icom_ic-7851_ic-7850_transceiver_sm.pdf

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1、S-15119XZ-C1 March 2015 THE TRANSCEIVER This service manual describes the latest technical informa- tion for the IC-7850/IC-7851 THE TRANSCEIVER, at the time of publication. ONLY connect the transceiver to an AC outlet that is 85 to 265 V. DO NOT expose the transceiver to rain, snow or liquids. DO N

2、OT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the transceivers front-end. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. MODELVERSION VERSION NUMBER IC-7851 USA#02 EUR#0

3、3 FRA#04 UK#05 ITR#06 ESP#07 KOR#08 IC-7850 USA-01#22 EUR-01#23 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. Quantity required 1110003491 S.IC TA31136FNG IC-7851 MAIN UNIT 5 piece

4、s 8820001210 Screw 2438 screw IC-7851 Top cover 10 pieces Addresses are provided 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 fro

5、m 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 when the trans- ceiver is defective. 6. DO NOT trans

6、mit power into a Standard Signal Generator or a Sweep Generator, otherwise 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

7、thoroughly before connecting it to the transceiver. REPAIR NOTES INTRODUCTIONCAUTION (IC-7851) 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, and/or other countries. TABLE OF CO

8、NTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 ADJUSTMENT PROCEDURES 3-1 PREPARATION . 3-1 3-2 FINAL AND DRIVER IDLING CURRENT ADJUSTMENTS. 3-5 3-3 PRESET ADJUSTMENTS . 3-7 3-4 REF ADJUSTMENTS . 3-8 3-5 ID ADJUSTMENTS . 3-9 3-6 TX ADJUSTMENTS . 3-10 3-7 RX ADJUSTMENTS . 3-14 3-8 SC

9、OPE ADJUSTMENT . 3-21 3-9 TUNER ADJUSTMENT . 3-21 SECTION 4 PARTS LIST SECTION 5 MECHANICAL PARTS SECTION 6 BOARD LAYOUTS SECTION 7 BLOCK DIAGRAM SECTION 8 VOLTAGE DIAGRAM 1-1 SECTION 1. SPECIFICATIONS Specifications D General Frequency coverage (unit: MHz): Receiver 0.03000060.000000*1 Transmitter

10、0.1357000.137800*2, 1.8000001.999999*2, 3.5000003.999999*2, 5.255000 5.405000*1, *2, 7.0000007.300000*2, 10.10000010.150000*2, 14.00000014.350000*2, 18.06800018.168000*2, 21.00000021.450000*2, 24.89000024.990000*2, 28.00000029.700000*2, 50.00000054.000000*2 *1Some frequency ranges are not guaranteed

11、. *2Depending on versions. Operating mode: USB/LSB (J3E), CW (A1A), RTTY (F1B), PSK31/63 (G1B), AM (A3E), FM (F3E) Number of memory channels: 101 (99 regular, 2 scan edges) Antenna connectors: SO-2394 (antenna impedance: 50 ) Operating temperature range: 0C to +50C, +32F to +122F Frequency stability

12、: Less than 0.05 ppm (approximately 5 minutes after turning ON the main power, I/O, ON, 050C (32122F), 54.000000 MHz) Frequency resolution: 1 Hz (minimum) Power supply requirement: 85265 V AC (universal input) Power consumption: Power OFF Standby 15 VA typical (at 100 V AC) Remote Standby 20 VA typi

13、cal (at 100 V AC) Receive Standby 150 VA typical Maximum audio 150 VA typical Transmit at 200 W 800 VA Dimensions (projections not included): 425 (W)149 (H)435 (D) mm, 16.7 (W)5.9 (H)17.1 (D) in Weight: Approximately 23.5 kg, 52 lb ACC 1 connectors: 8-pin DIN connector2 ACC 2 connectors: 7-pin DIN c

14、onnector2 EXT-DISPLAY connector: DVI-I CI-V connector: 2-conductor 3.5 (d) mm (18) KEYBOARD connector: USB-A D Transmitter Transmit output power: SSB, CW, RTTY, PSK, FM Less than 5200 W AM Less than 550 W 137 kHz band More than 20 dBm (Europe version only) Modulation system: SSB P.S.N. modulation AM

15、 Low power modulation FM Phase modulation Spurious emission: Harmonics More than 60 dB (HF bands) More than 70 dB (50 MHz band) Spurious (except harmonics) More than 50 dB (HF bands) More than 70 dB (50 MHz band) Out of band emission More than 40 dB (HF bands) More than 60 dB (50 MHz band) Carrier s

16、uppression: More than 63 dB Unwanted side-band suppression: More than 70 dB TX variable range: 9.999 kHz Microphone connector: 8-pin connector (600 ) ELEC-KEY connector: 3-conductor 6.35 (d) mm (14) KEY connector: 3-conductor 6.35 (d) mm (14) RELAY connector: Phono (RCA) ALC connector: Phono (RCA) 1

17、-2 D Receiver Receive system: Double conversion superheterodyne system Intermediate frequencies: 1st 64.455 MHz (MAIN band) 64.555 MHz (SUB band) 2nd 36 kHz Sensitivity: SSB, CW, RTTY, PSK (BW=2.4 kHz, 10 dB S/N) 0.1001.799 MHz 0.5 V (pre-amp 1 ON) 1.80029.990 MHz 0.16 V (pre-amp 1 ON) 50.00054.000

18、MHz 0.13 V (pre-amp 2 ON) AM (BW=6 kHz, 10 dB S/N) 0.1001.799 MHz 6.3 V (pre-amp 1 ON) 1.80029.990 MHz 2 V (pre-amp 1 ON) 50.00054.000 MHz 1 V (pre-amp 2 ON) FM (BW=15 kHz, 12 dB SINAD) 28.00029.990 MHz 0.5 V (pre-amp 1 ON) 50.00054.000 MHz 0.32 V (pre-amp 2 ON) Selectivity (with optimum roofi ng fi

19、 lter): SSB, RTTY (BW=2.4 kHz) More than 2.4 kHz/3 dB Less than 3.6 kHz/60 dB CW/RTTY/PSK (BW=500 Hz) More than 500 Hz/3 dB Less than 700 Hz/60 dB AM (BW=6 kHz) More than 6.0 kHz/3 dB Less than 15.0 kHz/60 dB FM (BW=15 kHz) More than 12.0 kHz/6 dB Less than 20.0 kHz/60 dB Spurious and image rejectio

20、n ratio: More than 70 dB Squelch sensitivity (pre-amp OFF): SSB, CW, RTTY, PSK31/63 Less than 5.6 V FM Less than 1 V RIT variable range: 9.999 kHz Audio output power: More than 2.6 W at 10% distortion with an 8 load PHONES connector: 3-conductor 6.35 (d) mm (14) EXT-SP connectors: 2-conductor 3.5 (d

21、) mm (18)/8 2 (for main and sub) D Antenna tuner Matching impedance range: 16.7 to 150 unbalanced (HF bands; VSWR better than 3:1) 20 to 125 unbalanced (50 MHz band; VSWR better than 2.5:1) Minimum operating input: 8 W (HF bands) 15 W (50 MHz band) Tuning accuracy: VSWR 1.5:1 or less Insertion loss

22、(after tuning) : Less than 1.0 dB * The LCD display may have cosmetic imperfections that appear as small or dark spots. This is not a malfunction or defect, but a normal characteristic of LCD displays. Spurious signals may be received near the following frequencies. These are made in the internal ci

23、rcuit and does not indicate a transceiver malfunction. 0.150 MHz, 1.049 MHz, 19.660 MHz and 24.576 MHz Spurious waveforms may be displayed on the spectrum scope screen regardless of the transceivers condition (Tx or Rx). They are made in the scope circuit. This does not indicate a transceiver malfun

24、ction. All stated specifi cations are typical and subject to change without notice or obligation. 2-1 SECTION 2. INSIDE VIEWS DSP UNIT MAIN UNIT LOGIC UNIT SCOPE UNIT PA200W UNIT NETWORK UNIT PBT2 UNIT OSC UNIT TENKEY UNIT VR-E UNIT DISPLAY UNIT SD UNIT VR-D UNIT VR-C UNIT MIC UNIT SW-A UNIT JACK UN

25、IT LED UNIT PBT1 UNIT SW-C UNIT FILTER UNIT ANT-SW UNIT CONNECT UNIT DIGISEL-B UNIT RF-B UNIT RF-A UNIT DIGISEL-A UNIT FRONT PANEL REAR PANEL FRONT PANEL REAR PANEL UNIT LOCATION (Bottom side) UNIT LOCATION (Top side) 2-2 DISPLAY UNIT MULTIPLEXER (IC203) MULTIPLEXER (IC202) D/A CONVERTER (IC261) FRO

26、NT CPU (IC301) LCD DIMMER CONTROLLER (Q403) LCD DIMMER CONTROLLER (Q401) MULTIPLEXER (IC201) MULTIPLEXER (IC205) RESET IC (IC271) SERIAL-TO-PARALLEL CONVERTER (IC207) FRONT CPU CLOCK (X301) LCD BRIGHTNESS CONTROLLER (IC411) HIGH ACCURACY VOLTAGE DETECTOR (IC251) S/P CONVERTER (IC206) MULTIPLEXER (IC

27、204) LCD DIMMER CONTROLLER (IC421) 2-3 LOGIC UNIT EEPROM (IC5021) PULSE TRANSFORMER (T5041) GDC (IC4001) DDR2 SDRAM (IC3151) DDR2 SDRAM (IC3101) FLASH ROM (IC3251) FLASH ROM (IC3201) BUFF (IC1041) VIDEO SIGNAL D/A CONVERTER (IC4201) DC-DC CONVERTER (IC2301) DC-DC CONVERTER (IC2201) DC-DC CONVERTER (

28、IC2351) COOLING FAN CURRENT DETECTOR (IC1021) DC-DC CONVERTER (IC2241) EEPROM WITH PATCH FILE (IC6065) SD CARD CONTROLLER (IC3601) RAM (IC3301) SDRAM (IC4151) SDRAM (IC4101) MAIN CPU (1) (IC3001) MAIN CPU (2) (IC6001) DC-DC CONVERTER (IC2221) 1/4 FREQUENCY DIVIDER (IC2161) DC-DC CONVERTER (IC2241) D

29、C-DC CONVERTER (IC2121) DC-DC CONVERTER (IC2101) DIV VIDEO PROCESSOR (IC4251) FPGA (IC3401) 2-4 DSP UNIT LEVEL CONVERTER (IC181) DC-DC CONVERTER (IC171) DSP (IC401) FLASH MEMORY (IC451) DSP (IC301) DC-DC CONVERTER (IC151) FLIP-FLOP LOGIC GATE (IC201) TRIPLE BUFFER GATE (IC186) FLASH MEMORY (IC351) 2

30、-5 1st IF FILTERS Band-pass filters RF-A/-B UNIT 2nd MIXER (IC3402) DRIVER (IC3351) SERIAL-TO-PARALLEL CONVERTER (IC1902) SERIAL-TO-PARALLEL CONVERTER (IC1905) 1st MIXER (IC2102) 1st LO AMP (Q2203) ROOFING FILTER 2nd LO AMP (IC3802) +5 V REGULATOR (IC3851) 2nd MIXER (IC3401) SERIAL-TO-PARALLEL CONVE

31、RTER (IC1901) 1st LO AMP (Q2204) TRI-STATE LOGIC GATE (IC1904) 2-6 SCOPE UNIT SDRAM (IC571) +3.3 V REGULATOR (IC36) PLL IC (IC401) IF AMP (Q91) +5 V REGULATOR (IC31) DEMULTIPLEXER (IC581) BUFFER (IC603) +1.2 V REGULATOR (IC503) DSP (IC501) FLASH MEMORY (IC502) IF AMP (IC311) PLL IC (IC101) RF SW (IC

32、212) BROADBAND MMIC AMP (IC481) BROADBAND MMIC AMP (IC171) 2nd IF FILTER (BW=10 kHz) (FI212) BUFFER (IC604) BUFFER (IC602) 2nd IF FILTER (BW=25 kHz) (FI211) A/D CONVERTER (IC601) 2-7 PA200W UNIT PWR AMP (Q401) PRE-DRIVE AMP (Q201) YGR AMP (Q101) PWR AMP (Q402) TX/RX CONTROLLER (Q1) DC AMP (IC601) DR

33、IVE AMP (Q301) +8 V REGULATOR (IC2) POWER AMP CURRENT DETECTOR (IC502) DRIVER AMP CURRENT DETECTOR (IC501) THERMISTOR (R3) TX/RX CONTROLLER (Q2) CTRL UNIT RELAY CTRL (IC403) RELAY CTRL (IC402) TUNER CPU (IC1) FLASH MEMORY (IC2) RELAY CTRL (IC55) RELAY CTRL (IC56) MOTOR DRIVERS (Q3 to Q10) FLIP-FLOP

34、LOGIC GATE (IC156) DC AMP (IC101) COMPARATOR (?) 2-8 3-1 SECTION 3. ADJUSTMENT PROCEDURE M REQUIRED EQUIPMENT 3-1 PREPARATION EQUIPMENTSPECIFICATIONEQUIPMENTSPECIFICATION RF power (terminated type) Measuring range : 10300 W Frequency range : 1.860 MHz Impedance : 50 SWR : Less than 1.2 : 1 Standard

35、Signal Generator (SSG) Frequency range : 0.1100 MHz Output level : 20 dB to 90 dB (127 to 17 dBm) Frequency Counter Frequency range : 0.1100 MHz Frequency accuracy : 0.5 ppm or better Input level : Less than 1 mW AC MillivoltmeterMeasuring range : 10 mV to 10 V Digital multimeter Input impedance : 5

36、0 k/DC or more Measuring range : Voltage: 0.130V Current: 5A/30A External Speaker Input impedance : 8 Capacity : More than 5 W Audio Generator Frequency range : 3003000 Hz Output level : 1500 mV Attenuator Power attenuation : 50 or 60 dB Capacity : More than 200 W RF-A UNITRF-A UNITRF-B UNIT RF-A UN

37、ITRF-A UNITRF-A UNIT MAIN UNITMAIN UNITMAIN UNIT RF-A/-B UNIT cover Bottom cover M REMOVING COVERS 3-2 M UNITS LOCATION M CONNECTION RF-B UNITRF-A UNIT MAIN UNIT L B AC millivolt meter Speaker (8 ) 3.5 mm (1/8 ) monoral plug + + Short plug: (Short) 3.5 mm (1/8 ) monoral plug RF power meter SSGCAUTIO

38、N ! DO NOT select an TX adjustment item while an SSG is connected to the antenna connector. Audio generator PTT MIC AC millvolt meter Digital multimeterFrequency counter 100 dummy load (SWR=2) 3-3 While holding down, turn ON the power. CAUTION: When a TX adjustment item is selected, the transceiver

39、automatically transmits. Adjusts the value for the item. Adjustment presets (page 4-17) Enters to the ID adjustment (page 4-15) Reference signal adjustment (page 4-17) Transmitter adjustment (page 4-13) Receiver adjustment (page 4-15) Scope adjustment (page 4-15) Stores the adjustment value. M ENTER

40、ING THE ADJUSTMENT MODE 1) Insert the short pin to the REMOTE jack. 2) While holding down the SSB and CW keys, turn ON the power. M QUITTING THE ADJUSTMENT MODE 1) Remove the short pin from the REMOTE jack. 2) Turn OFF the power, and then turn ON the power again. M MAIN ADJUSTMENT MENU 3-4 Adjusts S

41、elects the previous adjustment item jp Return to main adjustment menu Stores the adjustment value Adjustment item name Selects the next adjustment item Adjustment value M ADJUSTMENT SCREEN EXAMPLE 3-5 ADJUSTMENTOPERATION ADJUSTMENT ITEM VALUE IDLING CURRENT ADJUSTMENT -PREPARATION- 1 Disconnect W261

42、 (Power cable) from EP501 and EP502 (PA200W UNIT). (See the next page.) -ADJUSTMENT-21) Push F-3 (ID) to enter the ID Adjustment menu. 2) Select the item FINAL ID SET, and then push F-7. “FINAL1 IDV” appears. FINAL ID SETPush F-7. 31) While holding down F-6, turn the main dial to set the adjustment

43、value. 2) While holding down F-6, push F-7. “FINAL2 IDV” appears. FINAL1 IDV “00” 41) While holding down F-6, turn the main dial to set the adjustment value. 2) While holding down F-6, push F-7. FINAL2 IDV “00” 5 Select the item DRIVER ID SET, and then push F-7. “DRIVER IDV” appears. DRIVER ID SET P

44、ush F-7. 61) While holding down F-6, turn the main dial to set the adjustment value. 2) While holding down F-6, push F-7. Returns to the Adjustment menu. DRIVER IDV “00” 71) Turn OFF the power. 2) Connect W261 to EP501 and EP502 (PA200W UNIT). 3-2 FINAL AND DRIVER IDLING CURRENT ADJUSTMENTS (Necessa

45、ry only when the fi nal or drive amplifi er has been replaced.) ID adjustment screen 3-6 REMOVING THE POWER CABLE Power cable W621 3-7 ADJUSTMENTOPERATION ADJUSTMENT ITEM/POINT VALUE EXTERNAL METER -PREPARATION- 1 Push F-1 (PRESET) to enter the Preset menu. -ADJUSTMENT-21) Push F-5 (ID-APC). 2) Turn

46、 the main dial to set the adjustment value to “11.0 A.” 3) Push F-7 (SET). Returns to the preset menu. ID APC REF“11.0 A” (On the screen) 31) Connect a voltmeter to the METER terminal. 2) Push F-1 (Ext Met) to enter the External Meter adjust- ment mode. 41) Turn the main dial to set the output voltage to “0 V.” 2) Push F-7 (SET). EXT-METER A 0 V 51) Turn the main dial to set the output voltage to “0 V.” 2) Push F-7 (SET). EXT-METER B0 V 61) Push F-3 (EXIT). Returns to the External Meter adjustment mode. 2) Push F-6 (EXIT). Returns to