Panasonic Toughbook CF-28 Service Manual page 18

No. Symptom
4 No Sound
Volume does not work.
5 Default configuration in
use
6 Interrupt controller failure
7 Timer failure
8 Expansion card ROM
checksum error
9 Real Time Clock failure
10 Dead RTC Battery
11 Configuration error
12 CMOS Checksum error
13 Real time Clock is not
updating
14 Memory size/data error
15 PCI failur
Troubleshooting
procedures
No.
4-1 Check software setting.
Replace the Speakers.
4-2 Does operation return to
normal?
4-3 Replace the Main PCB.
5-1 Check configuration.
6-1
7-1
Does the system return to
8-1 normal if the expansion card
is removed?
Replace the expansion card.
8-2 Does operation return to
normal?
9-1
Does resetting through
10-1
SETUP correct the problem?
Replace the battery.
10-2 Does operation return to
normal?
11-1 Check configuration.
Were the correct settings
12-1
selected during SETUP?
Replace the FDD.
12-2 Does operation return to
normal?
Replace the HDD.
12-3 Does operation return to
normal?
Does resetting through
12-4
SETUP correct the problem?
Does resetting the date/time
13-1 in SETUP correct
problem?
Replace the expansion RAM
card.
14-1 Does operation return to
normal? (Go to "NO" if not
connected.)
Does the system return to
15-1 normal if the expansion card
is removed?
Replace the expansion card.
15-2 Does operation return to
normal?
4 - 6
Source of
problem
Result
YES Software setting
NO Go to No. 4-2
YES Speakers
NO Go to No. 4-3
Main PCB
Configuration
Main PCB
Main PCB
YES Go to No. 8-2
NO Main PCB
YES Expansion card
NO Main PCB
Main PCB
Error during
YES
SETUP
NO Go to No. 10-2
YES Battery
NO Main PCB
Configuration
YES Go to No. 12-2
NO Go to No. 12-4
YES FDD
NO Go to No. 12-3
YES HDD
NO Go to No. 12-4
Error during
YES
SETUP
NO Main PCB
Error during
YES
the SETUP
NO Main PCB
Expansion RAM
YES
card
NO Main PCB
YES Go to No. 15-2
NO Main PCB
YES Expansion card
NO Main PCB
Component
IC50
IC51
IC43
IC43
IC33
IC43
RTC battery
IC43
IC43
X2
IC43
IC33
IC35~IC41
IC80~IC83
IC33
IC33