Icom Ic-7700 User manual

S-14407XZ-C1

Feb. 2008

HF/50MHz TRANSCEIVER

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This service manual describes the latest service information

for the IC-7700 HF/50MHz TRANSCEIVER at the time of

publication.

NEVER connect the transceiver to an AC outlet or to a DC

power supply that uses more than specifed. This will ruin

the transceiver.

DO NOT expose the transceiver to rain, snow or any liquids.

DO NOT reverse the polarities of the power supply when

connecting the transceiver.

DO NOT apply an RF signal of more than 20 dBm (100 mW) to

the antenna connector. This could damage the transceiver’s

front-end.

To upgrade quality, any electrical or mechanical parts and

internal circuits are subject to change without notice or

obligation.

MODEL VERSION

IC-7700

USA

EUR

FRA

ITR

ESP

KOR

Be sure to include the following four points when ordering

replacement parts:

1. 10-digit Icom parts numbers

2. Component name

3. Equipment model name and unit name

4. Quantity required

1110003491 S.IC TA31136FNG IC-7700 MAIN UNIT 5 pieces

8820001210 Screw 2438 screw IC-7700 Top cover 10 pieces

Addresses are provided on the inside back cover for your

convenience.

of Icom Incorporated (Japan) in the United States, the United

tries.

ORDERING PARTS

1. Make sure the problem is internal before disassembling

the transceiver.

2. DO NOT open the transceiver until the transceiver is

disconnected from its power source.

3. DO NOT force any of the variable components. Turn

them slowly and smoothly.

4. DO NOT short any circuits or electronic parts. An

insulated tuning tool MUST be used for all adjustments.

5. DO NOT keep power ON for a long time when the

transceiver is defective.

6. DO NOT transmit power into a Standard Signal

Generator or a Sweep Generator.

7. ALWAYS connect a 50 dB to 60 dB attenuator between

the transceiver and a Deviation Meter or Spectrum

Analyzer when using such test equipment.

8. READ the instructions of test equipment throughly

before connecting a test equipment to the transceiver.

REPAIR NOTES

INTRODUCTION CAUTION

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CONTENTS

SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE VIEWS

SECTION 3 CIRCUIT DESCRIPITON

3-1 RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3-3 FREQUENCY SYNTHESIZER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

3-4 MAIN CPU PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

SECTION 4 ADJUSTMENT PROCEDURES

4-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4-2 ADJUSTMENTS ON THE OSC UNIT AND PLL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4-3 ADJUSTMENTS ON THE RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

4-4 ADJUSTMENTS ON THE PA200W BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

4-5 ADJUSTMENTS ON THE MAIN UNIT (including RF UNIT). . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

4-6 ADJUSTMENTS ON THE SCOPE UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

4-7 AUTOMATIC ADJUSTMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

SECTION 5 PARTS LIST

SECTION 6 MECHANICAL PARTS

SECTION 7 BOARD LAYOUTS

SECTION 8 GENERAL WIRING

SECTION 9 BLOCK DIAGRAM

SECTION 10 SCHEMATIC DIAGRAM

FRONT UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2

MAIN UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8

PLL UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12

OSC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13

ANT-SW UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16

DIGISEL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16

RF UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17

NETWORK BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22

CTRL BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23

FILTER UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24

PA200W BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25

SCOPE UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-26

DC-DC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-29

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SECTION 1 SPECIFICATIONS

General

• Frequency coverage (unit: MHz) :

Receiver 0.030000–60.000000*1

Transmitter 1.800000–1.999999*2, 3.500000–3.999999*2,

5.330500*3, 5.346500*3, 5.366500*3, 5.371500*3,

5.403500*3, 7.000000–7.300000*2,

10.100000–10.150000*2, 14.000000–14.350000*2,

18.068000–18.168000*2, 21.000000–21.450000*2,

24.890000–24.990000*2, 28.000000–29.700000*2,

50.000000–54.000000*2

*1Some frequency ranges are not guaranteed.

*2Depending on versions. *3USA version only.

• Operating mode : USB, LSB, CW, RTTY, PSK31, AM, FM

• Number of memory channels : 101 (99 regular, 2 scan edges)

• Antenna connector : SO-239×4 (antenna impedance: 50 1)

• Operating temperature range : 0˚C to +50˚C; +32˚F to +122˚F

• Frequency stability : Less than ±0.05 ppm (approx. 5 min. after from turn

the main power, [I/O], ON, 0–50˚C; 32–122˚F)

• Frequency resolution : 1Hz

• Power supply requirement : 85–265 V AC (universal input)

• Power consumption :

Receive Stand-by 200 VA typical

Max. audio 210 VA typical

Transmit at 200 W 800 VA

• Dimensions (projections not included) :425×149×437 mm; 1623⁄32×57⁄8×177⁄32 in

• Weight : Approx. 22.5 kg; 50 lb

• ACC 1 connectors : 8-pin DIN connector

• ACC 2 connectors : 7-pin DIN connector

• Display*:7-inch (diagonal) TFT color LCD (800×480)

• EXT-DISPLAY connector : D-sub 15S

• CI-V connector : 2-conductor 3.5 (d) mm (1⁄8w)

• RS-232C connector : D-sub 9-pin

• USB connector : USB (Universal Serial Bus)1.1/2.0×2

Transmitter

• Transmit output power :

SSB, CW, RTTY, PSK31, FM

5–200 W

AM 5–50 W

• Modulation system :

SSB D.P.S.N. modulation

AM Digital low power modulation

FM Digital phase modulation

• Spurious emission :

Harmonics More than 60 dB (HF bands)

More than 70 dB (50 MHz band)

Unwanted emission More than 50 dB (HF bands)

(except Harmonics) More than 66 dB (50 MHz band)

Out of band emission More than 40 dB (HF bands)

More than 60 dB (50 MHz band)

• Carrier suppression : More than 63 dB

• Unwanted side-band suppression : More than 80 dB

•

∂

TX variable range : ±9.999 kHz

• Microphone connector : 8-pin connector (600 1)

• ELEC-KEY connector : 3-conductor 6.35 (d) mm (1⁄4w)

• KEY connector : 3-conductor 6.35 (d) mm (1⁄4w)

• RELAY connector : Phono (RCA)

• ALC connector : Phono (RCA)

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Receiver

•Receive system : Double conversion superheterodyne system

•Intermediate frequencies :

1st 64.455 MHz

2nd 36 kHz

•Sensitivity (typical) :

SSB, CW, RTTY (BW=2.4 kHz, 10 dB S/N)

0.100000– 1.799999 MHz 0.5 µV (pre-amp 1 ON)

1.800000–29.990000 MHz 0.16 µV (pre-amp 1 ON)

50.000000–54.000000 MHz 0.13 µV (pre-amp 2 ON)

AM (BW=6 kHz, 10 dB S/N)

0.100000– 1.799999 MHz 6.3 µV (pre-amp 1 ON)

1.800000–29.990000 MHz 2 µV (pre-amp 1 ON)

50.000000–54.000000 MHz 1 µV (pre-amp 2 ON)

FM (BW=15 kHz, 12 dB SINAD)

28.000000–29.990000 MHz 0.5 µV (pre-amp 1 ON)

50.000000–54.000000 MHz 0.32 µV (pre-amp 2 ON)

• Internal Modulate Distortion (typical) :Dynamic range 109 dB

(at 14.100 MHz, 100 kHz separation, pre-amp OFF,

CW mode; BW=500 Hz)

• Selectivity :

SSB, RTTY (BW=2.4 kHz) More than 2.4 kHz/–3 dB

Less than 3.6 kHz/–60 dB

CW (BW=500 Hz) More than 500 Hz/–3 dB

Less than 700 Hz/–60 dB

AM (BW=6 kHz) More than 6.0 kHz/–3 dB

Less than 15.0 kHz/–60 dB

FM (BW=15 kHz) More than 12.0 kHz/–6 dB

Less than 20.0 kHz/–60 dB

• Spurious and image rejection ratio : More than 70 dB

• Squelch sensitivity (pre-amp OFF) :

SSB, CW, RTTY, PSK31 Less than 5.6 µV

FM Less than 1 µV

• RIT variable range : ±9.999 kHz

• Audio output power : More than 2.6 W at 10% distortion with an 8 1load

• PHONES connector : 3-conductor 6.35 (d) mm (1⁄4w)

• EXT-SP connectors : 2-conductor 3.5 (d) mm (1⁄8w)/8 1

Antenna tuner

• Matching impedance range : 16.7 to 150 1unbalanced

(HF bands; VSWR better than 3:1)

20 to 125 1unbalanced

(50 MHz band; VSWR better than 2.5:1)

• Minimum operating input : 8W(HF bands)

15 W (50 MHz band)

• Tuning accuracy : VSWR 1.5:1 or less

• Insertion loss (after tuning) :Less than 1.0 dB

All stated specifications are typical and subject to change without notice or obligation.

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V0V5V10V15V20V25V30V35V40V45V50V55V60V65V70V75V80V85V90V95V100

H0 H5 H10 H15 H20 H25 H30 H35 H40 H45 H50 H55 H60 H65 H70 H75 H80 H85 H90 H95 H100 H105 H110 H115 H120 H125 H130 H135 H140 H145 H150 H155 H160 H165 H170 H175 H180 H185 H190