Sharp GX30 Service Manual page 44

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Trouble found by SPST
(1) Speaker
(2) Hands free Sound is heard in audio test.
No sound is heard in audio test.
(3) Hands free (stereo) Sound is heard in audio test.
No sound is heard in audio test.
(4) Speaker (analog melody)
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See "7. Speaker does not work."
Parts between IC105 pin 10 and IC103 pin 93 are defective, or IC103 is defective.
See "Hands free kit (monaural headset)" in the section "3. No voice is heard from the earpiece."
Parts between IC105 pin 10 and IC103 pin 93; IC105 pin 11 and IC103 pin 94 are defective.
Otherwise IC103 is defective.
See "Hands free kit (stereo headset) - Option" in the section "3. No voice is heard from
the earpiece."
See "9. Video/Voice Recorder playback is impossible."
Otherwise parts between IC105 pin 10 and IC103 pin 93 are defective, or IC103 is defective.
Troubleshooting (based on [3] Troubleshooting)