Panasonic CF-73SCUTSBM Service Manual - Page 18

Diagnosis

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9 Diagnosis 9.1 MAIN UNIT DIAGNOSIS(1/2) Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing. No. Symptom 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. Troubleshooting Source of No. procedures Result problem 1-1 Is 15V applied to pins 1-3 of Q710? (Whichever one)? YES Go to No.1-3 NO Go to No.1-2 1-2 Is 15V applied to pins 5-8 of Q699? YES Go to No.1-3 NO Go to No.1-2 Component Q699 Before setting the power 1-3 switch to ON, check voltage on either side of SW1000 Is Voltage 3.3V? YES NO If voltage is 0V during the power switch is set to ON. If not 0V If voltage of C738 is 3.3V SW1000 R705 R706 If lower than 3V IC617 1-5 Is 8-12V applied to pins 1 of Q681? (Whichever one) Check soldered parts of 2-1 D666 ～ D668 D463 ～ D468. YES If voltage is 8-12V NO Main PCB If they show NO soldered completely YES Q681 R589 R584, R585 R501 ～R506 IC605, IC606 IC616 9.2 MAIN UNIT DIAGNOSIS(2/2) Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing. No. Symptom 1 When a device is selected for "Boot Up Drive", the system boots from a different device. 2 Date or Time cannot be input. Date and Time does not change properly. Date and Time are not displayed. Troubleshooting No. procedures 1-1 Are there system files in the device selected? Does the unit operate 1-2 normally after replacing the problem device. Result Source of problem YES Go to No.1-2 NO Improper setting Device for which YES the problem occurred NO Main PCB Component IC3 2-1 Replace the Main PCB. Main PCB IC3 X2 RTC battery 3 Memory count is too large or too small. 3-1 Replace the Main PCB. Main PCB IC4-11 IC2 15

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9
Diagnosis
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No.
Result
YES
Go to No.1-3
NO
Go to No.1-2
YES
Go to No.1-3
Q699
NO
Go to No.1-2
If voltage is 0V
during the power
switch is set to
ON.
If not 0V
SW1000
If voltage of C738
is 3.3V
R705
R706
If lower than 3V
IC617
YES
If voltage is 8-12V
NO
Main PCB
Q681
NO
If they show
soldered
completely
R589
R584, R585
R501
～
R506
YES
IC605, IC606
IC616
9
.2 MAIN UNIT DIAGNOSIS(2/2)
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No.
Result
YES
Go to No.1-2
NO
Improper setting
YES
Device for which
the problem
occurred
NO
Main PCB
IC3
2
Date or Time cannot be
input.
Date and Time does not
change properly.
Date and Time are not
displayed.
2-1
Replace the Main PCB.
Main PCB
IC3
X2
RTC battery
3
Memory count is too large
or too small.
3-1
Replace the Main PCB.
Main PCB
IC4-11
IC2
1
When a device is
selected for "Boot Up
Drive", the system boots
from a different device.
Component
1-1
Are there system files in the
device selected?
1-2
Does the unit operate
normally after replacing the
problem device.
No.
Symptom
Troubleshooting
procedures
Source of
problem
No power is sent to the
unit. (When using the
Battery Pack)
Is 8-12V applied to pins 1 of
Q681? (Whichever one)
1
Check soldered parts of
D666
～
D668
D463
～
D468.
2-1
Power cuts off during
operation.
2
No power is sent to the
unit. (When using AC)
1-2
Is 15V applied to pins 1-3 of
Q710? (Whichever one)?
YES
NO
1-5
Before setting the power
switch to ON, check voltage
on either side of SW1000 Is
Voltage 3.3V?
1-3
1-1
Is 15V applied to pins 5-8 of
Q699?
9
.1 MAIN UNIT DIAGNOSIS(1/2)
Source of
problem
Component
Troubleshooting
procedures
Symptom
No.
15