Panasonic CF-48 Service Manual page 20

4.4.4 KEYBOARD, MOUSE or TOUCH PAD 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 Touch pad not function.
Input from the track ball
are not accepted properly.
6 Keyboard failure
7 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?
Replace the touch pad.
5-1 Does operation return to
normal?
Replace the touch pad FPC.
5-2 Does operation return to
normal?
Is the keyboard properly
6-1
connected?
Replace the keyboard.
7-1 Does operation return to
normal?
4 - 8
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 Touch Pad
NO Go to No. 5-2
YES Touch Pad FPC
NO Main PCB
YES Go to No. 7
Keyboard was
NO not connected
properly
YES Keyboard
NO Main PCB
Component
IC26
IC26
IC26
IC26