FT-857 Service Manual.pdf

FT-857/-857D

VERTEX STANDARD CO., LTD.

4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan

VERTEX STANDARD

US Headquarters

10900 Walker Street, Cypress, CA 90630, U.S.A.

YAESU EUROPE B.V.

P.O. Box 75525, 1118 ZN Schiphol, The Netherlands

YAESU UK LTD.

Unit 12, Sun Valley Business Park, Winnall Close

Winchester, Hampshire, SO23 0LB, U.K.

VERTEX STANDARD HK LTD.

Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,

Kwun Tong, Kowloon, Hong Kong

Technical Supplement

EH007M90B

Introduction

This manual provides technical information necessary for servicing the FT-857/-857D HF/VHF/UHF Ultra-Compact Trans-

ceiver.

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.

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 ..................................................................... 57

PA Unit ....................................................................... 67

PANEL Unit ............................................................... 81

REF Unit ..................................................................... 87

PHONE-JACK Unit ................................................... 88

VR Unit ....................................................................... 89

CONNECTOR Unit ................................................... 90

DSP-2 Unit (FT-857 Option) .................................... 91

TCXO-9 Unit (Option) .............................................. 94

Specifications

General

Frequency Range :

Receive: 0.1-56 MHz, 76-108 MHz, 118-164 MHz, 420-470 MHz

Transmit: 160 - 6 Meters, 2 Meters, 70 Centimeters (Amateur bands only)

Emission Modes :

A1 (CW), A3 (AM), A3J (LSB/USB), F3 (FM),

F1 (9600 bps packet), F2 (1200 bps packet)

Synthesizer Steps (Min.):

10 Hz (CW/SSB), 100 Hz (AM/FM/WFM)

Antenna Impedance :

50 Ohms, Unbalanced

Operating Temp. Range :

14 °F to 140 °F (–10 °C to +60 °C)

Frequency Stability :

±4 ppm from 1 min. to 60 min after power on. @25 °C: 1 ppm/hour

±0.5 ppm/1 hour @25 °C, after warmup (with optional TCXO-9)

Supply Voltage :

Normal: 13.8 VDC ±15 %, Negative Ground

Current Consumption :

Squelched: 550 mA (Approx.)

Receive: 1 A

Transmit: 22 A

Case Size (W x H x D):

6.1” x 2.0” x 9.2” (155 x 52 x 233 mm)

Weight (Approx.):

4.6 lb. (2.1 kg)

Transmitter

RF Power Output :

SSB/CW/FM

AM Carrier

(@13.8 V DC)

160- 6 M:

100 W

25 W

2 M:

50 W

12.5 W

70 CM:

20 W

5 W

Modulation Types : SSB: Balanced Modulator,

AM: Early Stage (Low Level),

FM: Variable Reactance

FM Maximum Deviation : ±5 kHz (FM-N: ±2.5 kHz)

Spurious Radiation : –50 dB (1.8-29.7 MHz)

–60 dB (50/144/430 MHz)

Carrier Suppression : >40 dB

Opp. Sideband Suppression : >50 dB

SSB Frequency Response :

400 Hz-2600 Hz (–6 dB)

Microphone Impedance :

200-10k Ohms (Nominal: 600 Ohms)

Specifications

Receiver

Circuit Type :

Double-Conversion Superheterodyne (SSB/CW/AM/FM)

Superheterodyne (WFM)

Intermediate Frequencies :

1st: 68.33 MHz (SSB/CW/AM/FM); 10.7 MHz (WFM)

2nd: 455 kHz

Sensitivity :

SSB/CW AM FM

100 kHz-1.8 MHz – 32 µV –

1.8 MHz-28 MHz 0.2 µV 2 µV –

28 MHz-30 MHz 0.2 µV 2 µV 0.5 µV

50 MHz-54 MHz 0.125 µV 1 µV 0.2 µV

144/430 MHz 0.125 µV – 0.2 µV

(SSB/CW/AM = 10 dB S/N, FM = 12 dB SINAD)

Squelch Sensitivity :

SSB/CW/AM

100 kHz-1.8 MHz

–

1.8 MHz-28 MHz

2.5 µV

–

28 MHz-30 MHz

2.5 µV

0.32 µV

50 MHz-54 MHz

1 µV

0.16 µV

144/430 MHz

0.5 µV

0.16 µV

Image Rejection : HF/50 MHz: 70 dB,

144/430 MHz: 60 dB

IF Rejection : 60 dB

Selectivity (–6/–60 dB): SSB/CW: 2.2 kHz/4.5 kHz

AM: 6 kHz/20 kHz

FM: 15 kHz/30 kHz

FM-N: 9 kHz/25 kHz

SSB (optional YF-122S installed): 2.3 kHz/4.7 kHz (–66 dB)

CW (option YF-122C installed): 500 Hz/2.0 kHz

CW (option YF-122CN installed): 300 Hz/1.0 kHz

AF Output : 2.5 W (@4 Ohms, 10% THD or less)

AF Output Impedance : 4-16 Ohms

Specifications are subject to change without notice, and are guaranteed within the amateur bands only.

Note

Exploded View & Miscellaneous Parts

Non-designated parts are available only as part of a designated assembly.

Ref. VXSTD P/N Description Qty

1 U00315007 PAN HEAD SCREW M3X15B 4

2 U02208002 PAN HEAD SCREW SM2.6X8NI 2

3 U02306002 SEMS SCREW SM3X6NI 6

4 U20304007 BINDING HEAD SCREW M3X4B 2

5 U24104001 TAPTITE SCREW M2X4

RA0471400

SPONGE (B)

RA0459600

TOP CASE

6 U24105001 TAPTITE SCREW M2X5

7 U24205001 TAPTITE SCREW M2.6X5

MAIN UNIT

8 U24206003 TAPTITE SCREW M2.6X6NIB

9 U24210007 TAPTITE SCREW M2.6X10B

RA0257600

SP NET

RA0453200

GASCKET (SHIELD)

10 U24306002 TAPTITE SCREW M3X6NI

11 U31205007 OVAL HEAD SCREW M2.6X5B

RA0489500

SPONGE RUBBER (DSP)

RA0398100

SPONGE RUBBER (SP)

12 U43110007 TAPTITE SCREW M2X10B

P1090352

CONNECTOR

RA0428700

CHASSIS

M40900150

SPEAKER

T9207004

WIRE ASSY

RA0283900

SPONGE RUBBER (SP-B)

CONNECTOR UNIT

RA0413400

SP HOLDER

P1090352 (TYPE "M")

P1090547 (TYPE "N")

CONNECTOR

RA0483900

SPONGE RUBBER (SP-C)

T9207023

WIRE ASSY

RA0484500

SHEET (ANT)

M2090036

FAN

M2090036

FAN

RA0450600 (Lot. 1~2)

RA045060A (Lot. 3~)

SUB PANEL

T9101530

CT CABLE

RA0450500

REAR PANEL

RA0489800

SPONGE RUBBER (TX)

PA UNIT

T9207025

WIRE ASSY

RA0450900

LCD HOLDER

RA0481000

SHEET (LCD)

RA0451100

KNOB ASSY (MODE)

RA0485400

LIGHT SHEET (B)

RA0450800

HOLDER (MODE)

T9207026

WIRE ASSY

R0137551

COIL SPRING

RA0451000

LIGHT GUIDE (LCD)

Q9000709A

ROTARY ENCODER

R0450700

RELEASE KNOB

S5000240

SPACER

RA0446300

PACKING SHEET (GAP)

RA0450200 (Lot. 1~3)

RA045020A (Lot. 4~)

FRONT PANEL ASSY

PHONE-JACK UNIT

PANEL UNIT

R3135000A

WASHER

RA0485300

LIGHT SHEET (A)

R6144801

NUT

RA0111400

RING NUT

RA0459700

BOTTOM CASE

RA0452400

REFLECTOR SHEET

RA0452500

DIFFUSER SHEET

R0136380

COIL SPRING

RA0484100

SPONGE RUBBER (LEG) (x2 pcs)

RA0452000

KNOB MAIN ASSY

Q7000428

LCD MODULE

S4000045

CASE LEG (x2 pcs)

VR UNIT

RA0269500

ROTARY KNOB (SQL)

RA0469800

LEG (A) (x2 pcs)

RA048210B

SPONGE RUBBER (WND)

RA0269400

ROTARY KNOB (AF)

RA0269600

ROTARY KNOB (SEL)

RA0471900

STAND (S)

RA0451900

KNOB ASSY (FUNC)

RA0473600

WASHER (KNOB)

RA0452300

RUBBER RING

RA0476800

SPACER KNOB (SEL)

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