Hello,
The following procedure valid for the HP 48G should work for the HP48GX.
Make the calculator perform a
Self test.
It tests the RAM and ROM. You will see various patterns on screen. Afterwards you should see
IROM OK,
IRAM OK,
HP48GX OK
The self test will continue repeatedly until you perform a
System Halt
The empty stack should appear.
If you do not see IROM OK and IRAM OK, the calculator requires service.
If the above procedure is successful, you may want
to test the keyboard.
To exit the keyboard test proceed as described above under System Halt.
If you follow the proper sequence and a hexadecimal number appears after pressing a key, the calculator requires service.
Hope it helps.
If calculator requires repairs,
There is an HP customer self repair (CSR) which you can
contact. On the site it is said that the service is available for
products under warranty or on contract. but you have nothing to lose by
contacting them. Here is the link to the web site.
- You can also try this site. They do repairs on most models, except the newer ones.
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