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GX15
3. No voice is heard from the earpiece.
Phone (Handset)
Do keypad tones and melodies sound?
Is 0.5 V or more applied to R101 (IC103 pin 9 side)?
Is 0.5 V or more applied to JK101 pin 5?
Is 0.5 V or more applied to JK101 pin 3?
Is 0.5 V or more applied to TP120?
Is 2.4 - 2.6 V applied to TP176?
Is 2.4 - 2.6 V applied to R115 (IC103 pin 76 side)?
IC103 is defective.
Hands free kit (Headset)
Replace the hands free kit. Is sound produced?
Is signal sent to JK101 pin 4?
Is signal sent to TP121?
Is signal sent to R124 (IC103 pin 60 side)?
Disconnect the hands free kit. Is voice heard in phone mode?
Is the voltage 0 V on R101 (IC103 pin 9 side)?
Socket JK101 is defective.
CONFIDENTIAL
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
NO
Go to the section "Earpiece (for loud speaker) does not work".
NO
(see page 2-50)
YES
IC103 is defective.
Parts between socket JK101 pin 5 and IC103 pin 9 are defec-
YES
tive.
YES
Socket JK101 is defective.
YES
Parts between socket JK101 pin 3 and TP120 are defective.
YES
R122 is defective.
YES
R115 is defective. (Hands free kit mode is set.)
The hands free kit is defective.
YES
Socket JK101 is defective, or the hands free kit is in a poor
YES
contact with the socket plug.
YES
Parts between socket JK101 pin 4 and TP121 are defective.
YES
Parts between IC103 pin 60 and TP120 are defective.
NO
IC103 or IC106 is defective.
YES
IC103 is defective.
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