Yaesu FT-891 Technical Supplement

Specications
Exploded View
Block Diagram
Connection Diagram
Alignment
Board Unit (Schematics, Layouts & Parts)
MAIN Unit
LOCAL Unit
PA Unit
DSP Unit
PANEL Unit
SW-A Unit
SW-B Unit
VR Unit
HF/50MHz TRANSCEIVER
FT-891
Introduction
This manual provides the technical information necessary
for servicing the FT-891 HF/50MHz TRANSCEIVER.
Servicing this equipment requires expertise in hand-
ing surface-mount chip components. Attempts by non-
qualied 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 provided for each double-
sided board in this transceiver. Each side of the board
is referred to by the type of the majority of components
installed on that side ("Side A" or "Side B"). 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 information in this manual to be
correct, YAESU 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.
Important Note
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 apparatus. The solder stated
above utilizes the alloy composition required for compliance with the lead-free specication, and any solder with the above alloy com-
position may be used.
Caution
Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries according to the instructions.
Contents
Technical Supplement
EH065H90D
©2017 YAESU MUSEN CO., LTD.

Yaesu FT-891 Specifications

General

Brand	Yaesu
Model	FT-891
Category	Transceiver
Language	English