Panasonic Toughbook CF-48 Service Manual page 17

No. Symptom
1
No power is sent to the
unit.
(when using AC)
No power is sent to the
unit, (When using the
Battery Pack)
2 Power cuts off during
operation.
No. Symptom
1
When a device is selected
for "Boot Up Drive", the
system boots from a
different device.
Troubleshooting
procedures
No.
Is 15V applied to pins 5-8 of
1-1
Q74? (Whichever one)?
Is 15V applied to pins 1 of
1-2
Q74?
Is 15V applied to pins 1 of
1-3
Q70?
Is voltage pin 4 of Q70 lower
1-4
than 1V?
Is voltage pin 4 of Q62 lower
1-5
than 1V?
Before setting the power
switch to ON, check voltage
1-6
on either side of R260. Is
Voltage 3.3V?
1-7 Final Means
Is 8~12V applied to pins 5~8
1-8
of Q62? (Whichever one)
Check soldered parts of
2-1
R389, 390, 403 and R404.
Troubleshooting
procedures
No.
Are there system files in the
1-1
device selected?
Does the unit operate
1-2 normally after replacing the
problem device.
4 - 5
Source of
problem
Result
YES Go to No. 1-6
NO Go to No. 1-2
YES Go to No. 1-5
NO Go to No. 1-3
YES Go to No. 1-4
If resistance
across L93
NO terminals is not
lower than 1
If lower than 1
YES
If voltage pin 3 of
NO D24 is 15V
If lower than 15V
YES
If voltage pin 3 of
D24 is 15V
NO
If lower than 15V
If voltage is 0V
during the power
YES
switch is set to
ON, go to No. 1-7
If not 0V
If voltage of C454
NO is 3.3V
If lower than 3V
Main PCB
YES Go to No. 1-6
NO Go to No. 1-5
If they show
NO soldered
completely
YES
Source of
problem
Result
YES Go to No. 1-2
NO Improper setting
Device for which
YES the problem
occurred
NO Main PCB
Component
L21
D26
Q70
R415
Q69
D24
Q62
Q61
D28, D29
D30, D31
SW801
R260
IC58
IC58
R389, R390
R403, R404
IC58
Component
(HDD)
IC13
(FDD/SDD)
IC13
IC23