Yaesu FT-817 Service Manual

HF / VHF / UHF

All Mode Transceiver

FT-817

Technical Supplement

(E137790A)

Introduction

This manual provides technical information necessary for servicing the Yaesu FT-817 HF & V/UHF-Bands Transceiver. It does not include information on installation and operation, which are described in the FT-817 Operating Manual provided with the transceiver, or on accessories which are described in their manuals.

The FT-817 is carefully designed to allow the knowledgeable operator to make nearly all adjustments required for various station conditions, modes and operator preferences simply from the controls on the panels, without opening the case of the transceiver. The FT-817 Operating Manual describes these adjustments, plus certain internal settings.

Servicing this equipment requires expertise in handling surface mount chip components. Attempts by unqualified persons to service this equipment may result in permanent damage not covered by warranty. For the major circuit boards, each side of the board is identified by the type of the majority of components installed on that side. In most cases one side has only chip components, and the other has either a mixture of both chip and lead compo-

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

nents (trimmers, coils, electrolytic capacitors, packaged ICs, etc.), or lead components only.

While we believe the technical information in this manual is 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. VERTEX STANDARD reserves the right to make changes in this transceiver and the alignment procedures, in the interest of technological improvement, without notification of owners.

Specification .................................................. 2

Exploded View & Miscellaneous Parts..... 3

Block Diagram ............................................... 5

Circuit Description ....................................... 7

Alignment..................................................... 13

Interconnection Diagram........................... 23

Board Unit (Schematics, Layouts & Parts)

MAIN Unit ...............................................................25

PLL Unit ...................................................................57

REF Unit ...................................................................65

PA / FINAL Unit......................................................71

PANEL Unit .............................................................89

VR Unit .....................................................................99

TCXO-9 Unit (Option) ..........................................100

Specifications

General

Frequency Range:

Receive: 100 kHz-30 MHz

50 MHz-54 MHz 76 MHz-108 MHz (WFM only)

87.5 MHz-108 MHz (EU) 108 MHz-154 MHz (USA) 144 MHz-148 (146) MHz (Other markets) 430 (420) MHz-450 (440) MHz

Transmit:160-6 Meters

2 Meters 70 Centimeters (Amateur bands only)

5.1675 MHz Alaska Emergency Frequency (USA 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)

Antenna Impedance:

50 Ohms, Unbalanced (Front: Type BNC, Rear: Type M)

Operating Temp. Range:

–10 °C to +60 °C (+14 °F to +140 °F)

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 Operating: 8.0-16.0 V, Negative Ground

FBA-28 (w/8 “AA” Alkaline Cells): 12.0 V FNB-72 (Ni-Cd Battery Pack): 9.6 V (Option)

Current Consumption:

Squelched: 250 mA (Approx.) Receive: 450 mA Transmit: 2.0 A

Case Size (W x H x D):

135 x 38 x 165 mm (5.31” x 1.5” x 6.50”)

Weight (Approx.):

1.17 kg (2.58 lb) w/Alkaline battery, antenna, w/o Microphone

Receiver

Circuit Type: Double-Conversion Superheterodyne Intermediate Frequencies:

1st: 68.33 MHz (SSB/CW/AM/FM); 10.7 MHz (WFM) 2nd: 455 kHz

Sensitivity: SSB/CW AM FM

100 kHz-500 kHz – – – 500 kHz-1.8 MHz – 32 µV –

1.8 MHz-28 MHz 0.25 µV 2 µV – 28 MHz-30 MHz 0.25 µV 2 µV 0.5 µV 50 MHz-54 MHz 0.2 µV 2 µV 0.32 µV 144/430 MHz 0.125 µV – 0.2 µV (IPO, ATT off, SSB/CW/AM = 10 dB S/N, FM = 12 dB SINAD)

Squelch Sensitivity: SSB/CW/AM FM

1.8 MHz-28 MHz 2.5 µV – 28 MHz-30 MHz 2.5 µV 0.32 µV 50 MHz-54 MHz 1 µV 0.2 µV 144/430 MHz 0.5 µV 0.16 µV (IPO, ATT off)

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

AF Output: 1.0 W (8 Ohms, 10% THD or less) AF Output Impedance: 4-16 Ohms

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

Frequency ranges vary according to transceiver version; check with your dealer.

Transmitter

RF Power Output:

5 W (SSB/CW/FM), 1.5 W (AM Carrier) @13.8 V

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 Supp.: >50 dB SSB Frequency Response: 400 Hz-2600 Hz (–6 dB) Microphone Impedance:

200-10k Ohms (Nominal: 600 Ohms)

No.

VXSTD P/N Description Qty. U9900112 TAPTITE SCREW M2X8B 1

U02308001 SEMS SCREW SM3X8 2

U04306002 SEMS SCREW HSM3X6NI 1

U20205007 BINDING HEAD SCREW M2.6X5B 7

U23206001 TAPTITE SCREW M2.6X6 1

U24205001 TAPTITE SCREW M2.6X5 11

U24306002 TAPTITE SCREW M3X6NI 2

U31204007 OVAL HEAD SCREW M2.6X4B 2

U31205007 OVAL HEAD SCREW M2.6X5B 8

U9900012 TAPTITE SCREW M2X4 2

Description VXSTD P/N VERS. ANTENNA (YHA-63) Q3000174 MIC (MH-31A8J) A06870001 CABLE (E-DC-6) Q9000722 W/O CE DC CABLE (DC 3A 1500MM) T9023003 W/ CE

Screw List

ACCESSORIES

RA0270100 RUBBER KNOB (CLAR)

RA027150B (Lot.49~) RA027150A FRONT PANEL ASSY

RA026960A (Lot.54~) RA0269600 ROTARY KNOB (SEL)

RA0269700 MAIN KNOB

RA0269800 RUBBER RING

RA0269400 ROTARY KNOB (AF)

RA0283600 REFLECTOR SHEET (A)

RA027160A (Lot. 17~) RA0271600 LIGHT GUIDE

RA0283700 REFLECTOR SHEET (B)

Q7000291 LCD UNIT

RA0269500 ROTARY KNOB (SQL)

RA027530A RELEASE KNOB (A)

RA0270200 RUBBER KNOB (MODE)

RA0276300 HOLDER PLATE

RA0271700 LCD HOLDER

R6054387B SPECIAL NUT

RA0283800 SPONGE RUBBER (SP-A)

M4090150 SPEAKER

RA0270500 SP HOLDER

RA0284300 SPONGE RUBBER (SH-B)

P1091117A (Lot. 17~) P1091117 CONNECTOR (w/ *1,*2)

RA027540A RELEASE KNOB (B)

RA027620B COIL SPRING (2 pcs)

VR UNIT

Q9000709A ROTARY ENCODER (W/ *3,*4)

RA027040A (Lot.35~) RA0270400 RUBBER KNOB (PWR)

RA0293700 SPONGE RUBBER (CASE) (Lot.23~ W/O CE)

RA0270300 RUBBER KNOB (ABC)

RA0290000 SPONGE RUBBER (BT-B)

RA027090A BATTERY COVER

PANEL UNIT

Exploded View & Miscellaneous Parts

CP6960001 TOP CASE ASS’Y (W/SP NET)

RA0283900 SPONGE RUBBER (SP-B)

RA031630B (Lot.22~) RA031630A (10~) RA0316300 (8~) RA0293500 SPONGE RUBBER (KEY-F)

P1090352

CONNECTOR

RA0284200 (X2 pcs) SPONGE RUBBER (SH-A)

RA0293600 PAD

RA027080A BOTTOM CASE

RA0276400 (X2 pcs) BELT HOOK

RA0289900 SPONGE RUBBER (BT-A)

MAIN UNIT

RA026720B (Lot.36~) RA026720A CHASSIS

RA0250800 PAD

RA027660A CONNECTOR COVER

PA UNIT / FINAL UNIT

AAB33X001 FBA-28

Exploded View & Miscellaneous Parts

DESCRIPTION VALUE V/W TOL. VS P/NMFR’S DESIG VERS.REF. LOT. SIDE

*** MAIN ASSY *** P 0004 WIRE ASSY J1012 to SP T9206744 1P 0005 WIRE ASSY J1008 to J4002 T9206919 1P 0006 WIRE ASSY J1003 to J3004 T9206920 1P 0007 WIRE ASSY BATTERY CASE T9206940 1P 0007 WIRE ASSY BATTERY CASE T9206932A 3-

Block Diagram

Note:

Circuit Description

The FT-817 internal assembly consists of the MAIN Unit, Control ( PANEL) Unit, and the PA Unit. The MAIN Unit contains the receiver front end, PLL IC, and switching circuits, as well as the VCO Unit (local oscillator for transmission and reception). The PANEL Unit contains the CPU and reset circuits, as well as the power circuitry for the LCD.

Receive Signal Circuitry

High-Frequency Circuit

The receive signal enters from the Front (J1001) or Rear (J1002) ANT connector , as selected by relay RL3016 on the PA Unit.

Signals between 0.1 and 154 MHz received at the antenna terminal pass through an input low-pass filter composed of L3081, L3082, C3264, and C3265.

Received 430 MHz signals, after passing through a highpass filter composed of L3071, L3076, C3245, and C3254 are passed through low-pass filter composed of L3028, L3032, L3035, C076, C3082, C3088, and C3093, and then are fed through the directional coupler to the UHF T/R switch circuit composed of diode switch D3004/D3035 (both HSU277). The signal then is fed to MAIN Unit via J3002.

Received 145 MHz signals, after passing through a highpass filter composed of L3071, L3075, L3079, C3234, C3245, C3252, and C3260 are passed through low-pass filter composed of L3027, L3031, L3034, C3075, C3081, and C3092, and then are fed through the directional coupler to the VHF T/R switch circuit, composed of diode switch D3003/ D3005 (both HSU277) . The signal then is fed to MAIN Unit via J3002.

Received 0.1-54 MHz signals, after passing through the first low-pass filter, are passed through another low-pass filter composed of L3069, L3070, L3074, L3077, C3239, C3242, and C3248, plus LPFs 1-7 (5th or 7th-order Chebyschev type filter) and HPFs 1-7, utilizing seven different sections to create optimized bandpass responses for the various amateur bands at 0.1-54 MHz. The signal then is fed to the 50MHz pre-amplifier (when engaged) and on to the MAIN Unit via J3002.

The receive signal then passes through the input attenuator (-10dB) which consists of resistors R1001, R1014, and

R1015 plus diodes D1003/D1011 (both DAP236U) on the MAIN Unit .

Incoming wideband FM (76-108 MHz) signals, after passing through a high-pass filter composed of L3071, L3075, L3079, C3234, C3245, C3252, and C3260 are passed through a low-pass filter composed of L3027, L3031, L3034, C3075, C3081, and C3092 , and through a directional coupler, to the VHF T/R switch circuit, composed of diode switch D3003/D3005 (both HSU277) . Then it is fed to the MAIN Unit via J3002. The signal is delivered to IC Q1025 (CXA1611N) which contains the front-end and discriminator circuits for Wide-FM demodulation. Then the audio signal is passed to analog switch IC Q1049 (BU4066BF).

The FT-817 includes four receiver front ends, each optimized for a particular frequency range and mode combination.

1st Mixer Circuit/1st IF Circuit

The 1st mixer on the MAIN Unit consists of a quad MES FET, D1047 (GN2011). The 1st local signal (68.430-538.330 MHz) from the PLL Unit is applied to the gates of each FET in the 1st mixer.

The resulting output signal (the difference between the local signal and receive signal) passes through a monolithic crystal filter (MCF) XF1001 (MF68R, BW:±7.5 kHz) to obtain the 1st IF signal having a center frequency of

68.33 MHz. The signal is then fed to the 2nd mixer circuit on the MAIN Unit after it is amplified by FET Q1051 (BB304C).

2nd Mixer Circuit/2nd IF Circuit

The 2nd mixer consists of FETs Q1060 and Q1062 (both 2SK302Y) on the MAIN Unit. The 2nd local signal (67.875 MHz) is amplified by Q1047 (2SC4154E) and is applied to each FET's gate in the 2nd mixer.

The signal output from the 2nd mixer passes through a ceramic filter, or optional mechanical filter (U1003), to become the 455-kHz 3rd IF signal.

Noise Blanker Circuit

A sample of the 2nd IF circuit is amplified by FETs Q1052 and Q1061 (both BB301C) on the MAIN Unit, and then is rectified by D1068 (1SS372). The resulting DC voltage passes through R1343 and R1345, C1360 and C1362, and Q1076 (2SC4154E) to yield an average AGC voltage for

Circuit Description

controlling the amplification gain of the above FETs. Noise pulses contained in the output from D1075 are detected by Q1074 (2SC4154E) and are used to control the NB Gate.

AGC Circuit

The AGC circuit consists of D1064 (1SS372), transistor Q1066 (2SC4154E), and associated parts on the MAIN Unit. Output from the AGC circuit is fed back to the RF and IF stages, controlling their gain levels.

FM IF Circuit/FM Demodulator Circuit

The 2nd IF signal is fed to IC Q1069 (BA4116FV) for FM demodulation.

The FM demodulator IC contains a mixer, limiter amplifier, filter amplifier, squelch trigger, and demodulator. The IF input signal is band-limited by ceramic filter CD1002 (CDBC455CX24, BW:±4 kHz), amplified by the limiter amplifier, and demodulated into an audio signal by the demodulator; it then passes through a filter (R1308 and C1293). The signal next passes through a de-emphasis circuit which consists of R1256 and C1286.

The squelch circuit selectively amplifies the noise component of the demodulator output using the filter amplifier inside the FM IC and the active band-pass filter consisting of an externally attached resistor and capacitor. This circuit uses a signal detected by D1065 (DA221).

SSB/CW Demodulator Circuit

The 2nd IF signal is applied to the SSB demodulator Q1055 (SN16913) on the MAIN Unit, which produces audio by applying a carrier signal from the CAR-DDS IC (Q1031). Similarly, the CW signal is demodulated using a carrier signal which is offset by the "Pitch" frequency.

The demodulated SSB and CW signals are each stripped of high-frequency components by an active low-pass filter which consists of op-amp IC Q1093-1 (NJM2902V). Then, they enter the VR Unit via J1008.

AM Demodulator Circuit

The 2nd IF signal from the IF Unit is applied to diode D1060 (BAS316) for AM demodulation .

volume control VR4901, and IC Q1070 (TDA7233D) to drive the internal or external speaker with a maximum output of approximately 1.0 Watt.

Transmit Signal Circuitry

Microphone Amplifier Circuit

The audio signal from microphone jack J1014 on the MAIN Unit is amplified by transistor Q1092 (2SC4154E) on the MAIN Unit, and then is applied to electronic volume IC Q1071 (M62364EP), which is controlled via the User Menu (Item #46: SSB MIC).

The output (audio signal) from the electronic volume IC is amplified by Q1096 (NJM2902V) and fed to balanced modulator IC Q1087 (SN16913) through the low-pass filter IC Q1096 (NJM2902V).

During FM transmission, the audio signal is adjusted via the User Menu (Item# 29 : FM MIC) . The audio signal that has passed through the pre-emphasis circuit (C2201 and R2228 on the MAIN Unit) may be mixed with a tone signal from CPU IC Q4004, and is then amplified and limited by op-amp IC Q1095-4 (NJM2902V) of the IDC circuit. The audio then passes through the splatter filter (secondary active low-pass filter) formed by op-amp IC Q1095-1 (NJM2902V), R1321, and R1322, plus C1344, and is then fed to the frequency-modulator circuit on the MAIN Unit through R1183 and R1477 for setting of the frequency deviation.

SSB Modulator Circuit

The carrier signal appropriate to the transmitting mode (LSB or USB) is applied from the CAR-DDS Unit to balanced modulator IC Q1087 (SN16913) on the MAIN Unit, and is modulated by microphone audio.

The balanced modulator produces the upper and lower side bands and carrier signal. The carrier and audio signal are suppressed and the carrier balance is adjusted by VR1001. As a result, the output signal obtained is a DSB signal with a carrier suppression of 30 dB or more (additional carrier suppression is supplied by the SSB filter).

The output from the detector passes through analog switch Q1049 (BU4066BF). Then, it enters the VR Unit via J1008.

Audio Amplifier Circuit

The demodulated signal that is selected by one of analog switches IC Q1057 (according to the reception mode) passes through the audio amplifier IC Q1094 (NJM2902V),

The DSB modulated signal (1st IF signal: 455 kHz) then passes through ceramic filter CF1004 (CFJ455K14) or the optional mechanical filter U1003 on the MAIN Unit, stripping residual carrier and the undesired sideband; the signal then passes as an SSB signal through buffer-amplifier Q1040 (BB301C).

Circuit Description

AM Modulator Circuit

As in the SSB modulator circuit, a carrier signal from the CAR-DDS Unit and an audio signal from the microphone are applied to balanced modulator IC Q1087 (SN16913) on the MAIN Unit.

The control signal from MODE SW IC Q1021 (BU4094BCFV) on the MAIN Unit causes a voltage labeled "AM 5V" to be sent from transistor Q1079 (2SC4154E). This voltage is applied to IC Q1087 via D1077 (BAS316), causing the balanced modulator to lose balance. The restored carrier signal and modulated signal are then fed to the Tx mixer via ceramic filter CF1004 (CFJ455K14) on the MAIN Unit.

Frequency Modulation Circuit

The FM circuit uses a voltage controlled crystal oscillator (VCXO) which consists mainly of Q1033 (2SC4400), X1001 on the MAIN-Unit, varactor diode D1056 (HVC362), and T1018. The VCXO has a center frequency of 22.7785MHz.

The FM signal is produced by applying a signal from the FM microphone amplifier circuit to varactor diode D1056 and varying the crystal oscillator load capacity in proportion to the signal voltage.

CW (A1) Signal Generator Circuit

When the transmitting mode is CW (A1), the control signal from D-A converter IC Q1077 (M62353GP) on the MAIN Unit creates a "CW 5V" voltage. The voltage is applied to balanced modulator IC Q1087 via D1071, providing a carrier from the balanced modulator for the input to the transmit signal circuit of the MAIN Unit.

1st IF Circuit/1st Mixer Circuit

The 455 kHz 1st IF signal from the modulator circuit is band-limited by the MAIN Unit's ceramic (CF1004) or optional mechanical filter U1003 (XF5201 or XF5301) according to the selected mode (CW, SSB, or AM). It is then buffer-amplified by FET Q1040 (BB301C) and fed to 1st mixer IC Q1038 (SN16913).

The IF Unit's double balanced mixer IC Q1038 (DBM) is used as the 1st mixer. A local signal (67.875MHz) is produced by tripling the Reference frequency at Q1047 (2SC4154E), and this local signal is fed to the "local" port of the doubly-balanced mixer IC, where it is mixed with the 455 kHz 1st IF signal to produce a 68.33MHz 2nd IF signal.

2nd IF Circuit/2nd Mixer Circuit

The 2nd IF signal passes through crystal filter XF1001 and then is fed to the 2nd mixer circuit.

The 2nd mixer consists of the MAIN Unit's D1049 (HSB88WS). The 2nd local signal (68.430-538.330MHz) from the PLL Unit is applied to the gates of each FET in the 2nd mixer.

High-Frequency Transmit Preamplifier Circuit

The transmit signal is passed through a low-pass filter (1.8-

29.7 MHz), a high-pass filter (50-54 MHz), a band-pass filter (144-146 MHz), or a band-pass filter (430-440 MHz) and then is amplified by Q1001 (UPC2710), and passed onward to the PA Unit via J1002.

Power Amplifier Circuit

The transmit signal from the MAIN Unit arrives at connector J3001 on the PA Unit.

The transmit signal (1.8 MHz to 430 MHz) delivered to the PA Unit is amplified by pre-driver Q3001 (2SC3357), driver Q3002 (2SK5296) and final amplifiers Q5401/Q5402 (2SK2975).

Low-Pass Filter (LPF) Circuit

The transmission signal from the power amplifier circuit is passed through a low-pass filter which consist mainly of RL3001-RL3015, RL3017, and corresponding inductor and capacitor networks. The LPF is a 5th or 7th-order Chebyschev type filter, utilizing nine different sections for the various amateur bands at 1.8 ~ 430 MHz.

The low-pass filtered transmission signal is fed to the FRONT ANT connector (J0001) or REAR ANT connector (J0002) through the triplexer and directional coupler.

The directional coupler samples a part of the transmission power to detect forward power and reflected power. A DC voltage corresponding to the relative forward/reflected power is produced by D3032/D3033 (both MA716,

1.8 to 54 MHz), D3009/D3017 (both MA716, 144 to 148 MHz), or D3007/D3008 (both MA716, 430 to 450 MHz) , and is used for automatic level control (ALC).

ALC Circuit

The output from the directional coupler is routed from connector J3004 and applied to the ALC circuit via connector J1003 on the MAIN Unit.

The ALC circuit consists of an op-amplifier circuit for amplifying the forward and reflected voltage, a time-con-

Circuit Description

stant ALC amplifier, and a transmit signal control circuit on the MAIN Unit.

The forward voltage from connector J1003 on the MAIN Unit is added with a DC control voltage and is then applied to op-amp IC Q1097 (NJM2902V).

The reflected voltage is added with a DC control voltage and is then applied to op-amp IC Q1098 (NJM2904V), In the event of high SWR conditions (SWR of 3:1 or more), transmitter output is reduced and a "High SWR" warning appears, thus protecting the PA Unit from potential damage and alerting the operator to the high SWR situation.

The ALC amplifier amplifies the "forward" DC output via transistor Q1019 (2SC4154). This output then passes through a fast-attack, slow-delay RC time-constant circuit which consists of R1097 and C1113 for the input to the Tx signal control circuit on the MAIN Unit.

The TX control circuit adjusts the IF amplifier gain via gate 2 of FET Q1007 (BB304C) of the 68.33 MHz IF amplifier circuit to prevent the power output from exceeding the preset level.

PLL Frequency Synthesizer

The PLL Frequency Synthesizer consists mainly of a master reference oscillator circuit, 2nd local oscillator circuit, plus the PLL IC, CAR-DDS, and REF-DDS units, which digitally synthesize carrier outputs, and a PLL circuit which contains a voltage controlled oscillator (VCO).

Master Reference Oscillator Circuit

The master reference oscillator uses a crystal oscillator (oscillation frequency: 22.625MHz) composed of Q5001 (2SC4400-4), X5001, TC5001, C5001, R5005, and associated components. The reference oscillator signal passes through buffer amplifier Q5002 (2SC4400-4), C5004, C5007, R5003, R5004, R5007, and is then fed to the MAIN Unit via J5002.

CAR-DDS Circuit /REF-DDS Circuit

DDS ICs Q1031 (AD9835BRU) and Q2016 (AD9850BAS) each contain a shift register, selector, phase accumulator, and ROM.

The reference oscillation frequency (22.625MHz) that is delivered to each of the DDS Units is applied to each DDS IC after amplification by transistors Q1028/Q2020 (both 2SC4400-4).

The DDS outputs contain digital amplitude data corresponding to serial frequency data from CPU IC Q4004 of the PANEL Unit. The DDS frequency range is 453.5 ~ 466.5 kHz (cf = 455.0 kHz) for the CAR-DDS, and 7.2-8.0 MHz for the REF DDS.

2nd Local Oscillator Circuit

The 2nd L.O. circuit is a Hartley-type overtone oscillator circuit (frequency: 67.875 MHz) composed of Q1047 (2SC4400) on the MAIN Unit.

1st Local Oscillator Circuit

VCO output is buffer-amplified by Q2008 (2SC4400), Q2011, Q2014, and Q2016(all 2SC5374) and passes through a low-pass filter. It is then fed to the Tx/Rx frequency mixer circuitry on the MAIN Unit.

PLL Circuit

The PLL circuit is a frequency mixing type composed of a VCO, mixer, PLL IC, and loop filter.

The VCO consists of five circuits (VCO1, VCO2, VCO3, VCO4, and VCO5), with a frequency range of 68.430-

538.330 MHz divided into five bands, allocated to the five VCO circuits. VCO1-VCO5 consist mainly of FETs Q2004, Q2005, and Q2006 (all 2SK210GR), transistors Q2009, Q2010 (both 2SC5374), diodes D2001-D2006 (all HVC362), D2007 (1SV282), D2008 (1SV281), and D2009 (1SV286), and coils T2001-T2003, L2010, and L2011.

The VCO switching signal from connector J2002 is used to drive switching transistors Q2001, Q2002, Q2003, Q2012, and Q2013 (all DTC124EU) to switch the source terminal of the oscillator FET.

The 68.430-538.330 MHz VCO signal is fed to mixer D1047 (GN2011-Q).

The REF-DDS signal (7.2-8.0 MHz) is fed to PLL IC Q2022 (FQ7925) after it passes through a LPF composed of C2064, C2067, C2069, C2071, C2075, L2014, L2015, and L2016 , and buffer amplifier Q2019 (2SC4400-4) .

The phase of the reference frequency and that of the signal input to PLL IC are compared, and a signal whose pulse corresponds to the phase difference is produced. The VCO frequency is controlled by a first lag filter which consists of R2057, R2065, R2062, and C2090 and a secondary lag filter composed of C2085, C2088, and R2053.

Circuit Description

Control Circuitry

Microprocessor Circuit

The microprocessor circuit, which is composed of CPU IC Q4004 (HD64F2345) and EEPROM IC Q4004 (ATC64N10S1), performs various types of processing, such as control signals, serial I/O, A/D conversion, dial counter circuit control, key input, and display functions.

The EEPROM memorizes various parameters and settings (transmission frequency range, transmission output control) and carrier points according to the transceiver version and the contents of memory channels.

Reset Circuit

The reset circuit consists mainly of PANEL Unit ICs Q4014 (PST3445), Q4015 (2SC4154E), Q4011 (2SA1602A), Q4016 (2SC4154E), and Q4010 (2SA1602A), and associated capacitors and resistors. This circuit controls the powerdown input port, CPU reset input, keyer CPU, and related circuits.

Dial Counter Circuit

The dial counter circuit consists of Main Dial and SEL (Selector) Knob. This circuit detects a two-phase pulse having a phase difference of 90 degrees and delivers it to CPU IC Q4006 .

Serial Data Communication Circuit

The Serial Data Communication Circuit consists of ICs Q4008, Q4009, Q4010, etc. on the PANEL-Unit. These ICs distribute a set of serial data (Data/Clock/Strobe) generated by CPU to various devices, such as CAR-DDS, REFDDS, E.VOL, D/A, or Shift-Register for controlling analog switching , band switching, VCO selection, etc. Serial data communication is clock synchronous for the above purposes, whereas the serial data is transferred to an asynchronous signal for the CAT system for external computer control of the transceiver).

this circuit reads the input data for processing by the CPU.

Analog-Digital Converter Circuitry

Forward and reflected voltage, ALC, DISC, S-meter, etc. metering options are selected by MAIN Unit IC Q1073 (BU4053BCF) and are fed to the A/D port of CPU IC Q4004 for conversion into digital values to be processed prior to display on the LCD. The individual voltages, converted into digital values, are displayed as PO, SWR, ALC, VCC, and S-meter indications on the LCD panel.

LED Drive Circuit

The LED drive circuit consists of PANEL Unit transistors Q4018 and Q4019 (both 2SC1623) and the LEDs. This circuitry drives (turns on/off) the appropriate LEDs.

LCD Circuit

Data processed by the CPU IC is sent as parallel data to LCD Unit DS4001 .

CTCSS Tone Generator Circuit

The CTCSS tone generator circuit consists mainly of CPU IC Q4004 and active filter IC Q1094 (NJM2902).

Electronic Keyer Circuit

The electronic keyer circuit consists of CPU IC Q4004. When the CW mode is selected, this circuit controls the generation of Morse characters.

Various types of data, such as operating frequency, mode, and display data, are processed by CPU IC Q4004 .

The CAT (external computer control) signals are converted to RS232 interface standard levels by the optional CAT Interface Cable (CT-62).

Key Matrix Circuit

The key matrix circuit consists of PANEL Unit diodes D4001-D4003 and D4006 (all IMN10) and the panel key switches arranged on the matrix. When a key is pressed,

Circuit Description

Note:

Alignment

Introduction

The FT-817 has been carefully aligned at the factory for the specified performance across the amateur band. Realignment should therefore not be necessary except in the event of a component failure. All component replacement and service should be performed only by an authorized VERTEX STANDARD representative, or the warranty policy may be voided.

The following procedures cover the sometimes critical and tedious adjustments that are not normally required once the transceiver has left the factory. However, if damage occurs and some parts are replaced, realignment may be required. If a sudden problem occurs during normal operation, it is likely due to component failure; realignment should not be done until after the faulty component has been replaced.

We recommend that servicing be performed only by authorized VERTEX STANDARD service technicians who are experienced with the circuitry and fully equipped for repair and alignment. Therefore, if a fault is suspected, contact the dealer from whom the transceiver was purchased for instructions regarding repair. Authorized VERTEX STANDARD service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifications after replacing any faulty components. Those who do undertake any of the following alignments are cautioned to proceed at their own risk. Problems caused by unauthorized attempts at realignment are not covered by the warranty policy. Also, VERTEX STANDARD must reserve the right to change circuits and alignment procedures in the interest of improved performance, without notifying owners. Under no circumstances should any alignment be attempted unless the normal function and operation of the transceiver are clearly understood, the cause of the malfunction has been clearly pinpointed and any faulty components replaced, and the need for realignment determined to be absolutely necessary.

Required Test Equipment

The following test equipment (and thorough familiarity with its correct use) is necessary for complete realignment. Correction of problems caused by misalignment resulting from use of improper test equipment is not covered under the warranty policy. While most steps do not require all of the equipment listed, the interactions of some

adjustments may require that more complex adjustments be performed afterwards. Do not attempt to perform only a single step unless it is clearly isolated electrically from all other steps. Have all test equipment ready before beginning, and follow all of the steps in a section in the order presented.

r RF Signal Generator with calibrated output level at 500

MHz

r Deviation Meter (linear detector) r AC Voltmeter r SINAD Meter r Inline Wattmeter with 5% accuracy at 500 MHz r Regulated DC Power Supply: adjustable from 8 to 16.5

VDC, 5A

r 50-Ohm Non-reactive Dummy Load: 5 W at 500 MHz r 150-Ohm Dummy Load: 5 W at 500 MHz r FM Linear Detector r Frequency Counter: ±0.1 ppm accuracy at 500 MHz r AF Signal Generator r DC Voltmeter: high impedance r VHF Sampling Coupler r AF Dummy Load: 4 Ohms, 5 W

Alignment Preparation & Precautions

A dummy load and inline wattmeter must be connected to the main antenna jack in all procedures that call for transmission, except where specified otherwise. Correct alignment is not possible with an antenna. After completing one step, read the following step to determine whether the same test equipment will be required. If not, remove the test equipment (except dummy load and wattmeter, if connected) before proceeding.

Correct alignment requires that the ambient temperature in the repair shop be the same as that of the transceiver and test equipment, and that this temperature be held constant between 20° and 30°C (68° ~ 86°F). When the transceiver is brought into the shop from hot or cold air it should be allowed some time for thermal equalization with the environment before alignment. If possible, alignments should be made with oscillator shields and circuit boards firmly affixed in place. Also, the test equipment must be thoroughly warmed up before beginning.

Alignment

The alignment procedure for the FT-817 involves several steps requiring that the case be opened to gain access to the components to be adjusted. These procedures are described first in the pages to follow. A number of alignment categories, however, may be accomplished without opening the transceiver case, utilizing the Alignment Menu feature which allows adjustments to be accomplished using the front panel controls.

Please survey the pages to follow. Depending on the problem(s) needing correction, you may be able to skip to the software-based alignment section.

Use external DC input of +13.8 Volts via the rear panel DC input jack, for all alignment steps.

Local Oscillator Adjustment

Reference Frequency Adjustment

1. Connect the frequency counter to Q1038 (pin 5).

2. Adjust trimmer capacitor TC5001 (on the REF-Unit) for

a reading of 67.875 MHz (±10 Hz) on the frequency counter.

3. Connect the RF millivoltmeter or an oscilloscope to

J5002 (pin 2) and confirm that the output level is at least 60 mVrms or 169 mVp-p.

PLL Adjustment

VCO VCV Adjustment

Connect the DC voltmeter to J2002 (pin 6) and referring to the table below, tune the transceiver to each frequency listed. Then confirm that the correct voltage is present, or adjust the listed components for the required voltage.

Tune to : Adjust / Confirm For

13.895 MHz, CW mode Adjust T2001 4.6 V ±0.2 V

76.000 MHz, CW mode Confirm At least 0.5 V

29.995 MHz, CW mode Adjust T2002 4.2 V ±0.2 V

13.900 MHz, CW mode Confirm At least 0.8 V

53.995 MHz, CW mode Adjust T2003 4.4 V ±0.2 V

88.000 MHz, CW mode Confirm At least 0.8 V

146.000 MHz, CW mode Adjust L2010 3.8 V ±0.2 V

144.000 MHz, CW mode Confirm At least 3.0 V

440.000 MHz, CW mode Adjust L2011 2.4 V ±0.2 V

430.000 MHz, CW mode Confirm At least 1.0 V

Q1038 (pin 5)

T2003

T2002

L2010

T2001

TC5001

J5002 (Pin 2

)

J2002 (Pin 11

J2002 (Pin 6

L2011

J2002 (Pin 1

)

Alignment

1st Local Output Level

1. Connect the RF millivoltmeter to J2002 (pin 11) and tune

the transceiver to 28.000 MHz in the CW mode.

2. Confirm that the RF level is at least +5 dBm (or 400 mVrms).

PLL "Unlock" Display Alert

1. Connect the DC voltmeter to J2002 (pin 1).

2. Disconnect the 4-pin plug connected to J5002 (REF-Unit), and confirm that (A) the voltmeter shows less than 0.5 V and (B) that "UNLOCK" is displayed on the LCD.

3. Re-connect the 4-pin plug to J5002, and confirm that the voltmeter shows at least 3.5 V and that LCD display has returned to normal.

PA Unit Adjustment

Before alignment, set the mode to CW and tune the transceiver to 1.800 MHz. Nothing should be connected to the CW Key Jack.

5. Press the PTT switch, and adjust VR3002 for an indica-

tion of 20 mA (±2 mA) on the ammeter.

6. Disconnect the ammeter and reinstall the jumper con-

nector at J3006.

Final Stage Idling Current

1. Connect the ammeter between the "13US" pin on PA Unit and the "13US" pin of the Final Unit. The "13US" line is currently connected by a wire; remove it so you can connect the ammeter.

2. Turn both VR5401 and VR5402 fully counterclockwise.

3. Press the PTT switch, and adjust VR5401 for an indication of 45 mA (±2 mA) on the ammeter.

4. Press the PTT switch, and adjust VR5402 for an indication of 76 mA (±4 mA) on the ammeter.

5. Release the PTT switch. Re-connect the "13US" line between PA unit and Final Unit.

Driver Stage Idling Current

1. Remove the jumper connector at J3005, and insert an

ammeter in its place.

2. Press the microphone's PTT switch, and adjust VR3001

for an indication of 30 mA (±2 mA) on the ammeter.

3. Disconnect the ammeter and reinstall the jumper con-

nector at J3005

4. Remove the jumper connector at J3006 and insert the

ammeter in its place.

VR5401

VR5402 VR3002

J3006

VR3001

J3005

Jumper

Alignment

Local Oscillator Adjustment

2nd Local Adjustment

1. Connect the RF millivoltmeter or an oscilloscope to

Q1038 (pin 5).

2. Adjust T1024 and T1026 alternately for maximum in-

dication on the millivoltmeter or for maximum amplitude on the oscilloscope.

3. Confirm the indicated voltage is at least 120 mVrms or 330 mVp-p.

3rd Local Adjustment

1. Connect the RF millivoltmeter or an oscilloscope to pin 5 of Q1055.

2. Key the transceiver in the CW mode, and adjust T1021 for maximum indication on the RF millivoltmeter.

3. Confirm that the indicated voltage is at least 70 mVrms or 200 mVp-p.

TX IF Adjustment

CW TX IF Adjustment

1. Tune the frequency to 1.8 MHz in the CW mode. Connect the RF millivoltmeter to J1002, terminated by a 50 Ohm dummy load.

2. Key the transceiver, and adjust T1020, T1012, and T1005 alternately for maximum indication on the RF millivoltmeter.

FM TX IF Adjustment

1. Tune the frequency to the 29 MHz band in the FM mode. Leave the RF millivoltmeter connected to J1002, still terminated by the 50 Ohm dummy load.

2. Key the transceiver, and adjust T1012 and T1013 alternately for the maximum indication on the RF millivoltmeter.

3. Connect the frequency counter to T1022 (pin 5).

4. Again key the transceiver in the FM mode (without microphone audio input). Adjust T1018 for a reading of 68.3300 MHz (±50 Hz).

Carrier Balance Adjustment

1. Terminate J1002 with a 50 Ohm dummy load, and connect a spectrum analyzer or a RF millivoltmeter to J1002.

2. Key the transceiver in the USB mode on the 28 MHz band (without microphone input). Adjust VR1001 for the maximum carrier suppression on the spectrum analyzer, or for the minimum indication on the RF millivoltmeter.

VHF TX BPF Adjustment

1. Set the frequency at 145.995 MHz. Connect the RF

millivoltmeter to J1002 terminated by a 50ohm dummy load.

2. Key the transceiver on FM mode and adjust T1011, T1010, and T1009 alternately for the maximum indication on RF millivoltmeter.

UHF TX BPF Adjustment

1. Set the frequency to 439.995 MHz. Connect the RF millivoltmeter to J1002, which still should be terminated by the 50 Ohm dummy load.

2. Key the transceiver in the FM mode, and adjust TC1005, TC1004 and TC1002 alternately for maximum indication on the RF millivoltmeter.

RX Adjustment

The PA Unit must be connected during RX adjustment. Note that the signal generator should not be connected to

J1008 (pin 15) because DC voltage is present there.

RX IF Adjustments

Connect the signal generator to the antenna connector, and a SINAD meter to the speaker jack.

SSB IF Adjustment

1. Connect the DC voltmeter to J1008 (pin 15).

2. Tune the transceiver to 51.995 MHz. Inject an RF signal from the signal generator at a level of 40 dBµ.

3. Adjust T1033, and T1029 alternately for the minimum indication on the DC voltmeter.

4. Now select the FM mode. Turn off the RF injection from the signal generator output.

5. Adjust T1034 for maximum indication on the DC voltmeter.

FM IF Adjustment

1. Tune the transceiver to 51.995 MHz. Inject an RF signal from the signal generator at a level of 10 dBµ, with 1 kHz of FM modulation at ±3.5 kHz deviation.

2. Adjust T1023, T1025, T1028, T1030 and T1034 alternately for the best SINAD sensitivity.

VHF Band Alignment

1. Connect the DC voltmeter to J1008 (pin 15).

2. Tune the transceiver to 145.995 MHz. Inject an RF signal from the signal generator at a level of 40dBµ.

3. Adjust T1002, T1004, and T1008 alternately for the minimum indication on the DC voltmeter.

Alignment

UHF Band Alignment

1. Connect the DC voltmeter to J1008 (pin 15).

2. Tune the transceiver to 439.995 MHz. Inject an RF signal from the signal generator at a level of 40dBµ.

3. Adjust TC1001 for minimum indication on the DC voltmeter.

W-FM Reception Adjustment

1. Connect a SINAD meter to the speaker jack.

2. Tune the transceiver to 88.000 MHz. Inject an RF signal from a signal generator at a level of 30dBµ, with ±22.5KHz deviation of a 1 kHz audio tone.

3. Adjust TC1003 for the best SINAD sensitivity. Then reduce the output level of the signal generator and adjust TC1003 again, as minor improvements of SINAD may be difficult to observe if the SINAD reading is high.

Image Rejection Trap Adjustment

1. Connect the AF millivoltmeter to the speaker jack.

2. Tune the transceiver to 51.995 MHz in the CW mode. Inject an RF signal from the signal generator at 68.330 MHz, with 50dBµ output.

3. Adjust T1014 for minimum indication on the AF millivoltmeter. Then increase the output level of the signal generator slightly, and adjust T1014 again (to ensure maximum rejection).

Noise Blanker Adjustment

1. Connect the DC voltmeter to the base of Q1074. Tune

the transceiver to 51.995 MHz, and inject an RF signal from the signal generator at a level of 6 dBµ.

2. Activate the noise blanker, and adjust T1027 for mini-

mum indication on the DC voltmeter.

T1005 T1012 T1013 T1018

T1022 (Pin 5

T1011

T1014 T1023

T1021

T1025

Q1038 (Pin 5

T1024 T1026

T1020

VR1001

Q1055 (Pin 5

T1029

J1008 (Pin 15

TC1003

TC1005 TC1004 TC1002

)

J1002 T1009 T1010 T1008

T1004 TC1001

T1002 T1028 T1030

T1027 Q1074 (Base

T1034

T1033

)

Alignment

CM Coupler Balance Adjustment

1. Terminate the antenna jack with a 50 Ohm dummy load. Set the mode to CW, and connect the DC voltmeter to J3004 (pin 7).

2. Tune the transceiver to 28.000 MHz, and key the transceiver.

3. Adjust TC3003 for minimum indication on the DC voltmeter.

4. Tune the transceiver to 145.995 MHz (CW), and key the transceiver.

5. Adjust TC3001 for minimum indication on the DC voltmeter.

6. Tune the transceiver to 439.995 MHz (CW), and key the transceiver.

7. Adjust TC3002 for minimum indication on the DC voltmeter.

J3004 (Pin7

)

TC3003 TC3001

TC3002

Alignment

Software Menu Alignment

For all the following alignment procedures, the antenna connector should be connected to a dummy load and wattmeter in all procedures requiring transmission, and the signal generator should be connected when receiver alignment is involved. General alignment conditions are as follows, unless otherwise noted.

AF-gain knob : Center RF-gain knob : Fully clockwise SQL : Fully counterclockwise ATT / IPO / CTCSS / DCS : Off Output power : High AGC : Auto Break-in : On CW Keyer : Off VOX : Off

Entering the Alignment Mode

To enter the Alignment Mode, press and hold in the [A],[B], and [C] keys simultaneously; while holding them in, turn on the transceiver. Once the transceiver comes on, you may release the three keys. Now press and hold in the [F] key for ½ second to activate the Menu, which will be observed to contain a large number of selections not normally available during regular Menu operation.

In the alignment procedures to follow, each alignment item is selected by rotating the SEL knob, while adjustment of the selected alignment parameter is accomplished by rotating the main dial.. Press the [A] key to "set" certain designated parameters where a signal reading is made by the microprocessor (for automatic setting of the parameter).

To store the alignment parameters after all items have been adjusted, press the [F] key for at least ½ second; this will cause the transceiver to save all settings and exit the Menu mode.

RF Gain Adjustment

1. Tune the transceiver to 1.909 MHz (CW mode). Select "01 HF1RXG" in the Alignment Menu by rotating the SEL knob. Now inject an RF signal from the signal generator at 1.909 MHz at about 32dBµ output, and peak the S-meter reading on the incoming signal by rotating the main dial. When the peak is found, reduce the signal generator level to 12 dBµ.

2. Set the parameter "01 HF1RXG," such that the first dot of the S-meter (S1) on the LCD is illuminated, by rotating the main dial. Rotating the main dial adjusts the receiver's IF Gain around 1.9 MHz.

3. The remaining five RF gain adjustment points should be aligned as shown in steps (1) and (2) above. The output levels of the signal generator (for one "dot" of S-meter deflection) at each frequency are shown below.

Frequency Select Menu # Output Level of SG

1.909 MHz 01 HF1RXG 15 dB

7.010 MHz 02 HF2RXG 15 dB

21.105 MHz 03 HF3RXG 12 dB

51.050 MHz 04 50MRXG 3 dB

145.940 MHz 05 VHFRXG 3 dB

440.000 MHz 06 UHFRXG 3 dB

SSB S-Meter Adjustment

1. Tune the transceiver to 21.105 MHz on CW mode. Inject an RF signal from the signal generator at a level of 39dBµ, and peak the S-meter deflection on the incoming signal.

2. Set the parameter "07 SSB-S9" so that exactly 6 dots of the S-meter (S9) appear on the LCD by rotating the main dial.

3. Now inject a signal on the same frequency at a level of 86dBµ.

4. Set the Alignment Menu parameter "08 SSB-FS" such that all the dots of the S-meter on the LCD appear by rotating the main dial.

FM S-Meter Adjustment

1. Tune the transceiver to 145.940 MHz (FM mode). Inject an RF signal from the signal generator at a level of -3 dBµ, with ±3.5 kHz deviation of 1 kHz audio tone.

2. Select Alignment Menu item "09 FM-S1," and press the [A] key to set this parameter.

3. Increase the output level of the signal generator up to 22dBµ. Select Alignment Menu item

"10 FM-FS," and press the [A] key to set this parameter.

FM Center Meter Adjustment

1. Tune the transceiver to 145.937 MHz (FM mode). Inject an RF signal from the signal generator at a level of 10dBµ, with ±3.5 kHz deviation of a 1 kHz audio tone.

2. Set the frequency of the signal generator to 145.934 MHz (3 kHz below the receiving frequency of the transceiver). Select Alignment Menu item "11 DISC-L," and press [A] to set this parameter.

Alignment

3. Tune the transceiver to 145.943 MHz (FM mode). leave the signal generator at 10dBµ output, as before.

4. Set the frequency of the signal generator to 145.946 MHz (3 kHz above the receiving frequency of the transceiver). Select Alignment Menu item "12 DISC-H," and press [A] to set this parameter.

FM Squelch Adjustment

1. Tune the transceiver to 145.940 MHz (FM mode). Confirm that the squelch knob is turned fully counterclockwise.

2. Select Alignment Menu item "13 FM-TH1," and press the [A] key (without any RF input from the signal generator) to set this parameter.

3. Select Alignment Menu item "14 FM-TH2," and press the [A] key again.

4. Inject an RF signal from the signal generator at 3 dBµ output, with ±3.5 kHz deviation FM of a 1 kHz tone. Select Alignment Menu item "15 FM-TI1," and press the [A] key to set this parameter. 5. Select Alignment Menu item "16 FM-TI2," leave the signal generator level unchanged, and press the [A] key again.

Power Supply Voltage Display Adjustment

1. Tune the transceiver to the 144 MHz band (FM mode). Confirm that the power supply voltage is 13.8V ±0.1V (using the DC voltmeter).

2. Select the Alignment Menu item "VCC," and adjust the parameter so that "138" is displayed on the LCD.

Over-Current Protection Adjustment

1. Select Alignment Menu item "18 HF1-IC." Tune the transceiver to the 1.8 MHz band (CW mode), and key the transceiver. Adjust this parameter for 7.0 W of transmission power as measured on the external wattmeter.

2. The over-current protection Alignment Menu items, "19 HF2IC," "20 HF3-IC," "21 50M-IC," "22 VHF-IC," and "23 UHF IC" should be adjusted in the same manner on the 7 MHz, 21 MHz, 50 MHz, 144 MHz, and 430 MHz bands, respectively. Use the CW mode, and the precise frequency is not critical.

RF Power Adjustment

1. Tune the transceiver to the 1.8 MHz band (CW mode). Select Alignment Menu item "24 HF1-HI." Key the transmitter, and adjust this parameter for 5.0 W (±0.1 W) of output power.

2. Select Alignment Menu item "25 HF1-L3." Key the transmitter, and adjust this parameter for 2.5 W (±0.2 W) of

output power.

3. Select Alignment Menu item "26 HF1-L2". Key down and adjust the parameter for 1.0W (±0.2W) transmission power.

4. Select the menu item "27 HF1-L1." Key the transmitter, and adjust this parameter for 0.5 W (±0.1 W) of output power.

5. Other RF power adjustment menu, designated [HF2**], [HF3-**], [50M-**], [VHF-**], and [UHF-**] (four adjustments each) should be adjusted in exactly the same manner on the 7 MHz, 21 MHz, 50 MHz, 144 MHz and 430 MHz bands, respectively. Use the CW mode, and the precise frequency is not critical.

TX Gain Adjustment

1. Select the USB mode. Inject a 1 mV audio signal at 1 kHz from the AF generator into the microphone jack (pin 4).

2. Tune the transceiver to the 1.8 MHz band and key the transmitter. Select Alignment Menu item "48 HF1TXG," and adjust this parameter for 2.5 W (±0.1 W) of output power. Note: to "key the transmitter" with no microphone connected, you may connect pin 3 of the Mic jack to ground (pin 2).

3. The other TX gain Alignment Menu selections, designated [49 HF2TXG], [50 HF3TXG], [51 50MTXG], [52 VHFTXG], and [53 UHFTXG,] should be adjusted in the same manner on the 7 MHz, 21 MHz, 50 MHz, 144 MHz, and 430 MHz bands, respectively.

Power Meter Sensitivity Adjustment

1. Set the mode to CW, and the output power to HIGH. Select Alignment Menu item "54 HF1POM," and key the transceiver.

2. Set this parameter such that 8 dots of the power meter scale are displayed on the LCD.

3. The other power meter sensitivity Alignment Menu selections, designated [55 HF2POM], [56 HF3POM], [57 50MPOM], [58 VHFPOM], and [59 UHFPOM], should be adjusted in the same manner on the 7 MHz, 21 MHz, 50 MHz, 144 MHz, and 430MHz bands, respectively. Use the CW mode, and the precise frequency is not critical.

ALC Meter Adjustment

1. Tune the transceiver to the 21 MHz band on USB. Select Alignment Menu item "60 ALC-1." Key the transceiver (without microphone input), and press the [A] key. A measurement value which microprocessor has computed will displayed on the LCD; make a note of this value.

Alignment

2. Rotate the main dial to set this parameter four digits below the value displayed in step 1.

3. After setting this parameter, confirm that all the dots of the ALC meter have gone out.

4. Select Alignment Menu item "61 ALC-M." Inject a 4.0 mV AF signal at 1 kHz from the audio generator to the microphone jack (pin 4), and key the transceiver.

5. Press the [A] key, and confirm that 5 dots on the ALC meter scale are present.

Reverse ALC Adjustment

1. Set the mode to CW, and connect the 150-Ohm dummy load to the antenna connector. Tune the transceiver to the 1.8 MHz band, and select Alignment Menu item "62 HF1-RV."

2. Key the transceiver, and set the parameter such that 6 dots of the power meter scale appear on the LCD.

3. The other reverse ALC adjustment menu, designated [63 HF2-RV], [64 HF3-RV], [65 50M-RV], [66 VHF-RV, and [67 UHF-RV], should be adjusted in the same manner on the 7 MHz, 21 MHz, 50 MHz, 144 MHz, and 430 MHz bands, respectively. Use the CW mode, and the precise frequency is not critical.

Carrier Level Adjustment

1. Tune the transceiver to the 21 MHz band. Connect the 50-Ohm dummy load to the antenna connector. Set the mode to CW. Select Alignment Menu item "68 CWCAR," and key the transceiver.

2. Set this parameter such that 5 dots of the ALC meter scale appear on the LCD.

3. Connect the oscilloscope to the antenna connector via an appropriate attenuator.

4. Set the mode on AM. Select Alignment Menu item "69 AM-CAR." Inject a 1.0 mV audio signal at 1 kHz from the audio generator into the microphone jack (pin 4).

5. Key the transceiver, and adjust this parameter for 33% (AM) modulation on the oscilloscope.

3. Change the menu item to "71 DEV-N." Key the transceiver, and adjust this parameter for a maximum deviation of ±2.25 kHz (±0.1 kHz) on the FM linear detector.

4. Change the menu item to "72 M-MTR." Key the transceiver, and set this parameter such that 5 dots of the MOD meter scale appear on the LCD.

5. Change the menu item to "73 CTCSS." Key the transceiver without microphone input, and adjust this parameter for a maximum deviation of ±0.7 kHz (±0.1 kHz) on the FM linear detector.

6. Change the menu item to "74 DCS." Key the transceiver without microphone input, and adjust the parameter for a maximum deviation of ±0.7 kHz (±0.2 kHz) on the FM linear detector.

SSB Carrier Point Adjustment

1. Tune the transceiver to the 21 MHz band. Select Alignment Menu item "75 LSB-CP." Set the mode to LSB, and inject a 1 mV AF from an audio generator into the microphone jack (pin 4).

2. Key the transmitter, and vary the audio frequency of the audio generator to find the frequency at which you achieve the maximum output power of the transceiver. Confirm that the output power is at least 2.5W; then adjust the AF output level of the audio generator for

2.0 W (±0.1 W) output power from the transceiver.

3. Lower the audio frequency down to 400 Hz, and adjust this parameter for 0.6 W (±0.1 W) output power from the transceiver.

4. Change the audio frequency to 2600 Hz, and confirm that the output power is at least 0.5 W.

5. The adjustment for the USB carrier point is performed in the same manner as done for LSB, by changing the transmission mode to USB and the Alignment Menu item to "76 USB-CP."

FM Modulation Adjustment

1. Tune the transceiver to the 144 MHz band (FM mode). Connect the FM linear detector to the antenna connector via an appropriate attenuator. Select Alignment Menu item "70 DEV-W." Inject a 15 mV audio signal at 1 kHz from the audio generator to the microphone jack (pin 4).

2. Key the transceiver, and adjust this parameter for a maximum deviation of ±4.5 kHz (±0.2 kHz) on the FM linear detector.

Alignment

Note:

Interconnection Diagram

Note:

MAIN Unit

439.95 MHz: -9.0 dBµ

145.95 MHz: -9.0 dBµ

52.00 MHz: -4.1 dBµ

14.00 MHz: -5.2 dBµ

128 MHz: +13.5 dBµ

145.95 MHz: +15.5 dBµ

145.95 MHz: +18.5 dBµ

USB mode: (54 mVrms)

USB mode: (350 mVrms)

200 mVrms

USB mode: (40 mVrms)

68.33 MHz: +6.1 dBµ

700 mVrms

68.33 MHz: +0.6 dBµ

455 kHz (CW mode)*: +94 dBµ

455 kHz: +36 dBµ 455 kHz: +28.5 dBµ

455 kHz (CW mode)*: +87 dBµ

455 kHz (CW mode)*: +21.5 dBµ

439.95 MHz: +21.5 dBµ

70 mVrms

90 mVrms

600 mVrms

250 mVrms

455 kHz: +54 dBµ

455 kHz (CW mode)*: +68 dBµ

USB mode: (2.5 mVrms)

USB mode: (5.0 mVrms)

USB mode: (120 mVrms)

USB mode: (130 mVrms)

FM mode: (80 mVrms)

USB mode: (1.0 mVrms) FM mode: (1.0 mVrms)

USB mode: (100 mVrms) FM mode: (150 mVrms)

USB mode: (220 mVrms) FM mode: (220 mVrms)

FM mode: (1.0 mVrms)

FM mode: (450 mVrms)FM mode: (100 mVrms)

FM mode: (150 mVrms)

FM mode: (500 mVrms)

FM mode: (11 mVrms)

USB mode: (30 mVrms)

RX (TX) RX: 145.95 MHz (MOD: f=1 kHz, DEV=3.5 kHz) FM: 12 dB SINAD *CW: S/N 10 dB TX: 145.95 MHz, 5 W (connected to a 50-ohm dummyload) (MIC Imput: f=1 kHz, level= 3 mVrms)

USB mode: (110 mVrms) FM mode: (210 mVrms)

MAIN Unit

Note:

Parts Layout

A B C D

MAIN Unit

UMD3N (D3)

(Q1012)

2SC4154 (LE)

(Q1018, 1024, 1074, 1078,

1079, 1089, 1091, 1092, 1111)

2SC4400 (RT4)

(Q1015)

2SB1182F5

(Q1082)

2SB1132 (Q 1102)

TDA7233D

(Q1070)

DTA114EU (14)

(Q1020)

TA75S01F (SA)

(Q1108)

CXA1611N

(Q1025)

SN16913P

(Q1038, 1055, 1087)

2SA1602A (MF)

(Q1105, 1112)

DTC144EU (26)

(Q1109)

Side A

GN2011 (4W)

(D1047)

DAP236U (X)

(D1001, 1004, 1030)

MAIN Unit

a b

c d

UPC2170T (C1F)

(Q1001)

2SC4154 (LE)

(Q1002, 1016, 1017, 1019, 1026, 1034, 1036, 1037, 1044, 1048, 1050, 1053, 1054, 1056, 1063,

1066, 1067, 1076, 1080,

1081, 1107, 1110)

2SC5374 (NA)

(Q1008)

2SC4400 (RT4)

(Q1023, 1027, 1028, 1029,

1030, 1033, 1047)

2SB624 (BV3) (Q1041, 1043)

BB304CDW (DW)

(Q1003, 1006, 1007,

1051, 1065, 1075)

UMH6N (H6)

(Q1004, 1009, 1010)

BU4094BCFV (Q1021, 1022)

AD9835BUR

(Q1031)

BA4116FV

(Q1069)

BU4053BCFV

(Q1073)

M62353GP

(Q1077)

BB301CAW (AW)

(Q1040, 1052, 1061)

UMG2N (G2)

(Q1042)

2SD2211 (DQR)

(Q1046)

M62364FP

(Q1071)

TC4W53FU

(Q1072)

DTC144EU (26)

(Q1083, 1084, 1085,

1086, 1100, 1106)

BA05FP (Q)

(Q1088)

NJM2904V

(Q1098)

2SB1182F5

(Q1101)

2SB1132

(Q1090)

DAP236U (X)

(D1003, 1009, 1010, 1011,

1018, 1029, 1031, 1032,

1040, 1041, 1045)

DAP222 (P)

(D1054, 1069, 1070, 1075,

1076, 1078, 1079, 1087)

1SS302 (C3)

(D1005, 1064)

1SS372 (N9)

(D1062, 1068)

DA221 (K)

(D1043, 1050, 1065)

DAN222 (N)

(D1053, 1061, 1074,

1080, 1082)

DAN235U (M)

(D1048, 1058, 1059)

2SK2685ZT (WV-)

(Q1005)

UMC5N (C5)

(Q1011, 1013, 1032,

1039, 1045)

2SA1602A (MF)

(Q1035, 1042, 1103)

2SB624 (BV3) (Q1041, 1043)

BU4066BF

(Q1049, 1057)

NJM2902V

(Q1093, 1094, 1095,

1096, 1097)

2SK302 (TY)

(Q1060, 1062)

TC4S66F (C9)

(Q1068)

DTC114EU (24)

(Q1099)

2SJ355 (PQ)

(Q1104)

HZM10B2 (29)

(D1073)

HSB88WSTR

(D1049)

Side B

68.33 MHz: +6.1 dBµ

MAIN Unit (Lot. 30~)

439.95 MHz: -9.0 dBµ

145.95 MHz: -9.0 dBµ

52.00 MHz: -4.1 dBµ

14.00 MHz: -5.2 dBµ

128 MHz: +13.5 dBµ

145.95 MHz: +15.5 dBµ

145.95 MHz: +18.5 dBµ

USB mode: (54 mVrms)

USB mode: (350 mVrms)

200 mVrms

USB mode: (40 mVrms)

700 mVrms

68.33 MHz: +0.6 dBµ

455 kHz (CW mode)*: +94 dBµ

455 kHz: +36 dBµ 455 kHz: +28.5 dBµ

455 kHz (CW mode)*: +87 dBµ

455 kHz (CW mode)*: +21.5 dBµ

439.95 MHz: +21.5 dBµ

70 mVrms

90 mVrms

600 mVrms

250 mVrms

455 kHz: +54 dBµ

455 kHz (CW mode)*: +68 dBµ

USB mode: (2.5 mVrms)

USB mode: (5.0 mVrms)

USB mode: (120 mVrms)

USB mode: (130 mVrms)

FM mode: (80 mVrms)

USB mode: (1.0 mVrms) FM mode: (1.0 mVrms)

USB mode: (100 mVrms) FM mode: (150 mVrms)

USB mode: (220 mVrms) FM mode: (220 mVrms)

FM mode: (1.0 mVrms)

FM mode: (450 mVrms)FM mode: (100 mVrms)

FM mode: (150 mVrms)

FM mode: (500 mVrms)

FM mode: (11 mVrms)

USB mode: (30 mVrms)

USB mode: (110 mVrms) FM mode: (210 mVrms)

RX (TX) RX: 145.95 MHz (MOD: f=1 kHz, DEV=3.5 kHz) FM: 12 dB SINAD *CW: S/N 10 dB TX: 145.95 MHz, 5 W (connected to a 50-ohm dummyload) (MIC Imput: f=1 kHz, level= 3 mVrms)

MAIN Unit (Lot. 30~)

Note:

+ 72 hidden pages

Yaesu FT-817 Service Manual

Introduction

Contents

Specifications

Exploded View & Miscellaneous Parts

Block Diagram

Circuit Description

Receive Signal Circuitry

Transmit Signal Circuitry

Control Circuitry

Alignment

Introduction

Required Test Equipment

Alignment Preparation & Precautions

Local Oscillator Adjustment

PLL Adjustment

Local Oscillator Adjustment

TX IF Adjustment

CM Coupler Balance Adjustment

Software Menu Alignment

Interconnection Diagram

MAIN Unit

Parts Layout