YAESU_FT-857D维修手册..pdf

发布时间：2022-06-01 发布人：admin 分类：说明书资料大小：12.48M 资料格式：pdf 举报版权申诉

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Introduction

Specifications

General

Transmitter

Receiver

Exploded View & Miscellaneous Parts

Connection Diagram

Block Diagram

Circuit Description

Receive Signal Circuitry

RF Stages

1st Mixer Circuit/1st IF Circuit

Noise Blanker Circuit

AGC Circuit

FM IF Circuit/FM Demodulator Circuit

SSB/CW Demodulator Circuit

AM Demodulator Circuit

Audio Amplifier Circuit

Transmit Signal Circuitry

Microphone Amplifier Circuit

SSB Modulator Circuit

AM Modulator Circuit

FM Modulator Circuit

1st IF Circuit/1st Mixer Circuit

ALC Circuit

PLL Frequency Synthesizer

Master Reference Oscillator Circuit

CAR-DDS Circuit REF-DDS Circuit

1st Local Oscillator Circuit

2nd Local Oscillator Circuit

PLL Circuit

Alignment

Introduction and Precautions

Required Test Equipment

Alignment Preparation & Precautions

Local Oscillator Adjustment

Reference Frequency Adjustment

3rd Local Adjustment

PLL Adjustment

VCO VCV Adjustment

1st Local Output Level

PLL Unlock

Idling Current Adjustment

Pre-Driver Stage Idling Current

Driver Stage Idling Current

Exciter Stage Idling Current

TX IF Adjustment

SSB/CW TX IF Adjustment

FM TX IF Adjustment

Carrier Balance Adjustment

TX BPF Adjustment

VHF TX BPF Adjustment

UHF TX BPF Adjustment

RX Adjustment

SSB IF Adjustment

FM IF Adjustment

Air-Band Reception Adjustment

VHF Band Alignment

UHF Band Alignment

W-FM Reception Adjustment

Image Rejection Trap Adjustment

Noise Blanker Adjustment

Power Amplifier Adjustment

HF/50 MHz Idling Current Adjustment

V/UHF Idling Current Adjustment

Directional Coupler Balance Adjustment

LCD Contrast Alignment

REF Unit Alignment Points

MAIN Unit Alignment Points I

MAIN Unit Alignment Points II

MAIN Unit Alignment Points III

PA Unit Alignment Points

PANEL Unit Alignment Points

Software Menu Alignment

RX Gain Adjustment

SSB S-Meter Adjustment

FM S-Meter Adjustment

FM Center Meter Adjustment

FM Squelch Adjustment

Power Supply Voltage Display Adjustment

Over-current Protection Adjustment

RF Power Adjustment

TX Gain Adjustment

ALC (Automatic Level Control) Meter Adjustment

AFP (Automatic Final Protection) Adjustment

Carrier Level Adjustment

FM Modulation Adjustment

SSB Carrier Point Adjustment

VSWR Adjustment

ATAS control voltage confirmation

MAIN Unit

Circuit Diagram

Parts Layout

Parts List

C1xxx

CD1xxx

CF1xxx

CV1xxx

D1xxx

F1xxx

FB1xxx

J1xxx

JP1xxx

L1xxx

P1xxx

Q1xxx

R1xxx

RB1xxx

RL1xxx

S1xxx

T1xxx

TC1xxx

TH1xxx

VR1xxx

X1xxx

XF1xxx

PLL Unit

Circuit Diagram

Parts Layout

Parts List

C2xxx

D2xxx

J2xxx

L2xxx

Q2xxx

R2xxx

T2xxx

PA Unit

Circuit Diagram

Parts Layout

Parts List

C3xxx

D3xxx

FB3xxx

J3xxx

JP3xxx

L3xxx

Q3xxx

R3xxx

RL3xxx

T3xxx

TC3xxx

TH3xxx

TP3xxx

VR3xxx

PANEL Unit

Circuit Diagram

Parts Layout

Parts List

C4xxx

D4xxx

DS4xxx

J4xxx

L4xxx

Q4xxx

R4xxx

S4xxx

TH4xxx

VR4xxx

X4xxx

REF Unit

PHONE-JACK Unit

VR Unit

CONNECTOR Unit

DSP-2 Unit (Option)

Circuit Diagram

Parts Layout

Parts List

C6xxx

J6xxx

L6xxx

Q6xxx

R6xxx

X6xxx

TCXO-9 Unit (Option)

Technical Supplement ©2003 VERTEX STANDARD CO., LTD. EH007M90A 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. International Division 8350 N.W. 52nd Terrace, Suite 201, Miami, FL 33166, 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 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. Contents Specifications .................................................. 2 Exploded View & Miscellaneous Parts ...... 5 Connection Diagram ...................................... 7 Block Diagram ................................................. 8 Circuit Description ........................................ 9 Alignment ...................................................... 12 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 1

Specifications General Frequency Range: Emission Modes: Synthesizer Steps (Min.): Antenna Impedance: Operating Temp. Range: Frequency Stability: Supply Voltage: Current Consumption: Case Size (W x H x D): Weight (Approx.): 160 - 6 Meters, 2 Meters, 70 Centimeters (Amateur bands only) Receive: 0.1-56 MHz, 76-108 MHz, 118-164 MHz, 420-470 MHz Transmit: A1 (CW), A3 (AM), A3J (LSB/USB), F3 (FM), F1 (9600 bps packet), F2 (1200 bps packet) 10 Hz (CW/SSB), 100 Hz (AM/FM/WFM) 50 Ohms, Unbalanced 14 ºF to 140 ºF (–10 °C to +60 °C) ±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) Normal: 13.8 VDC ±15 %, Negative Ground Squelched: 550 mA (Approx.) Receive: 1 A Transmit: 22 A 6.1” x 2.0” x 9.2” (155 x 52 x 233 mm) 4.6 lb. (2.1 kg) Transmitter RF Power Output: (@13.8 V DC) SSB/CW/FM 100 W 50 W 20 W AM Carrier 25 W 12.5 W 5 W Modulation Types: 160- 6 M: 2 M: 70 CM: SSB: Balanced Modulator, AM: Early Stage (Low Level), FM: Variable Reactance ±5 kHz (FM-N: ±2.5 kHz) –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: Microphone Impedance: FM Maximum Deviation: Spurious Radiation: 400 Hz-2600 Hz (–6 dB) 200-10k Ohms (Nominal: 600 Ohms) 2

Specifications Double-Conversion Superheterodyne (SSB/CW/AM/FM) Superheterodyne (WFM) 1st: 68.33 MHz (SSB/CW/AM/FM); 10.7 MHz (WFM) 2nd: 455 kHz FM 100 kHz-1.8 MHz 1.8 MHz-28 MHz 28 MHz-30 MHz 50 MHz-54 MHz 144/430 MHz (SSB/CW/AM = 10 dB S/N, FM = 12 dB SINAD) SSB/CW AM 32 µV – – – 2 µV 0.2 µV 0.5 µV 0.2 µV 2 µV 0.125 µV 1 µV 0.2 µV 0.2 µV 0.125 µV – Receiver Circuit Type: Intermediate Frequencies: Sensitivity: Squelch Sensitivity: Image Rejection: IF Rejection: Selectivity (–6/–60 dB): FM – – 0.32 µV 0.16 µV 0.16 µV SSB/CW/AM – 2.5 µV 2.5 µV 1 µV 0.5 µV 100 kHz-1.8 MHz 1.8 MHz-28 MHz 28 MHz-30 MHz 50 MHz-54 MHz 144/430 MHz HF/50 MHz: 70 dB, 144/430 MHz: 60 dB 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 2.5 W (@4 Ohms, 10% THD or less) 4-16 Ohms AF Output: AF Output Impedance: Specifications are subject to change without notice, and are guaranteed within the amateur bands only. 3

Note 4

7 7 7 7 7 8 RA0471400 SPONGE (B) 8 2 2 7 7 7 7 P1090352 CONNECTOR RA0428700 CHASSIS 11 11 11 11 11 7 MAIN UNIT RA0257600 SP NET RA0489500 SPONGE RUBBER (DSP) T9207004 WIRE ASSY CONNECTOR UNIT Exploded View & Miscellaneous Parts Non-designated parts are available only as part of a designated assembly. Qty Ref. VXSTD P/N Description 4 1 U00315007 PAN HEAD SCREW M3X15B 2 2 U02208002 PAN HEAD SCREW SM2.6X8NI 3 U02306002 SEMS SCREW SM3X6NI 6 4 U20304007 BINDING HEAD SCREW M3X4B 2 2 5 U24104001 TAPTITE SCREW M2X4 6 U24105001 TAPTITE SCREW M2X5 3 21 7 U24205001 TAPTITE SCREW M2.6X5 4 8 U24206003 TAPTITE SCREW M2.6X6NIB 9 U24210007 TAPTITE SCREW M2.6X10B 4 10 U24306002 TAPTITE SCREW M3X6NI 4 13 11 U31205007 OVAL HEAD SCREW M2.6X5B 12 U43110007 TAPTITE SCREW M2X10B 2 RA0459600 TOP CASE RA0453200 GASCKET (SHIELD) RA0398100 SPONGE RUBBER (SP) M40900150 SPEAKER RA0283900 SPONGE RUBBER (SP-B) RA0413400 SP HOLDER RA0483900 SPONGE RUBBER (SP-C) 10 10 10 10 P1090352 (TYPE "M") P1090547 (TYPE "N") CONNECTOR RA0484500 SHEET (ANT) M2090036 FAN PA UNIT 7 8 7 T9207026 WIRE ASSY RA0446300 PACKING SHEET (GAP) 7 7 7 3 7 11 S5000240 SPACER 11 11 S4000045 CASE LEG (x2 pcs) 11 11 4 RA0469800 LEG (A) (x2 pcs) 4 RA0471900 STAND (S) 6 6 T9207023 WIRE ASSY M2090036 FAN 1 1 1 1 RA0450600 SUB PANEL T9101530 CT CABLE 9 9 12 RA0450500 REAR PANEL T9207024 WIRE ASSY RA0489800 SPONGE RUBBER (TX) 9 9 12 6 RA0481000 SHEET (LCD) R0137551 COIL SPRING 11 R0450700 RELEASE KNOB 5 5 6 PHONE-JACK UNIT PANEL UNIT RA0450900 LCD HOLDER RA0485400 LIGHT SHEET (B) RA0451000 LIGHT GUIDE (LCD) RA0451100 KNOB ASSY (MODE) RA0450800 HOLDER (MODE) Q9000796 ROTARY ENCODER 6 RA0111400 RING NUT RA0450200 FRONT PANEL ASSY R3135000A WASHER R6144801 NUT R0136380 COIL SPRING RA0459700 BOTTOM CASE RA0484100 SPONGE RUBBER (LEG) (x2 pcs) RA0485300 LIGHT SHEET (A) RA0452400 REFLECTOR SHEET RA0452500 DIFFUSER SHEET Q7000428 LCD MODULE VR UNIT RA048210B SPONGE RUBBER (WND) RA0451900 KNOB ASSY (FUNC) RA0473600 WASHER (KNOB) RA0473600 SPACER KNOB (SEL) RA0269500 ROTARY KNOB (SQL) RA0269400 ROTARY KNOB (AF) RA0269600 ROTARY KNOB (SEL) RA0452000 KNOB MAIN ASSY RA0452300 RUBBER RING 5

Note 6

Connection Diagram 7

Block Diagram 8

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