HEUER Chronosplit Repair and Modules

On this page I discuss faults, on the next page I discuss Chronosplit GMT repairs.


The Calibre 104/107 Chronosplit like its predecessor employs the use of open wire bonds and IC technology on the top LCD module. This again exposes the module to the same problems as the calibre 102 module such as battery corrosion, short circuits, wire-bond damage & IC lift due to silver epoxy failure. On a positive note the lower analogue display generally is relatively reliable and uses a sealed IC design in both the Manhattan and Senator models.


Problems can manifest themselves as missing display segments, dead digits, erratic functionality or complete module failure.


To save space on the diminutive upper LCD display Heuer embedded a single IC between the display and the PCB, this provides some protection from external influences, however if the battery leak there is a very high chance of failure.


Great caution has to be exercised when removing the display as it is very easy to damage the wire bonds beneath. Please see Fig.1


Another problem with the Manhattan is LCD failure, LCD failure is normally recognisable as black "bleed" marks or the display going completely black. I currently do not stock spare displays but may investigate coming up with an alternative in the future if I encounter enough interest.


The bottom analogue Citizen/ESA display is generally reliable and when it does fail it can sometimes be repaired by careful disassembly and cleaning.


Fig. 1 - Upper Heuer Cal 107 LCD display module with LCD display removed.

Fig. 2 - Upper Heuer Cal 107 LCD display module rear view.

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