How to Perform a Diagnostic Test on an HP-48GX Scientific Calculator

Reduce Your HP-48gx Troubleshooting Time with a Simple Diagnostic Test

Nina Nixon
Nina Nixon, Yahoo! Contributor Network
Apr 14, 2011 "Share your voice on Yahoo! websites. Start Here."
The HP-48gx streamlines statistical analysis and scientific calculations. However, when a feature goes awry, computing intricate computations by hand might lead you to second guess the accuracy of the answers. Before resorting to manual calculations, perform a diagnostic self-test on your HP 48gx. When finished, you will quickly be able to determine if you should to take it in for service.

1. Press the "ON" key and hold it down.

2. Press the "E" key and then release it.

3. Release the "ON" key and then wait until the messages "IROM OK," "IRAM OK," and "OK-48" have each displayed once during the test.

4. Press the "ON" key and hold it down.

5. Press the "C" key and then release both the "ON" key and the "C" key at the same time. (This step combined with step 4 will end the diagnostic test.)

6. Contact HP Support for service if any one of the following messages, "IROM OK," "IRAM OK" and "OK-48," as indicated in Step 3 did not appear during the test or your calculator still does not work.

Source:

HP Support: HP 48g Series Calculators: Hardware Troubleshooting

Published by Nina Nixon

Nina Nixon has been writing for more than 24 years. She has written hundreds of articles covering topics about business, technology, gardening and home improvement. Nixon is certified with the City of Columb...  View profile

  • To pass, "IROM," "IRAM," and "OK-48" must all be displayed during the diagnostic test.
Running a diagnostic test is one of the fastest ways to determine what ails your HP-48 calculator, which in turn, could lead to a faster and more accurate repair.

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