Voice Transmission/Recording Is Impossible - Sharp TQ-GX30E Service Manual

GX30

2. Voice transmission/recording is impossible.

Phone (Handset)
Replace the microphone.
Is the problem solved?
Is 1.2 - 2.1 V applied to both ends of C101?
Is approx. 1.7 V applied to IC103 pin 80?
Is 2.7 or more voltage applied to R192 (IC106 pin 89 side)?
Replace C126 or C133. Is the problem solved?
IC103 and IC106 are defective.
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The built-in microphone is defective or in a poor contact with
YES
the PWB.
L101, L102, and C101 are defective.
NO
Is 1.2 - 2.1 V applied to TP119?
Is 2.4 - 2.5 V applied to TP176?
NO
Is 2.4 - 2.5 V applied to IC103 pin 76?
NO
IC103 is defective.
NO
Is approx. 1.7 V applied to IC103 pin 96?
NO
R263 and R130 are defec-
tive.
NO
R192 is defective. (Headset mode is set.)
YES
C126 or C133 is defective.
2 – 50
YES
NO
YES
R125 is defective.
YES
R115 and C108 are defec-
tive.
YES
IC103 is defective.