Icom IC-730 Maintenance Manual
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Icom IC-730 Maintenance Manual

Icom IC-730 Maintenance Manual

Hf all band transceiver
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HF ALL BAND TRANSCEIVER
MAINTENANCE MANUAL
ICOM INCORPORATED
1-6-19, Kamikurazukuri Hirano-ku,Osaka, Japan
Phone: [06] 793-5301
Telex: ICOM TR J63649
ICOM EUROPE
Himmelgeister Strass 100
4000 Duesseldorf 1
West Germany
Phone: 0211-346047
Telex: 41-8588082
ICOM AMERICA, INC
2112 116th Avenue N.E.
Bellevue, WA 98004
Phone: [206] 454-8155
Telex: 230-152210 ICOM AMER BVUE
3331 Towerwood Dr., Suite 307
Dallas, Texas 75234
Phone: [214] 620-2781
ICOM CANADA
810 S.W. Marine Drive
Vancouver, BC Canada
Phone: [604] 321-1833
Telex: 21-454315
ICOM AUSTRALIA, PTY, Ltd.
7 Duke Street, Windsor 3181
Victoria, Australia
Phone: [03] 529-7582
Telex: 71-35521 ICOMAS AA35521

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  • Page 1 7 Duke Street, Windsor 3181 2112 116th Avenue N.E. Victoria, Australia Bellevue, WA 98004 Phone: [03] 529-7582 Phone: [206] 454-8155 Telex: 71-35521 ICOMAS AA35521 Telex: 230-152210 ICOM AMER BVUE 3331 Towerwood Dr., Suite 307 Dallas, Texas 75234 Phone: [214] 620-2781...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SECTION 1. SPECIFICATIONS ............1-1 SECTION 2.

  • Page 3: Section 1 Specifications

    SECTION 1 SPECIFICATIONS GENERAL Harmonic Output: Number of Semi-Conductors: More than 50dB below peak power output Transistors Spurious Output: More than 50dB below peak power output IC (Includes CPU) Carrier Suppression: Diodes More than 50dB below peak power output Frequency Coverage: Unwanted Sideband: More than 55dB down at 1000Hz AF input 3.5MHz ~ 4.0 MHz...

  • Page 4: Section 2 Operating Controls

    SECTION 2 OPERATING CONTROLS 2 – 1 FRONT PANEL 2 – 2 CONTROLS UNDER THE ACCESS COVER 2 – 3 REAR PANEL CONNECTIONS 2 – 1...
  • Page 5 Set the switch to RECEIVE (out) and the IC-730 is in the receive mode. Set the switch to Upper Sideband, mainly for 10, 14, 18, 21, 24 and TRANSMIT (in) and it switches to transmit. When switching with 28MHz bands.
  • Page 6 FREOUENCY DISPLAY illuminated. Rotating the control to the (+) side raises the The frequency of the IC-730 is displayed on a luminescent receive frequency, and rotating to the (-) side lowers the display tube. Since the 1MHz and 1KHz decimal points are receive frequency.
  • Page 7 VHF and UHF operation using a suitable transverter with in mobile installations. the IC-730 is possible. This terminal is for Transverter connection. The output is a few milliwatts. POWER SOCKET...

  • Page 8: Section 3 Circuit Description

    SECTION 3 CIRCUIT DESCRIPTION 3 – 1 RECEIVING CIRCUITS 21.0 60.6315MHz ~ 61.3315MHz 3 – 1 – 1 RF CIRCUITS 24.0 64.1315MHz ~ 64.8315MHz The receiving signal from the antenna is fed from P3 of the 28.0 67.6315MHz ~ 68.3315MHz LPF unit to J2-1, where frequencies less than 3.5MHz are 28.5 68.1315MHz ~ 68.8315MHz...
  • Page 9 shunts the RF signals to ground. This grounds the anodes of The 2nd I F signal is f ed to Fl 1 monolithic crystal filter D20 and D21, and turns them OFF. Thus the noise pulse is installed as standard. When optional SSB crystal filter, FL-30, not fed to the following circuits.
  • Page 10 the MAIN unit. In the receive mode, D1 is turned ON and D10 (9.4665MHz+1kHz), 9.0115MHz, the center frequency of the is turned OFF by the RSV, and the signal is fed to the 1st 2nd IF signal is converted into 456kHz, 3rd IF signal. This gate of IF amplifier 01, dual gate MOS FET.

  • Page 11: Transmitting Circuits

    MHz crystal filter (or installed optional crystal filter) in the 2ND 3 – 2 TRANSMITTING CIRCUITS IF unit. 3 – 2 – 1 AF CIRCUITS The audio signal from the microphone is fed to pin 3 of IC4, Then the signal is fed to the doubly balanced mixer consisting operational amplifier on the MAIN unit, through the MIC GAIN of D1 through D4, which is the same one used in the control R14-2 on the front panel.
  • Page 12 The signal amplified by Q4 and Q5 is fed to the FIL (low- pass S3 is a switch to reduce the maximum power to 50 watts. filter) unit through LS impedance matching trans- former. When S3 is switched ON, a voltage is applied to the base of Q19 through D28 and R153 and Q19 is turned ON the same A thermal switch is mounted on the case of 04 and turns ON as in the AM mode.

  • Page 13: 31St Local Oscillator Circuits

    output signal is fed to the base of Q4, PLL mixer, through 3 – 3 1ST LOCAL OSCILLATOR CIRCUITS buffer amplifiers Q7 and Q8. To the emitter of Q4, the local The 1st local oscillator employs a premix system consisting of oscillator signal is fed and mixed with the VCO signal to mix a PLL and a crystal oscillator for each band.
  • Page 14 D12 through D33 are matrix diodes to convert the band signal Port I - 1 bit output into hexadecimal code for the CPU. I0: Reset signal output for sensor counter. The output signal from the mixer is then fed to the BPF unit. When the power switch is turned on, 13.

  • Page 15: Display Unit

    inverter, then Pin6 of IC3 as a switching signal. The other local oscillator in the 2nd I F unit to get 10Hz step frequency waveform-shaped signal is output from pin3 of IC2 and resolution. differentiated by C12 and R10, then fed to pin1 of IC3, 3 –...

  • Page 16: Section 4 Inside Views

    SECTION 4 INSIDE VIEWS TOP VIEW 4 – 1...
  • Page 17 BOTTOM VIEW RF UNIT 4 – 2...
  • Page 18 DISPLAY UNIT LPF UNIT and ACC BOARD PA UNIT 4 – 3...
  • Page 19 LOGIC UNIT IF UNIT 4 – 4...

  • Page 20: Section 5 Block Diagram

    SECTION 5 BLOCK DIAGRAM 5 – 1...

  • Page 21: Section 6 Options Installation

    This filter provides a 500Hz/6 dB pass band in the CW This unit provides terminals to put out a low level RF signals, operation. When the MODE Switch of IC-730 is set in the and for receiver input and T/R control on the rear panel of IC- "CW-N"...
  • Page 22 When installing IC -EX202 and/or IC·EX205. also remove the 6 – 3 ASSEMBLY PROCEDURE bottom cover by unscrewing the four screws on the bottom. 6 – 3 – 1 INSTALLATION OF THE IC-EX195 (MARKER UNIT) 1. PARTS LOCATION 2. ASSEMBLY PROCEDURE (1) Install this unit in the position shown in the photo using the (2) Plug P1 of this unit to J15 of the MAIN unit.
  • Page 23 (3) Make sure the power switch of your IC-730 is turned OFF. Set the other controls and switches in the receive mode according to the manual of IC·730. Then connect the power plug to the power socket of the IC-730.
  • Page 24 (3) Replace the shaft and the upper sub-chassis. Unplug P11 inserted to J3 of the OET unit and plug it to J1 of IC-EX203. (4) Plug P1 of IC-EX203 to J3 of the OET unit. Tighten the retaining screws of the sub-chassis. (5) This unit does not require an adjustment, and provides 150Hz/6dB pass band when the set is in the CW mode.
  • Page 25 (4) Loosen the screws of the saft coupling sleeve of the band (8) Run the cords with P1 and P2 of the LOA unit through the switch, and remove the shaft, sliding it towards the front side, slot under the band switch. Plug P1 (6-pln plug attached to then the sleeve and the spring pressing wafer of the band longer wires) to J3 and P2 (6-pin plug) to J6 of the PREMIX switch.
  • Page 26 (13) Run the cord with P3 (14-pin plug) of the LOA unit through the slot at the right corner of the rear box. Then plug P3 to J5 of the ACC unit. (14) Replace unplugged connectors and the rear panel by the reverse procedure of (11) and (12).
  • Page 27 2. INSTALLATION PROCEDURE 6 – 3 – 5 INSTALLATION OF THE FL-44 (A) (1) Remove the eight screws at each end of the rear panel. 1. INSTALLATION PROCEDURE (2) Turn over the rear panel right side or put it on the chassis, (1) Unscrew the screws retaining the MAIN unit board and and unplug coaxial cables from J1 and J3 on the LPF unit.
  • Page 28 (4) Replace the 2nd IF unit, and unplug P3 inserted to J7 on the unit, then plug it to J8. 6 – 3 – 6 INSTALLATION OF THE FL-30 1. INSTALLATION PROCEDURE (1) Loosen two retaining screws of the upper sub-chassis, and turn the sub-chassis over around hinges on the other end (5) Replace the sub-chassis by the reverse procedure of (1).
  • Page 29 6 – 4 SCHEMATIC DIAGRAMS Some components subject to change for an improvement without notice. 6 – 9...

  • Page 30: Section 7 Mechanical Parts And Disassembly

    SECTION 7 MECHANICAL PARTS AND DISASSEMBLY PARTS ON FRONT PANEL 7 – 1...
  • Page 32 FRONT PANEL DISASSEMBLY 1 7 – 2...
  • Page 33 FRONT PANEL DISASSEMBLY 2 7 – 3...
  • Page 34 FRONT PANEL DISASSEMBLY 3 7 – 4...
  • Page 35 FRONT PANEL DISASSEMBLY 4 7 – 5...
  • Page 36 FRONT PANEL DISASSEMBLY 5 7 – 6...
  • Page 37 FRONT PANEL DISASSEMBLY 6 7 – 7...
  • Page 38 FILTER UNIT DISASSEMBLY 7 – 8...
  • Page 39 PARTS OF THE REAR PANEL 7 – 9...
  • Page 40 REAR PANEL DISASSEMBLY 7 – 10...
  • Page 41 PA UNIT DISASSEMBLY 1 7 – 11...
  • Page 42 PA UNIT DISASSEMBLY 2 7 – 12...
  • Page 43 PA UNIT DISASSEMBLY 3 7 – 13...
  • Page 44 REAR PANEL WIRING 7 – 14...
  • Page 45 MAIN UNIT PC BOARD DISASSEMBLY 7 – 15...
  • Page 46 MAIN UNIT CONNECTOR LOCATION 7 – 16...
  • Page 47 7 – 17...
  • Page 48 7 – 18...
  • Page 49 7 – 19...
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  • Page 54: Section 8 Maintenance And Adjustment

    SECTION 8 MAINTENANCE AND ADJUSTMENT 8 – 1 MEASURING INSTRUMENTS REQUIRED FOR ADJUSTMENT (1) FREQUENCY COUNTER FREQUENCY RANGE 0.1 - 90MHz ACCURACY BETTER THAN ±1 ppm SENSITIVITY 100mV or BETTER (2) SIGNAL GENERATOR FREQUENCY RANGE 0.1 MHz - 40MHz OUTPUT VOLTAGE -20 - 90dB (0dB = 1μV) (3) MULTIMETER 50KΩ/VOLT OR BETTER...
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  • Page 73: Section 9 Voltage (Circuit) Diagrams

    SECTION 9 VOLTAGE (CIRCUIT) DIAGRAMS MAIN UNIT CIRCUIT & VOLTAGE DIAGRAM 9 – 1...
  • Page 74 9 – 2...
  • Page 75 9 – 3...
  • Page 76 LOGIC UNIT VOLTAGE WAVEFORMS 9 – 4...
  • Page 77 9 – 5...
  • Page 78 9 – 6...
  • Page 79 9 – 7...
  • Page 80 DET UNIT CIRCUIT & VOLTAGE DIAGRAM 9 – 8...
  • Page 81 9 – 9...
  • Page 82 FILTER UNIT CIRCUIT DIAGRAM 9 – 10...
  • Page 83 DISPLAY UNIT CIRCUIT DIAGRAM 9 – 11...
  • Page 84 9 – 12...
  • Page 85 ACC UNIT CIRCUIT DIAGRAM 9 – 13...
  • Page 86 REG UNIT CIRCUIT DIAGRAM SENSOR UNIT CIRCUIT DIAGRAM 9 – 14...

  • Page 87: Section 10 Parts List

    SECTION 10 PARTS LIST [EF] UNIT [EF] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Transistor 2SA1015 Connector LJ035-1-2(PHONES) Transistor 2SK30-Y Connector FM214-8SS (MIC) Pin Jack AT·700 (EXT ALC) Diode 1SS53 Pin Jack AT·700 (M BACK UP) Diode 1SS53 Jack...
  • Page 88 [RF] UNIT [RF] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. 2SK125 Resistor ELR25 2SK125 Resistor ELR25 Transistor 2SC945P Resistor ELR25 Transistor 2SC2053 Resistor ELR25 Transistor 2SC945P Resistor ELR25 3SK81 (3SK51) Resistor ELR25 3SK74M Resistor ELR25 Transistor 2SC945 Resistor ELR25...
  • Page 89 [RF] UNIT [RF] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Ceramic 0.0047 50V Choke EL0810SKI-101K Ceramic 0.0047 50V Coil LS-197 Ceramic Coil LS-197 Ceramic 0.75P Coil LS-197 Ceramic Coil LS-197 Ceramic 0.0047 50V Coil LS-197 Ceramic 0.0047 50V Coil LS-197...
  • Page 90 IF] UNIT [2ND IF] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. TA7124P Resistor ELR25 M51201L Resistor ELR25 Resistor 100K ELR25 3SK74M Resistor 100K ELR25 3SK74M Resistor ELR25 Transistor 2SC945P Resistor ELR25 Transistor 2SC945P Resistor 100K ELR25 Transistor 2SC945P Resistor...
  • Page 91 IF] UNIT [2ND IF] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Ceramic 0.0047 50V P.C. Board B-475C Ceramic 0.001 P.C. Board B-493A Ceramic Ceramic 0.0047 50V Cylinder Ceramic 0.0047 50V Ceramic 0.0047 50V Ceramic Ceramic 0.0047 50V Ceramic 0.0047 50V Ceramic...
  • Page 92 [MAIN] UNIT [MAIN] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. μPC2002V Resistor ELR25 NJM4558D Resistor 4.7K ELR25 NJM4558D Resistor ELR25 NJM4558D Resistor 2.2K ELR25 NJM4558D Resistor ELR25 NJM4558D Resistor 100K ELR25 Resistor ELR25 3SK74M Resistor ELR25 Transistor 2SC945P Resistor...
  • Page 93 [MAIN] UNIT [MAIN] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Resistor 3.3M ELR25 R137 Trimmer H1051C Resistor 820K ELR25 R138 Resistor ELR25 Resistor 820K ELR25 R139 Resistor 220K ELR25 Resistor 100K ELR25 R140 Resistor ELR25 Resistor ELR25 R141 Resistor...
  • Page 94 [MAIN] UNIT [MAIN] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Ceramic 0:0047 50V Choke LW15 Ceramic 0.001 Coil 102 L4 Electrolyte Ceramic 0.0047 50V Mechanical Filter MF-455-11AZ (or 11GZ) Ceramic 0.0047 50V Ceramic Filter CFW455HT Ceramic Crystal Filter 9M10A (9.0115MHz) Dip Mica...
  • Page 95 [DET] UNIT [DET] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Transistor 2SC945P Trimmer H0615A Transistor 2SC945P Trimmer H0615A Transistor 2SC1636 Resistor 3.3K Transistor 2SC2458 GR Resistor 4.7K ELR25 Transistor 2SC945P Resistor 4.7K ELR25 Transistor 2SC945P Resistor ELR25 Transistor 2SC945P...
  • Page 96 [DET] UNIT [PA] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Coil LS67 Transistor 2SC1971 Coil LS133 Transistor 2SC1945 Coil LS212 Transistor 2SC1945 Coil LS134 Transistor 2SC2097 Transistor 2SC2097 P.C. Board B-477C Transistor 2SD313 Transistor 2SC2120 Connector 5045-4A Connector 5045-4A...
  • Page 97 [PA] UNIT [FILTER] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Barrier Lay Diode 1N60 Barrier Lay Diode 1N60 Diode GP08B Choke LW·22 Trans LR117 Coil LA139 Choke LW18 Coil LR49 Trans LR113 Coil LR50 Choke LW18 Coil LR52 Choke...
  • Page 98 [FILTER] UNIT [LOGIC] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. μPD650-80 Electrolytic 220μ μPD4071C Ceramic 0.0047 50V μPD4011C Ceramic 0.0047 50V TC4013C μPD4013C P.C. Board B-478D μlPD4066C μPD4030C Relay SR-202 μPD4069C μA78L05ACC Connector 5045-4A Connector 5045-4A Connector 5045-4A Transistor...
  • Page 99 [LOGIC] UNIT [LOGIC] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Resistor 100K ELR25 P.C. Board B-488C Resistor ELR25 Resistor ELR25 Resistor ELR25 Resistor ELR25 Resistor ELR25 Resistor ELR25 Resistor 100K ELR25 Resistor Resistor ELR25 Resistor ELR25 Resistor ELR25 Resistor...
  • Page 100 [DISPLAY] UNIT [PLL] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. μPD549C TC9125P HD10551 9-BT-12 Transistor 2SC945P Transistor 2SC1214C Transistor 2SC763C Transistor 2SC763C Diode 1S953 Transistor 2SC763C Diode 1S953 Transistor 2SC945P Zener WZ040 2SK125 Zener WZ056 Transistor 2SC763C Diode 1SS53...
  • Page 101 [PLL] UNIT [PLL] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Ceramic 0.0047 50V Coil LS191 Electrolyte Coil LS3A Ceramic 0.0047 50V Coil LS3A Dip Mica 220P Choke 100 (EL0810SKI-100K) Dip Mica 220P Choke 2R7 (EL0810SKI-2R7) Dip Mica 220P Choke LW19...
  • Page 102 [PRE MIX] UNIT [PRE MIX] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Transistor 2SC945P Resistor ELR25 Transistor 2SC945P Resistor ELR25 Transistor 2SC945P Resistor 4.7K ELR25 Transistor 2SC945P Resistor ELR25 Transistor 2SC945P Resistor ELR25 Transistor 2SC945P Resistor ELR25 Transistor 2SC945P...
  • Page 103 [PRE MIX] UNIT [PRE MIX] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Ceramic Connector 5045-2A Ceramic 0.0047 50V Connector 5045-2A Ceramic 0.0047 50V Ceramic Ceramic 0.0047 50V Ceramic 0.0047 50V Ceramic Ceramic 0.0047 50V Ceramic 0.0047 50V Ceramic Ceramic 0.0047 50V...
  • Page 104 [BPF] UNIT [BPF] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Transistor 2SC763 Ceramic Transistor 2SC763 Ceramic Transistor 2SC2053 Ceramic 0.0047 50V Barrier Lay 0.047 Diode 1SS53 Ceramic 0.0047 50V Diode 1SS53 Ceramic Diode 1SS53 Ceramic 0.75P Diode 1SS53 Ceramic...
  • Page 105 [BPF] UNIT [SENSOR] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. Coil LS-192 Photo. Int. ON1105 Coil LS-192 Photo. Int. ON1105 Coil LS-192 Coil LS-192 Resistor Coil LS-192 Trimmer RGP056 30K Coil LS-192 Trimmer RGP056 30K Coil LS-192 Coil LS-192...
  • Page 106 [REGULATOR] UNIT [ACC] UNIT REF. NO. DESCRIPTION PART NO. REF. NO. DESCRIPTION PART NO. MB3756 Resistor 220 ELR25 Resistor 220 ELR25 Transistor 2SD313 Resistor 220 ELR25 Resistor 220 ELR25 Diode GP08B Resistor 15 ELR25 Diode GP08B Diode 1SS53 Resistor ELR25 Diode GP-08B Resistor...

  • Page 107: Section 12 Board Layout

    SECTION 12 BOARD LAYOUT EF UNIT 12 – 1...
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  • Page 123 ICOM INCORPORATED Some components subject to change for an improvement without notice. Printed in Japan...

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