Panasonic Toughbook CF-48 Series, Service Manual

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