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KX-TGC220/KX-TGC222/KX-TGC223/KX-TGCA20
9.1.12. Bell Reception
9.1.12.1. Base Unit
*1 TGC220 only
9.1.12.2. Handset
Cross Reference:
Telephone Line Interface (P.14)
Check Link (P.30)
How to Check the Handset Speaker or Receiver (P.58)
9.1.13. Check TAM Operation
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.55)
When bell signal is coming, is there bell sound
signal at BBIC (IC501:CIDINp, CIDINn)?
NO
Check around IC501 (VDD_PA), C506, C472, C473,
C477, C478, R477, R478
YES
Check around C103, C104, C105, C106, C107,
C109, C110, C111, C113, R101, R102, R103, R104,
R109, R110, R111, R112, P101
NO
When bell signal is coming, is there bell sound
signal at IC501 (SPP, SPN)?
*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,
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 VDD3 of Base Unit about 3.0 V
and VDD1 about 1.8 V, VDD4 about 3.0 V,
VDD5 about 3.0 V?
YES
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