Equipment information:

Yaesu FT-747 Transceiver
Manufacturer:
Yaesu
Model: FT-747
Date:
Category: Radio, Communication
Group: Transceiver
Description:
Information:
                                    

These manuals are available for the above equipment:

Yaesu -- FT-747 -- Service Manual
File name: Yaesu-6225-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 26
Size: 15.58 Mbytes (16338990 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, reading partly badly, partly not readable.
Upload date:
MD5: 01f0ab8563d1411a0b58d629a8d08fed
ed2kID: eeba12558932f5f75ab86669df6e5a3c
Downloads: 821 since 27 July 2014
Information:
TOP COVER REMOVAL ........................... 2

EXPLODED VIEW...............................3

MAIN UNIT .................................4

Parts Layout	4

Circuit Diagram	5

FILTER UNIT.................................7

Parts Layout	7

Circuit Diagram	7

NB UNIT	.................................7

Parts Layout	7

Circuit Diagram	7

LOCAL UNIT .................................8

Parts Layout	8

Circuit Diagram	9

100W PA UNIT................................10

Parts Layout	10

Circuit Diagram	10

LPF UNIT .................................11

Parts Layout	11

Circuit Diagram	11

DISPLAY UNIT................................12

Parts Layout	12

Circuit Diagram	13

CONNECTION DIAGRAM..........................14

LEVEL DIAGRAM..............................15

Transmit	15

Receive	16

SIGNAL PATH................................17

SSB MODE .................................17

CW MODE .................................18

AM MODE .................................19

FM MODE .................................20

ALIGNMENT..................................21

I.	Local Unit	23

II.	Main Unit - Receiver	24

III.	Main Unit - Transmitter	26

IV.	Noise Blanker Unit	27

V.	100W PA Unit (Idling Current)	27

VI.	LPF Unit (CM Coupler Balance)	28

VII.	Main Unit (AFP - Automatic Final Protection) 28 PARTS
LIST     29

This manual is intended to serve as a supplement to the
FT-747GX Operating Manual. Detailed information regarding
functions, installation, interconnections and operation has
been provided in the Operating Manual, and is not reprinted
herein. Therefore, this supplement is not intended to serve
as an independent reference, but to be used in conjunction
with the information provided in the Operating Manual.

Because there are nearly two hundred and fifty semiconductor
devices in the FT-747GX, circuit description information is
provided in the form of numerous block diagrams. We hope
that this manner of providing functional information proves
to be more convenient for the owner and technician than
would a lengthy verbal description. Those readers unfamiliar
with the basic types of analog and digital circuits that
serve as the building blocks of the FT-747GX are encouraged
to study instructional material, such as that provided in
handbooks on amateur radio and digital circuit design,
before attempting to understand the design of the FT-747GX.
Each block in the block diagrams represents one such basic
circuit. General information on integrated circuits and
their applications is available in the data provided by the
1C manufacturers. Specific circuit details are provided in
the schematic diagrams in this manual.
Yaesu-6225-Manual-Page-1-Picture
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