Icom IC-775DSP [60/67] Troubleshooting

Содержание

TROUBLESHOOTING The following chart is designed to help you correct problems which are not equipment malfunctions PROBLEM i 3 0 Power does not come on when the POWER switch is pushed 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 POSSIBLE CAUSE Fuse is blown o a Sensitivity is low Receive audio is dis torted 57 Disconnect any connections then re place the fuse with a spare one p 56 A WARNING NEVER use a nonrated fuse This could cause a fire Internal breaker is thrown Turn power OFF then ON again The internal breaker should be reset If the breaker is thrown again the trans ceiver may need maintenance Volume level is too low Rotate AF clockwise to obtain a suit able listening level pgs 22 23 The squelch is closed Rotate SQL counterclockwise to open the squelch pgs 22 23 The RF control is rotated counter clockwise Rotate RF clockwise The recom mended position is max clockwise p 4 The transceiver is in the transmitting condition Push TRANSMIT OUT or check the SEND line of an external unit if con nected P 1 An external speaker or headphones are connected p 16 Check the external speaker or head phone plug connection Check the speaker ON OFF switch or speaker A B switch when an optional SP 20 EXTERNAL SPEAKER is in use Optional filter setting in H set mode is wrong Correct the optional filter setting using H set mode p 47 Auto APF function is activated for DSP equipped type Push AUTO AF LPF IC 775 with DSP unit to cancel the function p 30 Incorrect antenna is selected with the ANT switches Push ANTI or ANT2 to select the p 2 matched antenna The antenna feedline is cut or shorted Check the feedline and correct any improper conditions The antenna is not properly tuned Push TUNER for 2 sec to manually tune the antenna p 39 The preamp 2 is activated on 18 MHz band o r below Set PREAMP ATT to PRE1 or OFF position P 2 The attenuator function is activated Set PREAMP ATT to OFF position P 2 The operating mode is not selected correctly Select a suitable operating mode p 5 PBT function is activated Set TWIN PBT to the center position pgs 9 28 Noise blanker function is activated Push NB to turn the function OFF P 2 Preamp is activated Set PREAMP ATT to OFF position p 2 NR LEVEL is set too far clockwise for DSP equipped type Set NR LEVEL for maximum read ability p 29 1 No sound comes from the speaker