266 DSC OPERATION Receiving DSC callsD Receiving a Distress callWhile monitoring Channel 70 and a Distress call is received:➥ The emergency alarm sounds for 2 minutes.• Push any key to stop the alarm.➥ “DSC” appears and “ ” scrolls at the channelcomment indicator, then Channel 16 is selected automati-cally.➥ Continue monitoring Channel 16 as a coast station may re-quire assistance.D Receiving a Distress AcknowledgementWhile monitoring Channel 70 and a Distress acknowledge-ment to other ship is received:➥ The emergency alarm sounds for 2 minutes.• Push any key to stop the alarm.➥ “DSC” appears and “ ” scrolls at thechannel comment indicator, then Channel 16 is selectedautomatically.D Receiving a Distress Relay callWhile monitoring Channel 70 and a Distress Relay acknowl-edgement is received:➥ The emergency alarm sounds for 2 minutes.• Push any key to stop the alarm.➥ “DSC” appears and “ ” scrolls at the channel com-ment indicator, then Channel 16 is selected automatically.D Receiving an Individual callWhile monitoring Channel 70 and an Individual call is received:➥ The emergency alarm or beeps sound for 2 minutes de-pending on the received category.• Push any key to stop the alarm or beeps.➥ “DSC” appears and “ ” scrolls at the chan-nel comment indicator.➥ Push [DSC•POS ] to reply the call and select the channelspecified by the calling station for voice communication (de-pending on your replying condition. See p, 18 for Individualacknowledgement call procedure for details.); push anyother key to ignore the call.ScrollsScrollsScrollsScrolls

OPERATING RULES

panel description

I Microphone

I Function display

basic operation

I Receiving and transmitting

I Call channel programming

I Channel comments

scan operation

I Setting TAG channels

I Operation

I MMSI code check

I DSC Address ID

i position indication

i distress call

I Transmitting DSC calls

dsc operation

transmitting a group call

transmitting an all ships call

I Receiving DSC calls

receiving a group call

other functions

I Public Address (PA) function

I Set mode items

set mode

I Fuse replacement

I Optional MB-69 installation

TROUBLESHOOTING

SPECIFICATIONS AND OPTIONS

i panel description

I Channel selection

I Lock functions

I Display backlight

I Starting a scan

I Set mode programming

I Intercom operation

I HM-157 supplied accessories

I Installation

CHANNEL LIST

TEMPLATE

Icom IC-M422 Instruction Manual

IC-M422

MAIN UNIT

LOGIC BOARD

TRANSMITTER CIRCUITS

PLL CIRCUITS

POWER SUPPLY CIRCUITS

PREPARATION

FREQUENCY ADJUSTMENT

TRANSMIT ADJUSTMENT

RECEIVE ADJUSTMENT

front unit

SQL BOARD

MECHANICAL PARTS AND DISASSEMBLY

VOLTAGE DIAGRAM