Sharp GX30 Service Manual page 45

Trouble found by SPST
(1) (2)
Handset microphone Handset microphone
Handset receiver Hands free receiver
(1) & (2): No voice is heard.
(3) (4)
Hands free microphone Hands free microphone
Hands free receiver Handset receiver
(1) & (2): No voice is heard.
(1): Voice is heard.
(2): No voice is heard.
(1): No voice is heard.
(2): Voice is heard.
(3) & (4): No voice is heard.
(3): Voice is heard.
(4): No voice is heard.
(3): No voice is heard.
(4): Voice is heard.
Troubleshooting (based on [3] Troubleshooting)
See "Phone" in the section "2. Voice transmission/recording is impossible."
See "Hands free kit (monaural headset)" in the section "3. No voice is heard
from the earpiece" or "Hands free kit (stereo headset) - Option" in the section
"3. No voice is heard from the earpiece."
See "Phone" in the section "3. No voice is heard from the earpiece."
See "Hands free kit (headset)" in the section
"2. Voice transmission/recording is impossible."