Verizon VXA-220 Service Manual

Air Band Transceiver

VXA-220

Service Manual

2006 VERTEX STANDARD CO., LTD. (EC072N90A)

©

Introduction

This manual provides technical information necessary for servicing the VXA­220 Air Band 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.

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

VERTEX STANDARD (AUSTRALIA) PTY., LTD.

Normanby Business Park, Unit 14/45 Normanby Road
Notting Hill 3168, Victoria, Australia

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 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.

Important Note

This transceiver was assembled using Pb (lead) free solder, based on the RoHS specification.

Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this
apparatus. The solder stated above utilizes the alloy composition required for compliance with the lead-free
specification, and any solder with the above alloy composition may be used.

Contents

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

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

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

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

Alignment ..................................................................................................................................................................... 9

MAIN Unit Circuit Diagram .................................................................................................................................. 13

MAIN Unit Parts Layout ......................................................................................................................................... 15

MAIN Unit Parts List ............................................................................................................................................... 17

Specifications

General

Frequency Range: TX: 118.000 - 136.975 MHz,

RX: 108.000 - 136.975 MHz,

Weather Channels (WX-01 - WX-10: USA version only)

Channel Spacing: 25 kHz
Emission Type: TX: AM,

RX: AM & FM (FM: for receiving the Weather Channels, USA version only)

Supply Voltage: 6.0 - 15.0 VDC
Current Consumption (approx.): 250 μA (power off),

35 mA (battery saver on, saver ratio 1:5)
60 mA (squelch on),
200 mA (receive),
850 mA (transmit 1.5 W Carrier)

Temperature Range: +14 °F to + 140 °F (–10 °C to +60 °C)
Case Size (WxHxD): 2.36 x 4.09 x 1.2 inches (60 x 104 x 30.5 mm) w/o knob & antenna

service-repairmanual.com

Weight (approx.): 12.7 oz (360 grams) with FNB-83, antenna, and belt clip

Receiver

Circuit Type: Double-conversion superheterodyne
IFs: 47.25 MHz & 450 kHz
Sensitivity: AM: Better than 0.8 μV (for 6 dB S/N with 1 kHz, 30 % modulation)

FM; Better than 0.4 μV (for 12 dB SINAD)

Selectivity: More than 8 kHz/–6 dB
Adjacent CH. Selectivity: Less than 25 kHz/–60 dB
AF Output (Internal speaker): 0.7 W @ 16 Ohms, 10 % THD

Transmitter

Power Output (@ 7.2 V): 5 W (PEP), 1.5 W (Carrier Power)
Frequency Stability: Better than ±10 ppm (+14 °F to + 140 °F [–10 °C to +60 °C])
Modulation System: Low Level Amplitude Modulation
Spurious Emission: >60 dB below carrier
Int. Microphone Type: Condenser
Ext. Mic. Impedance: 150 Ohms

Specifications are subject to change without notice or obligation.

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