HP 21 Woodstock Missing Decimal Point

[Harald]

(01-06-2016 02:17 AM)Sanjeev Visvanatha Wrote:  Hello,

I have a HP-21 that is not displaying the left-most decimal point. All other digits and decimals appear to be working correctly.

Could I get your thoughts on whether this is repairable? I have not opened a Woodstock before.

Thank you.

This could be either a contact problem or display problem.

Disasembling a woodstock is very simple:
- Remove the battery pack
- Pull out the two rubber feet under the display
- Remove the two screws under the feet
- Slightly push the PCB upward at the battery terminals, the keyboard should lift slightly so you can grab it at the display end
- Pull the keyboard away towards the top of the calculator, lifting it just enough to clear the back case
- Now you should have disassemble the calculator

Have a look at the contacts between the LED Display and the main board. Unpluge the display and plug it back in. If it was a connection problem, it might be working again. If not, do you have a Multimeter with diode tester? That is perfect to check if all display segments work.