Determining if the Calculator Requires Service

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The calculator won’t turn on (nothing is in the display):

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Resetting the calculator

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Erasing the calculator’s memory

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The calculator doesn’t respond to keystrokes (nothing happens when you press the keys):

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A: Assistance, Batteries, and Service 121

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HP F1902-90001 Determining if the Calculator Requires Service, QvwdooQhzEdwwhulhv,  HudvhWkhPhpru\VhhEhorz