Panasonic KX-TG6811CAB / KX-TG6811CAM / KX-TG6812CAB / KX-TG6821CAB / KX-TG6821CAM / KX-TG6822CAB / KX-TGA681RUB / KX-TGA681RUM Service Manual ▷ View online
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KX-TG6811CAB/KX-TG6811CAM/KX-TG6812CAB/KX-TG6821CAB/KX-TG6821CAM/KX-TG6822CAB/KX-TGA681RUB/KX-TGA681RUM
9.1.8.
Bell Reception
9.1.8.1.
Base Unit
*1 KX-TG6821 only
9.1.8.2.
Handset
Cross Reference:
Telephone Line Interface (P.12)
Check Link (P.30)
How to Check the Handset Speaker or Receiver (P.61)
Check Link (P.30)
How to Check the Handset Speaker or Receiver (P.61)
9.1.9.
Check TAM Operation (for KX-TG6821 only)
Cross Reference:
Power Supply Circuit (P.13)
Note:
(*1) When replacing FLASH MEMORY (IC601), TAM data need to be written to it. Refer to Base Unit of Things to Do after
Replacing IC or X'tal (P.58)
Replacing IC or X'tal (P.58)
When bell signal is coming, is there bell sound
signal at BBIC (IC501: 5)?
signal at BBIC (IC501: 5)?
NO
Check around IC501 (30), C476, C477, C478,
C479, D472, D473, SPp, SPn and SPEAKER.
C479, D472, D473, SPp, SPn and SPEAKER.
YES
Check around C110, C111, C112, C113, C114,
R111, R112, R113, R114, D113, Q111, P101 .
R111, R112, R113, R114, D113, Q111, P101 .
NO
When bell signal is coming, is there bell sound
signal at IC501 (31, 29)?
signal at IC501 (31, 29)?
*1
Does the bell sound from SPEAKER?
Check around SP+, SP- .
When bell signal coming, is there bell sound signal
at BBIC (IC1: 35, 37)?
at BBIC (IC1: 35, 37)?
NO
NO
YES
When bell signal coming, is there bell sound signal
at SP+, SP- ?
at SP+, SP- ?
YES
Check BBIC (IC1), C78, C79, C73, C72, D13,
D14, R77, R76.
D14, R77, R76.
NO
Check cable of SPEAKER and resistance value
of SPEAKER.
of SPEAKER.
Check IC601 and BBIC (IC501) of Base Unit. (*1)
Is there a TAM icon on the Handset display?
Turn on the Answering System.
Check Power Supply Circuit.
NO
NO
YES
Is the voltage of VBAT of Base Unit about 3.0 V
and +3.0V about 3.0 V?
and +3.0V about 3.0 V?
YES
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KX-TG6811CAB/KX-TG6811CAM/KX-TG6812CAB/KX-TG6821CAB/KX-TG6821CAM/KX-TG6822CAB/KX-TGA681RUB/KX-TGA681RUM
9.1.10. Power failure mode
9.1.10.1. Operation with supply from handset under electric power failure
After base and handset make link, pull out AC plug of base from the socket.
Put handset on base under electric power failure.
Put handset on base under electric power failure.
Cross Reference:
Supply from handset (P.17)
9.1.10.2. Continuing a call during power failure
Cross Reference:
Supply from large capacitor (P.17)
Does set make link in 90 seconds?
Yes
OK
No
What is indicated
on LCD of
handset?
None
Check user setting about power
Is pulse voltage of
handset CHG+
settled from 0.2V to
2.0V in the state of
connecting base and
handset?
Check charge terminal's impurities.
Press OFF and check again.
Press OFF and check again.
"Base no power ..."
"Place on
base ..."
base ..."
Check R18 or R19 or BBIC of handset
Yes
No
Check C362, C363. (base)
"Supplying ..."
What volt is handset
CHG+ in the state
of connecting base
and handset?
Over 2.0V
Under 2.0V
Check supply circuit of handset.
Check supply circuit of base and
charge terminal's impurities.
charge terminal's impurities.
Battery Low state
Use the battery charged enough
and check again.
and check again.
Press talk key and wait for 3 minutes.
Pull out the AC plug of base from the socket.
Continuing a call
OK
Discontinuing a call
Press talk key after plug in and wait for
3 minutes , check Vcap.
3 minutes , check Vcap.
Under 2.9V
Over 2.9V
Check supply from large capacitor circuit
Check CAP_SW circuit and BBIC port control.
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KX-TG6811CAB/KX-TG6811CAM/KX-TG6812CAB/KX-TG6821CAB/KX-TG6821CAM/KX-TG6822CAB/KX-TGA681RUB/KX-TGA681RUM
9.2.
Troubleshooting by Symptom (Base Unit)
If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester
(*1) or not.
(*1) or not.
Note:
(*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as Acoustic
level in detail.
(*2) Refer to Check Point (Base Unit)(P.39)
level in detail.
(*2) Refer to Check Point (Base Unit)(P.39)
9.2.1.
Check Point (Base Unit)
Please follow the items below when BBIC or EEPROM or FLASH is replaced.
Note:
After the measuring, suck up the solder of TP.
*: The Setting Method of JIG (Base Unit) (P.52) is required beforehand.
The connections of simulator equipment are as shown in Adjustment Standard (Base Unit) (P.54).
*: The Setting Method of JIG (Base Unit) (P.52) is required beforehand.
The connections of simulator equipment are as shown in Adjustment Standard (Base Unit) (P.54).
Symptom
Remedy (*2)
You don’t have DECT Tester.
You have DECT Tester.
(Model Number: CMD60)
You cannot dial.
Check item (A) - (G).
Check item (A) - (G), (H) - (L).
You cannot hear the caller’s voice.
Check item (A) - (E), (M).
Check item (A) - (E), (H) - (L), (M).
You cannot use the handset a little away from base unit even if the
handset is within range of the base unit.
handset is within range of the base unit.
-
Check item (H) - (L).
The acoustic transmit level is high or low.
Check item (M).
Check item (M).
The acoustic reception level is high or low.
Check item (M).
Check item (M).
Base unit and handset do not link to each other.
Check item (A) - (G).
Check item (A) - (L).
The unit cannot charge.
Check item (N).
Check item (N).
TAM does not work. (for KX-TG6821 only)
Check item (O).
Check item (O).
Items
Check
Point
Procedure
Check or
Replace Parts
(A)
3.0 V Supply
Confirmation
Confirmation
VBAT
1. Confirm that the voltage between test point VBAT and GND is 3.0 V ± 0.2 V.
IC302, C341,
R321, R322,
R323
(B)
3.0 V Supply
Confirmation
Confirmation
+3.0V
1. Confirm that the voltage between test point +3.0V and GND is 3.0 V ± 0.02 V.
2. Adjust the 3.0 V voltage of +3.0V executing command “VDA“.
2. Adjust the 3.0 V voltage of +3.0V executing command “VDA“.
IC501, C503
(C)*
BBIC Confirmation
-
1. BBIC Confirmation (Execute the command “getchk”).
2. Confirm the returned checksum value.
2. Confirm the returned checksum value.
Connection of checksum value and program number is shown below.
IC501, X501
(D)* EEPROM Confirmation
-
1. EEP-ROM Confirmation (Execute the command "sendchar EPV").
2. Confirm the returned Value. (Value for reference is written at "EEPROM C/
2. Confirm the returned Value. (Value for reference is written at "EEPROM C/
SUM” in Software_Version_Table.xls).
IC501, IC611,
C611, RA611
(E)* BBIC Clock Adjustment
CKM
1. Input Command “ sendchar sfr”, then you can confirm the current value.
2. Check X’tal Frequency. (13.824 MHz ± 100 Hz).
3. If the frequency is not 13.824 MHz ± 100Hz, adjust the frequency of CKM
2. Check X’tal Frequency. (13.824 MHz ± 100 Hz).
3. If the frequency is not 13.824 MHz ± 100Hz, adjust the frequency of CKM
executing the command “sendchar sfr xx xx (where xx is the value)” so that
the reading of the frequency counter is 13.824000 MHz ± 7 Hz.
the reading of the frequency counter is 13.824000 MHz ± 7 Hz.
IC501, X501,
C508, C509
(F)* Hookswitch Check with
DC Characteristics
-
1. Connect Telephone Socket to Tel-simulator which is connected with 600
.
2. Set line voltage to 48 V and line current to 40mA at off-hook condition of
normal telephone.
3. Execute the command “hookoff”
4. Confirm that the line current is 40 mA ± 5 mA.
5. Execute the command “hookon”.
6. Confirm that the line current is less than + 0.8 mA.
4. Confirm that the line current is 40 mA ± 5 mA.
5. Execute the command “hookon”.
6. Confirm that the line current is less than + 0.8 mA.
P101, D101,
Q141, Q161,
Q142, D141,
Q142, D141,
R141~R145,
R159~R169
(G) DTMF Generator Check
-
1. Connect Telephone Socket to DTMF tester. (Load=600
)
2. Link Handset and push dial key.
3. Confirm DTMF character.
4. Confirm that the high Group is -3.0 dBm ± 2.0 dB.
5. Confirm that the low Group is -6.0 dBm ± 2.0 dB.
3. Confirm DTMF character.
4. Confirm that the high Group is -3.0 dBm ± 2.0 dB.
5. Confirm that the low Group is -6.0 dBm ± 2.0 dB.
IC501, L505,
C184, D141
checksum value
66D6
program number
DD81EN
ex.)
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KX-TG6811CAB/KX-TG6811CAM/KX-TG6812CAB/KX-TG6821CAB/KX-TG6821CAM/KX-TG6822CAB/KX-TGA681RUB/KX-TGA681RUM
(H)*
Transmitted Power
Confirmation
ANT1
Short ANT1/2 pattern to GND.
1. Configure the DECT tester (CMD60) as follows;
<Setting>
• Test mode: FP
• Traffic Carrier: 5
• Traffic Slot: 4
• Mode: Loopback
• PMID: 00000
• RF LEVEL = -70 dBm.
• Traffic Carrier: 5
• Traffic Slot: 4
• Mode: Loopback
• PMID: 00000
• RF LEVEL = -70 dBm.
2. Execute the command ”sendchar TST”.
3. Execute the command “sendchar dmv 2 2”.
4. Check that “Signalling Status” has been set to “Locked”, then press “ACCEPT
3. Execute the command “sendchar dmv 2 2”.
4. Check that “Signalling Status” has been set to “Locked”, then press “ACCEPT
RFPI”.
5. Initiate connection from Dect tester (“set up connect”)
6. Execute the command “ANT1”.
7. Confirm that the NTP value at ANT is 18.5 dBm ~ 25.0 dBm.
6. Execute the command “ANT1”.
7. Confirm that the NTP value at ANT is 18.5 dBm ~ 25.0 dBm.
IC501, C819,
C893, C894,
C895, C896,
C895, C896,
DA802, L503,
L504
(I)*
Modulation Check
ANT1
Follow steps 1 to 6 of (H).
7.Confirm that the B-Field Modulation is -350 ± 50/+350 ± 50 kHz/div using data
type Fig31.
type Fig31.
Refer to (H)
(J)* Frequency Offset Check
ANT1
Follow steps 1 to 6 of (H).
7.Confirm that the frequency offset is < ±20 kHz.
Refer to (H)
(K)*
Sensitivity Receiver
Confirmation
ANT1
Follow steps 1 to 6 of (H).
7.Set DECT tester power to -88 dBm.
8.Confirm that the BER is < 1000 ppm.
8.Confirm that the BER is < 1000 ppm.
Refer to (H)
(L)*
Power RAMP
Confirmation
-
Follow steps 1 to 6 of (H).
7.Confirm that Power RAMP is matching.
Refer to (H)
(M)
Audio Check
-
1. Link with Handset which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50 mA.
3. Input -45 dBm (600
2. Set line voltage to 48 V and line current to 50 mA.
3. Input -45 dBm (600
)/1 kHz to MIC of Handset. Measure the Level at Line I/F
and distortion level.
4. Confirm that the level is -4.5 dBm ± 5 dB and that the distortion level is < 5 %
at TEL Line (600
Load).
5. Input -20 dBm (600
)/1 kHz to Line I/F. Measure the Level at Receiver of
Handset and distortion level (Receive volume set to second position from
minimum).
minimum).
6. Confirm that the level is -23.5 dBm ± 4 dB and that the distortion level is < 5 %
at Receiver (34
Load).
IC501, SA101,
P101, D101,
Q141, Q142,
Q161, Q171,
Q161, Q171,
R141, R142,
R144, R145,
R144, R145,
D141, L505,
C184, R164,
R177, C173,
R171, R172,
R175, R176,
R177, C173,
R171, R172,
R175, R176,
R178
(N)
Charging Check
-
1. Connect Charge Contact 12
/2 W resistor between charge+ and charge-.
2. Measure and confirm voltage across the resistor is 3.9 V ± 0.4 V.
R371, R372,
D362, C361
(O)
TAM Operation
Confirmation
(KX-6821 only)
-
1. TAM Confirmation (Execute the command "sendchar VPI").
2. Confirm the returned Value (Value is "DD87RN 00").
2. Confirm the returned Value (Value is "DD87RN 00").
IC501, IC601,
C601
Items
Check
Point
Procedure
Check or
Replace Parts
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