Equipment information

Yaesu FT-840 Transceiver
Manufacturer
Yaesu
Model FT-840
Date
Category: Radio, Communication
Group Transceiver
Description
Information
                                    

These manuals are available for the above equipment:

Manual Type Service Manual Yaesu-6230-Manual-Page-1-Picture
Pages 166
Size 8.20 Mbytes (8602472 Bytes)
Language english
Revision
Manual-ID/Number
Date
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 27f89f792fd6d6e5a5f572581da1f2b0
Downloads 548 since 27 July 2014
Information
Introduction & Chip Component Information................ 1-1

Circuit Board Access, Battery & Lamp Replacement............2-1

Alignment....................................3-1

Block Diagram & Interconnection Diagram.................4-1

Board Unit (Schematics, Layouts & Parts)

MAIN Unit ............................................5A-1

LOCAL Unit ...........................................SB-1

DDS-1 Unit ............................................5C-1

DDS-2 Unit............................................5D-1

OSC Unit .............................................5E1

REG Unit.............................................5F-1

DISPLAY Unit..........................................5G-1

LPF Unit..............................................5H-1

PA Unit .............................................. 51-1

VR-A/-B/-C/-D Unit........................................5J-1

SW-A/-B/-C/-D Unit.......................................5K-1

MIC Unit .............................................5L-1

PHONE Unit...........................................5M-1

Exploded View & Miscellaneous Parts .................... 6-1

Accessory & Optional Board Units (Schematics, Layouts & Parts)

TCXO-4 Master Reference Oscillator
(option).........................7A-1

FM Unit-747 (option).......................................7B-1

YF-112A AM Crystal Filter
(option)..............................7C-1

YF-112C CW Crystal Filter
(option)..............................7D-1

FC-10 Automatic Antenna Tuner
(option)...........................7E-1

MH-1B8 Hand-Held Microphone (accessory)
..........................7F-1

MD-1C8 Microphone (option)..................................7G-1

YH-77ST Lightweight Headphones
(option)...................*......7H-1


This manual provides the technical information necessary for
servicing the FT-840 hf transceiver. It does not include
information on specifications, installation and operation,
which are described in the FT-840 Operating Manual, provided
with the transceiver, or on FT-840 accessories, which are
described in the manuals provided with each.

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 warranty.

For the major circuit boards, each side of the board is
identified by the type of the majority of components
installed on that side. In most cases one side has only chip
components, and
the other has either a mixture of both chip and leaded
component (trimmers, coils, electrolytic capacitors,
packaged ICs, etc.), or leaded components only.
Yaesu-6230-Manual-Page-1-Picture


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