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HP -28S Manual Page 291

Advanced scientific calculator.
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2. Change the batteries, as described on page 286.
3. If steps 1 and 2 don't restore the calculator, it requires service.
See "Limited One-Year Warranty" on page 291 and "If the Cal-
culator Requires Service" on page 293.
If the display is visible, but nothing happens when you press
keys:
1. Perform a System Halt.
a.
Press and hold
I
ON
I.
b.
Press [!].
c.
Release
I
ON
I.
2. If the calculator is still unresponsive, perform a Memory Reset.
a.
Press and hold 1
ON
I.
b.
Press and hold [JE[] and [E).
c.
Release [JE[] and [E).
d.
Release
I
ON
I.
3. If steps 1 and 2 fail to restore the calculator,
it
requires service.
See "Limited One-Year Warranty" on page 291 and "If the Cal-
culator Requires Service" on page 293.
The Repeating Test
If the calculator works, but you think it's not working
properly:
1. If you have a printer, turn it on. During the test the calculator
prints numbers that are helpful if the calculator requires service.
2. Start the repeating test.
a.
Press and hold
I
ON
I.
b.
Press~.
c.
Release
I
ON
I.
290
A: Assistance, Batteries, and Service

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