Cell Life And Replacement - Sharp CE-159 Service Manual

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When the CE·159 is used as a RAM area, the reserve area can be secured inside the mod·
ule, as illustrated. (The reserve area inside the PC· 1500 can be cleared.) The BASIC
program is written from the CE· 159, while variables are secured from the PC· 1500.
With the CE· 159 connected to the PC· 1500, the total memory capacity becomes 10 K
bytes including the reserve area.
When U$Cd as a RAM area, this rnemory capacity makes it possible to write a program,
secure variables, char\ge and write the reserve contents.
When an e:xclusive readout area is set, writing or program change in this area becomes im·
possible. T herefore, only the remaining RAM area can be used as variable$. (The reserve
atea can also
be
made for exclusive use in readouts. making writing o r program change
impossible.
t
5. CELL LIFE AND REPLACEMENT
Cell life
The life of a lithium cell in the CE· 159 is about 5 years at normal temperature (25°C)
when the CE· 159 is connected to the computer, Md about 2 years when disconnected
from the computer. The contents of the CE· t 59 can be therefore retained for these
periods of time, respectively.
The CE· 159 is provided with the following data label:
182 0 90 1
I
. , . , , , . . --
.- -
.....
,
Year Month Dav
!191!11
This data indicates the day when the lit hium cell is placed in the CE.·159. The cell
life in the CE-159 is about 5 years or 2 years according t o this date under normal tem·
perature (25°C}. However. it may be shortened depending on an operating environment
where the temperature is too high or too low. causing the program in the exclusiYe read·
out area to disappear. To prevent this,
it
is recornmended that you record the program
or data
Or'1
tape for storage.
When battery power declines, the following will occur:
(1} Program execution is not pos.siblc.
(2) lncorrrect displays are indicated .
(3) Errors take place.
For trouble-free operation, replace the cell at your nearest Sharp service stations.
Caution should be taken if there is a lapse of more than 5 years from the date on the
cell label or the
cell is
already cxperded. If installed in the CE·
159,
it c;ould cause bat·
terv leakage, resulting in damage to the unit.
3
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