1. the speaker is broken; replace it.
2. Audio power amplifier IC may be damaged; replace it.
3. Check whether the volume knob is adjusted to the maximum.
Q
The transmission indicator is red but the call receiver hears no voice.
A
1. No output from the power amplifier tube; replace with a new tube.
2. The microphone is broken. Replace it.
3. Check whether the frequency is consistent.
4. Beyond the coverage.
Q
After installing SIM card, the boot indicator flashes red and cannot log in normally
A
1. Check whether the SIM card has a locked PIN (can be viewed on the mobile phone)；
2. Check whether it is necessary to set the corresponding APN (the one who sells the card knows the APN)；
3. Check whether the SIM card is a directional traffic card. If it is a directional traffic card, you need to bind the IP of our server-related domain name (contact the manufacturer).
Q
Unable to talk to other members of the group
A
1. If they are on the same server, check whether you are in a WiFi network environment (some managed routes restrict IP for voice communication).
2. If you are on different servers, set the default server to the same server from the network management background;
Q
The machine is quickly on-line and off-line
A
1. The network fluctuates greatly, you can try to install SIM card to test the network connection speed；
2. IMEI duplicates, resulting in two IDs in a login.
