Vertex Standard VX-2000V User Manual

1
Introduction
This manual provides technical information necessary for servicing the VX-2000V VHF Land Mobile transceiver.
The VX-2000V is carefully designed to allow the knowledgeable operator to make nearly all adjustments required for
various station conditions, modes and operator preferences simply from the controls on the panels, without opening the
case of the transceiver. The VX-2000V Operating Manual describes these adjustments, plus certain internal settings.
Servicing this equipment requires expertise in handling surface mount chip components. Attempts by non-qualified
persons to service this equipment may result in permanent damage not covered by warranty.
For the major circuit boards, each side of the board is identified by the type of the majority of components installed on
that side.
In most cases one side has only chip components, and the other has either a mixture of both chip and lead components
(trimmers, coils, electrolytic capacitors, packaged ICs, etc.), or lead components only.
While we believe the technical information in this manual is correct, Vertex Standard assumes no liability for damage
that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing out any
inconsistencies in the technical information would be appreciated. Vertex Standard reserves the right to make changes in
this transceiver and the alignment procedures, in the interest of technological improvement, without notification of the
owners.
©2003 VERTEX STANDARD CO., LTD. E095390A
Service Manual
VX-2000V
VHF Land Mobile Transceiver
Operating Manual Reprint............................ 2
Specifications................................................... 7
Exploded View & Miscellaneous Parts....... 8
Block Diagram ................................................. 9
Interconnection Diagram............................. 13
Circuit Description ...................................... 15
Alignment....................................................... 19
Contents
Board Unit ( Schematics, Layouts & Parts )
MAIN Unit ............................................................... 23
DISPLAY-1 Unit ...................................................... 49
DISPLAY-2 Unit ...................................................... 53
VR Unit ..................................................................... 57
MIC Unit .................................................................. 58
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
International Division
8350 N.W. 52nd Terrace, Suite 201, Miami, FL 33166, U.S.A.
YAESU EUROPE B.V.
P.O. Box 75525, 1118 ZN Schiphol, The Netherlands
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
40 channel version 4 channel version

Vertex Standard VX-2000V Specifications

General

Frequency Range	136-174 MHz
Channel Capacity	16
Voltage	13.6 VDC ±15%
Power Output	5W
Modulation	16K0F3E
Battery Life	10 hours
Channel Spacing	12.5/25 kHz

Summary

Introduction

Service Manual Overview

Provides technical information for servicing the VX-2000V VHF Land Mobile transceiver.

Controls and Connectors

Microphone Input

Connection point for the microphone.

4-Channel Front Controls

CHANNEL Numbered Indicators & Button for channel selection.

40-Channel Front Controls

CHANNEL Selector Buttons, Numeric Display, SEL/PRI, SCAN buttons.

Common Front Panel Controls

MONI, A Button, VOLUME/POWER Knob, TX/BUSY Lamp.

Status Indicators

P Indicator and E Indicator for status.

Rear Panel Connectors

Power Connector

Connects the supplied DC power cable to this 2-pin connector.

Antenna Socket

Connects the 50-ohm coaxial feedline using a "UHF" type plug.

External Speaker Jack

Connects an external loudspeaker via a 3.5-mm miniature phone jack.

DSUB 9-Pin Data Connector

Provides external audio, PTT, squelch, and receive audio signals.

Operation

Power ON/OFF

Turn the VOLUME/POWER knob clockwise to turn on the radio.

Channel Setting

How to change channels on 4-channel and 40-channel versions.

Volume Setting

Adjust volume using the VOLUME/POWER knob.

Transmitting Procedure

How to transmit using the PTT switch and TX/BUSY indicator.

Special Transmitter Functions

Busy Channel Lock-Out and Automatic Time-Out features.

Scanning Operation

Activating and configuring scanning modes.

User Programmable Channel Selections

Coded Squelch and MONI Button

Using the MONI button to defeat coded or noise squelch.

DSUB 9-Pin Data Connector Pinout

Pin Function Descriptions

Detailed functions for each pin of the DSUB connector.

Specifications

General Specifications

General specifications of the transceiver.

Receiver Specifications

Receiver performance specifications.

Transmitter Specifications

Transmitter performance specifications.

Exploded View and Parts

Exploded View and Parts List

Visual breakdown and parts list for the transceiver.

Block Diagrams

4-Channel Front Panel Block Diagram

Block diagram for the 4-channel front panel.

40-Channel Front Panel Block Diagram

Block diagram for the 40-channel front panel.

Main Unit Block Diagram

Main Unit Functional Blocks

Shows the functional blocks of the Main Unit.

Interconnection Diagrams

4-Channel Version Interconnection

Shows how the units connect for the 4-channel version.

40-Channel Version Interconnection

Shows how the units connect for the 40-channel version.

Circuit Description

Receive Signal Path

Traces the RF signal from antenna to audio output.

Squelch Control

Explains how the squelch circuitry operates.

Transmit Signal Path

Describes the signal path from microphone to antenna.

Transmitter Power & Control

Automatic power control, transmit inhibit, and spurious suppression.

PLL Frequency Synthesizer

Explanation of the Phase-Locked Loop circuitry.

PTT Transmit Activation

How the PTT switch activates transmission.

Channel Selection and Display

4-Channel Version Operation

CHANNEL button function for channel selection and display.

40-Channel Version Operation

UP/DOWN buttons function for channel selection and display.

Alignment Procedures

Required Test Equipment

List of necessary test equipment for alignment.

Alignment Preparation & Precautions

Steps before starting alignment, including software and temperature.

PLL VCV Performance Check

Checking the varactor control voltage for the PLL.

PLL Reference Frequency Adjustment

Adjusting TC1001 for PLL reference frequency.

Transmitter Output Power Adjustment

Adjusting VR1002/VR1003 for output power levels.

Transmitter Deviation Adjustment

Adjusting VR1001/VR1004 for deviation levels.

Receiver Squelch Threshold Adjustment

Adjusting VR1006 to set squelch threshold.

Restore Original Channel Data

Reloading original channel data after alignment.

Main Unit Circuit Diagrams and Layouts

Main Unit Circuit Diagram (Lot. 1~)

Schematic for the MAIN Unit (Lot. 1~).

Main Unit Parts Layout (Lot. 1~)

Component layout for the MAIN Unit (Lot. 1~).

Main Unit Circuit Diagram (Lot. 5~)

Schematic for the MAIN Unit (Lot. 5~).

Main Unit Parts Layout (Lot. 5~)

Component layout for the MAIN Unit (Lot. 5~).

Main Unit Circuit Diagram (Lot. 19~)

Schematic for the MAIN Unit (Lot. 19~).

Main Unit Parts Layout (Lot. 19~)

Component layout for the MAIN Unit (Lot. 19~).

Main Unit Parts List

Capacitors

List of capacitors for the MAIN Unit.

Diodes, Filters, Thermistors

List of diodes, filters, and thermistors for the MAIN Unit.

Connectors, Coils, Fuses, Ferrite Beads

List of connectors, coils, fuses, and ferrite beads for the MAIN Unit.

ICs and Transistors

List of ICs and transistors for the MAIN Unit.

Resistors (Pages 43-48)

List of resistors for the MAIN Unit.

Potentiometers, Crystals, Trimmers

List of potentiometers, crystals, and trimmers for the MAIN Unit.

Display-1 Unit

Display-1 Unit Circuit Diagram

Circuit diagram for the Display-1 Unit.

Display-1 Unit Parts Layout

Parts layout for the Display-1 Unit.

Display-1 Unit Parts List

Parts list for the Display-1 Unit.

Display-2 Unit

Display-2 Unit Circuit Diagram

Circuit diagram for the Display-2 Unit.

Display-2 Unit Parts Layout

Parts layout for the Display-2 Unit.

Display-2 Unit Parts List

Parts list for the Display-2 Unit.

VR Unit

VR Unit Circuit Diagram, Parts Layout, and List

Circuit Diagram, Parts Layout, and Parts List for the VR Unit.

MIC Unit

MIC Unit Circuit Diagram, Parts Layout, and List

Circuit Diagram, Parts Layout, and Parts List for the MIC Unit.