Panasonic KX-VC300CX / KX-VC600CX Service Manual ▷ View online
89
KX-VC300CX/KX-VC600CX
8.7.
Time Failure
8.8.
Microphone Failure
Note
Please don't reuse the net.
Please change it for a new one if you remove it.
Please change it for a new one if you remove it.
Conditions
Check items
Checking points & methods
Actions
Clock gains/loses time signifi-
cantly.
(Time deviates years or hours)
cantly.
(Time deviates years or hours)
Li battery (B1271)
Clock IC (IC1207)
Clock IC (IC1207)
Measure voltage between CL1272(BAT_N) and
GND while the power is off.
Voltage of 2.9 V or more should be observed.
GND while the power is off.
Voltage of 2.9 V or more should be observed.
Replace B1271
After executing SET_RTC command, execute
GET_RTC command. The time when the com-
mand was executed should be displayed.
GET_RTC command. The time when the com-
mand was executed should be displayed.
Replace IC1207
Diode (D1271,D1272,D1273)
Check diodes with a tester. Confirm conduction
between A and K
between A and K
Replace D1271, D1272 and
D1273
D1273
Clock gains/loses time.
(Time deviates a minute every
one hour)
(Time deviates a minute every
one hour)
Crystal Oscillator (X1271)
Capacitor (C1274,C1275)
Capacitor (C1274,C1275)
Replace parts (There may be cases that detailed
analysis with a frequency counter is not avail-
able).
analysis with a frequency counter is not avail-
able).
Replace X1271
Replace C1274 and C1275
Replace C1274 and C1275
Conditions
Check items
Checking points & methods
Actions
LED illumination failure
LED(D401)
Visually check if the LED(D401) emits light in
orange when you turn on power to the KX-VC600/
VC300 connected.
(Please confirm it after connected to KX-VC600/
VC300.)
orange when you turn on power to the KX-VC600/
VC300 connected.
(Please confirm it after connected to KX-VC600/
VC300.)
Replace D401.
Mute SW failure
Switch (SW401)
Check the voltage of SW401 when the Mute SW
is pressed and not pressed.
Monitor SW401 side of R421 with a tester.
(Please confirm it after connected to KX-VC600/
VC300.)
is pressed and not pressed.
Monitor SW401 side of R421 with a tester.
(Please confirm it after connected to KX-VC600/
VC300.)
When the button is pressed
and R421 >=0.5 V, replace
SW401.
and R421 >=0.5 V, replace
SW401.
When the button is not pressed
and 2.4V >=R421, replace
SW401.
and 2.4V >=R421, replace
SW401.
Connector failure
CN403
Check conductivity visually and with a tester.
Replace CN403.
Audio does not pass through.
Refer to PNLPVCA0021Z.
Damages to nets, cabinets,
cables
cables
Check visually.
Replace nets, cabinets, and
cables.
cables.
90
KX-VC300CX/KX-VC600CX
8.9.
USB Failure
Area to check 1
C4001
C4002
C4004
C4005
C4006
C4007
C4008
C4009
D952
C4010
R10526
R10527
C4016 C4017
C4018 C4019
C4023 C4024
L1001
C4027
L1004
Z1001
Z1002
Z1003
Z1004
Z1005
Z1006
Z1007
Z1008
C4033
C3
0
Z1011
C213
C218
L1404
R4
0
L14
R4
0
C4054
C4055
C4056
Z951
Z953
Z954
Z955
Z956
Z957
Z958
Z960
Z962
Z963
Z964
IC203
IC204
L501
IC207
L503
L504
L505
CL951
CL952
CL953
CL954
C1001
C1003
C1004
C1005
C1006
C1008
C1009
C1012
C1017
C1019
R112
C1020
C1021
C1022
R501 R502
R503
R504
R508
IC1002
C1036
C1037
C1038
C1039
C1040
R1401
L951
R1019
C1041
R1402
L953
R1020
FL951
C111
C112
C113
C117
C118
R540
C504
C505
R541
R542
R543
C508
R545
C1452
R547 R548
C510
C512
C513
C514
C515
R551
R552
F1401
C910
C10510
C10511
FL1005
FL1006
CN1001
R961
R963
R966
R967
R968
D501
L4051
D502
L4052
D503
L4053
D504
D505
D506
D507 D508
C951
C952
IC103
C953
IC105
IC106
D10502
IC107
C957
D10504
C959
D10506
D10507
X951
C962
C963
C964
C965
C966
C967
C968
L2
C97
0
D
C972
C973
C974
C975
C976
C977 C978 C979
IC901
IC903
IC951
R10504
R10505
R10506
R10507
R209
5
8
4
1
5
8
4
1
7
1
14
8
1
7
8
2
14
13
12
9
102
39
103
128 1
64
38
65
5
1
6
11
15
10
CN501
1
17
4
4
1
3.0A
4
1
6
5
5
8
4
1
5
8
4
1
7
1
14
8
7
1
14
8
90
61
60
31
30
1
120
91
6
4
1
3
K
L
Oscilloscope
R963
R963
GND
GND
91
KX-VC300CX/KX-VC600CX
8.10. Power/clock Failure
8.10.1. Power
No power
Check power supply unit.
Check power supply unit.
92
KX-VC300CX/KX-VC600CX
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