HP-19C key trouble

[laget]

Each time a number is entered, the led return something like 0.00000000 The Item looks perfectly clean and almost unused. Somebody knows the test I could do in order to fix and solve the problem ? Many thanks

[David Smith]

A display of 000000000 (usually without a decimal point) in a Spice series machine is almost always caused by a bad ACT chip. This is the big chip on the circuit board. The only source of a replacement is another Spice series machine (21/25/25C/67/91/92/97). Different machines have different part numbers on the chip, but they all seem compatible. The HP27 chip is NOT compatible.

[laget]

Many thanks I'll try to replace the chip, and tell you if it works