SECTION 2 INSIDE VIEWS2 - 1• MAIN UNIT• FRONT UNIT2-1 IC-M402Reference oscillator(X2: CR-659)VCO circuitFM IF IC(IC1: TA31136FN)2nd IF filter(FI3: ALFY450E)1st mixer(Q1:3SK272)Antenna switching circuit1st IF filter(FI1,FI2,: FL-310)YGR amplifier(Q11: 2SC3268)DSC decoder(IC6: NJM2211M)AF power amplifier(IC9: LA4425A)Pre-driver(Q10: 2SC3775 3)PLL IC(IC2: MPD3140GS)EEPROM(IC2: HN58X2432TI)VR-A boardVR-B boardMAIN MPU(IC1: HD6473847RH)System clock(X1: CR-691)SpeakerReset IC(IC6: NJM2211M)LOGIC board

IC-M402

HM-127 (OPTIONAL UNIT)

LOGIC BOARD

MAIN UNIT

PLL CIRCUITS

HM-129

PORT ALLOCATIONS

PREPARATION

PLL ADJUSTMENTS

TRANSMITTER ADJUSTMENTS

front unit

Icom IC-M402 Service Manual

OPERATING RULES

I Panel description

I Function display

PANEL DESCRIPTION .................. 2

I Channel selection

I Microphone lock function

BASIC OPERATION ....................... 5

DUALWATCH/TRI-WATCH

I Setting tag channels

SCAN OPERATIONS .................... 9

I MMSI code programming

I Distress call

I Transmitting DSC calls

I DSC individual ID

I Receiving DSC calls

DSC OPERATION ....................... 11

I Intercom operation

I Set mode programming

set mode

MAINTENANCE

I Connections

I Mounting the transceiver

I MB-69 mounting bracket (Option)

I Receiving and transmitting

I Lock functions

I Display backlighting

I Starting a scan

I Channel names

I Installation

TROUBLESHOOTING

CHANNEL LIST

SPECIFICATIONS

I Dimensions

MB-69/HM-127 TEMPLATE

OPTIONS