Icom_IC-M802_serv.pdf

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1、MF/HF MARINE TRANSCEIVER iM802 SERVICE MANUAL INTRODUCTION This service manual describes the latest service information for the IC-M802 MF/HF MARINE TRANSCEIVER at the time of publication. DANGER NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 16 V. This wil

2、l ruin the transceiver. DO NOT expose the transceiver to rain, snow or any 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 front end. OR

3、DERING PARTS Be sure to include the following four points when ordering replacement parts: 1. 10-digit order numbers 2. Component part number and name 3. Equipment model name and unit name 4. Quantity required 1110004080 S.ICPC2709TIC-M802 MAIN UNIT5 pieces 8810005770 Screw BiH M38 ZK IC-M802 Top co

4、ver10 pieces Addresses are provided on the inside back cover for your convenience. REPAIR NOTES 1. Make sure a problem is internal before disassembling 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 com

5、ponents.Turn them slowly and smoothly. 4. DO NOT short any circuits or electronic parts. An insu- lated 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 signal generator or a sweep generator. 7.

6、 ALWAYS connect a 50 dB to 60 dB attenuator between the transceiver and a deviation meter or spectrum ana- lyzer when using such test equipment. 8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver. To upgrade quality, any electrical or mechanical part

7、s and internal circuits are subject to change without notice or obligation. MODEL IC-M802 VERSION U.S.A. Canada Other SYMBOL USA CAN OTH TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2INSIDE VIEWS SECTION 3CIRCUIT DESCRIPTION SECTION 4ADJUSTMENT PROCEDURES SECTION 5PARTS LIST SECTION 6MECHANICA

8、L PARTS AND DISASSEMBLY 6 - 1RC-25. 6 - 1 6 - 2SP-24. 6 - 1 6 - 3HM-135 . 6 - 1 6 - 4IC-M802 . 6 - 1 SECTION 7SEMI-CONDUCTOR INFORMATION SECTION 8BOARD LAYOUTS 8 - 1HM-135 8 - 1 - 1SW BOARD . 8 - 1 8 - 1 - 2MAIN BOARD. 8 - 1 8 - 2RC-25 8 - 2 - 1JACK BOARD. 8 - 1 8 - 2 - 2CONNECT BOARD . 8 - 1 8 - 2

9、- 3SENSOR BOARD. 8 - 1 8 - 2 - 4VR BOARD. 8 - 2 8 - 2 - 5DISPLAY BOARD . 8 - 3 8 - 3IC-M802 8 - 3 - 1DSP BOARD.8 - 5 8 - 3 - 2MAIN UNIT. 8 - 7 8 - 3 - 3FILTER BOARD. 8 - 9 8 - 3 - 4PLL UNIT. 8 - 11 8 - 3 - 5PA UNIT. 8 - 12 8 - 3 - 6DRIVER BOARD. 8 - 13 8 - 3 - 7VARISTOR-1 BOARD. 8 - 13 8 - 3 - 8VARI

10、STOR-2 BOARD. 8 - 14 SECTION 9BLOCK DIAGRAM SECTION 10WIRING DIAGRAM SECTION 11VOLTAGE DIAGRAMS 11 - 1RC-25 and HM-135.11 - 1 11 - 2IC-M802 11 - 2 - 1MAIN UNIT (1). 11 - 2 11 - 2 - 2MAIN UNIT (2). 11 - 3 11 - 2 - 3MAIN UNIT (3). 11 - 4 11 - 2 - 4PA UNIT. 11 - 5 11 - 2 - 5PLL UNIT (1). 11 - 6 11 - 2

11、- 6PLL UNIT (2). 11 - 7 11 - 2 - 7DSP BOARD. 11 - 8 11 - 2 - 8FILTER BOARD. 11 - 9 IC-M802 GENERAL Frequency coverage: Mode: TX/RXJ3E (USB/LSB), J2B (AFSK), F1B (FSK), A1A (CW) H3E OTH RXH3E USA, CAN DSCJ2B USA, CAN Antenna impedance: 50 Frequency stability: 10 Hz USA, CAN, 20 Hz OTH Power supply re

12、quirement: 13.6 V DC 15% Negative ground Current drain (at 13.6 V DC): RX; 3.0 A at Max. output power TX; 30 A typical at Max. audio output Usable temperature range: 20C to +55C; 4F to +131F Dimensions (projections not included): 240(W) 94(H) 238.4(D) mm; 2 716(W) 3 1116(H) 9 38(D) in. Weight: 4.7 k

13、g; 10.4 lb; 165.8 oz TRANSMITTER Output power: 150, 60, 20 W PEP Spurious emissions: 62 dB Carrier suppressions: 40 dB Unwanted sideband suppresion: 55 dB Microphone impedance: 600 RECEIVER Sensitivity: (Receiver) (DSC) USA, CAN: 0 dBVe.m.f. (J2B; 2.1875, 4.2075, 6.3120, 8.4145, 12.5770, 16.8045 MHz

14、) Squelch sensitivity: Spurious response rejection: More than 70 dB Clarity variable range: 150 Hz 1 - 1 SECTION 1SPECIFICATIONS MODE J3E, A1A J2B, F1B H3E FREQUENCY 0.51.5999 MHz 1.61.7999 MHz 1.829.9999 MHz 1.61.7999 MHz 1.829.9999 MHz 1.51.5999 MHz 1.61.7999 MHz 1.83.9999 MHz 20 dB SINAD 30 dBVe.

15、m.f. 13 dBVe.m.f. 8 dBVe.m.f. 13 dBVe.m.f. 8 dBVe.m.f. 44 dBVe.m.f. 30 dBVe.m.f. 24 dBVe.m.f. 10 dB S/N 16 dBV 1 dBV 6 dBV 1 dBV 6 dBV 30 dBV 16 dBV 10 dBV MODE J3E at 12.230 MHz H3E at 1.000 MHz Threshold Less than +20 dBV Less than +30 dBV Tight Less than +90 dBV Less than +110 dBV Receive Transmi

16、t DSC receive USA, CAN 500 kHz29.9999 MHz 1.60002.9999 MHz4.00004.9999 MHz 6.00006.9999 MHz8.00008.9999 MHz 12.000013.9999 MHz16.000017.9999 MHz 18.000019.9999 MHz22.000022.9999 MHz 25.000027.5000 MHz 2.1875 MHz, 4.2075 MHz, 6.3120 MHz, 8.4145 MHz, 12.5770 MHz, 16.8045 MHz 1 - 2 RC-25 Remote control

17、ler GENERAL Microphone impedance: 600 Audio output power: More than 5 mW at 16 headphone with 10 % distortion Audio output impedance: 816 Usable temperature range: 20C to +55C; 4F to +131F Dimension (projections not included): 220(W) 110(H) 84.4(D) mm; 8 2132(W) 4 1132(H) 3 516(D) in. Weight: 570 g;

18、 1.3 lb; 20.1 oz SP-24 External speaker GENERAL Impedance: 4 Input power: Rated input;5 W Maximum input;7 W Usable temperature range: 20C to +60C; 4F to +140F Dimension (projections not included): 110(W) 110(H) 84.4(D) mm; 4 1132(H) 4 1132(H) 3 516(D) in. Weight: 370 g; 0.82 lb; 13.1 oz All stated s

19、pecifications are subject to change without notice or obligation. SECTION 2INSIDE VIEWS 2 - 1 RC-25 IC-M802 VR BOVR BOARDARD Reset ICReset IC (IC8202:(IC8202: S-80942ANMP) S-80942ANMP) CPUCPU (IC8201:(IC8201: HD64F2134AF HD64F2134AFA20)A20) LCD unitLCD unit (DS8220:(DS8220: HLC770-018800) HLC770-018

20、800) P Po ow wer amplifierer amplifier (IC8270:(IC8270: T TA7368F)A7368F) DISPLADISPLAY BOY BOARDARD SENSOR BOSENSOR BOARDARD VR BOARD Reset IC (IC8202: S-80942CNMC) CPU (IC8201: HD64F2134AFA20) LCD unit (DS8220: HLC7700-018800) Power amplifier (IC8270: TA7368F) DISPLAY BOARD SENSOR BOARD MAIN UNITM

21、AIN UNIT DSP BODSP BOARDARD CPUCPU (IC3303:(IC3303: M30624MGA) M30624MGA) 2nd mix2nd mixerer (D302:(D302: HSB88WS) HSB88WS) 1st mix1st mixer circuiter circuit 1st IF amplifier1st IF amplifier (Q203:(Q203: 3SK131) 3SK131) MAIN UNIT DSC 1st mixer D2301: HSB88WS USA,CAN only DSC 2nd mixer IC2701: TA410

22、7F USA,CAN only DSP BOARD CPU IC3303: M30624FGAFP USA,CAN M30620FCAFP OTH 2nd mixer (D302: HSB88WS) 1st mixer circuit 1st IF amplifier (Q203: 3SK131) PA UNIT VARISTOR-2 BOARD VARISTOR-1 BOARD FAN controller (IC6501: TS522ID) DRIVER BOARD 3 - 1 SECTION 3CIRCUIT DESCRIPTION 3-1 RECEIVER CIRCUITS 3-1-1

23、 RF FILTER CIRCUIT (FILTER AND MAIN UNITS) Received signals from the antenna connector are applied to the transmit/receive switching and protection relay (FILTER unit; RL7301) which is controlled by the CPU via the “TRXS” line. The signals pass through the 30 MHz cut-off low-pass filter (FILTER unit

24、; L7321, C7321C7323, C7325), and then applied to the MAIN unit via the J7321. The signals pass through the transmit/receive switch (D53) and 1.6 MHz cut off high-pass filter (L51L54, C54, C56, C57, C59, C61C64), and are then applied to one of the bandpass filters (including one low-pass filter for b

25、elow 2.0 MHz). These filters are selected by the filter control signals (B0B8) as described in the table below. The filtered signals pass through the 33 MHz cut-off low- pass filter (L202, L203, C202C206), and are then applied to the 1st mixer circuit (Q201, Q202). 3-1-2 1ST MIXER AND IF CIRCUITS (M

26、AIN UNIT) The 1st mixer circuit converts the received signals into a fixed frequency, 64.445 kHz 1st IF signal using PLL output frequency. By changing the PLL frequency, only the desired frequency is picked up at the pair of crystal filters (FI301a, FI301b) via the 64.445 kHz bandpass filter (FI201)

27、 at the next stage. The IF amplifier (Q203) and resonator circuits are designed between the filter pair. The PLL output signal (1LO) enters the MAIN unit via the J601 and is amplified at the 1st LO amplifier (Q601). The amplified signal is passed through the 100 MHz cut-off low-pass filter (L604, L6

28、05, C604, C606C610) to suppress harmonics components, and then applied to the 1st mixer circuit (Q201, Q202). 3-1-3 2ND MIXER AND IF CIRCUITS (MAIN UNIT) The 1st IF signal from the crystal filter (FI301b) is converted again into a 455 kHz 2nd IF signal at the 2nd mixer circuit (D302, L303, L304). Th

29、e 2nd LO signal (2LO) from the PLL unit enters the MAIN unit via the J301 to be applied to the 2nd mixer circuit. 3-1-4 3RD MIXER AND IF CIRCUITS (MAIN UNIT) The 2nd IF signal passes through the low-pass filter (L305, L306, C307C311), and then applied to the IF amplifier (Q401) via the ceramic bandp

30、ass filter (FI401). The ampli- fied signal passes through the ceramic bandpass filter (FI402), and then applied to the 3rd mixer circuit via the IF amplifier (Q501). The 2nd IF signal is converted into a 12 kHz 3rd IF signal at the 3rd mixer circuit (IC501). The 3rd LO signal (3LO) from the PLL unit

31、 enters the MAIN unit via the J3601 to be applied to the 3rd mixer circuit. 3-1-5 DSP RECEIVER CIRCUIT (MAIN AND DSP UNITS) The DSP (Digital Signal Processor) circuit enables digital IF filter, digital noise reduction, digital PSN (Pulse Shift Network), phase demodulation, digital automatic notich,

32、and etc. The 3rd IF signal is applied to the IF amplifier (MAIN unit; IC1002, pin 5) after being passed through the low-pass filter (MAIN unit; IC1002, pins 3, 1). The amplified 12 kHz 3rd IF signal is amplified at the differential amplifiers (IC651a/b), and is then applied to the A/D convertor sect

33、ion in the CODEC IC (IC501) on the DSP board (EX-2432). At the same time, the converted signal is level-shifted 5 V to 3.3 V in the IC (IC501). LPF Antenna FILTER unit to transmit/receiver switch LPF FI301A FI301B FI401 FI402 Q401 Q5013rd mixer IC501 IC1002 1st mixer Q201 Q202 2nd mixer Q201 Q202 1s

34、t LO 6494 MHz BPF 230 MHz 0.51.9999 MHz BPF Crystal BPF CrystalIF amp. BPF Crystal LPF IF amp. IF amp. DSP UNIT 2nd LO 64 MHz 3rd LO 443 kHz Frequency (MHz) 0.51.999 22.999 34.999 56.999 79.999 1013.999 1417.999 1819.999 2021.999 2223.999 2429.999 BPF ctrl signal B0 B1 B2 B3 B4 B5 B6 B7 B8 LPF ctrl

35、signal L0 L1 L2 L3 L4 L5 L6 L7 RECEIVER CONSTRUCTION 3 - 2 The level-shifted signal is applied to the DSP IC (IC301) for the digital IF filter, demodulator, automatic notch and noise reduction, etc. The output signal from the DSP IC is applied to the D/A con- verter section in the CODEC IC (IC501) t

36、o convert into the analog audio signals. Also the signals are level-shifted 3.3 V to 5 V at the level converter section in the IC (IC501). The level-shifted audio signals are passed through the active filter (IC701a), and then applied to the MAIN unit via J901 (pin 17) as the DRAF signal. 3-1-6 AGC

37、CIRCUIT (DSP AND MAIN UNITS) The AGC (Automatic Gain Control) circuit reduces IF ampli- fier gain and attenuates IF signal to keep the audio output at a constant level. The receiver gain is determined by the voltage on the AGC1 line from the DSP unit. The D/A converter for the AGC (IC102) supplies c

38、ontrol voltage to the AGC1 line and sets the receiver gain with the RF/SQL control. The 3rd IF signal from the CODEC IC (IC501) is detected at the AGC detector section in the DSP IC (IC301). The output signal from the DSP IC is level-shifted at the level converter (IC101) and applied to the D/A converter (IC102). The AGC voltage is amplified at the buffer amplifier section in the