1. Open the case by removing the four screws on the back of
the calculator (you may need to remove the rubber which
covers the wholes)
2. Contact the minus whire with the third copper contact
from the left and the plus wire with the 11th copper
contact on the main board of the calculator by using the
scotch.
Remark:
The main board of the calculator has 21 copper contacts.
The third from the left is the minus contact, the 11
th
is the
plus contact. Other contacts are used for connecting
additional modules.
(see picture to the right)
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