Icom IC-M422 Service Manual

Also see for IC-M422: Instruction manual Service manual

Contents

5 - 4ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUEADJUSTMENTPOINTUNIT OPERATION UNIT ADJUSTSENSITIVITY 1 • Channel : CH16 (156.800 MHz)• [SQL] : Max. counterclockwise• Connect a distortion meter with a 4 Ωload to the external speaker lead.• Push [PA•RX ] for 1 sec. to turn theRX speaker mode ON.• Connect an SSG to the antennaconnector and set as ;Frequency : 156.800 MHzLevel : +10 dBμModulation :1 kHzDeviation : ±3 kHz• ReceivingMAIN Connect a DC volt meteror oscilloscope to thecheck point "CP3".MaximumvoltageMAIN L35, L36, L38,L39(Repeate twotimes or more.)SQUELCH 1 • Channel : CH16 (156.800 MHz)• [SQL] : Max. counterclockwise• Set the SSG as;Level : −12 dBμ• ReceivingMAIN Connect a volt meter oroscilloscopeto thecheck point "CP5".1.0 V MAIN R2145-4 RECEIVE ADJUSTMENTL36L35L38CP3Sensitivity check pointR214Squelch adjustmentCP5Squelch check pointSensitivityadjustmentL39