User's Manual

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.
¤˝ Battery could completely discharge.
¤˛ Battery cell twist..
¤ˇ Touch problem come between Battery and Radio.
¤Ł Fail to transmit
¤˝ Run out of battery or charge problem.
¤˛ Fault of PTT key.
¤ˇ Fault of Q311,321,7.
¤Ø Transmitter works but frequency is unmatched
¤˝ Out of order in frequency synthesizer.
¤˛ Out of order in X-tal(X401).
¤Œ Audio does not sound(Tx power and Tx frequency are normal)
¤˝ Problem of microphone or mic connector.
¤˛ IC U701 problem.
¤º Tx is set when switch is on.
¤˝ Tx switch problem
2. Receiver
¤ Rx does not work
¤˝ Speaker line open problem or connector problem.
¤˛ Receiver power circuit problem.
¤ˇ Audio amplifier Base band IC U602 problem.
¤Ł Only noise sound
¤˝ IC U201 problem.
¤˛ VCO problem.
¤Ø Rx sensitivity is weak
¤˝ Antenna mounting problem.
¤˛ Front-End circuit problem.
¤ˇ Local oscillation frequency deviation.
¤— F1 saw filter fail.
¤ VCO problem.
¤Œ Squelch does not work
¤˝ IC U201 problem.
¤˛ Control logic problem.