KX-TG5511CAB, KX-TG5511CAJ, KX-TGA550RUB, KX-TGA550RUJ, KX-TGA551RUB, KX-TGA551RUJ (serv.man2) - Panasonic Telephone Service Manual (repair manual). Page 35

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KX-TG5511CA/KX-TGA550RU/KX-TGA551RU
9.1.8.
Bell Reception
9.1.8.1.
Base Unit
9.1.8.2.
Handset
Cross Reference:
Telephone Line Interface (P.11)
Check Link (P.27)
How to Check the Handset Speaker or Receiver (P.58)
Check around C54, C55, R36, R37.
When bell signal is coming, is there bell sound  
signal at BBIC (IC7: 20, 21)?
NO
YES
When bell signal is coming, is there bell sound
signal at BBIC (IC7: 24)?
Check around C3, C4, C5, C6, R3, R4, R5, R6,
C136, C137, R32, R33, R34, R35, C52, C53, 
L1, L2, C168, C42, C43,R42,R43 
NO
Does the bell sound from SPEAKER?
Check around SP+, SP- .
When bell signal coming, is there bell sound signal 
at BBIC (IC1: 33, 35)?
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, R208, R209
NO
Check cable of SPEAKER and resistance value
of SPEAKER.
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