Yaesu FT-857 HF, Техническое дополнение

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1
Introduction
This manual provides technical information necessary for servicing the FT-857 HF/VHF/UHF Ultra-Compact Transceiver.
Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualified per-
sons 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, VERTEX STANDARD 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.
©2003 VERTEX STANDARD CO., LTD. EH007M90A
Technical Supplement
Specifications .................................................. 2
Exploded View & Miscellaneous Parts ...... 5
Connection Diagram ...................................... 7
Block Diagram ................................................. 8
Circuit Description ........................................ 9
Alignment ...................................................... 12
Contents
Board Unit
(Schematics, Layouts & Parts)
MAIN Unit ................................................................ 23
PLL Unit ..................................................................... 49
PA Unit ...................................................................... 55
PANEL Unit .............................................................. 67
REF Unit ..................................................................... 73
PHONE-JACK Unit .................................................. 74
VR Unit ...................................................................... 75
CONNECTOR Unit .................................................. 76
DSP-2 Unit (Option) ................................................. 77
TCXO-9 Unit (Option).............................................. 80
VERTEX STANDARD CO., LTD.
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VERTEX STANDARD
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International Division
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VERTEX STANDARD HK LTD.
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