Icom -- i706MK G.pdf

SERVICE

MANUAL

HF/VHF/UHF ALL MODE TRANSCEIVER

i706MKªG

INTRODUCTION

DANGER

This service manual describes the latest service information

for the IC-706MK II G HF/VHF/UHF ALL MODE TRANS-

CEIVER at the time of publication.

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

power supply that uses more than 16 V.

This will ruin the

transceiver.

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

VERSION NO.

#02, #12

#03, #13

#04, #14

#05, #15

#08, #18

VERSION

Europe

France

Spain

U.S.A.

Other

SYMBOL

EUR

FRA

ESP

USA

OTH

DO NOT reverse the polarities of the power supply when con-

necting the transceiver.

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

to the antenna connector.

This could damage the trans-

ceiver’s front end.

To upgrade quality, any electrical or mechanical parts and

internal circuits are subject to change without notice or

obligation.

ORDERING PARTS

REPAIR NOTES

Make sure a problem is internal before disassembling the

transceiver.

Be sure to include the following four points when ordering

replacement parts:

DO NOT open the transceiver until the transceiver is

disconnected from its power source.

1. 10-digit order numbers

2. Component part number and name

3. Equipment model name and unit name

4. Quantity required

DO NOT force any of the variable components.

Turn

them slowly and smoothly.

DO NOT short any circuits or electronic parts. An insu-

lated tuning tool MUST be used for all adjustments.

1110004080 S.IC µPC2709T IC-706MK II G MAIN UNIT 0 5 pieces

8810009020 Screw FH M2.6 x 5 ZK IC-706MK II G Top cover

DO NOT keep power ON for a long time when the trans-

ceiver is defective.

10 pieces

DO NOT transmit power into a signal generator or a

sweep generator.

Addresses are provided on the inside back cover for your

convenience.

ALWAYS connect a 50 dB to 60 dB attenuator between

the transceiver and a deviation meter or spectrum ana-

lyzer when using such test equipment.

READ the instructions of test equipment thoroughly

before connecting equipment to the transceiver.

TABLE OF CONTENTS

SECTION 1

SPECIFICATIONS

SECTION 2

INSIDE VIEWS

SECTION 3

CIRCUIT DESCRIPTION

3 - 1

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

3 - 2

TRANSMITTER CIRCUITS ......................................................................................................................... 3 - 4

3 - 3

PLL CIRCUITS ............................................................................................................................................ 3 - 6

3 - 4

LOGIC CIRCUITS ....................................................................................................................................... 3 - 8

SECTION 4

ADJUSTMENT PROCEDURES

4 - 1

PREPARATION BEFORE SERVICING ...................................................................................................... 4 - 1

4 - 2

PLL ADJUSTMENTS. .................................................................................................................................. 4 - 2

4 - 3

TRANSMITTER ADJUSTMENTS ............................................................................................................... 4 - 2

4 - 4

RECEIVER ADJUSTMENTS. ...................................................................................................................... 4 - 8

4 - 5

SET MODE ADJUSTMENT. ...................................................................................................................... 4 - 10

SECTION 5

PARTS LIST

SECTION 6

MECHANICAL PARTS AND DISASSEMBLY

SECTION 7

SEMI-CONDUCTOR INFORMATION

SECTION 8

BOARD LAYOUTS

8 - 1

DISPLAY BOARD. ....................................................................................................................................... 8 - 1

8 - 2

MAIN BOARD. ............................................................................................................................................. 8 - 3

8 - 3

HPF AND DRIVER BOARD ........................................................................................................................ 8 - 5

8 - 4

PA UNIT. ...................................................................................................................................................... 8 - 7

8 - 5

PLL UNIT. .................................................................................................................................................... 8 - 9

8 - 6

FILTER BOARD. ........................................................................................................................................ 8 - 11

SECTION 9

BLOCK DIAGRAM

SECTION 10

VOLTAGE DIAGRAM

SECTION 1

SPECIFICATIONS

GENERAL

• Frequency coverage

RECEIVER

• Receive system

Receive

0.030 – 200.000 MHz*

430.000 – 470.000 MHz*

SSB/CW/AM/WFM

Double superheterodyne

Triple superheterodyne

Transmit

1.800 – 1.999 MHz*

3.500 – 3.999 MHz*

7.000 – 7.300 MHz*

10.100 – 10.150 MHz

14.000 – 14.350 MHz

18.068 – 18.168 MHz

21.000 – 21.450 MHz

24.890 – 24.990 MHz

28.000 – 29.700 MHz

50.000 – 54.000 MHz*

144.000 – 148.000 MHz*

430.000 – 450.000 MHz*

• Intermediate frequencies

MODE

SSB/AM-N/FM

AM/FM-N

RTTY

WFM

1st IF

69.0115 MHz

69.0100 MHz

69.0106 MHz

69.0105 MHz

70.7000 MHz

2nd IF

9.0115 MHz

9.0100 MHz

9.0106 MHz

9.0105 MHz

10.7000 MHz

3rd IF

455 kHz*

—

*FM or FM-N mode only

• Receive sensitivity

(pre-amp ON)

*Depending on version.

• Mode : USB, LSB, CW, RTTY (FSK), AM, FM,

WFM (WFM is for receiver only)

• Number of memory ch. : 107 (99 regular, 6 scan edges,1 call)

• Antenna connector : SO-239 5 2

(for HF/50 MHz and 144/440 MHz)/50 ½

• Power supply requirement : 13.8 V DC ±15% (negative ground)

• Frequency stability

FREQUENCY

0.5 – 1.8 MHz

1.8 – 28 MHz*

28 – 29.999 MHz

50 MHz band

144 MHz band

440 MHz band

SSB/CW/RTTY

—

0.16 µV

0.13 µV

0.11 µV

13 µV

2 µV

1 µV

—

0.5 µV

0.25 µV

0.18 µV

: Less than ± 7 ppm from 1 min. to 60

min. after power ON. After that, rate of

stability less than ±1 ppm/hr. at +25˚C

(+77˚F). Temperature fluctuations 0˚C

to +50˚C (+32˚F to +122˚F) less than

± 5 ppm.

Note: SSB, CW and AM modes are measured at 10 dB S/N; FM mode at

12 dB SINAD.

*Except 4–4.5 MHz, 8–9 MHz.

• Squelch Sensitivity

: (pre-amp ON)

SSB

Less than 5.6 µV

Less than 0.32 µV

• Current consumption :

Transmit max. power 20 A

Receive standby 1.8 A

max. audio 2.0 A

• Usable temperature range : –10˚C to +60˚C (+14˚F to +140˚F)

• Dimensions

• Selectivity* :

SSB, CW, RTTY More than 2.4 kHz/–6 dB

Less than 4.8 kHz/–60 dB

AM/FM-N More than 8.0 kHz/–6 dB

Less than 30 kHz/–40 dB

FM More than 12 kHz/–6 dB

Less than 30 kHz/–60 dB

*Without an optional filter unit and with mid bandwidth selected.

• Spurious and image rejection ratio:

HF band

: 167(W) 5 58(H) 5 200(D) mm

6 9 ⁄ 16 (W) 5 2 9 ⁄ 32 (H) 5 7 7 ⁄ 8 (D) inch

(projections not included)

• Weight

: 2.45 kg (5 lb 6 oz)

: 2-conductor 3.5 (d) mm ( 1 / 8 ")/8

• CI-V connector

• ACC connector

: 13-pin

70dB

50 MHz band

65 dB (except IF through)

144/440 MHz band

65 dB

TRANSMITTER

• Output power

• Audio output power

: More than 2.0 W at 10% distortion

(at 13.8 V DC)

with an 8 ½

load

1.8–50 MHz band

SSB/CW/RTTY/FM 5–100 W

• RIT variable range

: ± 9.99 kHz

2–40 W

: 3-conductor 3.5 (d) mm ( 1 / 8 ")/8 ½

• PHONES connector

144 MHz band

SSB/CW/RTTY/FM 5–50 W

: 2-conductor 3.5 (d) mm ( 1 / 8 ")/8 ½

2–20 W

• EXT SP connector

440 MHz band

SSB/CW/RTTY/FM 2–20 W

2–8 W

• Modulation system

SSB

Balanced modulation

Low level modulation

Variable reactance modulation

• Spurious emissions :

Below 47.5 MHz Less than –50 dB (typical)

Above 47.5 MHz Less than –60 dB

• Carrier suppression : More than 40 dB

• Unwanted sideband supp. : More than 50 dB

• Microphone connector

: 8-pin modular jack (600

)

: 3-conductor 6.35 (d) mm ( 1 / 4 ")

• KEY connector

: 3-conductor 3.5 (d) mm ( 1 / 8 ")

• RTTY connector

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

1 - 1

SECTION 2

INSIDE VIEWS

Á MAIN AND FILTER BOARDS

FILTER board

D/A converter

(IC2201: M62352GP)

RX preamplifier

(IC151:

MAIN CPU clock

(X2161: CR-636)

MAIN CPU *

(IC 2001: HD6433337YA56F)

PC1658G)

HPF board

1st mixer

(D271: HSB88WSTR)

MAIN board

3rd IF filter for FM *

(FI791: SFPC455E-TC01)

MIC amplifier

(IC931: µ PC5023GS-077-E1)

1st IF filter

(FI511: FI-261)

2nd mixer *

(D551: HSB88WSTR)

2nd IF filter

(FI561: FL-23)

Space for optional filters

AF selector switch *

(IC861: BU4052BCFV-E2)

Discriminator

(X791: CDB455CX24)

ç ÷

FL-100, FL-101, FL-103

FL-233, FL-232

Balanced modulator *

(IC1041: NJM1496V)

FM IF IC *

(IC791: TA31136FN)

Tx FM PLL IC *

(IC1011: LC7153M-TLM)

Á PA AND PLL UNITS

Power amplifers

(Q171, Q172, Q231: SRFJ7044)

PA unit

DRIVER board

DDS IC

(IC101: SC-1246)

Drive amplifers

(Q161, Q211: MRF1508TI)

Predrive amplifier

(Q101: 2SK2854)

BFO DDS IC

(IC901: SC-1287)

Predrive amplifer

(Q121: MXR9745)

AF power amplifer

(IC231: LA4425A)

PLL IC *

(IC461: LMX2306TMX)

PLL unit

AF volume controller

(IC201: M5282FP)

VCO3 *

(Q361: 2SK508)

VCO1 *

(Q301: 2SK508)

Reference oscillator

(X621: CR-275A 30.00000 MHz)

VCO2 *

(Q331: 2SK508)

*Located under side of the point

2 - 1

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