Contents
Specications
Exploded View & Miscellaneous Parts
Block Diagram
Alignment
Board Unit (Schematics, Layouts & Parts)
MAIN Unit
VHF FM Marine Transceiver
HX400
SERVICE MANUAL
EM039N95D
©2018 YAESU MUSEN CO., LTD.
Introduction
This manual provides the technical information necessary for servicing
the HX400 Transceiver.
Servicing this equipment requires expertise in handing surface-mount
chip components. Attempts by non-qualified persons to service this
equipment may result in permanent damage not covered by the war-
ranty, 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 typo-
graphical or other errors that may be present. Your cooperation in
pointing out any inconsistencies in the technical information would be
appreciated.
Important Note
1) This transceiver was assembled using Pb (lead) free solder, based
on the RoHS specication.
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 specication, and any solder with the above al-
loy composition may be used.
2) Risk of explosion if battery is replaced by an incorrect type. Dis-
pose of used batteries according to the instructions.
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General