TP620 Service Manual
Voltage Stabilizing
Power
Output Voltage 5V-30V, Current: 5A
9. Troubleshooting
No.
Problem
Cause and Solution
1
Failed to turn on the
radio
A
．
Check if the battery is in low power. If the battery is low, please
charge it or change it.
B
．
Check if there is poor contact in the power-on knob. Please change
the knob and try again.
C
．
The power connecting wire is in poor contact with the battery.
Please reinstall it and try again.
D
．
The reverse power connection leads to the power protective tube
F401 being turned on. Please change the protective tube and try
again.
2
Failed to
communicate with
each other
A
．
The frequencies between the two radios differ. Please select the
same channel with frequency.
B
．
The CTCSS/CDCSS signaling of the two radios differ. Please reset
with your computer.
C
．
Beyond the communication scope.
3
Failed to receive the
signal
A
．
Poor contact of the antenna. Please fasten the antenna.
B
．
The Tx frequency and Rx frequency differ. Please select the same
Tx/Rx frequency again.
C
．
Beyond the communication scope.
4
The Rx green
indicator lights up
without any voice
A
．
Check if the volume is at its lowest level. If so, turn on the volume.
B
．
Check if the speaker is broken. If so, please change the speaker.
5
The programming is
abnormal
A
．
Wrong wire connection. Please check if the connection is right.
B
．
Check if the computer USB drive is installed. If not, please install it
properly.
C
．
Poor contact in earphone interface board. If so, please change the
interface board.
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