Casio Secret Mode: Self-Test on fx-991ES / fx-100AU PLUS (Shift+7+ON) 🔥
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YouTubeFree Online Calculators
Casio Secret Mode: Self-Test on fx-991ES / fx-100AU PLUS (Shift+7+ON) 🔥
Unlock the hidden self-test on your Casio! In this quick guide I show how to trigger the built-in diagnostic on the fx-991ES and fx-100AU PLUS (2nd Edition) using Shift + 7 + ON—so you can verify keys, segments, and functions in seconds. What you’ll learn Exact key combo (Shift + 7 + ON) and timing What each test checks (LCD segments, keys ...
2.2K views1 month ago
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