hp28s need repair ?. Autotest fails

[Rafa]

Hi everyone,

i just bought an hp 28s and ran the thorough selftest and the repeating test.

- when Keyboard test begins, i get a "1 Fail" at pressing the first key, which is the letter A.
- the repeating test displays "28s ok".

All keys on both sides of the keypad as well as the shifted functions are working fine.

can someone help me figure out what the 1 Fail or Fail 1 means?

many thanks.