Yaesu FT-991A Manual

HF/VHF/UHF ALL MODE TRANSCEIVER

FT-991

Introduction

This manual provides the technical information necessary

for servicing the FT-991A HF/VHF/UHF ALL MODE

TRANSCEIVER.

Servicing this equipment requires expertise in hand-

ing surface-mount chip components. Attempts by non-

qualied persons 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 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 typographical or other errors

that may be present. Your cooperation in pointing out

any inconsistencies in the technical information would

be appreciated.

Important Note

This transceiver was assembled using Pb (lead) free solder, based on the RoHS specication.

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 specication, and any solder with the above alloy com-

position may be used.

Caution

Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries according to the instructions.

Technical Supplement

EH067M90B

Contents

Specications

Exploded View & Miscellaneous Parts

Block Diagram

Connection Diagram

Alignment

Board Unit (Schematics, Layouts & Parts)

MAIN Unit

PLL Unit

EDSP Unit

CNTL Unit

HF-PA Unit

V_U-PA Unit

PANEL Unit

TUNER Unit

JACK Unit

SCP Unit

DSP Unit

FT-991 Technical Supplement

Specications

SPECIFICATIONS-1

General

Rx Frequency Range: 30 kHz - 56 MHz, 118 MHz - 164 MHz, 420 MHz - 470 MHz (operating)

1.8 MHz - 54 MHz, 144 MHz - 148 MHz, 430 MHz - 450 MHz (specied

performance, Amateur bands only)

Tx Frequency Ranges: 1.8 MHz - 54 MHz, 144 MHz - 148 MHz, 430 MHz - 450 MHz (Amateur

bands only)

Frequency Stability: ±0.5 ppm (after 1 minute @+14 °F to +122 °F [–10 °C to +50 °C])

Operating Temperature Range: +14 °F to +122 °F (–10 °C to +50 °C)

Emission Modes: A1A (CW), A3E (AM), J3E (LSB, USB), F3E (FM), F7W (C4FM), F2D

Frequency Steps: 5/10 Hz (SSB, CW, & AM), 100 Hz (FM, C4FM)

Antenna Impedance: 50 Ohms, unbalanced

16.7 - 150 Ohms, unbalanced (Tuner ON, 1.8 MHz - 30 MHz Amateur

bands)

25 - 100 Ohms, unbalanced (Tuner ON, 50 MHz Amateur band)

Power Consumption (Approx.): Rx (no signal) 1.8 A

Rx (signal present) 2.2 A

Tx 23 A (HF/50 MHz 100 W)

15 A (144/430 MHz 50 W)

Supply Voltage: DC 13.8 V ± 15% (Negative Ground)

Dimensions (WxHxD): 9.0” x 3.2” x 10.0” (229 x 80 x 253 mm)

Weight (Approx.): 9.5 lbs (4.3 kg)

Transmier

Power Output: 5 - 100 was (2 - 25 was AM carrier)

Modulation Types: J3E (SSB): Balanced,

A3E (AM): Low-Level (Early Stage),

F3E (FM): Variable Reactance

F7W (C4FM): 4-level FSK

Maximum FM Deviation: ±5.0 kHz/±2.5 kHz

Harmonic Radiation: Beer than –50 dB (1.8 MHz - 30 MHz Amateur bands)

Beer than –63 dB (30 MHz Amateur band)

Beer than –60 dB (144 MHz, 430 MHz Amateur bands)

SSB Carrier Suppression: At least 50 dB below peak output

Undesired Sideband Suppression: At least 50 dB below peak output

Bandwidth: 3 kHz (LSB/USB), 500 Hz (CW), 6 kHz (AM), 16 kHz (FM/C4FM)

Audio Response (SSB): Not more than –6 dB from 300 to 2700 Hz

Microphone Impedance: 600 Ohms (200 to 10 kOhms)

FT-991 Technical Supplement

Specications

SPECIFICATIONS-2

Receiver

Circuit Type: SSB/CW/AM: Triple-conversion Superheterodyne

FM/C4FM: Double-conversion Superheterodyne

Intermediate Frequencies: 40.455 MHz

SSB/CW/AM: 69.450 MHz/9.000 MHz/24 kHz

FM/C4FM: 69.450 MHz/450 kHz

Sensitivity: SSB/CW (BW: 2.4 kHz, 10 dB S+N/N)

0.158 µV (1.8 - 30 MHz) (AMP 2 “ON”)

0.125 µV (50 - 54 MHz) (AMP 2 “ON”)

0.11 µV (144 - 148 MHz)

0.11 µV (430 - 450 MHz)

AM (BW: 6 kHz, 10 dB S+N/N, 30 % modulation @400 Hz)

5 µV (0.5 - 1.8 MHz) (AMP 2 “ON”)

1.6 µV (1.8 - 30 MHz) (AMP 2 “ON”)

1.25 µV (50 - 54 MHz) (AMP 2 “ON”)

FM (BW: 15 kHz, 12 dB SINAD)

0.35 µV (28 - 30 MHz) (AMP 2 “ON”)

0.35 µV (50 - 54 MHz) (AMP 2 “ON”)

0.18 µV (144 - 148 MHz)

0.18 µV (430 - 440 MHz)

There is no specication for frequency ranges not listed.

Squelch Sensitivity (TYP.): SSB/CW/AM

1.0 µV (1.8 - 30 MHz, 50 - 54 MHz) (AMP 2 “ON”)

1.0 µV (144 - 148 MHz, 430 - 450 MHz)

0.35 µV (28 - 30 MHz, 50 - 54 MHz) (AMP 2 “ON”)

0.125 µV (144 - 148 MHz, 430 - 450 MHz)

There is no specication for frequency ranges not listed.

Selectivity: Mode –6 dB –60 dB

CW/RTTY/PKT 0.5 kHz or beer 750 Hz or less

SSB 2.4 kHz or beer 3.6 kHz or less

AM 6 kHz or beer 15 kHz or less

FM 12 kHz or beer 30 kHz or less (–50 dB)

Image Rejection: 70 dB or beer (1.8 MHz - 50 MHz Amateur bands)

60 dB or beer (144/430 MHz Amateur band)

Maximum Audio Output: 2.5 W into 4 Ohms with 10% THD

Audio Output Impedance: 4 to 8 Ohms (4 Ohms: nominal)

Conducted Radiation: Less than 4 nW

Specications are subject to change, in the interest of technical improvement, without notice or obligation,

and are guaranteed only within the amateur bands.

EXPLODED VIEW-1 FT-991 Technical Supplement

Exploded View

RA600120A

TOP CASE

R4150130

HANDLE END

R3520660A

HANDLE

RA089840A

SP NET

①

REF. YAESU P/N Description Qty.

①U31306007 OVAL HEAD SCREW M3X6B 8

②U24206001 BIND HEAD TAPTITE-B M2.6X6 12

③U31206007 OVAL HEAD SCREW M2.6X6B 4

④U31415007 OVAL HEAD SCREW M4X15B 2

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

①

③

②

④

R7153663

HIMERON

RA6024400

PORON SHEET(6x25)

M4090229

SP 66S-A3627

RA131710A

SPONGE RUBBER(SP-CE)

RA0994000

PORON SHEET(151505)

RA6017300

SPONGE RUBBER(10x98)

RA6000700

SHIELD CASE COVER

RA1550600

SP HOLDER(H034M)

③

②

②②

②

①

②

RA6032500

DOUBLE FACE (19x9)

②

S5000260

LEAD CLAMP

RA6032300

HEATSINK

RA6046900

BLIND SHEET (0715)

RA6033500

GASKET (10x20)

RA6033500

GASKET (10x20)

RA123330A

SHEEET

RA0471500

ELEC. COND TAPE(C)

EXPLODED VIEW-2 FT-991 Technical Supplement

Exploded View

REF. YAESU P/N Description Qty.

①U31306007 OVAL HEAD SCREW M3X6B 9

②U20406007 BINDING HEAD SCREW M4X6B 2

③U30305002 FLAT HEAD SCREW M3X5NI 4

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

RA600110A

BOTTOM CASE

S4000052

CASE LEG FF-004-AR791

R3100700A

FOOT

①

①①

②

R7153663

HIMERON

RA1236600

PORON SHEET(10X10t3)

RA6101700

GASKET(70x40)

RA6024400

PORON SHEET(6x25)

RA6000800

SHIELD CASE COVER

③

RA0423200

LOCK PLATE

RA6033500

GASKET (10x20)

RA089560A

GASKETW9H4L40

R0145630

STAND

EXPLODED VIEW-3 FT-991 Technical Supplement

Exploded View

①

RA6003400

LCD SPACER(57B)

JACK-UNIT

RA6025300

BLIND SHEET(9x28)

RA6025300

BLIND SHEET(9x28)

RA6107900

FRONT PANEL(PRT)

RA6018200

NAME PLATE

RA6003200

WINDOW(LED)

RA6003600

RUBBER KNOB(H057)

RA6003500

RUBBER KNOB(PWR)

RA1340000

LCD SPACER (A)

Q7000653

LCD MODULE

①

REF. YAESU P/N Description Qty.

①U24108001 BIND HEAD TAPTITE-B M2X8(3) 13

②U24206001 BIND HEAD TAPTITE-B M2.6X6 2

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

PANEL-UNIT

①

①①

①

RA6004500

RUBBER RING(MAIN)

RA6004200

KNOB MAIN ASSY

RA152820A

WASHER(FELT)

RA1528400

WASHER(PE)

RA0979300

HOLDER(SPRING)

U9900211

WAVE WASHER WW-16011(SUS)

RA6004600

KNOB SKIRT

②

U70015001

PLAIN WASHER FW9X14X0.5

U62009001

VOLUME NUT 9X12X2

Q9001000

ROTARY ENCODER

RA6003700

KNOB ASSY(VOL)

RA6004000

KNOB ASSY (ENC)

ø1

ø2

ø1

ø2

ø1

ø2

ø1

ø2

J60800322

POT (w/ ø1, ø2)

Q9000996

ROTARY ENCODER (w/ ø1, ø2)

Q9000758

ROTARY ENCODER (w/ ø1, ø2)

RA6030000

GASKET(8x10)

RA6054500

PORON SHEET(10x3.5) (2 pcs)

RA6035100

LEAF SPRING

EXPLODED VIEW-4 FT-991 Technical Supplement

Exploded View

RA602550A

PORON SHEET (10x85)

RA602540A

PORON SHEET (10x115)

RA600030A

CHASSIS

RA1558800

GASKET(60x12)

RA6015300

GASKET(120x10)

EDSP-UNIT

CNTL-UNIT

DSP-UNIT

RA6001000

RUBBER PACKING

RA1391800

SPACER(DSP)

RA6000900

SHIELD CASE COVER

RA1499500

PORON SHEET(25x35)

①

②

③

①

REF. YAESU P/N Description Qty.

①U34206001 FLAT HEAD TAPTITE-B M2.6X6 6

②U24206001 BIND HEAD TAPTITE-B M2.6X6 10

③U24208007 BIND HEAD TAPTITE-B M2.6X8B 1

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

②

RA0060200

SHIELD CASE

RA1559100

GASKET(5x12) (3 pcs)

EXPLODED VIEW-5 FT-991 Technical Supplement

Exploded View

RA6000400

DISPLAY PANEL

RA6049000

Thermal Conductive Pad

P1091158A (CE OFF)

P1090547 (CE ON)

CONNECTOR

P1091158A

CONNECTOR

S5000236 (CE ON)

LUG WASHER FOR MDR-2

RA0415200

GROUND PLATE (4 pcs)

RA6035100

LEAF SPRING

⑤

④

⑥

⑦

①

②

③

①

REF. YAESU P/N Description Qty.

①U24206001 BIND HEAD TAPTITE-B M2.6X6 26

②U24208007 BIND HEAD TAPTITE-B M2.6X8B 3

③U03310002 SEMS SCREW ASM3X10NI 8

④U03306002 PAN HEAD SCREW ASM3X6NI 4

⑤U04333007 SEMS SCREW HSM3X33B 4

⑥U24306001 BIND HEAD TAPTITE-B M3X6 4

⑦U04410002 SEMS SCREW HSM4X10NI 1

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

②

③

S5000331

TERMINAL

④

③

①

①①

①

①①

①

⑤

S5000320

FAN GUARD

M2090052

FAN

⑥

RA6032400

Thermal Conductive Pad

HF-PA-UNIT

V_U-PA-UNIT

R0131680

SHIELD COVER

R0131670A

SHIELD CASE

EXPLODED VIEW-6 FT-991 Technical Supplement

Exploded View

RA6015400

GASKET(80x10)

MAIN-UNIT

RA1152200

SHIELD CASE(28x15)

RA0830300

SHIELD CASE(21X25)

RA0659300

SHIELD CASE

RA6002100

SHIELD PLATE

PLL-UNIT

RA6001700

SHIELD CASE COVER

REF. YAESU P/N Description Qty.

①U03306002 PAN HEAD SCREW ASM3X6NI 4

②U24206001 BIND HEAD TAPTITE-B M2.6X6 9

③U24306001 BIND HEAD TAPTITE-B M3X6 5

④U20205001 BINDING HEAD SCREW M2.6X5 3

⑤S5000414 SPACER QBSB2613E 3

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

①

②

③

①

RA1152400

SHIELD CASE COVER

RA0830400

SHIELD CASE COVER

RA1152300

SHIELD CASE COVER

②

RA6025200

Thermal Conductive Pad

RA6025100

Thermal Conductive Pad

③

S5000260

LEAD CLAMP CC-1002

RA6032400

Thermal Conductive Pad

TUNER-UNIT

RA6110000

SHIELD CASE(21X25.5)

④

④④

⑤

SCP-UNIT

RA6108900

GASKET

RA6115000

GASKET

BLOCK DIAGRAM-1 FT-991 Technical Supplement

Block Diagram

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