Vertex Standard VX-2000U - User Manual

1
Introduction
This manual provides technical information necessary for servicing the VX-2000U UHF Land Mobile transceiver.
The VX-2000U 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-2000U 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. E095490A
Service Manual
VX-2000U
UHF 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 ...................................................... 55
DISPLAY-2 Unit ...................................................... 59
VR Unit..................................................................... 63
MIC Unit .................................................................. 64
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

Summary

Operational Procedures

Transmitting Operations

Scanning Functions

How to activate and use the radio's scanning modes.

The Four Scan Modes

Specifications

General Specifications

Frequency range, channels, stability, voltage, current, temp, size, weight.

Receiver Specifications

Transmitter Specifications

Front Panel Block Diagrams

VX-2000 U 4 ch Front Panel Block Diagram

Shows the block diagram for the 4-channel front panel.

VX-2000 U 40 ch Front Panel Block Diagram

Shows the block diagram for the 40-channel front panel.

Main Unit Block Diagram

Circuit Description

Receive Signal Path

Details the path of incoming RF signals through the receiver.

Transmit Signal Path

Details the path of audio signals during transmission.

PTT Transmit Activation

Explains how the PTT switch activates transmission.

Channel Selection and Display Circuits

Squelch Control Circuitry

Describes the squelch circuitry and its operation.

Transmitter Power and Inhibit Functions

Spurious Suppression and PLL Synthesizer

Minimizing spurious emissions and operation of the PLL frequency synthesizer.

Alignment Procedures

Required Test Equipment for Alignment

Lists the necessary test equipment for realignment procedures.

Alignment Preparation and Precautions

Covers pre-alignment steps and general precautions.

PLL VCV Performance Check

Checks the PLL Varactor Control Voltage for performance.

Receiver Squelch Threshold Setting

Sets the receiver squelch threshold.

Alignment Setup Configuration

Illustrates the typical alignment setup configuration.

PLL Reference Frequency Adjustment

Adjusts the PLL reference frequency.

Restore Original Channel Data

Instructions to reload original channel data after alignment.

Transmitter Output Power Adjustment

Procedure to set the transmitter output power.

Transmitter Deviation Adjustment

Procedure to set the transmitter deviation.

MAIN UNIT (Lot. 1-) CIRCUIT DIAGRAM

MAIN UNIT (Lot. 4-) CIRCUIT DIAGRAM

MAIN UNIT (Lot. 7-) CIRCUIT DIAGRAM

MAIN UNIT (Lot. 10-) CIRCUIT DIAGRAM

MAIN UNIT PARTS LIST

Display-1 Unit Circuit Diagram

Display-2 Unit Circuit Diagram

VR Unit Circuit Diagram

MIC Unit Circuit Diagram

Vertex Standard VX-2000U Specifications

General

Frequency Range	136-174 MHz
Channel Capacity	16 channels
Power Output	5W
Audio Output	500 mW
Channel Spacing	12.5/25 kHz
Mode	FM
Voltage	7.4 V DC
Antenna Connector	SMA
Battery	7.4V