre 1538 7 8 Hand fitting height Runners for hand setting and hand setting...

Page 3: ...seconds hand jump in relation to the dial markers including a reduction of the wheel engagement play Interchangeability New and old wheel executions must not be mixed there is a serious risk of blocki...

Page 4: ...ic tweezers 502 310 0051 Major points Information on the battery The used battery depends always on the case reference Ref 1449936 1 55 V Low Drain 9 50 mm H 1 60 mm Renata 373 Vartachron V373 UCAR En...

Page 5: ...E C 1538 5 Differences between version 1538A 1538B 1538C and 1538D H3C AH6 AH6 H3D AH6 H3D AH6 RoHS version Calibre 1538C 1538D H3C H 3 S F 5 H 3 S F 5 Non RoHS version Calibre 1538A 1538B Difference...

Page 6: ...Version Reference 1538A 72215381010600 30 027 30 012 Kit 7221530D9999 1538A 1538B 1538B 1538C 1538C 1538D 1538D 7221530D9999 Battery insulator Version Reference 1538A 72214302065100 1538B 1538C 1538D...

Page 7: ...height H3 and version D H3D Specific information for calibre 1538 Fig 1 0 Description Movement holder for hand setting No of runners for hand setting Minimum force N Maximum force N Support jewel Hou...

Page 8: ...Movement consumption Measured without battery external supply 1 55 V Jump of four steps every four seconds until supply voltage 1 30 V EOL Consumption higher than normal Measurement without battery w...

Page 9: ...y pelrom Date of second edition 22 01 2008 Version B rendav Date of last edition 24 10 2008 Version C Modifications of Technical Guide version B Old version A New version B Additional Kit second wheel...

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