Yaesu FT-450/D User Manual

Introduction
This manual provides technical information necessary
for servicing the FT-450/D HF/50 MHz Transceiver.
Servicing this equipment requires expertise in handling sur-
face-mount chip components. Attempts by non-qualified per-
sons 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 re-
ferred to by the type of the majority of components in-
stalled 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 lead-
ed components only.
While we believe the technical information in this manu-
al to be correct, VERTEX STANDARD assumes no liabili-
ty for damage that may occur as a result of typographi-
cal or other errors that may be present. Your cooperation
in pointing out any inconsistencies in the technical infor-
mation would be appreciated.
©2011 VERTEX STANDARD CO., LTD.
Technical Supplement
HF/50 MHz TRANSCEIVER
FT-450/D
Contents
Specifications
Exploded View & Miscellaneous Parts
Block Diagram
Connection Diagram
Alignment
Board Unit (Schematics, Layouts & Parts)
RF-IF Unit
PANEL Unit
CNTL Unit
PA Unit
TUNER Unit (FT-450 Option:ATU-450 )
EH024H90D
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 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
FT-450
FT-450D

Yaesu FT-450/D Specifications

General

Receiver Type	Triple-conversion superheterodyne
Supply Voltage	13.8 V DC ±15%
Current Consumption Max	22 A
Frequency Range Receive	30 kHz - 56 MHz
Modes	SSB, CW, AM, FM
Power Output	100 W
Antenna Impedance	50 Ohms
Current Drain Transmit	22 A
Weight	3.6 kg
Output Power 50MHz	100 W

Summary

Introduction to the FT-450/D Technical Supplement

FT-450D Transceiver Specifications

General Specifications

General operating and physical specifications for the transceiver.

Transmitter Specifications

Technical parameters of the transmitter section.

Receiver Specifications

Technical parameters of the receiver section.

FT-450D Exploded View, Diagrams, and Unit Details

Exploded View & Miscellaneous Parts

Visual breakdown of transceiver components and their layout.

Block Diagram

High-level functional overview of the transceiver's internal architecture.

Connection Diagram

Schematic showing how internal units and external connections interface.

Unit Schematics, Layouts, and Parts Lists

Detailed circuit diagrams, parts layouts, and component lists for each unit.

FT-450D Alignment and Adjustment Procedures

Alignment Introduction and Precautions

Essential safety and procedural guidelines before alignment.

Required Test Equipment for Alignment

List of specialized tools and instruments needed for calibration.

Alignment Preparation and Precautions

Specific steps and environmental conditions for proper alignment.

IF Circuit Alignment

Calibration steps for the Intermediate Frequency circuits (SSB/CW and FM).

PA Unit Alignment Procedures

Procedures for adjusting the Power Amplifier stages and currents.

Software and Control Adjustments

Calibration and configuration steps via software and controllers.

Transmitter Power and Gain Adjustments

Setting transmitter power levels, gain, and carrier adjustments.

ALC and Reverse ALC Adjustments

Calibrating Automatic Level Control and reverse ALC.