During receiving, the voice is weak, discontinuous or totally inactive.

Analysis
1.The battery voltage may be low. 
2.The volume level may be low.
3.The antenna may be loosened or improperly installed.
4.The speaker may be blocked or damaged.
Solution
1.Recharge or replace the battery.
2.Increase the volume by rotating the Volume Control Knob.
3.Reattach the antenna after turning off the radio.
4.Clean the surface of the speaker. If the problem cannot be solved, contact your dealer or authorized service center for inspection and repair.