Icom IC-M402 Service Manual

Also see for IC-M402: Instruction manual Service manual

Contents

5 - 35-4 RECEIVER ADJUSTMENTSSENSITIVITYSQUELCH• Operating channel : ch16• [SQUELCH] control:Max. counterclockwise• Connect an SSG to the antennaconnector and set as:Frequency : 156.800 MHzLevel : 100 μV*(–67 dBm)Modulation : 1 kHzDeviation : ±3.5 kHz• Receiving• Operating channel : ch16• [SQUELCH] control:Max. counterclockwise• Connect an SSG to the antennaconnector and set as:Frequency : 156.800 MHzLevel : 0.22 μV*(–120 dBm)Modulation : 1 kHzDeviation : ±3.5 kHz• ReceivingADJUSTMENTADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUE POINTUNIT LOCATION UNIT ADJUST11MAINMAINConnect the distor-tion meter to the[EXT SP] jack with a4 Ω load.Connect a DC volt-meter to the checkpoint CP2.Less than 0.32 μV1.0 V MAINVerifyR16,*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.5-3 TRANSMITTER ADJUSTMENTSOUTPUTPOWERFREQUENCYDEVIATIONADJUSTMENTADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUE POINTUNIT LOCATION UNIT ADJUST11• Operating channel : ch16• Output power : High• Transmitting• Operating channel : ch16• Output power : Low• Connect an audio generator to J4(pin 3) on the MAIN unit with anAC millivoltmeter and set as:Frequency : 1 kHzLevel : 45 mV• Set an FM deviation meter as:HPF : OFFLPF : 20 kHzDe-emphasis : OFFDetector : (P–P)/2• TransmittingRearPanelRearPanelConnect an RFpower meter to theantenna connector.Connect an FMdeviation meter tothe antenna con-nector through anattenuator.26 W±4.3 kHzMAINMAINR71R138