Vertex Standard VX-2500U Manuale utente

UHF FM Transceiver

VX-2500U

Service Manual

Introduction

This manual provides technical information necessary for servicing the VX-2500U Transceiver.

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 the warranty, and may be illegal in

some countries.

Two PCB layout diagrams are provided for each double-sided circuit board in the transceiver. Each side of thr board is

referred to by the type of the majority of components installed on that side (“leaded” or “chip-only”). In most cases one

side has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils,

electrolytic capacitors, ICs, etc.), or leaded components only.

While we believe the technical information in this manual to be correct, Vertex Standard assumes no liability for dam-

age 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.

Specifications ..................................................... 2

DSUB 9-pin Accessory Connector .................. 3

Exploded View & Miscellaneous Parts ......... 4

Block Diagram .................................................... 5

Interconnection Diagram ................................. 9

Circuit Description .......................................... 11

Contents

Alignment ......................................................13

RF Unit Jumper Information ......................23

Clone ...............................................................24

Board Unit (Schematics, Layouts & Parts)

RF Unit .......................................................................... 25

RF-1- Unit ...................................................................... 43

RF-2- Unit ...................................................................... 57

Panel Unit ..................................................................... 69

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.

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

General

Frequency range: 400-470 MHz (Ver. CS1)

450-490 MHz (Ver. D)

450-520 MHz (Ver. DS1)

Number of Groups:10

Number of Channels : 128 channels

PLL Steps: 5.0 kHz/6.25kHz

Power Supply Voltage: 13.8V DC ±15 %

Channel Spacing: 12.5 / 25.0 kHz

Current Consumption (Approx.): TX: 6 A

RX: 700 mA

STBY: 250 mA

Operating Temperature range: –22 °F to 140 °F (–30 °C to +60 °C)

Frequency Stability: Better than ±2.5 ppm

RF Input-Output Impedance: 50 ohms

Audio Output Impedance: 4 ohms

Dimensions: 6.3 x 1.6 x 4.3 inch (160 x 40 x 110 mm)

Weight (Approx.): 1.87 lb (0.85 kg)

Receiver (Typical Values)

Circuit type: Double conversion Super-heterodyne

Sensitivity: 0.25 uV (12 dB SINAD)

Adjacent Channel Selectivity: 80/67 dB

Intermodulation: 75 dB

Spurious and Image Rejection: 90 dB

Audio Output: 4 W @ 4 ohms 5% THD

Audio Distortion: <3 % @1 kHz

Transmitter (Typical Values)

Power Output: 25 W (low: 5W)

Modulation: 16K0F3E, 11K0F3E

Max Deviation: 5.0/2.5 kHz

Conducted Spurious Emission: 70 dB below carrier

Audio Distortion: <3 % @ 1 kHz

Microphone type: Dynamic

Microphone impedance: 600 ohms

Specifications

DSUB 9-pin Accessory Connector

Pin 1: Output Logic squelch (Will be effective this output during Data transmission – Inputting logic Low

level signal to the Pin #4 as the DTR signal)

High: Radio receiving the signal with the correct CTCSS, DCS, or LTR ID.

Low: Radio not receiving the signal with the correct CTCSS, DCS, or LTR ID.

Pin 2: Output Rx discriminator (Need to set the solder short on the PCB)

JP3 (JP1503) - Flat: 10 Hz to 3.0 kHz (140 mVrms / STD deviation with 600 ohm termination)

JP4 (JP1504) - Filtered 300 Hz to 3.0 kHz (70 mVrms / STD deviation with 600 ohm termination)

* Both JP3 and JP4 are not closed from the factory.

Pin 3: Input TX data to the radio modulator. (Flat: 10 Hz to 3.0 kHz)

(40 mVrms / STD deviation)

Pin 4: Input DTR (to switch the radio operation between dispatch operation and Data mode)

[DTR Low: Turn on the Data transmission, less than 0.5 V]

[DTR High: Turn off the Data transmission, more than 4.0 V]

Pin 5: Ground

Pin 6: Output Horn alert signal (Open collector with maximum 16.0 V, 100 mA sink).

Pin 7: Input external PTT (effective when in the Data mode)

[Low: Request the transmission]

[High: Request the Receiving]

Pin 8: Output supply voltage (Need to set the solder short on the PCB)

JP1 (JP1501) Output 5.0 V (Maximum 100 mA output)

JP2(JP1502) Output 13.8 V (Maximum 100 mA output)

* Both JP1 and JP2 are not closed from the factory.

Pin 9: Input the ignition signal of the CAR.

This signal is for the following operation,

(1) Disable the Horn alert during the ignition is turned on.

(2) Turn on and off the radio. This function requires the solder short JP8 (JP1508).

Exploded View & Miscellaneous Parts

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CASE

RA0060100

SHIELD GASKET (Ver. D)

S5000238

SPONGE RUBBER (SHIELD)

(Ver. D)

RA0365500

BLIND SEET (70 x 10)

RA0365500

BLIND SEET (4 x 3)

RA0405200

SP HOLDER

RA0378300

SPONGE RUBBER

RA0383600

PANEL ASSY

RA0376000

VOL KNOB

RA0377000

TUBE

RA0392000

CHASSIS

RA005600C

GAP PAD

S6000379

SUPPORT

RA0060700

PM HOLDER

RA0066400

FERRITE BEADS

L9190001

WIRE ASSY

T9206633

SPEAKER

M4090154

BLIND SEET (4 x 3)

RA0405200

WIRE ASSY

T9206979

PANEL UNIT

MAIN UNIT

CONNECTOR

P1090984

CONNECTOR

P1090654

WIRE ASSY

T9206634A

G1093909 (Ver. CS1)

G1093885 (Ver. D, DS1)

REF.

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QTY.

DESCRIPTION

BINDING HEAD SCREW M2.6 x 6 NI

BINDING HEAD SCREW M3 x 6 NI

BINDING HEAD SCREW M3 x 8 NI

TAPTITE SCREW M3 x 6 NI

TAPTITE SCREW M3 x 8

OVAL HEAD SCREW M2.6 x 6 B

VXSTD P/N

U20206002

U20306002

U20308002

U24306002

U24308001

U31206007

SHIELD GASKET (Ver. CS1, DS1)

RA0515100

SPONGE

RA0460200

SHIELD SHEET

(Ver. CS1, DS1)

RA0513400

BLIND SHEET (34 x 8) (Lot. 1~4)

RA0404900

BLIND SHEET (4 x 25) (Lot. 1~3)

RA0425500

BLIND SHEET (35 x 4) (Lot. 1~4)

RA0405000

SHIELD GASKET

RA0517900

(Ver. CS1, DS1)

Block Diagram (1)

Block Diagram (2)

Block Diagram (3)

Block Diagram (4)

Interconnection Diagram

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