Yaesu FT-1807M, Technical Supplement

Introduction

This manual provides technical information necessary for servicing the FT-1807M FM 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 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 compo-
nents (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.

©2006 VERTEX STANDARD CO., LTD.

EH023U90A

Technical Supplement

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

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

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

Connection Diagram .......................................... 6

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

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

Contents

Board Unit

 (Schematics, Layouts & Parts)

MAIN Unit Circuit Diagram ................................. 13
MAIN Unit Parts Layout ....................................... 15
MAIN Unit Parts List ............................................ 17
CNTL Unit Circuit Diagram .................................. 27
CNTL Parts Layout ............................................... 28
CNTL Parts List .................................................... 29

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

FM TRANSCEIVER

FT-1807M

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.