IC-2730A_E_serv.pdf

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1、S-15120XZ-C1 March 2015 DUAL BAND TRANSCEIVER This service manual describes the latest technical informa- tion for the IC-2730A and IC-2730E DUAL BAND TRANSCEIVER, at the time of publication. NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than the specifi ed vol

2、tage. This will ruin the transceiver. DO NOT expose the transceiver to rain, snow or 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 fro

3、nt-end. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. MODELVERSION VERSION NUMBER TX POWER IC-2730A TPE-01#0425 W/15 W/5 W USA-01#05 50 W/15 W/5 W KOR-01#06 EXP-01#09 IC-2730E EUR-01#02 ITR-01#03 CHN-01#10 Be sure to

4、include the following four points when ordering replacement parts: 1. 10-digit Icom part number 2. Component name 3. Equipment model name and unit name 4. Quantity required 1110003491 S.IC TA31136FNG IC-2730A MAIN UNIT 5 pieces 8820001210 Screw 2438 screw IC-2730E Top cover 10 pieces Addresses are p

5、rovided on the inside back cover for your convenience. ORDERING PARTS 1. Make sure that the problem is internal before dis-assem- bling the transceiver. 2. DO NOT open the transceiver until the transceiver is dis- connected from its power source. 3. DO NOT force any of the variable components. Turn

6、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 trans- ceiver is defective. 6. DO NOT transmit power into a Standard Signal Generator or a Sweep Generator, otherwis

7、e the RF power may dam- age them. 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 the test equipment thoroughly before connecting it to the transceiver. REPAIR NOTES INTRODUC

8、TIONCAUTION (IC-2730A) Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the United Kingdom, Germany, France, Spain, Russia, Australia, New Zealand, and/or other countries. TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE

9、 VIEWS SECTION 3 DISASSEMBLY INSTRUCTION SECTION 4 CIRCUIT DESCRIPITON 4-1 RECEIVER CIRCUITS . 4-1 4-2 TRANSMIT CIRCUITS . 4-5 4-3 FREQUENCY SYNTHESIZER CIRCUITS . 4-7 4-4 VOLTAGE BLOCK DIAGRAM . 4-8 SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION . 5-1 5-2 FREQUENCY ADJUSTMENT . 5-3 5-3 TRANSMIT AD

10、JUSTMENT . 5-3 5-4 RECEIVE ADJUSTMENT . 5-5 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS SECTION 8 BOARD LAYOUTS SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM 1-1 SECTION 1. SPECIFICATIONS DGeneral Frequency coverage: EUR RX118174 MHz*1, 375550 MHz*2 TX144146 MHz, 430440 MHz ITR RX118136.991

11、66 MHz*3, 144146 MHz, 430434 MHz, 435438 MHz TX144146 MHz, 430434 MHz, 435438 MHz TPERX, TX 144146 MHz, 430432 MHz USA RX118174 MHz*4, 375550 MHz*5 TX144148 MHz, 430450 MHz*5 KORRX, TX 144146 MHz, 430440 MHz EXP, CHN RX118174 MHz*4, 375550 MHz*2 TX137174 MHz*4, 400470 MHz*2 *1 Guaranteed only 144146

12、 MHz *2 Guaranteed only 430440 MHz *3 Not guaranteed *4 Guaranteed only 144148 MHz *5 Guaranteed only 430450 MHz Mode: F2D/F3E (FM/FM-N), A3E (AM/AM-N) RX only Number of memory channels: 1000 channels Number of program scan channels: 25 channels (2 edge frequencies in each channel) Number of call ch

13、annels: 2 channels Scan types: Full, Band, Program, Priority, Memory channel, Bank, Skip and Tone scans Antenna connector: SO-239 Antenna impedance: 50 Usable temperature range: 10C to +60C, +14F to +140F Frequency stability: 2.5 ppm (10C to +60C, +14F to +140F) Frequency resolution: 5 kHz, 6.25 kHz

14、, 8.33 kHz, 10 kHz, 12.5 kHz, 15 kHz, 20 kHz, 25 kHz, 30 kHz, 50 kHz The 8.33 kHz step is not selectable, depending on the operating band or mode. Power supply: 13.8 V DC 15% (negative ground) Current drain: Transmit Maximum current drain: 10.5 A at 25 W (TPE version) 13.0 A at 50 W (Other versions)

15、 Receive Standby: 1.2 A Maximum audio: 1.8 A Dimensions (projections not included): Main unit: 150(W) 40(H) 151(D) mm, 5.9(W) 1.6(H) 5.9(D) inches Controller: 150(W) 50(H) 27.2(D) mm, 5.9(W) 2(H) 1.1(D) inches Weight (approximately): Main unit: 1.2 kg, 2.6 lb Controller: 140 g, 4.9 oz DTransmitter M

16、odulation system: Variable reactance frequency modulation Type of emission: F2D, F3E Maximum deviation: FM: 5.0 kHz FM-N: 2.5 kHz Input impedance (Mic): 600 Spurious emission: 60 dBc Output power: High 25 W, Mid 15 W, Low 5 W (TPE version) High 50 W, Mid 15 W, Low 5 W (Other versions) 1-2 DReceiver

17、Receive system: Double superheterodyne system IF frequencies: Left band 1st IF 38.85 MHz 2nd IF 450 kHz Right band 1st IF 46.35 MHz 2nd IF 450 kHz Sensitivity (except spurious points): Amateur bands FM/FM-N (12 dB SINAD) 0.18 V Except Amateur bands FM/FM-N (12 dB SINAD) 0.32 V (137.000159.995 MHz) 0

18、.56 V (160.000174.000 MHz) 0.56 V (375.000399.995 MHz) 0.32 V (400.000499.995 MHz) 0.56 V (500.000550.000 MHz) AM (10 dB S/N) 1 V (118.000136.99166 MHz) Squelch sensitivity: 0.13 V (Threshold) Selectivity: FM 60 dB FM-N 55 dB Spurious and image rejection ratio: 60 dB 55 dB (Left band UHF) AF output

19、power: 2.0 W (at 10% distortion into an 8 load) Output impedance (Speaker): 8 2-1 SECTION 2. INSIDE VIEWS CONTROL UNIT RESET IC (IC5) +3.3 V REGULATOR (IC7) CLONING DATA LINE BUFFER (IC102) LCD DRIVER (IC2) CPU (IC1) +3.3 V REGULATOR (IC6) 2-2 MAIN UNIT (TOP VIEW) EXPANDER (IC315) MIC MUTE SW/MIC GA

20、IN SW (IC100) VOX AMP/IDC AMP/AF LPF (IC112) AF LPF/AF BUFFER (IC103) D/A CONVERTER (IC102) MODULATION MUTE SW (IC205) IF IC (Right band) (IC120) 1ST IF FILTER (Right band) (FI104) AF SW (IC109) ELECTRONIC VOLUME IC (IC110) +3.3 V REGULATOR (IC314) D/A CONVERTER (IC1) 1ST IF FILTER (Right band) (FI1

21、05) EXPANDER (IC316) IF IC (Left band) (IC121) NOISE AMP (Right band) (IC122) NOISE AMP (Left band) (IC123) EXPANDER (IC317) MIC AMP (IC101) AND LOGIC GATE IC (IC108) CLONING DATA LINE BUFFER (IC312) AF LINE MUTE SW (IC111) +5 V REGULATOR (IC319) EEPROM (IC301) RESET IC (IC308) 2-3 TX POWER AMP (UHF

22、 band) (IC4) TX POWER AMP (VHF band) (IC3) MAIN UNIT (BOTTOM VIEW) AF MUTE SW (IC104) CPU (IC300) +3.3 V REGULATOR (IC306) PLL IC (Left band) (IC201) AF POWER AMP (IC106) AF POWER AMP (IC105) +8 V REGULATOR (IC325) +8 V REGULATOR (IC313) +8 V REGULATOR (IC321) REFERENCE FREQUENCY OSCILLATOR (Right b

23、and) (X201) PLL IC (Right band) (IC206) 2ND IF FILTER (Right band) (FI100) 2ND IF FILTER (Right band) (FI101) DISCRIMINATOR (Right band) (X101) 2ND IF FILTER (Left band) (FI102) 2ND IF FILTER (Left band) (FI103) AF LINE SW (IC119) DISCRIMINATOR (Left band) (X102) REFERENCE FREQUENCY OSCILLATOR (Left

24、 band) (X200) CLOCK OSCILLATOR (X300) VOLTAGE DETECTOR IC (IC320) VOLTAGE DETECTOR IC (IC324) +3.3 V REGULATOR (IC311) CURRENT DETECTOR IC (IC310) 3-1 SECTION 3. DISASSEMBLY INSTRUCTION 1. Removing the CONTROL UNIT 1) Remove all knobs from the controller. Controller 2) Remove four screws from the re

25、ar panel. 3) Separate the rear panel from the front panel as- sembly. Front panel assembly Rear panel 4) Remove the CONTROL UNIT from the front panel. Front panel CONTROL UNIT 2. Removing the MAIN UNIT 1) Remove eight screws from the top cover. 2) Remove the top cover from the chassis. Top cover CHA

26、SSIS Screws 8 3) Disconnect the speaker cable from the MAIN UNIT. 4) Remove the clip from the chassis. SPEAKER CABLE Speaker CHASSIS Clip 5) Remove seven screws from the bottom cover. CHASSIS Bottom cover Screws7 (Continued on the next page.) 3-2 6) Unsolder three points at the antenna connector. 7)

27、 Disconnect the cooling fan cable. Solder remover COOLING FAN CABLE UNSOLDER 8) Remove total of 17 screws from the MAIN UNIT. Screws 17 9) Remove the MAIN UNIT from the chassis. MAIN UNIT CHASSIS 4-1 SECTION 4. CIRCUIT DESCRIPTION 4-1 RECEIVE CIRCUITS RF CIRCUITS The received signal from the antenna

28、 connector passed through the LPF (L90, L94, L96, C409, C418 and C428). The fi ltered signal is applied to either the VHF or UHF bands RF circuit. VHF BAND (118174 MHz) The received VHF band signal from the LPF (L90, L94, L96, C409, C418 and C428) is passed through the LPF (L79, L83, L87, C378, C386

29、 and C394) and TX/RX SW (D66, D69 to D71 and D77), and applied to the PRE-AMP (Q24). Left band The amplifi ed signal is passed through the attenuator (D34) and tuned BPF (D28, D88, L31, L34, C119, C127, C128 and C135), and applied to the RF AMP (Q20). The amplifi ed sig- nal is passed through the tu

30、ned BPF (D20, D87, L10, L18, C60, C71, C74, C79 and C86), and then applied to the 1st mixer (Q145). Right band The amplifi ed signal is passed through the attenuator (D33) and tuned BPF (D27, D85, L23, L32, L33, C116, C125, C126 and C132), and applied to RF AMP (Q19). The amplifi ed sig- nal is pass

31、ed through the tuned BPF (D19, D86, L9, L17, C57, C69, C70, C77 and C84), and then applied to the 1st mixer (Q143). UHF BAND (375550 MHz) The received UHF band signal from the LPF (L90, L94, L96, C409, C418 and C428) is passed through the HPF (L84, L88, C392, C395 and C429), TX/RX SW (D68, D73, D75,

32、 D84, L86, L92, C387, C396 and C413), and applied to the PRE- AMP (Q23). Left band The amplifi ed signal is passed through the attenuator (D32) and tuned BPF (D22, D24, D26, D30, L21, L28 and L101), and applied to the RF AMP (Q18). The amplifi ed signal is passed through the tuned BPF (D12, D16, D91

33、, D92, L4, L12, L16, L102, C33, C65 and C67), and then applied to the 1st mixer (Q146). Right band The amplifi ed signal is passed through the attenuator (D31) and tuned BPF (D21, D23, D25, D29, L22, L27 and L99), and applied to the RF AMP (Q17). The amplifi ed signal is passed through the tuned BPF

34、 (D11, D15, D89, D90, L3, L11, L15, L100, C32, C63 and C66), and then applied to the 1st mixer (Q144). RF CIRCUITS BPF HPF RF AMP RF AMP ATT TX/RX SW BPF BPF BPF ATT RF AMP LPF BPF ANTENNA BPF RF AMP BPF LPF RF AMP RF AMP ATT TX/RX SW BPF ATT LIMITER LIMITER 118-550MHz 118-174MHz 375-550MHz 118-174M

35、Hz Left band (VHF) Right band (VHF) Left band (UHF) Right band (UHF) 375-550MHz 400-470MHz 137-174MHz VHF TX circuit UHF TX circuit D68,D73, D84,D75 D66,D69 D79D81 Q24 D34D28,D88Q20D20,D87 D33D27,D85Q19D19,D86 Q23 D32D22,D24,D26,D30Q18D12,D16,D91,D92 D31D21,D23,D25,D29Q17D11,D15,D89,D90 D70,D71,D77

36、4-2 1ST IF CIRCUITS VHF BAND Left band The received signal from the RF circuit and 1st LO signal are applied to the 1st IF mixer (Q145) and mixed, resulting in the 38.85 MHz 1st IF signal. The 1st IF signal is applied to the 1st IF fi lter (FI105), through the band SW (D121). Right band The received

37、 signal from the RF circuit and 1st LO signal are applied to the 1st IF mixer (Q143) and mixed, resulting in the 46.35 MHz 1st IF signal. The 1st IF signal is applied to the 1st IF fi lter (FI104), through the band SW (D119). UHF BAND Left band The received signal from the RF circuit and 1st LO sign

38、al are applied to the 1st IF mixer (Q146) and mixed, resulting in the 38.85 MHz 1st IF signal. The 1st IF fi lter is applied to the 1st IF fi lter (FI105), through the band SW (D122). Right band The received signal from the RF circuit and 1st LO signal are applied to the 1st IF mixer (Q144) and mixe

39、d, resulting in the 46.35 MHz 1st IF signal. The 1st IF signal is applied to the 1st IF fi lter (FI104), through the band SW (D120). The fi ltered signal is amplifi ed by the IF AMP (Q137), and ap- plied to the IF IC (IC120, pin 20). 1ST IF CIRCUITS IF AMP BPF XTAL IF AMP BPF XTAL RX SW RX SW Left b

40、and VHF RF circuit Right band VHF RF circuit Left band UHF RF circuit Left band 1st LO (UHF) Right band 1st LO (UHF) Right band 1st LO (UHF) Left band 1st LO (VHF) Right band UHF RF circuit Left band 1st IF circuit Right band 1st IF circuit Left band 2nd IF circuit Right band 2nd IF circuit 46.35MHz

41、 38.85MHz Q137FI104 Q138FI105 Q144 Q146 Q143 Q145 D119,D120 D121,D122 2ND IF CIRCUITS Left band IC121 is an IF IC, which contains the 2nd mixer, limiter AMP, noise AMP, quadrature detector, AM detector, AGC controller, signal strength detector, and so on. The 1st IF signal from the 1st IF AMP (Q138)

42、 and 38.4 MHz 2nd LO signal are mixed, resulting in the 450 kHz 2nd IF sig- nal. The 2nd IF signal is output from pin 3, and passed through the ceramic fi lter (FI102: For FM-N or FI103: For FM), and then applied to IC121 from pins 5 and 7. Right band IC120 is an IF IC, which contains the 2nd mixer,

43、 limiter AMP, noise AMP, quadrature detector, AM detector, AGC controller, signal strength detector, and so on. The 1st IF signal from the 1st IF AMP (Q137) and 45.9 MHz 2nd LO signal are mixed, resulting in the 450 kHz 2nd IF sig- nal. The 2nd IF signal is output from pin 3, and passed through the

44、ceramic fi lter (FI100: For FM-N or FI101: For FM), and then applied to IC120 from pins 5 and 7. FM DEMODULATION CIRCUITS Left band The 2nd IF signal applied pin 7 is amplifi ed by the limiter AMP, and then demodulated by the quadrature detector with the ceramic resonator (X102). The demodulated AF

45、signal is output from pin 11, and then ap- plied to the AF circuit, through the AF SW (IC119, pins 8, 9). Right band The 2nd IF signal applied pin 7 is amplifi ed by the limiter AMP, and then demodulated by the quadrature detector with the ceramic resonator (X101). The demodulated AF signal is outpu

46、t from pin 11, and then ap- plied to the AF circuit, through the AF SW (IC119, pins 1, 2). 4-3 AM DETECTOR CIRCUITS Left band The 2nd IF signal applied from pin 5 is amplifi ed by the IF AMP, and then demodulated by the amplitude detector in the IF IC (IC121). The demodulated AF signal is output fro

47、m pin 14, and then applied to the AF circuits, through the AF SW (IC119, pins 11, 10). In the AM mode, the AGC circuit in the IF IC automatically adjusts the gain of RF AMPs (Q18 and Q20) and 1st IF AMP (Q138), to keep the signal level constant. The demodulated AF signal is applied to the RX AF circuit. Right band The 2nd IF signal applie