Panasonic CF-07 Service Manual page 32

4. KEYBOARD, MOUSE DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No. Symptom
1
Key top cannot be
pressed.
Key top does not spring
back after pressing.
2 None of the keys function.
Certain keys do not
function.
3 Input character is
displayed as grabage.
4
Mouse does not function.
Inputs from the mouse are
not accepted properly.
5 Keyboard failure
6 Keyboard interface failure
Troubleshooting
procedures
No.
1-1 Keyboard is broken.
Replace the keyboard and
2-1 see if inputting from the
keyboard function normally?
3-1
Does the screen mode
correspond to the key entry
mode?
Is the keyboard setting in the
3-2
operating system correct?
Replace the keyboard and
3-3 see if inputting from the
keyboard functions normally.
Replace the mouse.
4-1 Does operation return to
normal?
Is the keyboard properly
5-1
connected?
Replace the keyboard.
6-1 Does operation return to
normal?
14-5
Source of
problem
Result
Keyboard
YES Keyboard
NO Main PCB
YES Go to No. 3-2
Operating
NO
mistake
YES Go to No. 3-3
NO Software setting
YES Keyboard
NO Main PCB
YES Mouse
NO Main PCB
YES Go to No. 6
Keyboard was
NO not connected
properly
YES Keyboard
NO Main PCB
Component
IC20
IC20
IC20