Read Panasonic CF-28 Service Manual online
Component
Source of
problem
No.
Symptom
Troubleshooting
procedures
No.
Result
YES
NO
Software setting
Go to No. 4-2
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?
Does operation return to
normal?
Main PCB
IC50
IC51
IC51
4-3
Replace the Main PCB.
No Sound
Volume does not work.
Volume does not work.
12
NO
11
Configuration
Check configuration.
5-1
5
Default configuration in
use
use
Main PCB
IC43
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?
normal if the expansion card
is removed?
YES
Main PCB
NO
IC43
IC33
IC33
8-1
8
Expansion card ROM
checksum error
checksum error
Expansion card
Replace the expansion card.
Does operation return to
normal?
Does operation return to
normal?
YES
Main PCB
NO
8-2
Main PCB
IC43
9-1
9
Real Time Clock failure
Error during
SETUP
SETUP
Battery
Main PCB
Does resetting through
SETUP correct the problem?
SETUP correct the problem?
Replace the battery.
Does operation return to
normal?
Does operation return to
normal?
YES
YES
NO
RTC battery
IC43
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?
selected during SETUP?
YES
Go to No. 12-4
12-1
CMOS Checksum error
FDD
Replace the FDD.
Does operation return to
normal?
Does operation return to
normal?
YES
Go to No. 12-3
NO
12-2
HDD
Replace the HDD.
Does operation return to
normal?
Does operation return to
normal?
YES
Go to No. 12-4
NO
12-3
Error during
SETUP
SETUP
Does resetting through
SETUP correct the problem?
SETUP correct the problem?
YES
Main PCB
NO
IC43
X2
12-4
15
PCI failur
Go to No. 15-2
Does the system return to
normal if the expansion card
is removed?
normal if the expansion card
is removed?
YES
Main PCB
NO
15-1
Expansion card
Replace the expansion card.
Does operation return to
normal?
Does operation return to
normal?
YES
Main PCB
NO
15-2
13
Does resetting the date/time
in SETUP correct the
problem?
in SETUP correct the
problem?
13-1
Real time Clock is not
updating
updating
Error during
SETUP
SETUP
YES
Main PCB
NO
14
Replace the expansion RAM
card.
Does operation return to
normal? (Go to “NO” if not
connected.)
card.
Does operation return to
normal? (Go to “NO” if not
connected.)
14-1
Memory size/data error
Expansion RAM
card
card
YES
Main PCB
NO
IC43
IC33
IC33
IC33
IC35~IC41
IC80~IC83
IC80~IC83
4 - 6
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