IC756PROIII.pdf

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1、GUIDE FOR CD 1) COMPOSITION 756PRO3.pdf A3format.pdf A4format.pdf Instruction.pdf Unitparts.pdf ar505eng.exe W_README.txt 2) DESCRIPTION 756PRO3.pdf 756PRO3.pdf is a service manual for IC-756PROIII and including all service information in this CD. This file is mainly used for viewing on the computer

2、 display and checking page order to make printed service manual. Or when you want to find a component, you can find very fast using “FIND” function (except Board layout). A3format.pdf A3format.pdf consists of A3 format pages (Board layout, Mechanical parts and disassembly, and etc.) in 756PRO3.pdf.

3、This file is used for printing out A3 format pages. A4format.pdf A4format.pdf consists of A4 format pages (Circuit description, Adjustment procedures, Parts list, and etc.) in 756PRO3.pdf. This file is used for printing out A4 format pages. Instruction.pdf Instruction.pdf is a instruction manual for

4、 IC-756PROIII. This file is exactly same as supplying instruction manual withproduct and consists of all A4 format pages. If you have A4 format printer, you can print out and make brand new instruction manual any time you want. Also this fi le is very helpful when you want to change or set product c

5、onditionfor adjustment or else. Unitparts.pdf Unitparts.pdf is assemble unit information for IC-756PROIII. This information for authorized dis-tributor/dealer only. Because we (ICOM INC.) dont sell assemble unit to general. ar505eng.exe ar505eng.exe is an installation program of Adobe Acrobat Reader

6、 5.0 (English version) for Microsoft Windows 95/98/Me/NT/2000/XP users. FYC Installer IC_756PRO3 1 W_README.txt W_README.txt is a readme text about this service manual for Windows user that not installed Acrobat Reader yet. = Icom, Icom Inc. and Icom logo are registered trademarks of Icom Incorporat

7、ed (Japan) in the United states, the United Kingdom, Germany, France, Spain, Russia and/or other countries. Acrobat Reader Copyright 1987-2002 Adobe Systems Incorporated. All rights reserved. Adobe, the Adobe logo, Acrobat, and the Acrobat logo are trademarks of Adobe Systems Incorporated. Microsoft

8、 and Windows are registered trademarks of Microsoft Corporation in the U.S.A. and other countries. Copyright 2004 Icom Inc. = 2 HF/50MHz ALL MODE TRANSCEIVER SERVICE MANUAL U.S.A. Europe France United Kingdom Italy Korea Spain #32 #33 #34 #35 #38 #39 #40 USA EUR FRA UK ITA KOR ESP INTRODUCTION This

9、service manual describes the latest service information for the IC-756PROIII HF/50MHz ALL MODE TRANSCEIV- ER. DANGER 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 liqu

10、ids. 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 transceiv- ers front end. ORDERING PARTS Be sure to include the following four points when ordering replace

11、ment parts: 1. 10-digit order numbers 2. Component part number and name 3. Equipment model name and unit name 4. Quantity required 1110000960 S.ICNJM4558MIC-756PROIII MAIN-A UNIT 5 pieces 8810005770 Screw BiH M38 ZK IC-756PROIII Top cover10 pieces Addresses are provided on the inside back cover for

12、your convenience. REPAIR NOTES 1. Make sure a 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 circui

13、ts or electronic parts. An insu- lated tuning tool MUST be used for all adjustments. 5. DO NOT keep power ON for a long time when the trans- ceiver is defective. 6. DO NOT transmit power into a signal generator or a sweep generator. 7. ALWAYS connect a 50 dB to 60 dB attenuator between the transceiv

14、er and a deviation meter or spectrum ana- lyzer when using such test equipment. 8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or o

15、bligation. Icom, Icom Inc. and are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries. VER.NO.SYMBOLVERSION TABLE OF CONTENTS SECTION 1SPECIFICATIONS SECTION 2INSIDE VIEWS SECTION 3CIRCUIT DESCRIPTION SEC

16、TION 4ADJUSTMENT PROCEDURES SECTION 5PARTS LIST SECTION 6MECHANICAL PARTS AND DISASSEMBLY SECTION 7SEMI-CONDUCTOR INFORMATION SECTION 8BOARD LAYOUTS 8 - 1DISPLAY BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1

17、 8 - 2MODE BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 3 8 - 3PHONE BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18、8 - 3 8 - 4KEY BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 3 8 - 5TEN-KEY BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19、 . .8 - 3 8 - 6PBT BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 5 8 - 7RIT BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20、 . . . . . . . .8 - 5 8 - 8MIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 5 8 - 9MEMORY BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

21、. . . . . . . . . . .8 - 5 8 - 10 MAIN-A UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 7 8 - 11 DSP-A BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22、. . . . . . . . . . . . . . . . . .8 - 9 8 - 12 RF-B UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 11 8 - 13 BPF-A BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

23、 . . . . . . . . . . . . . . . . . . . . . . . .8 - 13 8 - 14 PREAMP BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 13 8 - 15 PLL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 15 8 - 16 PA UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 17 8 - 17 FILTER-A UNIT . . . . . . . . . . . . . . . . . . . . . . . . . .

25、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 19 8 - 18 CTRL-A UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 21 8 - 19 TUNER-A BOARD . . . . . . . . . . . . . . . . . . .

26、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 23 SECTION 9BLOCK DIAGRAM SECTION 10VOLTAGE DIAGRAMS 10 - 1 FRONT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1 1

27、0 - 2 DSP-A BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 3 10 - 3 TUNER-A, MEMORY BOARDS AND CTRL-A UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 5 10 - 4 MAIN-A UNIT .

28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 7 10 - 5 PLL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 12 10 - 6

29、 PA AND FILTER-A UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 15 10 - 7 BPF-A, PREAMP BOARDS AND RF-B UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 17 SECTION 1 SPECIFICATIONS 1

30、- 1 GENERAL Frequency coverage: Receive 0.03060.000 MHz*1, *2 Transmit 1.8001.999 MHz*2 3.5003.999 MHz*2 5.3305, 5.3465, 5.3665, 5.3715, 5.4035 MHz*3 7.0007.300 MHz*2 10.10010.150 MHz*2 14.00014.350 MHz*2 18.06818.168 MHz*2 21.00021.450 MHz*2 24.89024.990 MHz*2 28.00029.700 MHz*2 50.00054.000 MHz*2

31、*1 Some frequency bands are not guaranteed. *2 Depending on version. *3 USA only. Mode : USB, LSB, CW, RTTY, AM, FM Number of memory channels : 101 (99 regular, 2 scan edges) Antenna connector : SO-239 2 (50 ) phono jack (RCA; 50 ) Usable temp. range : 10C to +50C (14F to 122F) Frequency stability :

32、 Less than 0.5 ppm from 1 min. after power ON. (10C to +50C; 14F to 122F) Freq. resolution : 1 Hz Power supply requirement: 13.8 V DC 15% (negative ground) Current drain : Transmit max. power 23 A Receive stand-by 3.0 A (typical) max. audio 3.3 A (typical) Dimensions : 340(W)111(H)285(D) mm (proj. n

33、ot included) ; 338(W)438(H)11732(D) in Weight (approx.) : 9.6 kg (21 lb 3 oz) ACC 1 connector : 8-pin DIN connector ACC 2 connector : 7-pin DIN connector CI-V connector : 2-conductor 3.5(d) mm (18) Display : 5-inch (diagonal) TFT color LCD TRANSMITTER Output power : SSB/CW/RTTY/FM 5100 W AM 540 W Mo

34、dulation system : SSB PSN modulation AM Low power modulation FM Phase modulation Spurious emission : Less than 50 dB (HF bands) Less than 60 dB (50 MHz band) Carrier suppression : More than 40 dB Unwanted sideband suppression: More than 55 dB TX variable range : 9.999 kHz Mic. connector : 8-pin conn

35、ector (600 ) ELE-KEY connector: 3-conductor 6.35(d) mm (14) KEY connector : 3-conductor 6.35(d) mm (14) SEND connector : Phono jack (RCA) ALC connector : Phono jack (RCA) RECEIVER Receive system : Triple-conversion superheterodyne system Intermediate frequencies: 1st IF 64.455 MHz 2nd IF 455 kHz 3rd

36、 IF 36 kHz Sensitivity : SSB, CW, RTTY (at 2.4 kHz bandwidth) 1.829.99 MHz*1 0.16 V (10 dB S/N) 50.054.0 MHz*2 0.13 V (10 dB S/N) AM (at 6.0 kHz bandwidth) 0.51.799 MHz 13 V (10 dB S/N) 1.829.99 MHz*1 2.0 V (10 dB S/N) 50.054.0 MHz*2 1.0 V (10 dB S/N) FM (at 15 kHz bandwidth) 28.029.99 MHz*1 0.5 V (

37、12 dB SINAD) 50.054.0 MHz*2 0.32 V (12 dB SINAD) *1 Pre-amp 1 ON *2 Pre-amp 2 ON Squelch sensitivity : (Pre-amp OFF) SSB/CW/RTTY Less than 5.6 V FM Less than 1.0 V Selectivity : SSB/RTTY (at 2.4 kHz bandwidth) More than 2.4 kHz/6 dB Less than 3.6 kHz/60 dB CW (at 500 Hz bandwidth) More than 500 Hz/6

38、 dB Less than 700 Hz/60 dB AM (at 6 kHz bandwidth) More than 6.0 kHz/6 dB Less than 15.0 kHz/60 dB FM (at 15 kHz bandwidth) More than 12 kHz/6 dB Less than 20 kHz/60 dB Spurious and image rejection ratio: More than 70 dB (except IF through in 50 MHz band) RIT variable range : 9.999 kHz Audio output

39、power : More than 2.0 W at 10% distortion (at 13.8 V DC) with an 8 load PHONES connector: 3-conductor 6.35(d) mm (14) EXT SP connector : 2-conductor 3.5(d) mm (18) 8 ANTENNA TUNER Matching impedance range: HF bands 16.7 to 150 unbalanced*1 50 MHz band 20 to 125 unbalanced*2 *1 Less than VSWR 3:1 *2

40、Less than VSWR 2.5:1 Minimum operating input power: 8 W Tuning accuracy : VSWR 1.5:1 or less Insertion loss : Less than 1.0 dB (after tuning) All stated specifications are subject to change without notice or obligation. SECTION 2INSIDE VIEWS 2 - 1 TOP VIEW Fan control circuit PA unit Fan FILTER-A un

41、it TUNER-A unit Antenna tuner CPU (IC5: M38022M2-138FP) Drive amplifier Voltage regulator Common filter (L501: LR-386) Common filter (L502: LR-386) CTRL-A unit Current transformer (L1: LR-364) C-MOS IC (IC14: TC74AC04F) Fan control circuit PA unit Fan FILTER-A unit TUNER-A unit Antenna tuner CPU (IC

42、5: M38022M2-138FP) Drive amplifier Voltage regulator Common filter (L501: LR-386) Common filter (L502: LR-386) CTRL-A unit Current transformer (L1: LR-364) C-MOS IC (IC14: TC74AC04F) Fan control circuit Q10, Q11: 2SC40812 Q12, Q13: 2SB12012 PA unit Cooling fan FILTER-A unit TUNER-A unit Antenna tune

43、r CPU (IC5: M38022M2-138FP) Drive amplifier circuit (Q2, Q3: 2SC19722) Voltage regulator IC1: TA7805F IC2: TA7805S IC3: TA78T08C Common filter (L501: LR-386) Common filter (L502: LR-386) CTRL-A unit Current transformer (L1: LR-364) C-MOS IC (IC14: TC74AC04F) Power amplifier (Q4, Q5: 2SC51252) Power

44、amplifier (Q4, Q5: 2SC51252) Power amplifiers (Q4, Q5: 2SC51252) 2 - 2 BOTTOM VIEW Reference frequency oscillator (X52: CR-338 32.00056MHz) RF-B unit BPF-A board PLL unit 1LO PLL IC (IC381, IC681: LMX2306TM) VCO-B circuit VCO-A circuit S2LO PLL IC (IC901: LC7153M) 1LO DDS IC (IC101, IC401: SC-1246A)

45、 3LO/S3LO DDS IC (IC701, IC801: SC-1287) MAIN-A unit Noise blanker circuit LCD contorller (IC3551: S1D13504F00A000) MAIN CPU (IC3501: HD64F2375F20) TX 3rd mixer (IC221: NJM1496V) RX 3rd mixer (IC151: TC4W53FU) DSP-A board PREAMP board TX 1st mixer (D1451: HSB88WS) FM IF IC (IC2001: TA3116FN) RX 1st

46、mixer circuit RX 2nd mixer (D1752: HSB88WS) TX 2nd mixer (D1852: HSB88WS) Reference frequency oscillator (X52: CR-338 32.00056MHz) RF-B unit BPF-A board PLL unit 1LO PLL IC (IC381, IC681: LMX2306TM) VCO-B circuit VCO-A circuit S2LO PLL IC (IC901: LC7153M) 1LO DDS IC (IC101, IC401: SC-1246A) 3LO/S3LO

47、 DDS IC (IC701, IC801: SC-1287) MAIN-A unit Noise blanker circuit LCD contorller (IC3551: S1D13504F00A000) MAIN CPU (IC3501: HD64F2375F20) TX 3rd mixer (IC221: NJM1496V) RX 3rd mixer (IC151: TC4W53FU) DSP-A board PREAMP board TX 1st mixer (D1451: HSB88WS) FM IF IC (IC2001: TA3116FN) RX 1st mixer cir

48、cuit RX 2nd mixer (D1752: HSB88WS) TX 2nd mixer (D1852: HSB88WS) Reference frequency oscillator (X52: CR-338. 32.00056MHz) RF-B unit BPF-A board PLL unit 1LO PLL IC (IC381, IC681: LMX2306TM) VCO-B circuit VCO-A circuit S2LO PLL IC (IC901: LC7153M) 1LO DDS IC (IC101, IC401: SC-1246A) 3LO/S3LO DDS IC (IC701, IC801: SC-1287) MAIN-A unit Noise blanker circuit LCD contorller (IC3551: S1D13504F00A000) MAIN CPU (IC3501: HD64F2375F20) TX 3rd mixer (IC221: NJM1496V) RX 3rd mixer (IC151: TC4W53FU) DSP-A board PREAMP