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Kenwood NX-820H User Manual

Kenwood NX-820H
89 pages
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This product complies with the
RoHS
directive for the European market.
This product uses Lead Free solder.
SERVICE MANUAL
© 2012-9 PRINTED IN JA PAN
B53-7033-00
(
Y
)
672
NX-820H(G)/820H
UHF DIGITAL TRANSCEIVER
CONTENTS
Panel assy
(A62-1200-03)
Badge
(B43-1675-04)
Key top
(K29-9479-01)
Modular jack
(E58-0535-05)
GENERAL ....................................................2
SYSTEM SET-UP .........................................4
REALIGNMENT ...........................................4
INSTALLATION ............................................ 7
DISASSEMBLY FOR REPAIR .....................9
CIRCUIT DESCRIPTION ...........................11
COMPONENTS DESCRIPTION ................17
PARTS LIST ...............................................19
EXPLODED VIEW ......................................29
PACKING ...................................................30
TROUBLE SHOOTING ..............................31
ADJUSTMENT ...........................................35
TERMINAL FUNCTION .............................56
PC BOARD
DISPLAY UNIT (X54-3830-10) ...............60
TX-RX UNIT (X57-8240-1X)....................62
INTERCONNECTION DIAGRAM ...............66
SCHEMATIC DIAGRAM ............................67
BLOCK DIAGRAM .....................................78
LEVEL DIAGRAM ......................................81
OPTIONAL ACCESSORIES
KRA-40 ..................................................82
SPECIFICATIONS .................BACK COVER
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Kenwood NX-820H Specifications

General IconGeneral
Power Output5W
Operating Temperature-30°C to +60°C
Digital ProtocolNXDN
GPSOptional
BluetoothNo
IP RatingIP54/55
Battery Life14 hours
Zones16 zones
Channel Spacing12.5 kHz / 25 kHz
Channel Capacity260

Summary

GENERAL

INTRODUCTION AND SAFETY

Describes the manual's purpose, part ordering, and safety precautions.

PRE-INSTALLATION CONSIDERATIONS

Outlines steps before unit installation.

RADIO INSTALLATION PLANNING

Covers radio placement, DC power, and antenna system.

SYSTEM SET-UP

MODES OF OPERATION

Lists and describes different operational modes (User, PC, Clone, etc.).

ENTERING OPERATIONAL MODES

Explains how to access various transceiver modes.

REALIGNMENT

PANEL TEST MODE PROCEDURE

Details steps for entering and using panel test mode.

PC MODE CONNECTION AND SOFTWARE

Explains PC connection, interface cables, and programming software.

FIRMWARE PROGRAMMING MODE

Outlines the process for updating transceiver firmware.

CLONE MODE OPERATION

Describes transferring data between transceivers.

INSTALLATION

KCT-60 CONNECTION CABLE

Details the KCT-60 connection cable kit.

HORN ALERT AND IGNITION SENSE

Explains horn alert and ignition sense functions.

EXTERNAL SPEAKER KES-5

Details the KES-5 external speaker connection.

SERIAL PORT AND SIGNAL TYPE CONFIGURATION

Covers serial port level and signal type changes.

DISASSEMBLY FOR REPAIR

INITIAL DISASSEMBLY STEPS

Covers cabinet and panel removal procedures.

PCB AND COMPONENT REMOVAL

Details removing the TX-RX PCB and related components.

REASSEMBLY PRECAUTIONS AND LED REPLACEMENT

Discusses reassembly steps and LED handling.

CIRCUIT DESCRIPTION

OVERVIEW AND FREQUENCY CONFIGURATION

Introduces the unit and its operating frequencies.

RECEIVER SYSTEM RF AND IF CIRCUITS

Describes the receiver RF and IF stages.

AUDIO, SQUELCH, TRANSMITTER, AND PLL SYSTEMS

Details audio, squelch, transmitter, and PLL circuit blocks.

POWER SUPPLY, SIGNALING, COMPANDER, AND GPS CIRCUITS

Explains power supply, signaling, compander, and GPS sections.

COMPONENTS DESCRIPTION

DISPLAY UNIT COMPONENTS

Details components used in the display unit.

TX-RX UNIT COMPONENTS

Lists components found on the TX-RX unit.

PARTS LIST

DISPLAY UNIT PARTS

Lists components for the display unit.

TX-RX UNIT PARTS

Lists components for the TX-RX unit.

EXPLODED VIEW

DISPLAY UNIT EXPLODED VIEW

Illustrates the assembly of the display unit.

TX-RX UNIT EXPLODED VIEW

Shows the exploded view of the TX-RX unit.

PACKING

ACCESSORIES PACKING

Shows the packaging of included accessories.

MAIN UNIT PACKING

Illustrates how the main transceiver unit is packed.

TROUBLE SHOOTING

BGA IC FAULT DIAGNOSIS

Focuses on diagnosing problems with BGA integrated circuits.

POWER SUPPLY, CLOCK, AND RESET CHECKS

Details checks for power, clock, and reset signals.

ASIC OUTPUT, PANEL CONTROL, AND ERROR DISPLAYS

Covers ASIC output, panel control, and error displays.

GPS SECTION DIAGNOSIS AND TX-RX UNIT REPLACEMENT

Guides GPS troubleshooting and TX-RX unit replacement.

ESN MANAGEMENT AND LABELING

Covers ESN confirmation, data writing, and label attachment.

ADJUSTMENT

PANEL TEST MODE OPERATION

Explains how to enter and use the panel test mode.

FREQUENCY AND ANALOG MODE SIGNALING

Details frequency settings and analog mode signaling parameters.

TRANSCEIVER TUNING AND PANEL ADJUSTMENTS

Covers tuning modes and reference level frequency adjustments.

DEVIATION AND SIGNALING ADJUSTMENTS

Details maximum deviation and signaling tone adjustments.

RECEIVER SECTION ADJUSTMENTS

Covers AF level, RSSI, and squelch adjustments.

TEST EQUIPMENT AND CABLES

REQUIRED TEST EQUIPMENT

Details the specifications for alignment test gear.

MICROPHONE AND TUNING CABLES

Describes essential connection cables for testing.

RADIO CHECK PROCEDURES

FREQUENCY, POWER, AND SENSITIVITY CHECKS

Outlines steps for frequency, power, and sensitivity checks.

COMMON SECTION AND SENSITIVITY ADJUSTMENTS

Covers general settings, receive/transmit assist, and sensitivity.

TERMINAL FUNCTION

DISPLAY AND TX-RX UNIT TERMINALS

Details pin assignments and functions for both units.

MODULAR AND D-SUB CONNECTOR SPECIFICATIONS

Provides detailed specifications for key connectors.

PC BOARD LAYOUT

DISPLAY UNIT LAYOUTS

Shows component placement for the display unit.

TX-RX UNIT LAYOUTS

Illustrates component placement for the TX-RX unit.

INTERCONNECTION DIAGRAM

DISPLAY UNIT TO TX-RX UNIT CONNECTION

Shows the primary connection between the display and TX-RX units.

SCHEMATIC DIAGRAM

TX-RX UNIT SCHEMATIC

Details the electronic schematics for the TX-RX unit.

BLOCK DIAGRAM

SYSTEM FUNCTIONAL BLOCK DIAGRAM

Illustrates the interconnections between major functional units.

LEVEL DIAGRAM

RECEIVER AND TRANSMITTER SIGNAL LEVELS

Shows typical signal levels for RF, IF, and AF stages.

OPTIONAL ACCESSORIES

KRA-40 GPS ACTIVE ANTENNA

Provides specifications for the KRA-40 GPS antenna.

SPECIFICATIONS

GENERAL SPECIFICATIONS

Lists general operating parameters like frequency range and voltage.

RECEIVER AND TRANSMITTER SPECIFICATIONS

Details receiver sensitivity and transmitter RF power.

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