IC-7300.pdf

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1、S-15218XZ-C1 March 2016 HF/50 MHz TRANSCEIVER This service manual describes the latest technical informa- tion for the IC-7300 HF/50 MHz transceiver, at the time of pub- lication. NEVER connect the transceiver to a DC power supply that uses more than the specified voltage. This will ruin the trans-

2、ceiver. DO NOT expose the transceiver to rain, snow or liquids. DO NOT reverse the polarities of the power supply when di- rectly applying power to the transceiver/circuit. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the transceivers front-end.

3、To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. Be sure to 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. Quant

4、ity required 1180004830 XC6222A331MR IC-7300 MAIN UNIT 5 pieces 8110010940 3765 U-COVER IC-7300 CHASSIS 1 piece Addresses are provided on the inside back cover for your convenience. ORDERING PARTS 1. Make sure that the problem is internal before disassem- bling the transceiver. 2. DO NOT open the tr

5、ansceiver until the transceiver is dis- connected 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 used for all adjustments. 5. DO NOT keep power ON for a long time

6、 when the trans- ceiver is defective. 6. NEVER directly transmit power into any test equipment such as Standard Signal Generator or a Sweep Generator, otherwise the RF power may damage them. 7. ALWAYS connect a 50 dB to 60 dB attenuator between the transceiver and such test equipment. 8. READ the in

7、structions of the test equipment thoroughly before connecting it to the transceiver. REPAIR NOTES INTRODUCTIONSERVICE CAUTION 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, Aust

8、ralia, New Zealand, and/or other countries. MODELVERSION VERSION NUMBER OPERATABLE BANDS IC-7300 USA#02HF/50 MHz EUR#03HF/50/70 MHz ITR#05 ESP#06 TPE#07HF/50 MHz KOR#08 EXP#12 TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 CIRCUIT DESCRIPTION 3-1 PA UNIT . 3-1 3-2 RF UNI

9、T . 3-2 3-3 MAIN UNIT . 3-3 SECTION 4 ADJUSTMENT PROCEDURE 4-1 PREPARATION . 4-1 4-2 RECEIVE ADJUSTMENTS . 4-2 4-3 TX IDLING CURRENT ADJUSTMENTS . 4-3 4-4 TX POWER ADJUSTMENTS . 4-4 4-5 TX AMPLIFIER ADJUSTMENTS . 4-5 4-6 FREQUENCY ADJUSTMENTS . 4-6 SECTION 5 PARTS LIST SECTION 6 MECHANICAL PARTS SEC

10、TION 7 BOARD LAYOUTS SECTION 8 GENERAL WIRING SECTION 9 BLOCK DIAGRAM SECTION 10 SCHEMATIC DIAGRAM 1-1 SECTION 1 SPECIFICATIONS M General Frequency coverage (unit: MHz): Receiver 0.030000 74.800000*1 Transmitter 1.800000 01.999999*2 3.500000 03.999999*2 5.255000 05.405000*2 7.000000 07.300000*2 10.1

11、00000 10.150000*2 14.000000 14.350000*2 18.068000 18.168000*2 21.000000 21.450000*2 24.890000 24.990000*2 28.000000 29.700000*2 50.000000 54.000000*2 70.000000 70.500000*2 *1 Some frequency ranges are not guaranteed. *2 Depending on the transceiver version. Operating modes: USB/LSB (J3E), CW (A1A),

12、RTTY (F1B), AM (A3E) and FM (F3E) Number of memory channels: 101 (including 2 scan edges) Antenna connector: SO-239 (antenna impedance: 50 unbalanced) Power supply requirement: 13.8 V DC (15%) Operating temperature range: 10C to +60C, +14F to +140F Frequency stability: Less than 0.5 ppm (10C to +60C

13、, +14F to +140F) Frequency resolution: 1 Hz (minimum) Power consumption: Receive Standby 0.9 A Maximum audio 1.25 A Transmit Maximum power 21.0 A Dimensions (projections not included): 240 (W)94 (H)238 (D) mm, 9.4 (W)3.7 (H)9.4 (D) in Weight (approximately): 4.2 kg, 9.3 Ib M Transmitter Transmit out

14、put power: HF and 50 MHz bands SSB/CW/RTTY/FM 2100 W AM 125 W 70 MHz band*2 SSB/CW/RTTY/FM 250 W AM 112.5 W *2 Depending on the transceiver version. Modulation system: SSB P.S.N. modulation AM Low power modulation FM Reactance modulation Spurious emission: Harmonics Less than 50 dB (1.828 MHz) Less

15、than 63 dB (50 MHz band) Less than 60 dB (70 MHz band*2) Out-of-band emission Less than 40 dB (1.828 MHz) Less than 60 dB (50 MHz band) Less than 60 dB (70 MHz band*2) *2 Depending on the transceiver version. Carrier suppression: More than 50 dB Unwanted sideband suppression: More than 50 dB Input i

16、mpedance (microphone): 600 1-2 M Receiver Receive system: Direct sampling superheterodyne Intermediate frequency: 36 kHz Sensitivity (Filter: SOFT): SSB/CW (at 10 dB S/N) 1.8 29.999999 MHz Less than 123 dBm (0.16 V) (P.AMP1 ON) 50 MHz band Less than 125 dBm (0.13 V) (P.AMP2 ON) 70 MHz band*2 Less th

17、an 123 dBm (0.16 V) (P.AMP2 ON) *2 Depending on the transceiver version. AM (at 10 dB S/N) 0.5 1.8 MHz Less than 85 dBm (12.6 V) (P.AMP1 ON) 1.8 29.999999 MHz Less than 101 dBm (2.0 V) (P.AMP1 ON) 50 MHz and 70 MHz bands Less than 107 dBm (1.0 V) (P.AMP2 ON) FM (at 12 dB SINAD) 28.0 29.7 MHz Less th

18、an 113 dBm (0.5 V) (P.AMP1 ON) 50 MHz and 70 MHz bands Less than 119 dBm (0.25 V) (P.AMP2 ON) Squelch sensitivity (threshold): SSB Less than 92 dBm (5.6 V) FM Less than 117 dBm (0.3 V) (HF band: P.AMP1 ON, 50 MHz band: P.AMP2 ON) Selectivity (Filter: SHARP): SSB (BW=2.4 kHz) More than 2.4 kHz/6 dB L

19、ess than 3.4 kHz/40 dB CW (BW=500 Hz) More than 500 Hz/6 dB Less than 700 Hz/40 dB RTTY (BW=500 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 kHz/40 dB FM (BW=15 kHz) More than 12.0 kHz/6 dB Less than 22 kHz/40 dB Spurious and image rejection: Mor

20、e than 70 dB (except for ADC aliasing) Audio output power: More than 2.5 W (at 10% distortion into the 8 load, at the 1 kHz reference) Output impedance (Speaker): 8 RIT variable range: 9.999 kHz M Antenna tuner Tunable impedance range: 16.7150 (unbalanced) (less than 3:1 VSWR) Tuning accuracy: Less

21、than 1.5:1 VSWR Tuning time (approximately): 23 seconds (average) 15 seconds (maximum) LAll stated specifications are typical and subject to change without notice or obligation. 2-1 SECTION 2 INSIDE VIEWS ? (?) MAIN UNIT ? UNIT (BOTTOM VIEW) ? (?) AF LPF (IC1002) 32 MB FLASH MEMORY (IC902) 64 MB FLA

22、SH MEMORY (IC391) CPU (IC301) REAL TIME CLOCK (IC381) 8-Bit SHIFT REGISTER (IC141) DSP (IC901) D/A CONVERTER (IC1331) ? (?) 3.3 V REGULATOR (IC241) ? (?) ADJUSTABLE STEP-DOWN CONVERTER (IC261) ADJUSTABLE STEP-DOWN CONVERTER (IC251) 8 V REGULATOR (IC271) 8 V REGULATOR (IC276) DC AMP (IC151) DATA LINE

23、 BUFFER (IC701) D/A CONVERTER (IC971) FPGA (IC1351) ? (?) 3 V REGULATOR (IC1318) USB CODEC (IC661) USB HUB (IC621) AF AMP (IC721) USB HUB CLOCK (6 MHz) (X621) ? (?) DSP CLOCK (12.288 MHz) (X901) EEPROM (IC351) BACKUP BATTERY (FOR THE REAL TIME CLOCK) (BT381) CPU CLOCK (48 MHz) (X301) A/D CONVERTER (

24、IC1001) CLOCK FILTER (FI1221) ? (?) ? (?) D/A CONVERTER (IC991) ? (?) LVDS DRIVER (IC121) DC AMP (IC135) DC AMP (IC791) USB BRIDGE (IC641) ? (?) ADJUSTABLE STEP-DOWN CONVERTER (IC201) ELECTRIC DOUBLE-LAYER CAPACITOR (C243) ADJUSTABLE STEP-DOWN CONVERTER (IC221) DC AMP (IC125) ANALOG SW (IC691) DC AM

25、P (IC972) AF AMP (IC992) 1 MB SRAM (IC1401) ? (?) ? (?) ? (?) 2-2 ? (?) RF UNIT ? UNIT (BOTTOM VIEW) ? (?) 5 V REGULATOR (IC1061) Q1097 to Q1110 Q1091 to Q1095 RF AMP (Q101) YGR AMP (IC1031) 8-bit SHIFT REGISTER (IC1303) 8-bit SHIFT REGISTER (IC1302) ? (?) PRE-AMP (Q1411) ? (?) ? (?) ? (?) ALC PIN D

26、IODES (D1021 and D1041) ALC AMP (IC1501) 8-bit SHIFT REGISTER (IC1301) DC AMP (IC1502) ? (?) ? (?) ? (?) ? (?) ? (?) ? (?) ? (?) 2-3 ? (?) PA UNIT TX POWER AMP (Q132) ? (?) RF AMP (Q101) DC AMP (IC981) 8-bit SHIFT REGISTER (IC751) ? (?) DRIVE AMP (Q121) PRE-DRIVE AMP (Q111) ? (?) TX POWER AMP (Q131)

27、 9 V REGULATOR (IC221) ? (?) ? (?) ? (?) ? (?) ? (?) ? (?) ? (?) CURRENT MONITOR (IC211) ? (?) ? (?) ? (?) 2-4 ? (?) 10 dB ATTENUATOR TUNING CIRCUIT TUNER UNIT POWER DETECTOR (D1201) ? (?) ? (?) SWR DETECTOR (D1505) 8-bit SHIFT REGISTER (IC2821) 8-bit SHIFT REGISTER (IC2811) 8-bit SHIFT REGISTER (IC

28、2831) ? (?) ? (?) ? (?) ? (?) ? (?) ? (?) DC AMP (IC1901) 8-bit SHIFT REGISTER (IC2841) ? (?) IMPEDANCE DETECTOR (D1701) ? (?) ? (?) COMPARATOR (IC1701) PHASE DETECTOR (D1311 and D1312) 3-1 SECTION 3 CIRCUIT DESCRIPTION PA AND TUNER UNITS (Receive circuits) PA AND TUNER UNITS (Transmit circuits) ATT

29、 PRE AMP Q1211 Q1212/Q1213 LPF LPF A HPF A PHASEI PHASE DET SWR DET SWRL ATT IMPI D961,D962 PWR/SWR DET MUTELPF RL801 From the TX circuits TPWRLBUFF D1505 IMP DET D1271 TUNE NET TUNER UNIT IC1701 HF/50 MHz/70 MHz D1311 D1312 PA UNIT fc=76 MHz Q811 D811/D812 IC1701 POWER DET D1201 IC1901 D/A IC1331 D

30、/A PIN D1251 D1231 ATT AF AMP AF AMP A/D AMPBUFF LPF AAF AF AMP RF Q746 L731,L732 C731C735 SW SP1 J101 J1302 1 2 3 4 5 6 7 8 9 10 11 12 13 D/A IC902 FLASH MEMORY LPF LVDS DRIVE IC1212 BPF XTAL AMP IC1221 MAIN DSP CPU IC901 HSK0/HSK1/DRESD/FRWT IC301 MAIN UNIT RF UNIT DSPCK/DSPR/FRM/BCLK FPGA IC1351

31、41.344 MHz (41.344 MHz) Q1202 Q1201 DACLK X1201 IC1211 IC721 IC992 IC992 SCPCK/SCPR/SCPX/SCPSS 5.BAND 10.FSKK 3.HSEND 13.SQLS 4.START 7.NC 11.MOD 1.8V 2.GND 9.KEY 6.ALC ACC 12.AF 8.14V FPDX/FPSR/FPSX EXT-SPSP DR_AF/DR_RSV/DX_REC/DX_FMT IC991 D/A AGCV IC971 124.033 MHz /FPCAL/BCLK/FRM/MCLK FPX_AGC/FP

32、X_DET/FPR_MOD SPCS/SPCK/ SPDO/SPDI AFO J1 1 2 3 4 5 6 7 8 J1 DISPLAY UNIT FRONT UNIT GND MIC U/D MIC +8V SQL PTT MICE PHONE UNIT MIC UNIT AF OUT 3-1 PA UNIT The PA UNIT is composed of the transmit power amplifier, harmonic filters, and sensing circuits for the transmit power and SWR. (1) RECEIVE SIG

33、NAL PROCESSING The received signal from the TUNER UNIT is passed through the TX/RX SW (RL801), and applied to the RF UNIT through the LPF whose cut-off frequency is 76 MHz, and the TX mute switch (Q811, D811 and D812). To prevent abnormal oscillations caused by feedback of the transmit signal, the T

34、X mute switch connects the transmit line to ground while receiving. (2) TRANSMIT SIGNAL PROCESSING DRIVE AMPLIFIER The transmit signal from the RF UNIT is sequentially ampli- fied by the RF amplifier (Q101), pre-drive amplifier (Q111) and drive amplifier (Q121). These RF amplifiers are the high gain

35、 source-grounded amplifiers. The idling current of drive amplifier (Q121) is appropriately adjusted to compensate for variation in gain. POWER AMPLIFIER The transmit signal from the drive amplifier (Q121) is applied to the push-pull power amplifier (Q131 and Q132) to be ampli- fied up to 100 watts (

36、for the HF/50 MHz band) or 50 watts (for the 70 MHz band). The idling current of the power amplifier is appropriately adjusted to compensate for variation in gain. LPF The transmit signal from the power amplifier is filtered by one of the LPFs that is selected according to the transmit frequency. Th

37、ese LPFs are the Chebyshev filters with sharp cut-off characteristics, to reduce the harmonic components in the transmit signal. There are 7 BPFs with different cut-off frequencies. The LPFs are selected by the relays on both sides of each LPF, accord- ing the transmit frequency. FORWARD AND REFLECT

38、 WAVES DETECTION CIRCUIT The transmit signal is passed through the SWR detection cir- cuit, which is composed of the CM coupler and rectifier diodes (D961 and D962). The forward and reflect waves are detected, resulting in the forward wave and reflect wave sensing volt- ages. The sensing voltages ar

39、e amplified by the buffer (IC981), and then applied to the CPU in the MAIN UNIT for monitoring. The amplified transmit signal is applied to the antenna, through the TUNER UNIT. LPF LPF DRIVE AMP LPF PWR AMP Q131 Q132 LPF DRIVE PRE LPF LPF LPF RF AMP D961,D962 PWR/SWR DET RL801 To the RX circuit BPF

40、BPF BPF BPF BPF BPF BPF BPF LPF BPF BPF BPF BPF 0.03-1.59 MHz 14.35-21.45 MHz 0.03-2.0 MHz 2.0-4.0 MHz PA UNIT 21.45-33.0 MHz 33.0-76 MHz Q111 7.3-14.35 MHz Q121 4.0-7.3 MHz Q101 1.60-74.80 MHz D1051 D1052 22.00-29.99 MHz 50.00-54.00 MHz(TX) 30.00-49.99 MHz 54.01-69.99 MHz 70.00-72.00 MHz(TX) 15.00-

41、21.99 MHz 2.00-2.99 MHz 4.50-6.49 MHz 10.00-14.99 MHz 3.00-4.49 MHz 8.00-9.99 MHz 6.50-7.99 MHz 1.60-30.00 MHz AMOD A/D MIC AMP LPF MICI A/D IC1001 RF UNIT IC1003IC1002 IC1002 D/A IC1331 L1281,L1282 C1281,C1283,C1285 PIN D1251 D1232 ATT A/D AMPBUFF RF J1302 1 2 3 4 5 6 7 8 9 10 11 12 13 LPF LVDS DRI

42、VE IC1212 BPF XTAL AMP IC1221 MAIN UNIT FPGA IC1351 41.344 MHz (41.344 MHz) Q1202 Q1201 DACLK X1201 IC1211 5.BAND 10.FSKK 3.HSEND 13.SQLS 4.START 7.NC 11.MOD 1.8V 2.GND 9.KEY 6.ALC ACC 12.AF 8.14V 124.032 MHz /FPCAL/BCLK/FRM/MCLK FPX_AGC/FPX_DET/FPR_MOD J1 1 2 3 4 5 6 7 8 DISPLAY UNIT GND MIC U/D MI

43、C +8V SQL PTT MICE MIC UNIT AF OUT PHASEI PHASE DET SWR DET SWRL ATT IMPI SW11SW11 TPWRLBUFF D1505 IMP DET D1271 TUNE NET TUNER UNIT IC1701 HF/ 50 MHz/ 70 MHz D1311 D1312 IC1701 POWER DET D1201 IC1901 IF-DSP IC901 TX signal RX signal 3-2 RF UNIT (Receive circuits) ATT PRE AMP Q1211 Q1212/Q1213 LPF L

44、PF A HPF A RF HPF MUTE BPF BPF BPF BPF BPF BPF BPF BPF LPF BPF BPF BPF BPF 0.03-1.59 MHz 1.60-74.80 MHz To the TX AMP D1081D1083 D1001 50.00-54.00 MHz 22.00-29.99 MHz 30.00-49.99 MHz 54.01-69.99 MHz 70.00-74.80 MHz 15.00-21.99 MHz 2.00-2.99 MHz 4.50-6.49 MHz 10.00-14.99 MHz 3.00-4.49 MHz 1.60-1.99 M

45、Hz 8.00-9.99 MHz 6.50-7.99 MHz 1.60-30.00 MHz RF UNIT 3-2 RF UNIT The RF UNIT is composed of the receive and transmit RF circuits. The received signal from the PA UNIT is passed to the MAIN UNIT through the attenuator, fi lter, and preamp. The transmit signal from the MAIN UNIT is passed to the PA UNIT through the fi lter, ALC circuit, and YGR AMP. (1) RECEIVE SIGNAL PROCESSING The received signal fro