User Guide

INSTALLATION

INSTRUCTIONS

9617ARo

4–8

NHC–4

Technical Documentation

Power Cable (PCH–4)

The power cable includes supply wires, ignition sense and car radio muting.

The power cables are connected directly to the vehicles battery via fuses, red

wire to the positive pole (+12 V) and black one to the negative pole (GND), un-

less vehicle has other main voltage than 12 V. The last 1 m part of the cable is

connected by using standard grimp–connectors, which makes power cable

routing from the battery easier. For additional information see section ”Power

Distribution”

The yellow wire is used for car radio muting (XCRM). The line goes down to 0

volts during a call. The maximum sink current is 250 mA, hence the actual mut-

ing operation must be done by using an auxiliary relay, or a muting unit pro-

vided by the manufacturer, see ”Car Radio Muting”.

The blue ignition sense (IGNS) wire is connected to +12 V voltage controlled by

the car ignition key. The ignition sense can utilize voltages up to 24 V, see sec-

tion ”Ignition Sense”

Handset (HSU–1)

An optional handset offers more privacy during the call. The holder is attached

with mounting plate MKE–1 or swivel HHS–1.

Modular 8 Pin Extension Cable (SCE–4)

This cable provides an extension between the HFJ–3 and MCH–4.

SCE–4