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Hands free kit (Headset)
Replace the hands free kit.
Is the signal sent?
Is 0.7 - 1.8 V applied to JK101 pin 3?
Is approx. 1.7 V applied to IC103 pin 79?
Disconnect the hands free kit. Is speaking voice heard to the
person in the phone mode?
Is the voltage 0 V on R101 (IC103 pin 9 side)?
Replace C123A. Is the problem solved?
Replace JK101. Is the problem solved?
IC103 and IC106 are defective.
CONFIDENTIAL
NO
YES
YES
YES
YES
NO
NO
Hands free kit is defective.
YES
Parts between JK101 pin 3 andTP120 are defective.
NO
Is 0.7 - 1.8 V applied to TP120?
Is 2.4 - 2.6 V applied to TP176?
NO
Is 2.4 - 2.6 V applied to IC103 pin 76?
NO
IC103 is defective.
NO
Is approx. 1.7 V applied to IC103 pin 95?
NO
R262 and R117 are defec-
tive.
IC103 or IC106 is defective.
NO
NO
Socket JK101 is defective. (Phone mode is set.)
YES
C123A is defective.
JK101 is defective, or the socket plug pin 3 is in a poor contact
YES
with hands free kit.
2 – 47
GX15
YES
NO
YES
R122 is defective.
YES
R115 and C108 are defec-
tive.
YES
IC103 is defective.
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