Chapter 5 “Maintenance of the keyboard”
This section is provided for the maintainer of the IBM 4685-K03 POS keyboard.
Be sure to read “Safety instructions” on page and “Safety inspection guide” on page
before working on this product.
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If problems occur

This section explains how to handle problems encountered when using the IBM 4685-K03 keyboard.
Symptom Causes and actions
There is no response to
any of the keyboard keys.
Cause 1
Action 1
Cause 2
Action 2
Cause 3
Cause 3
Status of the mode key is “Inactive”.
Select a mode other than “Inactive”. See “Mode switch” on page 13 for
more information.
The setup for the operating system (OS) had problems.
Confirm the validity of the keyboard type as set up for the OS. Check
the OS documentation for more information.
The keyboard cable, the top cover assembly, or the control card for
the keyboard has problems.
Replace the keyboard cable, then the top cover assembly, and then
the control card (until the faulty part is identified).
There is no response to
one or several keyboard
keys.
Cause
Actions
The key cap, the top cover assembly or the control card has troubles.
a. Identify the disabled keys by using the diagnostic program or the
self-diagnostic test. See “Diagnostic tests” on page 20 for more
information.
b. Replace the key, the unused key cover over the non-functioning
keys, or the control card. For more about replacing keys, see
Chapter 4 “Replacing a single key” on page 13. For more about
replacing unused key covers, see “Replacing an unused key cover”
on page 18.
The mode cannot be
changed with a mode key.
Cause
Action 1
Action 2
The mode key or the control card has problems.
Check the status of the mode key switches using the diagnostic
program or the self-diagnostic test. See “Diagnostic tests” on page 20
for more information.
If the status is still unchanged by Action 1, replace the mode key or the
control card.
Chapter 5 Maintenance of the keyboard 21