Symptom

Probable Cause

Remedy

Unit does not work at all

1. Defective power switch VR101
2. Blown fuse
3. Broken DC power cord
4. Defective IC501

1. Replace
2. Replace
3. Replace
4. Replace

No output from speaker at all

1. Defective external speaker Jack
2. Poor connection on microphone connector
3. Defective push switch on microphone .
4. Defective internal speaker
5. Defective D105, VR201, SW7, 5. Defective D105, VR201, SW7, IC201, IC202 or other components

1. Repair or Replace
2. Repair or Replace
3. Repair or Replace
4. Replace
5. Replace the defective components

No noise on speaker

1. Measure all the voltage of Q101, Q102, Q103, Q104, Q105, Q106, Q107, Q112 and IC201, IC202 with voltage chart.
2. Defective squelch circuit components (RV201, VR201, IC201, Q203, Q204, Q205, Q510, Q511)

1. Replace
2. Replace

Squelch does not work

1. Defective VR201, RV203, IC201
2. Improperly adjusted RV203

1. Replace defective components
2. Readjust

No modulation

1. Defective microphone
2. Poor Audio output and defective modulation microphone amplifier components (IC201, IC202)
3. Defective microphone connector component
4. Defective ALC Circuit D208

1. Replace
2. Replace the defective component(s)
3. Replace
4. Replace the defective component(s)

LED meter does not work

1. Defective D212, D213, D214, D215
2. Defective IC203
3. Defective D205, RV201, RV202

1. Replace
2. Replace
3. Replace

LED display does not work

1. Defective RED wire fuse
2. Defective LED501, IC501

1. Replace
2. Replace

P.A does not work

1. Defective SW9
2. Defective Q201, Q202, Q506, D504, IC501, IC201, IC202

1. Replace
2. Replace

Channel selector does not work.

1. Defective IC501, SW2, SW5, SW4, SW5, SW6, Q503, Q504

1. Replace

RF gain does not work

1. Defective VR102, D101, D103, D104

1. Replace

ANL does not work

1. Defective SW10
2. Defective Q107

1. Replace
2. Replace

NB does not work

1. Defective SW1
2. Defective D106, D107, Q108, Q109, Q110, Q111

1. Replace
2. Replace

CH9 does not work

1. Defective SW2
2. Defective D502, D503, IC501

1. Replace
2. Replace

Weather radio does not work

1. Defective SW7
2. Measure all the voltage of Q601, Q602, Q603, Q604, Q605 and Q606 with voltages chart.

1. Replace
2. Replace