Panasonic CF-07 Series, Service Manual

Page: 28 / 117

11 Diagnosis
1. MAIN UNIT DIAGNOSIS (1/2)
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
2. MAIN UNIT DIAGNOSIS (2/2)
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. 1-4
NO Go to No. 1-2
1-1
Is 15V applied to pins 2 of
Q807? (Whichever one)?
YES Go to No. 1-4
NO Go to No. 1-3
1-2
Is 15V applied to pins 8 of
Q805?
YES Go to No. 1-4
If lower than 1 F800
NO
If resistance
across LA800
terminals is not
lower than 1
LA800 1-3
Is 15V applied to pins 2 of
Q805?
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. 1-5
Final Means
Is 8~12V applied to pins 5~8
of Q855, 856?
(Whichever one) Main PCB IC801
YES
If they show
soldered
completely
R840, R842
R854, R855
1-5
1-6
Check soldered parts of
R840, 842, 854 and R855. NO
2-1
IC801 YES
1-4
Before setting the power
switch to ON, check voltage
on either side of SW1. Is
Voltage 3.3V?
If not 0V
NO
If voltage of
C825 is 3.3V
If lower than 3V
Go to No. 1-4
IC801
NO Main PCB Q844
R854
R855
SW1
2
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 HDD, 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.
IC11 NO Main PCB
14-1