HP 35s User Manual page 292

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 
6
→

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 
→ →
 
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 
If you press the keys in the proper order and they are functioning properly,
the calculator displays  followed by two–digit numbers. (The
calculator is counting the keys using hexadecimal base.)
If you press a key out of order, or if a key isn't functioning properly, the
next keystroke displays a fail message (see step 4).
4. The self–test produces one of these two results:
The calculator displays  if it passed the self–test. Go to step 5.
The calculator displays  followed by a one–digit number, if it
failed the self–test. If you received the message because you pressed a key
out of order, reset the calculator (hold down
self test again. If you pressed the keys in order, but got this message,
repeat the self–test to verify the results. If the calculator fails again, it
requires service (see page A–8). Include a copy of the fail message with
the calculator when you ship it for service.
5. To exit the self–test, reset the calculator (hold down

Pressing and
You can halt this factory test by pressing any key.
A-6
Support, Batteries, and Service
9
→ →

→ →
Ø 
4
→ → →

→ →
  
9
starts a continuous self–test that is used at the factory.
→ →
×
→ →
 
→ →
  
→ → →
  
→ →
Ö Õ 
→ →
 
→ → →
 
→ → →
 
 
, press

and press
→ →

→ →

→ →
 
→ →
 
) and do the

).