Nokia 232, 239 Service Manual jbh1

After Sales Technical Documentation

CABLE JUNCTION BOX

JBH–1

Original, 05/94

NMP Part No. 0275009

Cable Junction Box JBH–1

AMENDMENT RECORD SHEET

After Sales

Technical Documentation

Amendment
Number

Date Inserted By Comments

Original, 05/94Page 2

After Sales
Technical Documentation

Cable Junction Box JBH–1

CABLE JUNCTION BOX JBH–1

CONTENTS

Page No

Introduction 5

Technical Summary 5
List of Modules 5

Technical Specifications 6

Modes of Operation 6

Phone Located Inside MBH–9 Holder 6

Phone Located Outside MBH–9 Holder 6
Extreme Conditions 6
Maximum Ratings 6
Control Signals 6
AC Characteristics 6
External Signals and Connections 6

HFJ Cable + Connector (Connector A) 7

Phone Connector X001 7

Coax Coil Cord Mini RF Connector 8
Mechanical Characteristics 8

Functional Description 8

Schematic 8

List of Figures

Figure 1: Schematic 9

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Cable Junction Box JBH–1

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Technical Documentation

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Technical Documentation

Cable Junction Box JBH–1

Introduction

The JBH–1 Cable Junction Box has been designed for use specifically with
the MBH–9 In–car Holder (to which it interfaces) and the existing Fixed Car

Kit (based on the HFJ–2 Handsfree Junction Box )

The JBH–1 enables the signals from the Coax Coil Cord, which plugs into the
Phone, to be split into audio and RF for connection to the HFJ–2 Handsfree
Junction Box (via the SCE–2 Front Mount Cable if the Booster is fitted) and
the Vehicle Antenna (via the XRH–1 RF extension Cable if the Booster is

fitted).

The JBH–1 Cable Junction Box enables the phone to access all the normal
features of the existing HFJ–2 Handsfree Junction Box, with the exception of

an External Audio Handset which is NOT specified for use with this phone.

Technical Summary

The JBH–1 Cable Junction Box is a passive device and therefore connects
directly between the phone and HFJ–2/SCE–2 and the Vehicle
Antenna/XRH–1. However, there is a PCB (DC8) contained within the
Accessory Connector upon which there is mounted a Reed Switch and a zero
Ohm resistor to act as a link, since the same DCX2 PCB is used in another
application. The Reed Switch is “pulled” by a Magnet located in the MBH–9
In–car Holder; its function is to signal to the phone whether it is located in the
holder or not. If the phone is located in the holder then it will operate in
“Handsfree” mode, if not then it will operate in “Handset” mode. The Reed
Switch is of the “Normally Open” type ie. it is closed by the MBH–9 magnet.

List of Modules

Name of Module Type Code Material Code Notes

Cable Junction Box JBH–1 0630008 Complete

Assembled Unit

Connector PCB

Module

HFJ Cable +

Connectors

DC8 0200377 Fits inside

accessory
connector

4C22080 7100422 NMP Cable used

on MCH–3

Assembly Parts MJBH1 0260336

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Cable Junction Box JBH–1

Technical Specifications

Modes of Operation

Phone Located Inside MBH–9 Holder

Phone operates in “Handsfree” mode and connected to external antenna.
Phone is charged by HFJ–2 through JBH–1.

Phone Located Outside MBH–9 Holder

Phone operates in “Handset” mode and connected to external antenna.
Phone is charged by HFJ–2 through JBH–1.

Extreme Conditions

After Sales

Technical Documentation

Storage Temperature:– –40°C + 85°C
Operating Temperature:– –30°C + 60°C
Absolute Maximum Current/pin:– 1 A

Maximum Ratings

Maximum Voltage at any pin to ground:– 50 V dc

Control Signals

Refer to External Signals and Connections section.

AC Characteristics

Not applicable since JBH–1 is a passive unit.

External Signals and Connections

A list of connectors is shown in the following table.

Connector Name Code Notes Specifications/

Ratings

HFJ–2 Connector Connector A 8 Pole
Phone Connector

(see X001)

RF signal from

phone to

Vehicle/Booster

antenna

Mini RF Connector

X001 10 Pole– mounted

on DC8 Module

Coax Coil Cord

2 Pole

PCB

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Technical Documentation

HFJ Cable + Connector (Connector A)

Signal Name Pin/Con Notes

XEXAUD/TXI 1 Booster Control. Active Low
DGND/PGND 2 Ground for Charger

M2BUS 3 Serial MBUS data between

VC 4 Supply Voltage/ charging current

HOOK 5 Handset Hook Indication

AGND/SGND 6 Audio Ground

XMIC/HFJCONN 7 Audio signal from HFJ–2, input to

XEAR/HFJPWR 8 Audio signal from phone to

Cable Junction Box JBH–1

phone, accessories and HFJ–2

for phone

phone

HFJ–2

Phone Connector X001

Signal Name Pin/Con Notes

VC 1 Supply Voltage/charging current

XEAUD 2 RF Booster PWM Control

HOOK 3 Indicates to the phone whether in

XEAR/HFJPWR 4 Audio signal from phone to

DGND 5 Digital Ground

VC 6 Supply Voltage/charging current

M2BUS 7 MBUS data between the phone,

AGND 8 Audio Ground

XMIC/HFJCONN 9 Audio signal from HFJ–2, input to

for phone

or out of MBH–9 In–car holder.

Line will be ”Low” when phone is

inside MBH–9, ”High” when out.

HFJ–2.

for phone

Accessories and HFJ–2.

phone.

DGND 10 Digital Ground

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Cable Junction Box JBH–1

Coax Coil Cord Mini RF Connector

Signal Name Pin/Conn Notes

RF Conductor Centre Pin RF Signal from phone to

RF Ground Shield RF Signal Ground

Mechanical Characteristics

After Sales

Technical Documentation

external Antenna

Connection

Unit Dimensions

(mm)

(WxHxD)

JBH–1 49x22x54 150 Antenna:0.30

Weight

(g)

Cable Length

(metres)

0.015

Audio:

1.450.05

Material/

Colour

JBH–1

Housings:

CYCOLOY C

1000HF–96127

Colour: Warm

Black

Functional Description

The DC8 PCB Module, located inside the accessory connector, contains a
Reed Switch, to signal to the phone whether or not it is located in the MBH–9
In–Car Holder; a connector (X001) which plugs into the bottom of the phone;
and a zero Ohm resistor which acts as a link, since the DC8 PCB (DCX2) is

used in another application.

The RF signal from the phone to the External Antenna or Booster is achieved
using a direct connection between the X001 Connector and the mini UHF
connector via the Coax Coil Cord. The mini UHF Connector mates with the

External Antenna Connector or the Booster XRH–1 Cable.

Schematic

The top–level schematic for JBH–1 is shown overleaf.

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After Sales
Technical Documentation

Figure 1: Schematic

Cable Junction Box JBH–1

Mini UHF
Connector

CONNECTOR A X001

X002_4 Vc

X002_1 XEXAUD/

TXI

X002_5 HOOK

X002_8 XEAR

X002_2 DGND/

PGND

X002_3 MBUS

X002_6 AGND/

SGND

X002_7 XMIC

CONNECTOR B

BROWN

ORANGE

VIOLET

GREEN

YELLOW

RED

BLACK

BLUE

W001

4

4

1

5

8

2

3

6

7

WHITE

1

GREEN

5

BLUE

8

YELLOW

2

BROWN

3

RED

6

BLACK

7

ORANGE

E1

E2

E3

E4

E8

E5

E6

E7

Mini RF
Connector

S1

R1

0R0

R2

N/F

R3
N/F

X1–1 VC

X1–2 XEXAUD

X1–3 HOOK

X1–4 XEAR

X1–5 DGND

X1–6 VC
X1–7 MBUS

X1–8 AGND

X1–9 XMIC

HFJ CABLE

(7100422)

W001

(970097)

X1–10 DGND

DC8 MODULE

(0200377)

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Technical Documentation

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