User's Manual

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8. Trouble Shooting Guide
No. Problem Solution
1 Power on Failure A. Unreliable connection between the battery and the phone, please
reinstall the batter.
B. The protective tube of power cable is burnt out. Please change it.
C. Power switch in failure, please change it.
D. The rechargeable battery is out of power. Please recharge or
change a new one.
E. CPU is broken, Please change the IC.
2 Phase lock loop
unlocked (Beeping)
A. Channel frequency beyond the range, reset channel data.
B. The crystal X4 of phase lock loop is broken. Please change it.
C. The oscillator tube is broken. Please change it.
D. The IC1 of phase lock loop is broken. Please change IC.
3 No talkback A. The frequency is not right. Please reselect the channel of the same
frequency.
B. The CTCSS/DCS code is not the same. Please reset it.
C. It is out of the effective communication range.
4 No receiving signal A. The antenna is not in good contact. Please fasten the antenna head.
B. The high-frequency amplifying tube Q20 is broken. Please change
it.
C. The squelch level is set to high Please reset the squelch level.
D. The mixed tube Q19 is broken. Please change it.
E. The FM IC5 is broken. Please change IC.
5 The red transmission
Indicator lights but
no sound is heard.
A. Power module Q11 damaged, no power output, please change the
module.
B. MIC damaged, please change it.
6 The green receiving
indicator lights but
no sound is heard.
A. The speaker is broken. Please change it.
B. The audio power amplifierIC8 is broken. Please change IC.
9. Major Specifications
PT4208
General Specifications
Frequency
136~174MHz, V
400~450MHz, U
420~470MHz, U
Channel Number 16
Channel Spacing 25kHz(broadband) /12.5kHz(narrowband)
External Dimension (HXWXD) 119mm×54.5mm×34mm
Weight 247g (including the battery and the Antenna )
Operating Temperature -25℃ ~ +55℃
Receiving sensitivity ≤0.28μV
Frequency stability 2.5ppm
TX power 4W (UHF) ，5W (VHF)