HP HP-41 C Montageanleitung

HP-41 C repair guide

A simple instruction to get a HP 41C working when battery contact strip is broken.

Requirements:

A small size screw driver

Aluminium for connecting the batteries

Two wires for minus / plus connectors

Cohesive scotch

The HP 41C calculator not working anymore

The broken strip (battery corrosion).

This strip can still be used to connect external modules !

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 11th is the

plus contact. Other contacts are used for connecting

additional modules.

(see picture to the right)

3. Connect the minus contact to the right–most battery by

using the aluminum.

4. Connect the plus contact to the left-most battery by using

the aluminium.

5. Use aluminium to connect the second and third battery

Remark:

The connector between the both batteries in the middle

connect the four batteries in serie.

Attach the cover back with the screws

The broken connector still helps to connect the wires to the mainboard

contacts. When the back cover is attached to the calculator again, then it

presses the wires down on the mainboard contacts.

5

4

3

Press the ON button –you’re HP41C calculator is back working !

Contact:

stephang (at) bluewin.ch

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