Icom IC-R75 Instruction Manual - Page 40

11 MAINTENANCE ■ 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 on • DC power cable is improperly connected. when the [POWER] switch • Fuse is blown. is pushed. SOLUTION • Reconnect the DC power cable correctly. • Check for the cause, then replace the fuse with a spare one. (Fuses are installed in the DC power cable and the internal MAIN unit.) REF. - p. 37 No sound comes from the • Volume level is too low. speaker. • The squelch is closed. • Rotate [AF] clockwise to obtain a suitable listening level. • Rotate [RF/SQL] to 12 o'clock position to open the squelch. p. 2 p. 14 Sensitivity is low. • The antenna is not connected properly. • The antenna for another band is selected. • The attenuator is activated. • Reconnect to the antenna connector. • Select an antenna suitable for the operating frequency. • Push [ATT] to turn the function OFF. - p. 16 p. 16 Receive audio is distorted. • The operating mode is not selected correctly. • PBT function is activated. • Noise blanker function is activated. • Preamp is activated. • The optional noise reduction is activated and the [NR] level is set too high. • Select a suitable operating mode. • Set [TWIN PBT] to the center position. • Push [NB] to turn the function OFF. • Push [P.AMP] once or twice to turn the function OFF. • Push [NR] to turn the function OFF. p. 14 p. 15 p. 15 p. 16 p. 20 Programmed scan does • Squelch is open. • Set [RF/SQL] to the threshold point. p. 14 not stop. • [RF/SQL] is assigned to RF gain control and • Reset [RF/SQL] control assignment and set it to pgs. squelch is open. the threshold point. 14, 30 Programmed scan does • The same frequencies have been programmed • Program different frequencies in scan edge p. 22 not start. in scan edge memory channels P1 and P2. memory channels P1 and P2. Memory scan does not • 2 or more memory channels have not been • Program 2 or more memory channels. start. programmed. p. 22 Select memory scan does • 2 or more memory channels have not been • Designate 2 or more memory channels as select p. 26 not start. designated as select channels. channels for the scan. "F.AGC" flashes in the • A scan or band scope function is activated via • If these functions are not in use, push [AGC] to - function display. an optional RS-R75 remote control software. deactivate the function. The displayed frequency • The dial lock function is activated. does not change properly. • The internal CPU has malfunctioned. • Push [LOCK] to deactivate the function. • Reset the CPU. p. 13 See below. SCAN DISPLAY ■ Resetting the CPU Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to their defaults. When first applying power or when the function seems to be displaying erroneous information, reset the CPU as follows: q M ake sure receiver power is OFF. w W hile pushing [UP Y] and [Z DN], push [POWER] to turn power ON. • The internal CPU is reset. • The receiver displays its initial VFO frequencies when resetting is complete. [POWER] [ZDN] [UPY] 36