Panasonic KX-NT680RU-B Service Manual ▷ View online
25
KX-NT680 Series
8.2.2.
Attaching MAC Address Label
Attach the new MAC address label to the unit by placing over the old label.
Attach the new label
NEW MAC Address Label
26
KX-NT680 Series
9 Troubleshooting Guide
9.1.
No Operation
9.1.1.
Power ON Error
9.1.2.
Power Supply : AC adaptor
Yes
No
No
Yes
Related parts:
CN6001, LCD module
See 9.2 Color LCD Does Not Operate. (P.31)
Related parts: Power supply
See 9.1.2 AC Adaptor (P.26) or
See 9.1.3. PoE (P.27)
See 9.1.2 AC Adaptor (P.26) or
See 9.1.3. PoE (P.27)
Confirm the LCD Display.
Is it working?
Is it working?
When input any POWER(AC adaptor or PoE).
Does RINGER-LED (GREEN) light?
Does RINGER-LED (GREEN) light?
END
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Yes
No
Related parts: F3001,LF3001,C3070,C3069,D3005,
D3002,JK3001
Confirm DC Jack assembly.
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Measure the voltage at TP:+12V.
Is it about 12V?
Is it about 12V?
GO TO A
*Please refer to 10.4 Assembly for Lead wire.
27
KX-NT680 Series
9.1.3.
Power Supply : PoE
Note:
Refer to waveform (1) in Waveform (P.53) .
Yes
No
No
No
Yes
Related parts: D2003,R2046,C2064,C2063,
R2045,R2043,R2040,C2058
Related parts: C2051,C2052,C2050,C2049,
C2048,D2002,Q2002,R2033,
R2034,R2032,R2030,C2047
R2034,R2032,R2030,C2047
Related parts: JK2002,T2002,R2047,R2046,
L2009,L2010,L2011,L2012
Confirm the waveform of PoE Switching Regulator
SIGNAL at Pin(Gate) of Q2002.
See the communication waveform(1)*.
SIGNAL at Pin(Gate) of Q2002.
See the communication waveform(1)*.
No
Yes
Related parts: R2027,Q2001,R2028,R2029,
L2008,C2043,C2042,C2041,
C2040,R2026,C2039
C2040,R2026,C2039
Measure the voltage at TP:PoE_DC.
Is it about 10.6V?
Is it about 10.6V?
Measure the voltage between Pin6 and Pin7 of
IC2002.
Is it between 44V to 57V? (typ 48V)
IC2002.
Is it between 44V to 57V? (typ 48V)
Measure the voltage between TP:
(PoE-AP, PoE-AN) or (PoE-BP, PoE-BN).
Is it between 44V to 57V? (typ 48V)
(PoE-AP, PoE-AN) or (PoE-BP, PoE-BN).
Is it between 44V to 57V? (typ 48V)
GO TO A
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
28
KX-NT680 Series
Note:
Refer to waveform (2),(3),(4) in Waveform (P.53) .
No
Yes
No
Confirm the waveform of reset signal at
TP PWR_RST.
See the communication waveform (2)*.
TP PWR_RST.
See the communication waveform (2)*.
Yes
Related parts: IC4001,C4040,C4041,R4025,C4056,
R3018,R3019
Measure the frequency of clock signal at
No
Pin 1 of X1001. Is it 25MHz?
See the communication waveform (3)*.
See the communication waveform (3)*.
Yes
Related parts: X1001,C1040,C1041,R1047,R1050
Measure the frequency of clock signal at
No
Pin 1 of X1002. Is it 25MHz?
See the communication waveform (4)*.
See the communication waveform (4)*.
Yes
Related parts: X1002,C1042,C1043,R1049,R1053
Measure the voltage at TP:+5.0V.
Is it 5.0V?
Is it 5.0V?
A
No
Confirm Flash and DDR memory data.
END
*
1
Each IC1002 has its own MAC address.
When replacing the PCB , remove the former
MAC address label from the bottom of the unit
and affix the included label which indicates the
new MAC address.
When replacing the PCB , remove the former
MAC address label from the bottom of the unit
and affix the included label which indicates the
new MAC address.
Related parts: See Table-1 (P.29) and
Table-2 (P.30).
Table-2 (P.30).
No
Confirm the LCD display.
Is it working?
Is it working?
Yes
Related parts:
See 9.2.1 Color LCD Not Operate.
Yes
CN6001, LCD module,
L6001,C6005,C6006,C6010-C6014,
C6017-C6022,C6026-C6034,
RA1005-RA1008,R1100-R1102,R1117,
R1118,R1121,R1112,R1122-R1124,
R1131,R1132,R1116,L1003
L6001,C6005,C6006,C6010-C6014,
C6017-C6022,C6026-C6034,
RA1005-RA1008,R1100-R1102,R1117,
R1118,R1121,R1112,R1122-R1124,
R1131,R1132,R1116,L1003
No
Yes
Measure the voltage at TP:+3.3V.
Is it 3.3V?
Is it 3.3V?
Related parts: C3035,C3034,R3025,C3032,R3024,
C3036,IC3004,C3029,L3004,R3015,
R3016,C3024,C3025,C3037,C3038,
R3031,C3030,C3026,C3021
R3016,C3024,C3025,C3037,C3038,
R3031,C3030,C3026,C3021
Related parts:
No
Yes
Measure the voltage at TP:+1.1V.
Is it 1.1V?
Is it 1.1V?
Related parts:
No
Yes
Measure the voltage at TP:+1.5V.
Is it 1.5V?
Is it 1.5V?
Related parts:
C3039,C3023,R3014,C3018,R3009,
C3040,IC3003,C3016,L3002,R3004,
R3008,C3012,C3011,C3041,C3042,
R3030,C3008,C3005
C3040,IC3003,C3016,L3002,R3004,
R3008,C3012,C3011,C3041,C3042,
R3030,C3008,C3005
C3059,C3020,R3013,C3060,C3017,
R3006,IC3002,C3014,L3001,R3003,
R3005,C3010,C3009,C3061,C3062,
R3032
R3006,IC3002,C3014,L3001,R3003,
R3005,C3010,C3009,C3061,C3062,
R3032
IC3001,C3003,R3002,R3001,C3001,
R3033
R3033
No
Yes
Measure the voltage at TP:CL_VDD18V.
Is it 1.8V?
Is it 1.8V?
Related parts: IC1001,C4070,C4068
No
Yes
Measure the voltage at TP:CL_VDD12V.
Is it 1.3V?
Is it 1.3V?
Related parts: IC1001,L4010,C4088
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
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