Panasonic Toughbook CF-48 Series, Service Manual

Page: 18 / 107

4 - 6
Component
Source of
problem
No. Symptom
Troubleshooting
procedures
No. Result
Main PCB
IC13
X2
RTC battery
2
2-1 Replace the Main PCB.
Date or Time cannot be
input.
Date and Time does not
change properly.
Date and Time are not
displayed.
Main PCB
IC5 12
IC3
3
3-1 Replace the Main PCB.
Memory count is too large
or too small.
YES
NO
Software setting
Go to No. 4-2
YES
NO
Speakers
Go to No. 4-3
4
4-1
4-2
Check software setting.
Replace the Speakers.
Does operation return to
normal?
Main PCB
IC30
IC33
4-3 Replace the Main PCB.
No Sound
Volume does not work.
12
NO
11
Configuration Check configuration. 5-1
5 Default configuration in
use
Main PCB IC13 6-1
6 Interrupt controller failure
Main PCB 7-1 7 Timer failure
Go to No. 8-2 Does the system return to
normal if the expansion card
is removed? YES
Main PCB NO
IC13
IC3
8-1
8 Expansion card RAM
checksum error
Expansion card
Replace the expansion card.
Does operation return to
normal?
YES
Main PCB NO
8-2
Main PCB IC13 9-1
9 Real Time Clock failure
Error during
SETUP
Battery
Main PCB
Does resetting through
SETUP correct the problem?
Replace the battery.
Does operation return to
normal?
YES
YES
NO
RTC battery
IC13
10-1
10-2
10 Dead RTC Battery
Go to No. 10-2 NO
Configuration Check configuration. 11-1 Configuration error
Go to No. 12-2 Were the correct settings
selected during SETUP? YES
Go to No. 12-4
12-1
CMOS Checksum error
FDD
Replace the FDD.
Does operation return to
normal?
YES
Go to No. 12-3 NO
12-2
HDD
Replace the HDD.
Does operation return to
normal?
YES
Go to No. 12-4 NO
12-3
Error during
SETUP
Does resetting through
SETUP correct the problem?
YES
Main PCB NO
IC13
X2
12-4