Icom IC-7700 Instruction Manual - Page 182

13 MAINTENANCE ■ Troubleshooting The following chart is designed to help you correct problems which are not equipment malfunctions. If you are unable to locate the cause of a problem or solve it through the use of this chart, contact you nearest Icom Dealer or Service Center. D Transceiver power PROBLEM POSSIBLE CAUSE Power does not come on • Power cable is improperly connected. when the [POWER] switch • The internal power supply is turned OFF. is pushed. • Circuit breaker is tripped. SOLUTION REF. • Re-connect the AC power cable correctly. p. 2-5 • Turn the internal power supply ON. p. 3-2 • Check for the cause, then re-set the circuit - breaker. D Transmit and receive PROBLEM No sounds from speaker. POSSIBLE CAUSE the • Volume level is too low. • The squelch is closed. • The transceiver is in transmit. SOLUTION REF. • Rotate [AF] clockwise to obtain a suitable lis- p. 3-9 tening level. • Turn [SQL] to 10 o'clock position to open the p. 3-9 squelch. • Push [TRANSMIT] to receive or check the p. 3-12 SEND line of an external unit, if connected. Sensitivity is too low, and • The antenna is not connected properly. only strong signals are • The antenna for another band is selected. audible. • The antenna is not properly tuned. • The attenuator is activated. • Re-connect to the antenna connector. - • Select an antenna suitable for the operating p. 10-2 frequency. • Push and hold [TUNER] for 1 sec. to manually p. 10-6 tune the antenna. • Push [ATT] (MF4) several times to select "ATT p. 5-9 OFF." Received audio is unclear • Wrong operating mode is selected. • Select a suitable operating mode. p. 3-8 or distorted. • PBT function is activated. • Push and hold [PBT-CLR] for 1 sec. to reset the p. 5-12 function. • Noise blanker is turned ON when receiving a • Push [NB] to turn the noise blanker OFF. p. 5-16 strong signal. • Preamp is activated. • Push [P.AMP] (MF3) once or twice to turn the p. 5-9 function OFF. • The noise reduction is activated and the [NR] • Set the [NR] control for maximum readability. p. 5-17 control is too far clockwise. The [ANT] switch does not • The antenna switch has not been activated. • Set the antenna switch in set mode to "Auto" or p. 10-4 function "Manual." Transmitting is impossible. • The operating frequency is not inside a ham • Set the frequency to be in a ham band. band. p. 3-5 Output power is too low. • [RF PWR] is set too far counterclockwise • [DRIVE] is set too far counterclockwise • [MIC] is set too far counterclockwise • The antenna for another band is selected. • The antenna is not properly tuned. • Rotate [RF PWR] clockwise. p. 3-12 • Set [DRIVE] to a suitable position. p. 3-13 • Set [MIC] to a suitable position. p. 3-12 • Select an antenna suitable for the operating p. 10-2 frequency. • Push and hold [TUNER] for 1 sec. to manually p. 10-6 tune the antenna. No contact can be made • RIT or ∂TX function is activated. with another station. • Split frequency function is activated. • Push [RIT] or [∂TX] to turn the function OFF. • Push [SPLIT] to turn the function OFF. pgs. 5-10, 6-4 p. 6-6 Transmit signal is unclear • [MIC] is set too far clockwise or distorted. • Set [MIC] to a suitable position. p. 3-12 Repeater cannot be accessed. • Split frequency function is not activated. • Push [SPLIT] to to turn the function ON • Programmed subaudible tone frequency is • Reset the frequency using set mode. wrong. p. 6-6 p. 4-33 13-2