User's Manual

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4-6. Symptoms, Check point & Correction
a) Diagnosis method
1) Check each switch to work well.
2) Check voltage of battery.
3) Problem develops from transmitter or receiver?
b) Troubleshooting
1) Transmitter
-. Power key is on condition but does not work.
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Battery could completely discharge.
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Battery cell twist ..
 Touch problem come between Battery and Radio.
-. Fail to transmit.
 Run out of battery or charge problem.
 Fault of PTT key.
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Fault of Q4,Q3,Q2.Q1
-. Transmitter works but frequency is unmatched
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Out of order in frequency synthesizer.
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Out of order in X-tal frequency(X2)
-. Audio does not sound (Tx power and Tx frequency are normal)
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Problem of microphone or mic connector.
-. Tx is set when switch is on
 Tx switch(PTT) problem.
2) Receiver
-. Rx does not work
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Speaker line open problem or connector problem.
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Receiver power circuit problem.
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Audio amplifier Base band IC U2 problem.
-. Only noise sound