Icom IC-78 Instruction Manual - Page 41

8 MAINTENANCE s Troubleshooting The following chart is designed to help you correct problems which are equipment malfunctions. If you are not able to locate the cause of a problem or solve it through the use of this chart, contact your nearest Icom Dealer or Service Center. POWER RECEIVE PROBLEM POSSIBLE CAUSE Power does not come • Power cable is improperly connected. on when the [PWR] • Fuse is blown. switch is pushed. SOLUTION REF. • Re-connect the DC power cable correctly. p. 10 • Check for the cause, then replace the fuse p. 40 with the spare one. (Fuses are installed in the DC power cable and the internal PA unit.) No sounds comes out • Volume level is too low. • Rotate [AF] clockwise to obtain a suitable p. 15 from the speaker. listening level. • The squelch is closed. • Turn [RF/SQL] to the position which opens p. 15 the squelch. • The transceiver is in transmitting condi- • Check the SEND line of an external unit, p. 5 tion. if desired. Sensitivity is too low, • The antenna is not connected properly. • Re-connect to the antenna connector. p. 9 and only strong signals • Antenna is not properly matched to the • Push [TUNE] to tune the connected an- p. 18 are audible. operating frequency. tenna tuner. • Wrong tuner condition is selected in set • Set the proper condition for the connected p. 32 mode. tuner. • The attenuator is activated. • Push [ATT] to turn the attenuator OFF. p. 19 Received audio is un- • Wrong type of mode (emission) is se- • Push [MODE] to select the proper operat- p. 15 clear or distorted. lected. ing mode (emission). • Noise blanker is turned ON when receiv- • Push [NB] to turn the noise blanker OFF. p. 19 ing a strong signal. • The [RIT] control is rotated too far clock- • Adjust the [RIT] control to receive proper p. 19 wise, or counterclockwise. audio output. Your signal does not • Antenna tuner is improperly matched to • Push [TUNE] to tune the connected an- p. 18 reach as far away as the operating frequency when manual tenna tuner. usual. tuning is selected. • CW or RTTY mode is selected for voice • Push [MODE] to select USB, LSB, or AM p. 15 transmission. mode. Transmit signal is un- • Wrong type of mode (emission) is se- • Push [MODE] to select the proper operat- p. 15 clear or distorted. lected. ing mode (emission). • Microphone is too close to your mouth. • Speak into the microphone naturally and p. 15 do not hold the microphone too close to your mouth. The displayed channel • The dial lock function is activated. does not change prop- erly. • A quick set mode is selected. • Push [LOCK] to turn the lock function p. 14 OFF. • Push [SET] to exit the quick set mode. p. 28 TRANSMIT DISPLAY 39