Kirisun TM840 Service Manual

TM840 Service Manual
Chapter 9. Common Fault Phenomenon and Elimination Method
No Problem Causes and Solutions
1 The radio cannot be powered on.
A．The power ON/OFF key may suffer from poor contact. Clear the metal dome with alcohol and try again.
B The connecting between power cable and power supply is not good enough.
C．
The power is connected inversely which leads to the power protective tube open. Replace the protective tube and try
again.
2
You cannot communicate with other
members
A．The frequency settings may be different from others. Set your TX/RX frequencies to be the same as others.
B．
The CTCSS/CDCSS signaling may be different from others. Set your CTCSS/CDCSS signaling to be the same as
others.
C．Your place may be too far away from the others, beyond the radio’s coverage area.
3 The radio cannot receive signals
A．Check whether the antenna is connected well with radio, please reinstall it again.
B．Check whether the tx and rx is set right.
C. You place may be too far away from the others, beyong the radio’s overage area.
4
During receiving, LED is green but no
voice.
A．Check whether the volume is smallest or not. If so, increase the volume.
B．Check whether the speaker is broken or not. If so, change the speaker.
5 GPS cannot locate your position.
A. Check whether the antenna is dual band or not. If not, use a dual band antenna to replace the old one.
B. Check whether the GPS setting is correct or not. If not, set it correctly.
C. Maybe there is some other RF interference around the radio’s place. Go to an open sky place and try again.
6 Programming failed.
A．Connection between the radio and PC is not good enough. Check and try again.
B．
Programming interface has poor contact with external programming cable. If so, change the programming interface
on mobile..
12.16 Ω dummy load 16Ω，3W
13.Power supply output Output: 5Vto 30V，Current：20A
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Kirisun TM840 Specifications

General

Brand	Kirisun
Model	TM840
Category	Radio
Language	English