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1、S-14719XZ-C1 May. 2011 HF/50 MHz TRANSCEIVER This service manual describes the latest technical information for the IC-7410 HF/50 MHZ 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 specified voltage. This will ru
2、in the transceiver. DO NOT expose the transceiver to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when connecting the transceiver. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the transceivers front-end. To upgrade
3、 quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. MODELVERSION IC-7410 USA EUR EUR-01 ITR ESP TPE KOR CHN FRA EXP Be sure to include the following four points when ordering replacement parts: 1. 10-digit Icom part number 2. Compone
4、nt name 3. Equipment model name and unit name 4. Quantity required 1110003491 S.IC TA31136FNG IC-7410 MAIN UNIT 5 pieces 8820001210 Screw 2438 screw IC-7410 Top cover 10 pieces Addresses are provided on the inside back cover for your convenience. ORDERING PARTS 1. Make sure that the problem is inter
5、nal before dis- assembling 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 circuits or electronic parts. An insulated tuning tool MUST be us
6、ed for all adjustments. 5. DO NOT keep power ON for a long time when the transceiver is defective. 6. DO NOT transmit power into a Standard Signal Generator or a Sweep Generator. 7. ALWAYS connect a 50 dB to 60 dB attenuator between the transceiver and a Deviation Meter or Spectrum Analyzer, when us
7、ing such test equipment. 8. READ the instructions of the test equipment throughly before connecting it to the transceiver. REPAIR NOTES INTRODUCTIONCAUTION Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the United Kingdom, German
8、y, France, Spain, Russia and/or other countries. TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 CIRCUIT DESCRIPITON 3-1 RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2 TRANSMITTER CI
9、RCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 3-3 FREQUENCY SYNTHESIZER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3-4 VOLTAGE DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . .
10、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3-5 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 SECTION 4 ADJUSTMENT PROCEDURES 4-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . .
11、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4-2 FREQUENCY ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4-3 TRANSMIT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、 . . . . . . . . . . . . . . . . . . 4-4 4-4 RECEIVE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 SECTION 5 PARTS LIST SECTION 6 MECHANICAL PARTS SECTION 7 BOARD LAYOUTS DISPLAY BOARD . . . . . . . . . . . . . . . . . . . .
13、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 PLL UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3 MAIN, RIT, JACK AND MIC UNITS. . . . . . . . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . . . . . . . . . . . . . . 7-5 CONNECT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7 PA-A UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、. . . . . . . . . . . . . . 7-9 VR-A/B/C, PBT AND NETWORK UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11 CTRL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13 BPF UN
16、IT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15 RF-A UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17 SECTION 8 WIRING
17、DIAGRAM SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM DISPLAY BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 CONNECT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . . 10-4 MAIN UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6 RF-A UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、 . . . . . . . . 10-11 BPF UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13 PA-A UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . 10-14 CTRL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16 NETWORK UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18 PLL
21、 UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19 1 - 1 SECTION 1. SPECIFICATIONS All stated specifi cations are typical and subject to change without notice or obligation. General Frequency coverage : (unit
22、: MHz) Receive 0.03060.000*1*2 Transmit 1.8001.999*2, 3.5003.999*2, 5.330500*3, 5.346500*3, 5.366500*3, 5.371500*3, 5.403500*3, 7.0007.300*2, 10.10010.150*2, 14.00014.350*2, 18.06818.168*2, 21.00021.450*2, 24.89024.990*2, 28.00029.700*2, 50.00054.000*2 *1Some frequency bands are not guaranteed. *2De
23、pending on version. *3 Only USA version. Mode : USB, LSB, CW, RTTY, AM, FM No. of memory channels : 101CH ( 99 regular, 2 scan edges) Antenna impedance : 50 ( at Antenna Tuner OFF) Antenna connector type : SO-239 2 Usable temperature range : 0C to +50C (+32F to +122F) Frequency stability : Less than
24、 0.5 ppm 5 min. after power ON. (0C to +50C; +32F to +122F) Frequency resolution : 1 Hz Power supply : 13.8 V DC 15% (negative ground) Power consumption Transmit Max. power : 23.0 A Receive Standby : 2.2 A Max. audio : 3.0 A Dimensions : 315(W) 116(H) 343(D) mm (projections not included) 12.4(W) 4.5
25、7(H) 13.5(D) in Weight (approx.) : 10.2 kg; 22.4 lb ACC connector : 13-pin CI-V connector : 2-conductor 3.5 (d) mm (18) Transmitter Output power (continuously adjustable) SSB/CW/RTTY/FM : 2 to 100 W AM : 2 to 27 W* (*Carrier power) (at 13.8 V DC/+25C) Modulation system SSB : Digital PSN modulation A
26、M : Digital Low power modulation FM : Digital Phase modulation Spurious emission HF bands : Less than 50 dB 50 MHz band : Less than 63 dB Carrier suppression : More than 40 dB Unwanted sideband suppression : More than 55 dB TX variable range : 9.999 kHz Microphone connector : 8-pin connector (600 )
27、ELEC-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 : Double superheterodyne system Intermediate frequencies 1st : 64.455 MHz 2nd : 36 kHz Sensitivity SSB, CW : 0.16 V
28、(1.8029.99 MHz)*4 (10 dB S/N) BW=2.4 kHz 0.13 V (50.054.0 MHz)*5 AM (10 dB S/N) : 12.6 V (0.51.799 MHz)*4 BW=6 kHz 2.0 V (1.8029.99 MHz)*4 1.6 V (50.054.0 MHz)*5 FM (12 dB SINAD) : 0.5 V (28.029.7 MHz)*4 BW=15 kHz 0.32 V (50.054.0 MHz)*5 Squelch sensitivity Frequency bandSquelch sensitivity HF SSB :
29、 Less than 5.6 V*4 FM: Less than 0.32 V*4 50 MHz SSB : Less than 5.6 V*5 FM: Less than 0.32 V*5 *4 Preamp 1 is ON. *5 Preamp 2 is ON. Selectivity (IF fi lter shape is set to SHARP.) SSB (BW: 2.4 kHz) : More than 2.4 kHz/6 dB Less than 3.4 kHz/40 dB CW (BW: 500 Hz) : More than 500 Hz/6 dB Less than 7
30、00 Hz/40 dB RTTY (BW: 350 Hz) : More than 500 Hz/6 dB Less than 800 Hz/40 dB AM (BW: 6 kHz) : More than 6.0 kHz/6 dB Less than 10.0 kHz/40 dB FM (BW: 15 kHz) : More than 12.0 kHz/6 dB Less than 22.0 kHz/40 dB Spurious and image rejection ratio : More than 70 dB AF output power : More than 2.0 W at 1
31、0% (at 13.8 V DC) distortion with an 8 load RIT variable range : 9.999 kHz PHONES connector : 3-conductor 6.35 (d) mm (14) External SP connector : 2-conductor 3.5 (d) mm (18)/8 DSP ANF attenuation : More than 30 dB (with 1 kHz single tone) DSP MNF attenuation : More than 70 dB DSP NR attenuation : M
32、ore than 6 dB (noise rejection in SSB) Antenna tuner Matching impedance range HF bands : 16.7 to 150 unbalanced (Less than VSWR 1:3) 50 MHz band : 20 to 125 unbalanced (Less than VSWR 1:2.5) Minimum operating input : 8 W (HF bands) power 15 W (50MHz band ) Tuning accuracy : VSWR 1:1.5 or less Insert
33、ion loss (after tuning at RF power 100W) 1.8 MHz band : 1.2 dB or less Bands other than 1.8 MHz : 1.0 dB or less 2 - 1 SECTION 2. INSIDE VIEWS BPF UNIT THE VIEW FROM THE BOTTOM OF CHASSIS USB HUB (IC902) USB BRIDGE (IC901) BUS BUFFER (IC901) 8 V REGULATOR (IC124) 3.3 V REGULATOR (IC122) USB CODEC (I
34、C551) 5 V REGULATOR (IC121) PRE-AMP (Q532) PRE-AMP (Q511, Q512) YGR AMP (IC201) PROGRAMMABLE CLOCK GENERATOR (IC662) 32 MHz REFERENCE FREQUENCY OSCILLATOR (X151) 1ST TX/RX LO FILTER (FI401) SERIAL-PARALLEL CONVERTER (IC104) LEVEL CONVERTER (IC353) SERIAL-PARALLEL CONVERTER (IC103) PLL IC (IC201) VCA
35、 (IC301) AF LPF (IC211) VARIABLE CAPACITORS BPF UNIT NETWORK UNIT CONNECT UNIT PLL UNIT 2 - 2 DISPLAY UNIT LCD CONTRAST DC AMP (IC152) LCD DRIVER (IC501) LCD DRIVER (IC541) MULTIPLEXER (IC371) LCD DRIVER (IC521) FRONT CPU (IC401) CMOS LOGIC IC (IC271) MULTIPLEXER (IC351) FRONT CPU CLOCK (X401) LCD C
36、ONTRAST DC AMP (IC151) PTT SW BUFFER (Q501) LCD DRIVER (IC561) 2 - 3 DC-DC CONVERTER (IC2001, D2001, D2002) MAIN UNIT (TOP VIEW) S/P CONVERTER (IC3201) CODEC IC (IC4461) VOX LPF (IC3452) VCA (IC3401) AGC LEVEL DETECT (IC3532) DC AMP (IC3271) DC AMP (IC3675) DSP (IC4001) EEPROM (IC4202) D/A CONVERTER
37、 (IC3204) AGC BUFFER (IC4601) 3RD TX IF MIXER (IC3621) CURRENT AMP (IC3251) CI-V LINE BUFFER (IC1001) CPLD (IC1261) TX POWER LEVEL BUFFER (IC1163) MAIN CPU (IC1201) VOX BUFFER (IC4403) MAIN CPU (IC1201) 2 - 4 MAIN UNIT (BOTTOM VIEW) AF LPF (IC4603) TX AF BUFFER (IC4401) AF LPF (IC4402) CMOS BUFFER (
38、IC6102) MULTIPLEXER (IC1161) X3R3V LINE SW (IC2101) AF AMP (IC4661) AGC AMP (IC3523) RX AF BUFFER (IC4602) CMOS BUFFER (IC6101) CMOS BUFFER (IC6103) AF AMP (IC4483) AF BUFFER (IC4482) 3RD TX IF AMP (IC3601) 2 - 5 DC-DC CONVERTER (IC131) PA-A UNIT D/A CONVERTER (IC431) S/P CONVERTER (IC432) DRIVE AMP
39、 (Q221) DC AMP (IC371) BIAS CONTROLLER (IC301) DRIVE AMP (Q222) POWER AMP (Q241) POWER AMP (Q242) PRE-DRIVE AMP (Q201) 2 - 6 TUNER CPU (IC701) CTRL UNIT DC AMP (IC131) +5V LINE REGULATOR (IC801) DC AMP (IC41) PHASE DETECTOR (IC111) TX POWER DETECTOR (D602) 3 - 1 SECTION 3. CIRCUIT DESCRIPTION 3-1 RE
40、CEIVER CIRCUITS ANTENNA SWITCHING CIRCUITS (CTRL UNIT) RX signal from the antenna connector ANT1 (J1) or ANT2 (J2) is passed through the antenna switch (RL501), current detector (D401), tuner switches (RL351 and RL301), RX line switches (RL601 and RL621) and LPF, and then applied to the BPF UNIT. AT
41、TENUATOR CIRCUITS (BPF UNIT) The RX signal from the CTRL UNIT is passed through or bypassed the attenuator circuit (RL141, R141R143), depending on the setting. The RX signal, which is passed though or bypassed the attenuator circuit (RL141, R141R143), is applied to the BPF circuits. BPF CIRCUITS (BP
42、F UNIT) The RX signal from the attenuator circuits is passed through an LPF or one of BPFs, depending on the operating frequency, to remove unwanted out-of-band signals. The filtered RX signal is applied to or bypassed the preamplifi er circuits. CURRENT DET D401 TUNING NETWORK LPF HF ANT1 HF ANT2 B
43、PF BPF BPF BPF BPF BPF RL141 BPF HPF BPF ATTLPF BPF PRE AMP Q511/Q512 To the 1st RX IF circuits PRE AMP Q532 RL601 RL621 RL301 CTRL UNIT RL501 RL351 1.6-2.0 MHz 4.0-8.0 MHz 50.0-54.0 MHz 30.0-50.0 MHz 11.0-15.0 MHz 8.0-11.0 MHz 54.0-60.0 MHz 2.0-4.0 MHz 15.0-22.0 MHz 22.0-30.0 MHz BPF UNIT 0.03-1.6
44、MHz NETWORK UNIT PREAMPLIFIER CIRCUITS (BPF UNIT) The RX signal from the BPF circuits is applied to or bypassed the preamplifi er. When the Preamplifier function is activated, the RX signal is amplifi ed by one of preamplifi ers (Q511, Q512 (for 1.82.1 MHz) or Q532 (for 2450 MHz). The amplifi ed or
45、bypassed RX signal is applied to the RF-A UNIT. ANTENNA SWITCHING CIRCUITS TO PREAMPLIFIER CIRCUITS 3 - 2 1ST RX IF AND 2ND RX IF CIRCUITS DEMODULATOR CIRCUITS 1ST RX IF CIRCUITS (RF-A UNIT) The RX signal from the BPF UNIT is passed through the LPF, which removes unwanted signals (60 MHz and higher)
46、, and then applied to the 1st RX IF mixer (Q721Q724) to be mixed with the 1st RX LO signal (64.485124.455 MHz) from the PLL UNIT, resulting in the 64.455 MHz 1st RX IF signal. The 1st RX IF signal is amplified by the 1st RX IF AMP (Q741) and passed through one of the 1st IF fi lters (FI911; FL-434,
47、or optional FL-430 or FL-431), which has different passband widths, according to the IF fi lter setting. The fi ltered 1st RX IF signal is amplifi ed by the RX IF AMPs (Q1051 and Q1071, Q1072), and then applied to the 2nd RX IF circuits. 2ND RX IF CIRCUITS (RF-A UNIT) The 1st RX IF signal from the 1
48、st RX IF circuits is divided into two paths, and then each signal is applied to the 2nd RX IF mixers (the image reduction mixers; D1102/D1101) to be mixed with the 2nd RX LO signal (64.491 MHz) from the PLL UNIT, resulting in the 36 kHz 2nd RX IF signal. The image reduction mixer removes image frequ
49、ency components by using two LO signals which are 90 degrees phase-shifted from each other. The 2nd RX IF signals are independently amplified by the buffers (Q1201/Q1251) and IF AMPs (IC1221). These amplifi ed 2nd RX IF signals are 90 degrees phase- shifted and combined by the combiner (IC1222), and then applied to the MAIN UNIT. IF AMP I C1221 BUFF Q1251 IF AMP I C1221 I C1222 To the demodulator circuits IF AMP Q1051 BUFF Q1201 D1101 IF AMP Q
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