SYMPTOM

PROBLEM

REMEDY

Unit does not work at all

1. Defective power switch VR-l
2. Defective Q301 ,IC5(LC72338)

1. Replace
2. Replace

No output from speaker at all

1. Defective external speaker jack
2. Defective IC201 ,D202,IC401,
JACK 401 MIC or cold solder

1. Replace or repair
2. Replace defective component

No noise on speaker

1. Measure all the voltage of Q501 Q502,Q505,Q201 ,VR-401
2. Defective Squelch circuit components IC202,Q203,Q403,VR501

1. replace
2. Replace

Squelch does not work

1. Defective VR501 IC202
2. lmproperly adjusted RV-1

1. Replace
2. Readjust

No modulation

1. Defective CM901
2. Poor audio output and defective modulation microphone amplifier components(IC401)
3. Defective MIC Module

1. Replace
2. Replace defective components
3. Replace

LCD Meter does not work

1. Defective IC201,VR301,IC202

1. Replace

LCD Display does not work

1. Defective S902

1. Replace

CH UP/DOWN not work

1. Defective XT901,IC901,IC300

1. Replace

CH9.does not work

1. Defective IC901

1. Replace

No TX output power

1. Defective Q601,Q609,Q602,Q603

1. Replace