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3.2.2.
Check Battery Charge
[Changed from original section “9.1.2. Check Battery Charge”]
3.2.2.1.
Handset
Cross Reference:
Check Power (P.11)
Charge Circuit
Charge Circuit
3.2.3.
Bell Reception
[Changed from original section “9.1.8. Bell Reception”]
3.2.3.1.
Base Unit
3.2.3.2.
Handset
Cross Reference:
Telephone Line Interface
Check Link
How to Check the Handset Speaker or Receiver
Check Link
How to Check the Handset Speaker or Receiver
Is BBIC (IC1: 34) high at charge state?
Check Charge Circuit.
Check Power of Handset.
Is Check Power OK?
NO
NO
YES
Check around C54, C55, R36, R37.
When bell signal is coming, is there bell sound
signal at BBIC (IC7: 15,17)?
signal at BBIC (IC7: 15,17)?
NO
YES
When bell signal is coming, is there bell sound
signal at BBIC (IC7: 11)?
signal at BBIC (IC7: 11)?
Check around C3, C4, C5, C6, R3, R4, R5, R6,
C136, C137, R32, R33, R34, R35, C52, C53,
P1, C168, C42, C43,R42,R43
C136, C137, R32, R33, R34, R35, C52, C53,
P1, 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: 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 , C77, C76, R77, R76.
D14 , C77, C76, R77, R76.
NO
Check cable of SPEAKER and resistance value
of SPEAKER.
of SPEAKER.
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