Yaesu FTDX1200 - User Manual

©2015 YAESU MUSEN CO., LTD.
Specications
Exploded View & Miscellaneous Parts
Block Diagram
Connection Diagram
Alignment
Board Unit (Schematics, Layouts & Parts)
MAIN Unit
CNTL Unit
LOCAL Unit
PA Unit
TUNER Unit
DSP Unit
DISPLAY-1 Unit
LED Unit
SW-A Unit
SW-B Unit
VR-A Unit
JACK Unit
MIC Unit
HF/50 MHz T
ransceiver
FT
DX
1200
Technical Supplement
EH058H90C
YAESU MUSEN CO., LTD.
Tennozu Parkside Building
2-5-8 Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-0002 Japan
YAESU USA
6125 Phyllis Drive, Cypress, CA 90630, U.S.A.
YAESU UK
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
Introduction
This manual provides technical information necessary
for servicing the FT
DX
1200 HF/50 MHz 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
components (trimmers, coils, electrolytic capacitors, ICs,
etc.), or leaded components only.
While we believe the technical information in this
manual to be correct, YAESU MUSEN 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
Important Note
1) This transceiver was assembled using Pb (lead) free solder, based on the RoHS specication.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this ap-
paratus. The solder stated above utilizes the alloy composition required for compliance with the lead-free
specication, and any solder with the above alloy composition may be used.
2) Risk of explosion if baery is replaced by an incorrect type. Dispose of used baeries according to the instruc-
tions.

Summary

Introduction

Contents

Lists the sections and topics covered in the manual.

Specifications

General

Covers general operating parameters such as frequency range and power consumption.

Transmitter

Details the technical specifications related to the transmitter section.

Receiver

Details the technical specifications for the receiver section.

Exploded View

Block Diagram

Connection Diagram

Alignment

Required Test Equipment

Lists the essential test instruments needed for proper alignment.

Alignment Preparation & Precautions

Covers crucial steps and safety measures before performing alignment.

VDD Meter Adjustment

TEMP;FAN Adjustment

SHIFT;WIDTH Knob Zero (Center) Adjustment

COMP Meter Adjustment

2 nd;3 rd Local Oscillator Adjustment

VCO Adjustment

REF OSC Adjustment

1 st LO Noise Adjustment

Main Receiver Adjustment

1 st Local Oscillator Adjustment

Procedure to adjust the first local oscillator level in the receiver.

2 nd Local Level Adjustment

3 rd Local Level Adjustment

IF Transformer Adjustment

MCF Adjustment (1)

IF Trap Adjustment

MCF Adjustment (2)

Noise Blanker Circuit Adjustment

RF AGC Adjustment

IF Gain Adjustment

S-meter Adjustment

FM Gain Adjustment

Transmitter Adjustment

TX IFT Adjustment

Procedure to adjust transmitter intermediate frequency transformers.

PA Unit Adjustment

Preparation

Steps to prepare the PA Unit for adjustments.

Pre-Drive Stage Idling Current Adjustment

Adjusts the idling current for the pre-drive stage.

Drive Stage Idling Current Adjustment

Adjusts the idling current for the drive stage.

Final Stage Idling Current Adjustment

Termination

Antenna Tuner Adjustment

CM Coupler Balance Adjustment

Adjusts the balance of the CM coupler in the antenna tuner.

Current ALC Adjustment

ALC Meter Adjustment

FM MAX Deviation Adjustment

TX Output Power;PO Meter;TXG Adjustment

AM-TXG Adjustment

REV-ALC Adjustment

FM MAX Deviation Adjustment

SWR Meter Adjustment

IDD Meter Adjustment

MAIN Unit Circuit Diagram

MAIN Unit Parts Layout (side A)

MAIN Unit Parts Layout (side B)

MAIN Unit Parts List

CNTL Unit (Lot. 1~3) Circuit Diagram

CNTL Unit (Lot. 1~3) Parts Layout

CNTL Unit (Lot. 4~) Circuit Diagram

CNTL Unit (Lot. 4~) Parts Layout

CNTL Unit Parts List

LOCAL Unit Circuit Diagram

LOCAL Unit Parts Layout (Side A)

LOCAL Unit Parts Layout (Side B)

LOCAL Unit Parts List

PA Unit Circuit Diagram

PA Unit Parts Layout (side A)

PA Unit Parts Layout (side B)

PA Unit Parts List

TUNER Unit (Lot. 1~2) Circuit Diagram

TUNER Unit (Lot. 1~2) Parts Layout

TUNER Unit (Lot. 3~) Circuit Diagram

TUNER Unit (Lot. 3~) Parts Layout

TUNER Unit Parts List

DSP Unit Circuit Diagram

DSP Unit Parts Layout (Side A)

DSP Unit Parts Layout (Side B)

DSP Unit Parts List

DISPLAY-1 Unit Circuit Diagram

DISPLAY-1 Unit Parts Layout (Side A)

DISPLAY-1 Unit Parts Layout (Side B)

DISPLAY-1 Unit Parts List

LED Unit Circuit Diagram

LED Unit Parts Layout

LED Unit Parts List

SW-A Unit Circuit Diagram

SW-A Unit Parts Layout

SW-A Unit Parts List

SW-B Unit Circuit Diagram

SW-B Unit Parts Layout

SW-B Unit Parts List

VR-A Unit Circuit Diagram

VR-A Unit Parts Layout

VR-A Unit Parts List

JACK Unit Circuit Diagram

JACK Unit Parts Layout

JACK Unit Parts List

MIC Unit Circuit Diagram

MIC Unit Parts Layout

MIC Unit Parts List

Yaesu FTDX1200 Specifications

General

Type	HF/50 MHz Transceiver
Impedance	50 Ohms
Supply Voltage	13.8 V DC ±15%
IF DSP	Yes
Antenna Connector	SO-239
Modes	SSB, CW, AM, FM
Current Consumption	22 A
Display	TFT
Receiver Sensitivity	0.2 μV