YAESU VX-5R Service Manual pages

50/144/430 MHz Triple-Band

Heavy Duty FM Transceiver

VX-5R

Technical Supplement

©2003 VERTEX STANDARD CO., LTD. E126990A

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

Introduction

This manual provides the technical information necessary for servicing the VX-5R Triple-Band Heavy Duty FM Transceiver.

Servicing this equipment requires expertise in handing 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 provided for each double-sided board in this transceiver. Each side of the board is referred to by the type of the majority of components installed on that side ("Side A" or "Side B"). 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 information in this manual to be correct, VER-

TEX 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.

Contents

Specification.......................................................................................................................................... 2

Exploded View & Miscellaneous Parts............................................................................................ 3

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

Interconnection Diagram.................................................................................................................... 6

Circuit Description ............................................................................................................................. 7

Alignment ............................................................................................................................................ 11

Board Unit (Schematics, Layouts & Parts)

CNTL Unit ......................................................................................................................................................................17

AF Unit ............................................................................................................................................................................35

RF Unit ............................................................................................................................................................................51

VCO Unit ........................................................................................................................................................................73

2

Specifications

General

Frequency Ranges:

Channel Steps:

Frequency Stability:

Repeater Shift (default):

Emission Type:

Antenna Impedance:

Supply Voltage:

Current Consumption:

Rx: 0.5 - 1.8 MHz (BC Band)

1.8 - 16 MHz (SW Band)

48 - 59 MHz (50 MHz HAM)

59 - 108 MHz (FM)

108 - 137 MHz (Air Band)

137 - 174 MHz (144 MHz HAM)

174 - 222 MHz (VHF-TV)

222 - 420 MHz (ACT1: Action Band 1)

420 - 470 MHz (430 MHz HAM)

470 - 729 MHz (UHF-TV)

800 - 999 MHz (ACT2: Action Band 2, Cellular Blocked)

Tx: 50 - 54 MHz

144 - 146 MHz or 144 - 148 MHz

430 - 440 MHz or 430 - 450 MHz

5/9/10/12.5/15/20/25/50/100 kHz

±5 ppm (–10°C to +60°C)

±600 kHz (144 MHz)

±1.6/5.0/7.6 MHz (430 MHz)

F2, F3

50 W

Nominal: 7.2 V DC, Negative Ground

Operating: 10 - 16 V DC, Negative Ground (EXT DC jack)

150 mA (Receive)

55 mA (Standby, Saver Off)

25 mA (Standby, Saver On)

400 µA (Auto Power Off)

1.6 A (5 W Tx, 50 MHz)

1.7 A (5 W Tx, 144 MHz)

1.9 A (4.5 W Tx, 430 MHz)

–20°C to +60°C

58 (W) x 88 (H) x 27 (D) mm (w/o knob & antenna)

255 g

Operating Temperature:

Case Size:

Weight:

Transmitter

RF Power Output:

Modulation Type:

Maximum Deviation:

Spurious Emission:

Microphone Impedance:

Receiver

Circuit Type:

Intermediate Frequencies:

Sensitivity:

Selectivity:

AF Output:

5 W (@ 13.8 V EXT DC IN)

5 W (@ 7.2 V, 50 MHz/144 MHz)

4.5 W (@ 7.2 V, 430 MHz)

Variable Reactance

±5 kHz

At least 60 dB below

2 kW

Double-Conversion Superheterodyne

service-repairmanual.com

45.8 MHz (W-FM)

2nd: 450 kHz (N-FM)

10.7 MHz (W-FM)

0.16 µV for 12 dB SINAD (50 - 54 MHz/144-148 MHz, N-FM)

0.9 µV for 12 dB SINAD (76 - 108 MHz/174 - 222 MHz, W-FM)

0.18 µV for 12 dB SINAD (430 - 450 MHz, N-FM)

3 µV for 12 dB SINAD (470 - 729 MHz, except 540-630 MHz, W-FM)

15 kHz/35 kHz (-6 dB/-60 dB: N-FM)

400 mW @ 8 W for 10 % THD (@ 7.2V DC)

Specifications are subject to change without notice, and are guaranteed within amateur bands only.

Interconnection Diagram service-repairmanual.com

6