User manual

7
Until early 2015, we installed a soldered-in cylindrical lithium battery in order to keep the
memory alive for at least ten years. Since then, due to restrictions on lithium batteries in air-
freight, with Version 4.2B and later, we use one of two arrangements – Options B and C –
both of which involve a larger capacitor to retain the memory data for longer, in the absence
of C-cell batteries and external power, and an under-voltage shutdown arrangement to
ensure the C-cell batteries cannot be completely discharged if the machine is accidentally
left running from them for an excessive time.
Option B involves an internal holder for a 2032 coin cell (20mm x 3.2mm thick "button cell)
lithium battery, without any battery installed or supplied. We can ship the machine overseas
like this, without C-cell batteries and the capacitor will generally retain memory data during
the four days to two weeks it takes to be delivered to you, the customer. You can then install
a 2032 battery in this holder, if you want to open the machine, or get a technician to do so.
The lithium battery is not required, since you can safely retain data by installing alkaline C-
cell batteries in the main battery compartment. The optional lithium battery, if installed,
ensures data retention for 10 years or more even if no C-cells are installed.
Option C is only for machines we ship to Australian customers. It is the same as just
described for option B, but we install a 2032 battery in the internal holder.