Icom_IC-M700Pro_serv_2007.pdf

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1、S-14410XZ-C1 June. 2007 SSB RADIO TELEPHONE iC-m700pro This service manual describes the latest service information for the IC-M700PRO SSB RADIO TELEPHON at the time of publication. NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than specified. This will ruin th

2、e 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 qual

3、ity, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. MODELVERSIONALARM UNIT IC-M700PRO GEN-1N/A GEN-2Yes GEN-21N/A GEN-22Yes GEN-24N/A GEN-25Yes CHNN/A Be sure to include the following four points when ordering replacement parts: 1. 10-dig

4、it Icom parts numbers 2. Component name 3. Equipment model name and unit name 4. Quantity required 1110003491 S.IC TA31136FNG IC-M700PRO MAIN UNIT 5 pieces 8820001210 Screw 2438 screw IC-M700PRO Top cover 10 pieces Addresses are provided on the inside back cover for your convenience. Icom, Icom Inc.

5、 and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries. ORDERING PARTS 1. Make sure the problem is internal before disassembling the transceiver. 2. DO NOT open the transceiver until the transce

6、iver 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 used for all adjustments. 5. DO NOT keep power ON for a long time when the transceiver is defe

7、ctive. 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 using such test equipment. 8. READ the instructions of test equipment throughly before connecti

8、ng a test equipment to the transceiver. REPAIR NOTES INTRODUCTIONCAUTION CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 CIRCUIT DESCRIPTION 3 - 1 RECEIVER CIRCUITS .3 - 1 3 - 2 TRANSMITTER CIRCUITS .3 - 3 3 - 3 PLL CIRCUIT .3 - 5 3 - 4 PORT ALLOCATIONS .3 - 6 SECTION 4 ADJUSTMENT

9、 PROCEDURES 4 - 1 PREPARATION .4 - 1 4 - 2 PLL ADJUSTMENT .4 - 2 4 - 3 TRANSMITTER ADJUSTMENTS .4 - 4 4 - 4 RECEIVER ADJUSTMENTS .4 - 8 SECTION 5 PARTS LIST SECTION 6 MECHANICAL PARTS AND DISASSEMBLY SECTION 7 SEMICONDUCTOR INFORMATION SECTION 8 BOARD LAYOUTS 8 - 1 PLL UNIT .8 - 1 8 - 2 MAIN UNIT .8

10、 - 2 8 - 3 LOGIC-J UNIT, ALARM AND PA150W BOARDS .8 - 3 8 - 4 MIC-J, VR1/2-J, SENSOR1/2, FILTER-J AND TERMINAL-J BOARDS .8 - 4 SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM LOGIC-J UNIT, VR1/2-J, SENSOR1/2-J AND MIC-J BOARDS .10 - 1 MAIN UNIT .10 - 2 PLL UNIT .10 - 5 PA150W, FILTER-J, TERMINAL-

11、J BOARDS .10 - 6 1 - 1 SECTION 1 SPECIFICATIONS M GENERAL Frequency coverage : Receive 500 kHz29.9999 MHz Transmit 1.60002.9999 MHz 4.00004.9999 MHz 6.00006.9999 MHz 8.00008.9999 MHz 12.000013.9999 MHz 16.000017.9999 MHz 18.000019.9999 MHz 22.000022.9999 MHz 25.000027.50000 MHz Mode : J3E (USB), H3E

12、 (AM), J2B (AFSK), F1B (FSK), R3E, A1A (CW) (Available modes differ with version) Number of channels : 150 channels (max.)3 groups of 50 channels each Antenna impedance : 50 (nominal) Usable temperature range : 30C to +60C; 22F to +140F Frequency stability : 10 Hz (30C to +60C; 22F to +140F) (20 Hz

13、above 15 MHz) Power supply requirement : 13.6 V DC 15% Negative ground Current drain (at 13.6 V DC) : Transmit (max. output power) 30 A Receive (max. audio output) 2.5 A Dimensions (projections not included) : 291.4(W)116.4(H)315(D) mm; 111532(W)41932(H)121332(D) in Weight (with ant., battery case a

14、nd cells) : 7.9 kg; 17 lb 7 oz Remote connector : NMEA D-sub 9-pin (female) ACC 1 connector : DIN 8-pin (female) ACC 2 connector : DIN 7-pin (female) M TRANSMITTER Output power (at 13.6 V DC) : 150, 60, 20 W PEP (60, 20 W PEP only above 24 MHz) Spurious emissions : 75 dB typical Carrier suppressions

15、 : 65 dB typical Unwanted sideband suppression : 75 dB typical Microphone impedance : 600 M RECEIVER Sensitivity : J3E, R3E, J2B, A1A 0.35 V typical (1.800029.9999 MHz) (for 12dB SINAD) 1.0 V (1.60001.7999 MHz) 6.3 V (0.50001.5999 MHz) H3E (for 10dB S/N) 2.2 V typical (1.800029.9999 MHz) 6.3 V (1.60

16、001.7999 MHz) 32 V (0.50001.5999 MHz) Spurious response rejection : 80 dB (1.600029.9999 MHz) Audio output power : 5.0 W typical (at 10% distortion with a 4 load) Audio impeadance : 4 to 8 Clarity variable range : 150 Hz All stated specifications are subject to change without notice or obligation. 2

17、 - 1 SECTION 2 INSIDE VIEWS PA150W, FILTER AND TERMINAL BOARDS TERMINAL board Fuse (F7001) Drive amplifiers (Q4001, Q4002: 2SC3133) Thermal switches S4001: OHD-3 110M S4002: OHD-3 50M Power amplifiers (Q4003, Q4004: 2SC2904) PA150W board REG board EUR-21, EUR-22 only FILTER board Power detector circ

18、uit MAIN, PLL AND LOGIC UNITS RF filter circuit Noise blanker circuit 2nd mixer circuit 1st IF amplifier (Q8: 3SK131) 1st IF filter (FI1: FL-120) PLL IC (IC3005: LC7153M) DDS IC (IC3001: SC-1246A) PLL/-A unit ALARM board except GEN-21 MAIN unit Squelch circuit Demodulator circuit (IC10: NJM1496V) BF

19、O DDS IC (IC3002: SC-1287) Reference oscillator (X3001: CR-282) GEN-21, GEN-22, EUR-21 only LOGIC unit 3 - 1 SECTION 3 CIRCUIT DESCRIPTION 3-1 RECEIVER CIRCUITS 3-1-1 RF FILTER CIRCUIT (MAIN UNIT) Received signals from the antenna connector pass through the transmit/receive switching relay (FILTER b

20、oard RL4317) and are then applied to the MAIN unit via J2. The signals pass through the protection relay (RL2), 1.6 MHz cut off high-pass filter (L2L4, C4C8, C629) and are then applied to one of nine bandpass filters (including one low-pass filter for below 2.0 MHz). These filters are selected by th

21、e filter control signals (B0B8) as described in the table below. The filtered signals pass through the 30 MHz cut-off low- pass filter (L71, L72, C130C134, C618), and are then applied to the 1st mixer circuit (Q6, Q7). RF FILTERS USED 3-1-2 1ST MIXER AND IF CIRCUITS (MAIN UNIT) The 1st mixer circuit

22、 converts the received signals into a fixed frequency, 69.0115 MHz 1st IF signal using the PLL output frequency. By changing the PLL frequency, only the desired frequency is picked up at the pair of crystal filters (FI1a, FI1b) at the next stage. The IF amplifier (Q8) and resonator circuits are desi

23、gned between the filter pair. The PLL output signal (1LO) enters the MAIN unit via J3 and is amplified at the 1st LO ampli- fier (Q5) and then applied to the 1st mixer (Q6, Q7) 3-1-3 2ND MIXER AND IF CIRCUITS (MAIN UNIT) The 1st IF signal from the crystal filter (FI1b) is converted again into a 9.01

24、15 MHz 2nd IF signal at the 2nd mixer circuit (D52, L66, L67). The 60 MHz 2nd local signal (2LO) from the PLL unit enters the MAIN unit via J4 to be applied to the 2nd mixer. The 2nd IF signal is passed through the noise blanker gate (D15, D16) and amplified at the 2nd IF amplifier (Q16) and then ap

25、plied to one of the 9 MHz IF filters as described below. The passed signal is amplified at the two stage 2nd IF amplifiers (Q32, Q33) and is applied to a demodulator circuit (D39 for H3E or IC10 for J3E and others). 2ND IF FILTERS USED 3-1-4 NOISE BLANKER CIRCUIT (MAIN UNIT) The noise blanker circui

26、t cuts off the IF circuit line at the moment of receiving a pulse-type noise. A portion of the 2nd IF signal between resonator circuits (L83, L84 after stage of the 2nd mixer, D52) is amplified at the noise amplifiers (Q9, IC8, Q11). The signal is then detected at the noise detector (D17) to convert

27、 the noise components to DC voltages. The signals are then applied to the noise blanker switch (Q13, Q14). At the moment the detected voltage exceeds the Q13s threshold level, Q14 outputs a blanking signal to close the noise blanker gate (D15, D16) by applying reverse-biased voltage. Q15 turns the n

28、oise blanker circuit ON and OFF. LPF or BPF 0.529.999 MHz 1st mixer Q6, Q7 1st LO: 69.511599.0115 MHz Fl1a/Fl1b Crystal filter Crystal filter 69.0115 MHz 2nd mixer D52 2nd LO: 60.0 MHz Fl2 or Fl3/Fl4 9.0115 MHz Other modes H3E Detector D39 Demodulator IC10 Audio output BFO J3E, J2B, R3E, FSK: FSK na

29、rrow, J2B narrow: A1A: 9.013 MHz 9.0123 MHz 9.0116 MHz Frequency (MHz) 0.51.999 22.999 34.999 56.999 79.999 Frequency (MHz) 1013.999 1417.999 1823.999 2429.999 Control signal B5 B6 B7 B8 Control signal B0 B1 B2 B3 B4 Entrance coil L49 L8 L13 L18 L23 Entrance coil L28 L33 L38 L43 MODE J3E, R3E, FSK H

30、3E FSK narrow, A1A narrow Used filter FI2 FI3/FI4 Optional narrow filter* Control signal SEL8: low, H3E8: low SEL8: low, H3E8: high SEL8: high, H3E8: low RECEIVE FREQUENCY CONSTRUCTION *Built-in to the GMDSS versions 3 - 2 The detected voltage is also applied to the noise blanker AGC circuit (Q12, Q

31、10) and is then fed back to the noise amplifier (IC8) as a bias voltage. The noise AGC circuit prevents closure of the noise blanker gate for long periods by non-pulse-type noise. The time constant of the noise blanker AGC circuit is determined by R58 and C114. 3-1-5 DEMODULATOR CIRCUIT (MAN UNIT) T

32、his circuit mixes the 2nd IF and BFO signals to pick up the AF components (except H3E mode). The 2nd IF signal from the 2nd IF amplifier (Q33) is applied to the balanced mixer (IC10, pin 1). The 9.01169.0130 MHz BFO signal from the PLL unit is also applied to IC10 (pin 10). AF sig- nals are output f

33、rom pin 12 and are then applied to the AF circuits. 3-1-6 H3E DETECTOR CIRCUIT (MAIN UNIT) The 2nd IF signal from the 2nd IF amplifier (Q33) is applied to the AM detector circuit (D39) to be demodulated into AF signals. The detected signals are amplified at the buffer amplifier (Q45), and are then a

34、pplied to the AF circuits. 3-1-7 AGC CIRCUIT (MAIN UNIT) The AGC (Automatic Gain Control) circuit reduces IF ampli- fier gain to prevent the receiver circuit from distorting and to keep the audio output at a constant level. A portion of the IF signals from the 2nd IF amplifier (Q33) is detected at t

35、he AGC detector circuit (D31) and is then applied to the AGC amplifier (Q41) to control the AGC time constant line. The reference voltage of the AGC line is con- trolled by the “RFG” line which comes from the CPU for the RF gain setting. When receiving a strong signal, the detected voltage increases

36、 and the voltage of the AGC line is decreased by the AGC amplifier (Q41) via the 5 V voltage line. The AGC line is used for the bias voltage of the IF amplifiers (Q8, Q16, Q32, Q33), so that these amplifiers reduce gain. When the strong signal disappears, the AGC line voltage is released by C245/R26

37、8 and C670/R813. The AGC switch (Q42, D38) turns the AGC circuit OFF when the AGC OFF function activates. The AGC-fast switch (Q131) sets the AGC line as fast-release during scanning, A1A mode selection and DSC operation. 3-1-8 S-METER CIRCUIT (MAIN UNIT) The S-meter indicates the AGC level on the d

38、isplay, since the AGC level varies with the received signal strength. The AGC bias voltage (AGC time constant line) from the AGC amplifier (Q41) is inverted and amplified at the meter amplifier (IC19b). The amplified signal is applied to the CPU via the “RSM” line. 3-1-9 AF AMPLIFIER CIRCUITS (MAIN

39、UNIT AND LOGIC BOARD) AF signals from the demodulator or H3E detector circuits pass through the active low-pass filter (IC20b) and squelch gate (IC12a), and are then applied to the electronic volume control (IC36). The CPU (IC132, pin 37) outputs the volume control signal (1 to 5 V) according to the

40、 VOLUME control setting. The AF output signal from IC36 (9 pin) are supplied to the LOGIC unit via J23. The signals are amplified at the AF power amplifier (IC2007) and are then applied to the internal speaker via microphone connector (pins 3, 4) and external SP jack via the MAIN unit. The speaker s

41、witch relay (RL2001) is connected to the () terminal of internal speaker for the SPEAKER switch func- tion. 3-1-10 SQUELCH CIRCUIT (MAIN UNIT) The transceiver has two squelch circuits, voice activated squelch for J3E/H3E and S-meter squelch for A1A/F1B/ J2B. (1) AF ACTIVATED SQUELCH A portion of the

42、 AF signal from the active low-pass filter (IC20b) is amplified at the limiter amplifier (IC20a) and is then applied to the one-shot multi-vibrator (IC22c, IC22d). The one shot multi-vibrator functions as an F-V converter which generates a signal only when audio signals are received. The output sign

43、als pass through the NOR gate (IC22b) and then the 3 Hz low-pass filter (IC21a) to remove the remain- ing noise components. The filtered signal is applied to the window comparator (IC21b). The NOR gate (IC22b) deac- tivates the audio activated squelch during A1A/F1B/J2B mode operation. 1st IF signal Q8D52Q16 2nd IF filters Q32Q33 H3E derector Demodulator 8 V CW, DSC, SCAN Q131 C670 R813 C245 C268 AGC time constant