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1、HF/ 50MHz ALL MODE TRANSCEIVER i703 SERVICE MANUAL INTRODUCTION This service manual describes the latest service information for the IC-703 HF/50MHz ALL MODE TRANSCEIVER. 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 transce

2、iver. DO NOT expose the transceiver to rain, snow or any liquids. 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 su

3、re to include the following four points when ordering replacement parts: 1. 10-digit order numbers 2. Component part number and name 3. Equipment model name and unit name 4. Quantity required 1110004080 S.ICPC2709TIC-703 MAIN UNIT5 pieces 8810009610 Screw FH M2.66 ZKIC-703 Top cover10 pieces Address

4、es are provided on the inside back cover for 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 sl

5、owly and smoothly. 4. DO NOT short any circuits 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

6、 dB to 60 dB attenuator between the transceiver 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 circu

7、its are subject to change without notice or obligation. SYMBOL EUR-1 FRA-1 ESP-1 USA-1 KOR-1 OTH-1 ITR-1 UT-106 equippedUT-106 option FRA ESP USA KOR OTH ITR EUREurope France Spain U.S.A. Korea Other Italy VERSIONMODEL IC-703 TABLE OF CONTENTS SECTION 1SPECIFICATIONS SECTION 2INSIDE VIEWS SECTION 3C

8、IRCUIT DESCRIPTION 3 - 1RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1 3 - 2TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9、 . . .3 - 4 3 - 3PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 7 3 - 4ANTENNA TUNER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10、 .3 - 7 3 - 5POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 9 3 - 6CPU PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 9 SECTION

11、 4ADJUSTMENT PROCEDURES 4 - 1PREPARATION BEFORE SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1 4 - 2PLL ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12、.4 - 2 4 - 3TRANSMITTER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 4 4 - 4RECEIVER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 8 4 - 5SET MOD

13、E ADJUSTMENTS (No.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 10 4 - 6PA UNIT ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 12 4 - 7SET MODE ADJUSTMENTS (No.

14、2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 14 SECTION 5PARTS LIST SECTION 6MECHANICAL PARTS SECTION 7SEMI-CONDUCTOR INFORMATION SECTION 8BOARD LAYOUTS 8 - 1DISPLAY BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1 8 - 2JACK BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1 8 - 3VR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 2 8 - 4MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 3 8 - 5PA UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . .

17、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 5 SECTION 9BLOCK DIAGRAM SECTION 10WIRING DIAGRAM SECTION 11VOLTAGE DIAGRAMS 11 - 1 FRONT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18、 . . . . . . . . .11 - 1 11 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 2 11 - 3 PA UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19、 . . . . . . . . . . . . . . . . . . .11 - 7 1 - 1 SECTION 1SPECIFICATIONS I GENERAL Frequency coverage: Receive0.030 60.000 MHz* Transmit1.800 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.

20、000 54.000 MHz* *Depending on version. Mode : USB, LSB, CW, RTTY (FSK), AM, FM Number of memory ch.: 105 (99 regular, 6 scan edges) Antenna connector: SO-239/50 (at antenna tuner off) Power supply requirement : 13.8 V DC 15% (negative ground) Frequency stability: Temp. fluctuations 0C to +50C (+32F

21、to +122F) Less than 0.5 ppm. Temp. fluctuations 10C to +60C (+14F to +140F) Less than 2.5 ppm. Frequency resolution: General10 kHz shift Automatic50 kHz shifit FineLess than 2 Hz shift Current consumption: Transmit10 W: 3.0 A (at 13.8 V DC) 5 W: 2.0 A (at 9.6 V DC) ReceiveStandby: 300 mA (at 9.6 V D

22、C) AF output : 450 mA (at 9.6 V DC)* 1 AF output : 1.2 A (at 13.8 V DC)* 1 * 1with 10 % distortion Usable temperature range : 10C to +60C (+14F to +140F) Dimensions: 167(W) 58(H) 200(D) mm (projections not included)6916(W) 2932(H) 778(D) inch Weight: 2.0 kg (4 lb 7 oz) CI-V connector: 2-conductor 3.

23、5 (d) mm (1/8)/8 ACC connector: 13-pin I TRANSMITTER Output power: 1.850 MHz bandSSB/CW/RTTY/FM 0.110 W* 1 0.15 W* 2 AM0.14 W* 1 0.12 W* 2 * 1at 13.8 V DC power supply, *2at 9.6 V DC power supply Modulation system: SSBBalanced modulation AMLow level modulation FMVariable reactance modulation Spuriou

24、s emissions: Below 30 MHzLess than 50 dB Above 30 MHzLess than 60 dB Carrier suppression: More than 40 dB Unwanted sideband supp. : More than 50 dB Microphone connector: 8-pin modular jack (600 ) KEY connector: 3-conductor 6.35 (d) mm (1/4) RTTY connector: 3-conductor 3.5 (d) mm (1/8) I RECEIVER Rec

25、eive system: Double superheterodyne Intermediate frequencies: 1st IF; 64.455 kHz, 2nd IF; 455 kHz Receive sensitivity :(Pre-amp. is ON.) Note: SSB, CW and AM modes are measured at 10 dB S/N. FM mode are measured at 12 dB SINAD. * 1Except 44.5 MHz, 89 MHz. *2Pre-amp. is OFF. Squelch Sensitivity : (Pr

26、e-amp. is ON.) AM, SSB, CW, RTTY Less than 5.6 V FMLess than 0.32 V Selectivity* (Typical): SSB, CW, RTTYMore than 2.4 kHz/6 dB Less than 4.0 kHz/60 dB AM, FM-NMore than 9.0 kHz/6 dB Less than 20 kHz/50 dB FMMore than 15 kHz/6 dB Less than 30 kHz/50 dB *Without an optional filter unit and with mid b

27、andwidth selected. Spurious and image rejection ratio: HF bandMore than 70 dB 50 MHz bandMore than 65 dB (except IF through) Audio output power : More than 1.0 W at 10% distortion with an 8 load, 13.8 V DC More than 5.0 W at 10% distortion with an 8 load, 9.6 V DC RIT variable range: 9.99 kHz PHONES

28、 connector: 3-conductor 3.5 (d) mm (1/8)/8 EXT SP connector: 2-conductor 3.5 (d) mm (1/8)/8 FM 0.5 V 0.25 V FREQUENCY 0.5 1.8 MHz 1.8 28 MHz* 1 28 29.999 MHz 50 MHz band SSB/CW/RTTY 0.16 V 0.16 V 0.13 V AM 13 V* 2 2 V 2 V 1 V All stated specifications are subject to change without notice or obligati

29、on. 2 - 1 SECTION 2INSIDE VIEWS DISPLAY BOARD Sub CPUSub CPU (IC6: HD6473847RH) +5V regulator Main dial Reset IC (IC6: HD6473847RH) +5V regulator Main dial Reset IC (IC4: S-80945CLMC-G7F) SW LED dimmer (IC4: S-80945CLMC-G7F) SW LED dimmer Q50: 2SB1132 Q50: 2SB1132 Q51: 2SC4081 LCD driver Q51: 2SC408

30、1 LCD driver (IC2: SED1522F0C) VR board Back light dimmer (IC2: SED1522F0C) VR board Back light dimmer Q2: 2SB1132 Q2: 2SB1132 Q3: 2SC4081 Q3: 2SC4081 Key dimmerKey dimmer Q13: 2SB1132 Q13: 2SB1132 Q14: 2SC4081 Q14: 2SC4081 Sub CPU (IC6: HD6433842RB27H) +5V regulator Main dial Reset IC (IC4: S-80945

31、CLMC-G7F) SW LED dimmer Q50: 2SB1132 Q51: 2SC4081 LCD driver (IC2: SED1522F0C) VR board Back light dimmer Q2: 2SB1132 Q3: 2SC4081 Key dimmer Q13: 2SB1132 Q14: 2SC4081 PA UNIT Expand ICExpand IC (IC600: ISPLSI2064VE) Buffer (IC600: ISPLSI2064VE) Buffer (IC560: NJM2904M)(IC560: NJM2904M) ComparatorCom

32、parator (IC640: TA75393)(IC640: TA75393) Low-pass filterLow-pass filter TX/ RX switchTX/ RX switch (RL250: ATN207)(RL250: ATN207) Drive amplifierDrive amplifier (Q150: RD01MUS1)(Q150: RD01MUS1) Pre drive amplifierPre drive amplifier (Q101: 2SK3074)(Q101: 2SK3074) Power amplifierPower amplifier (Q200

33、, Q201:(Q200, Q201: RD07MVS1) RD07MVS1) Expand IC (IC600: ISPLSI2064VE) Buffer (IC560: NJM2904M) Comparator (IC640: TA75393) Low-pass filter TX/ RX switch (RL250: ATN207) Drive amplifier (Q150: RD01MUS1) Pre drive amplifier (Q101: 2SK3074) Power amplifier (Q200, Q201: RD07MVS1) MAIN UNIT YGR amplifi

34、erYGR amplifier (IC101: PC2709T) 1st mixer (IC101: PC2709T) 1st mixer (D701: HSB88WS) 1st IF amplifier (D701: HSB88WS) 1st IF amplifier (Q811: 2SK508) 1st IF filter (Q811: 2SK508) 1st IF filter (FI851: FL-348) 2nd mixer (FI851: FL-348) 2nd mixer (D901: HSB88WS) 2nd IF filter (D901: HSB88WS) 2nd IF f

35、ilter (FI1501: CFWS455E) 2nd IF amplifier (FI1501: CFWS455E) 2nd IF amplifier (Q1401: 3SK294) Noise blancer circuit VCO circuit PLL IC (Q1401: 3SK294) Noise blancer circuit VCO circuit PLL IC (IC9101: MC145170D2R2) PLL IC (IC9101: MC145170D2R2) PLL IC (IC9601: LC7153M) A/D converter (IC9601: LC7153M

36、) A/D converter (IC5601: BU4052BCF) AF power amplifier (IC5601: BU4052BCF) AF power amplifier (IC7301: TDA7233D) UT-106 Main CPU (IC7301: TDA7233D) UT-106 Main CPU (IC5901: M30620FCMGP) Reset IC (IC5901: M30620FCMGP) Reset IC (IC5981: R3112N281A) DDS IC (IC5981: R3112N281A) DDS IC (IC9001: AD9833BRM

37、) D/A converter (IC9001: AD9833BRM) D/A converter (IC6501: M62364FP) Balanced modulator (IC6501: M62364FP) Balanced modulator (IC1801: TA4107F) Automatic gain (IC1801: TA4107F) Automatic gain control circuitcontrol circuit YGR amplifier (IC101: PC2709T) 1st mixer (D701: HSB88WS) 1st IF amplifier (Q8

38、11: 2SK508) 1st IF filter (FI851: FL-348) 2nd mixer (D901: HSB88WS) 2nd IF filter (FI1501: CFWS455E) 2nd IF amplifier (Q1401: 3SK294) Noise blancer circuit VCO circuit PLL IC * (IC9101: MC145170D2R2) PLL IC * (IC9601: LC7153M) A/D converter * (IC5601: BU4052BCF) AF power amplifier * (IC7301: TDA7233

39、D) UT-106 Main CPU (IC5901: M30620MCM-1W4GP) Reset IC (IC5981: R3112N281A) * Located under side of the point DDS IC (IC9001: AD9833BRM) D/A converter (IC6501: M62364FP) Balanced modulator (IC1801: TA4107F) Automatic gain control circuit 2 - 2 3 - 1 3-1 RECEIVER CIRCUITS 3-1-1 RF CIRCUIT (PA AND MAIN

40、 UNITS) HF/50 MHz RF filters pass only the desired band signals and suppress any undesired band signals. The HF/50 MHz RF circuit has 7 low-pass filters and 6 high-pass filters for specified band use. HF/50 MHz RF signals from the ANT connector, pass through one of 7 low-pass filters as below, the t

41、ransmit/ receive switching relay (PA unit; RL250) and low-pass filter (PA unit; L300, L301, C304C308), and are then applied to the MAIN unit via J300 (PA unit). The signals from the PA unit are applied to or bypass the 20 dB attenuator (MAIN unit; R2, R3). The signals pass through the high-pass filt

42、er (MAIN unit; L301L303, C301C303) to suppress strong signals above 1.6 MHz and are then applied to the HPF section. (1) 0.032 MHz and 3040 MHz The signals pass through a low-pass filter (L304, L305, C306C310), and then applied to the preamplifier circuit on the MAIN unit. (2) 230 MHz The signals fr

43、om the low-pass filter (L304, L305, C306C310) are applied to one of 5 high-pass filters as at right above and are then applied to the preamplifier circuit on the MAIN unit. (3) 4060 MHz The signals pass through the high-pass filter (L502L504, C501C505) and the low-pass filter (L501, L506L508 C506C51

44、3), and are then applied to the preamplifier circuit on the MAIN unit. 3-1-2 PREAMPLIFIER CIRCUIT (MAIN UNIT) The preamplifier circuit in the IC-703 has approx. 15dB gain over a wide-band frequency range. When the preamplifier is turned ON, the signals from the RF circuit are applied to the preampli

45、fier (Q651) via D622 or D632. Amplified or bypassed (passes through the D601 and D602 when bypassed) signals are applied to the 1st mixer circuit (D701). 3-1-3 1ST MIXER CIRCUIT (MAIN UNIT) The 1st mixer circuit mixes the receive signals with the 1st LO signal to convert the receive signal frequenci

46、es to a 64.455 MHz 1st IF signal. The signals from the preamplifier circuit, or signals which bypass the preamplifier, are passed through a low-pass fil- ter (L681L683, C681C687) and then applied to the 1st mixer (D701). The 1st LO signal (one of the 64.485124.455 MHz) is amplified at Q751, filtered

47、 by a low-pass filter (L753, C756C759), passed through the attenuator (R771R773), and then applied to the 1st mixer. 3-1-4 1ST IF CIRCUIT (MAIN UNIT) The 1st IF circuit filters and amplifies the 1st IF signals. The 1st IF signals are applied to a Crystal Filter (FI851) to sup- press out-of-band sign

48、als. The 64.445 MHz 1st IF signals pass through the crystal fil- ter (FI851). Then the filtered signals are applied to the IF amplifier (Q881). The AGC voltage is supplied to the Q881s gate to obtain stable signal for AGC operation. Used RF high-pass filter (MAIN unit) Used RF low-pass filter (MAIN

49、unit) SECTION 3CIRCUIT DESCRIPTION Frequency (MHz) 0.032 MHz 24 MHz 48 MHz 815 MHz Frequency (MHz) 1522 MHz 2230 MHz 3060 MHz Control signal F5 F6 F7 Control signal F1 F2 F3 F4 Entrance coil RL401 RL421 RL441 RL461 Entrance coil RL481 RL501 RL521 Frequency (MHz) 0.032 MHz 24 MHz 48 MHz 815 MHz Frequency (MHz) 1522 MHz 2230 MHz 3040 MHz 4060 MHz Control signal B5H B6H BTHH B7RH Control signal BTHH B2H B3H B4H Entrance coil D541 D551 D561 D571 Entrance coil D581 D591 D541 D501 1st LO: 69.0415 MHz 530.0115 MHz LPFsHPFs 1st mi