Icom IC-7410 Instruction Manual - Page 103

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 your nearest Icom Dealer or Service Center. D Transceiver power PROBLEM POSSIBLE CAUSE Power does not turn ON • The power cable is improperly connected. when the [POWER] switch is • A fuse is blown. pushed. SOLUTION REF. • Re-connect the DC power cable correctly. p. 19 • Correct the cause, then replace the fuse with p. 99 an equivalent fuse. (Fuses are installed in the DC power cable and in the internal PA unit.) D Transmit and receive PROBLEM POSSIBLE CAUSE SOLUTION REF. No sound from the speaker. • The audio volume level is too low. • The squelch is closed. • The transceiver is in transmit. • R otate the [AF] control clockwise to obtain a p. 31 suitable listening level. • R otate the [RF/SQL] control to 11 o'clock po- p. 32 sition to open the squelch. • P ush [TRANSMIT] to receive or check the p. 34 SEND line of an external unit, if connected. Sensitivity is too low, and only • The antenna is not connected properly. strong signals are audible. • T he antenna for another band is selected. • The antenna is not properly tuned. • The attenuator is turned ON. • Re-connect to the antenna connector. - • S elect an antenna suitable for the operating p. 82 frequency. • H old down [TUNER] for 1 second to manually p. 83 tune the antenna. • P ush [P.AMP/ATT] to turn OFF the attenuator. p. 55 Received audio is unclear or • The operating mode is not matched. • Select a suitable operating mode. p. 31 distorted. • The Passband Tuning function is turned ON. • Hold down [PBT-CLR] for 1 second to reset p. 59 the function. • T he Noise Blanker function is turned ON when • P ush [NB] to turn OFF the function. p. 60 receiving a strong signal. • Preamplifier is turned ON. • Push [P.AMP/ATT] once or twice to turn OFF p. 55 the function. • T he Noise Reduction function is turned ON • Set the [NR] control for maximum readability. p. 61 and the [NR] control is too far clockwise. [ANT•METER] does not func- • The Antenna Switch function is set to "OFF." • Set the Antenna Switch function to "Auto" or p. 87 tion "Manual" in the Set mode. Transmitting is impossible. • The operating frequency is outside the se- • Set the frequency to be within the selected p. 26 lected ham band. ham band. Output power is too low. • T he [RF PWR] control is set too far counter- • Rotate the [RF PWR] control clockwise. p. 34 clockwise. • T he [MIC] control is set too far counterclock- • Set the [MIC] control to a suitable position. p. 34 wise. • The antenna for another band is selected. • Select an antenna suitable for the operating p. 82 frequency. • The antenna is not properly tuned. • Hold down [TUNER] for 1 second to manually p. 83 tune the antenna. No contact can be made with • The RIT or ∂TX function is turned ON. another station. • The Split function is turned ON. • Push [RIT] or [∂TX] to turn OFF the function. pp. 53, 65 • Push [SPLIT] to turn OFF the function. p. 66 Transmit signal is unclear or • T he [MIC] control is set too far clockwise. distorted. • Set the [MIC] control to a suitable position. p. 34 Repeater cannot be accessed. • The Split function is not turned ON. • Push [SPLIT] to turn ON the function. • T he programmed subaudible tone frequency • Reset the frequency using the Set mode. is wrong. p. 66 p. 52 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 96