KX-TG6811UAB, KX-TG6811UAM, KX-TG6812UAB, KX-TG6821UAB, KX-TGA681RUB, KX-TGA681RUM - Panasonic Telephone Service Manual (repair manual). Page 37

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37
KX-TG6811UAB/KX-TG6811UAM/KX-TG6812UAB/KX-TG6821UAB/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)
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)
When bell signal is coming, is there bell sound 
signal at BBIC (IC501: 5)?
NO
Check around IC501 (30), C476, C477, C478, 
C479, D472, D473, SPp, SPn  and SPEAKER.
YES
Check around C110, C111, C112, C113, C114,
R111, R112, R113, R114, D113, Q111, P101 . 
NO
When bell signal is coming, is there bell sound 
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)?
NO
NO
YES
When bell signal coming, is there bell sound signal
at SP+, SP- ?
YES
Check BBIC (IC1), C78, C79, C73, C72, D13, 
D14, R77, R76.
NO
Check cable of SPEAKER and resistance value
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?
YES
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