IC-R5_serv.pdf

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1、SERVICE MANUAL COMMUNICATIONS RECEIVER 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan S-13905IZ-C1 2002 Icom Inc. INTRODUCTION DANGER ORDERING PARTS REPAIR NOTES This service manual describes the latest service information for the IC-R5 COMMUNICATIONS RECEIVER at the time of publication. NEVE

2、R connect the receiver to an AC outlet or to a DC power supply that uses more than 6.5 V. Such a connection could cause a fire hazard and/or electric. DO NOT expose the receiver to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when connecting the receiver. DO NOT apply

3、 an RF signal of more than 20 dBm (100mW) to the antenna connector. This could damage the re- ceivers front end. 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

4、 required 8930058920LCD contactIC-R5LOGIC UNIT5 pieces 8810009560 ScrewPH BO M2x6 ZKIC-R5CHASSIS10 pieces Addresses are provided on the inside back cover for your convenience. 1. Make sure a problem is internal before disassembling the receiver. 2. DO NOT open the receiver until the receiver is disc

5、onnected 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 turning tool MUST be used for all adjustments. 5. DO NOT keep power ON for a long time when the receiver is defective. 6. READ

6、 the instructions of test equipment thoroughly before connecting equipment to the receiver. To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or oblig- ation. MODEL IC-R5 Version Europe U.K. Italy U.S.A. France Spain Export-01 Export-02

7、 Canada SYMBOL EUR UK ITA USA FRA ESP EXP-01 EXP-02 CAN AC ADAPTER BC-149D BC-149A BC-149D BC-149D BC-136A BC-136D BC-149A SECTION1SPECIFICATIONS SECTION2INSIDE VIEWS SECTION3DISASSEMBLY INSTRUCTIONS SECTION4CIRCUIT DESCRIPITON 4-1RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . .

8、 . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 4-2PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3 4-3OTHER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9、 . . . . . . . . . . . .4-4 4-4POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5 4-5PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6 SECTION5ADJUSTMENT

10、PROCEDURES 5-1PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 5-2PLL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3 5-3ADJUSTMENT MODE ADJUS

11、TMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5 5-4AUTOMATICALLY ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8 SECTION6PARTS LIST SECTION7MECHANICAL PARTS AND DISASSEMBLY SECTION8SEMI-CONDUCTOR INFORMATI

12、ON SECTION9BOARD LAYOUTS 9-1LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1 9-2RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-

13、3 SECTION10BLOCK DIAGRAM SECTION11VOLTAGE DIAGRAM 11-1LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1 11-2RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14、 . . . . . . . . . . . . .11-2 TABLE OF CONTENTS 1 - 1 SECTION 1SPECIFICATIONS MGENERAL Frequency range: Mode: FM, WFM, AM No. of memory channel: 1250 channel (incl. scan edge and auto memory right ch.) Frequency stability: 6 ppm max. (10C to +60) Tuning steps: 5, 6.25, 10, 12.5, 15, 20, 25, 30, 50,

15、 and 100 kHz Anntena Impedance: 50 Power supply requirement: 2 AA(R6) Ni-Cd, alkaline cells or external power supply (BC-136, CP-17) Polarity: Negative ground Frequency resolution: 5 kHz, 6.25 kHz Current drain (at 3.0 V): Rated audio170 mA typical Standby100 mA typical Power saved41 mA typical (Pow

16、er save ratio is 1 : 4) Usable temperature range: 10C to +60C ( 14F to +140F) Dimensions: 58(W) 86(H) 27(D) mm; (projections not included)2932(W) 338(H) 1116(D) in Weight(with antenna and battely): 185 (g); 6.5 (oz) External SP connector: 3-conductor 3.5(d) mm (18”) / 8 MRECEIVER Receiver system: Tr

17、ipple super heterodyne Intermediate frequency : 1st266.7 MHz 2nd19.65 MHz 3rd450 kHz Sensitivity* : (except spurious points) * FM and WFM are measured at 12 dB SINAD; AM is measured at 10 dB S/N. Squelch Sensitivity: Selectivity: AM / FMmore than 15 kHz / 6 dB less than 30 kHz / 60 dB WFMmore than 1

18、50 kHz / 6 dB Audio output power: 100 mW typical at 10 % distortion with an 8 load All stated specifications are subject to change without notice or obligation. Version EUR, U.K., ITA, ESP, CAN EXP-01, EXP-02 U.S.A. FRA Receive Frequencies (MHz) 0.495 1309.995 0.150823.995, 849.000868.995, 894.00013

19、09.995 0.15029.995, 50.20051.200, 87.500108.000, 144.000146.000 430.000440.000, 1240.0001300.000 Frequency (MHz) 0.495 1.625 1.625 4.995 5.000 29.995 30.000 75.995 76.000 108.000 108.000 117.995 118.000 136.000 136.000 175.000 175.000 221.995 222.000 246.995 247.000 329.995 330.000 469.995 470.000 7

20、70.000 770.000 999.995 1000.000 1309.995 FM 0.32 V 0.2 V 0.18 V 0.2 V 0.18 V 0.28 V 0.35 V WFM 0.89 V 0.71 V 1.0 V AM 1.3 V 0.71 V 0.56 V 0.56 V 0.61 V Frequency (MHz) 0.495 1.625 1.625 5.0 5.0 30.0 30.0 76.0 76.0 108.0 108.0 118.0 118.0 136.0 136.0 175.0 175.0 222.0 222.0 247.0 247.0 330.0 330.0 47

21、0.0 470.0 770.0 770.0 833.0 833.0 1309.995 FM 0.56 V 0.4 V 0.56 V 0.79 V WFM 5.6 V 5.6 V 5.6 V AM 2.5 V 1.8 V 1.8 V 1.8 V SECTION 2INSIDE VIEWS LOGIC UNIT 2 - 1 RF UNIT AF power amplifier (IC450: TA31056F) AF mute switch (Q350: 2SJ144) EEROM (IC2: CAT24WC256) AF filter (Q301: XP6501) +3.2 regurater

22、(IC103: R1111N321B) DC-DC convertor IC102: XC6371A351PR D105: RB551V Battery charger circuit D503: MA133 D500: SB07-03C Q501: 2SB-1132 () () Crystal bandpress filter (Fl3: FL-293) IF amplifer (Q5: 2SC4215) IF amplifier (Q1 XP6501) PLL circuit AGC and AM detector (Q4: XP6501) Barantenra tuning circni

23、t VCO circuit Ceramic bandpass filter (Fl1: EFCH266MKQP1) BOTTOM VIEWTOP VIEW 1st mixer (IC1: PC2757T) PLL IC (IC3: PD3140GS) 2nd mixer (IC10: PC2757T) SECTION 3DISASSEMBLY INSTRUCTIONS 3 - 1 REMOVING THE REAR PANEL 1 Unscrew 2 screws, A. 2 Remove the rear panel in the direction of the arrow. REMOVI

24、NG THE RF UNIT 1 Unscrew 1 screw, B. 2 Unsolder 4 points, C. 3 Remove 1 knob, and 1 cap G. Unscrew 2 nuts, E and F. 4 Unplug, H, to separate the LOGIC unit, and then remove the RF unit. REMOVING THE LOGIC UNIT 1 Unsolder 2 points, I. 2 Unscrew 2 screws, J, and then remove the LOGIC unit. 3 Remove th

25、e LOGIC unit in the direction of the arrow. A Rear panel J LOGIC unit I B C D H RF unit E G F LOGIC unit SECTION 4CIRCUIT DESCRIPTION 4 - 1 4-1 RECEIVER CIRCUITS 4-1-1 BAND SWITCHING CIRCUIT (RF UNIT) The RF signals from the antenna connector pass through the limitter (D68) and an attenuator (D69).

26、The signals are then applied to the antenna switching circuit (D13, D31, D73, D75) which suppress out-of-band signals. 4-1-2 RF CIRCUIT (RF UNIT) The RF circuit amplifies the received signals within the range of frequency coverage and filters out-of-band signals. (1) 0.150 MHz29.999 MHz RF signals (

27、0.15029.999MHz) from an band switching cir- cuit (D73) pass through a low-pass filter (C511C515, L81, L82). The filtered signals are amplified at an RF amplifier (Q505) passing through each filters depending on the receiv- ing frequency. The amplified signals are then applied to the 1st mixer circui

28、t (IC1, pin 1) after being amplified at another RF amplifier (IC11) via the band switching diode (D71). The signals below 1.9 MHz pass through a low-pass filter (C534, C535, C657, C658, L88, L89) via the band switching diode (D66), and are then applied to the RF amplifier circuit (Q505) via the band

29、 switching diode (D67). The 1.9 MHz14.995 MHz signals pass through the band switching diode (D65) and bandpass filter (C522C531, L85L87, L91), and are then applied to the RF amplifier cir- cuit (Q505) via the band switching diode (D70). The 15 MHz29.995 MHz signals pass through the band switching di

30、ode (D63) and high-pass filter (C516C520, L83, L84) and are then applied to the RF amplifier circuit (Q505) via the band switching diode (D64). (2) 118 MHz174.995 MHz, 330 MHz832.995 MHz RF signals (118 MHz174.995 MHz, 330 MHz832.995 MHz) from an antenna switching diode (D75) are passed through each

31、 bandpass filter and RF amplifier, and are then applied to the 1st mixer circuit (IC1) via the band switching diode (D71) and RF amplifier (IC11). The 118 MHz174.995 MHz signals pass through the band switching diode (D74) and low-pass filter (C8C13, C67, C416, L14, L57L59, L70), and are then amplifi

32、ed at RF amplifier (Q14). The amplified signal passes through the tun- able band-pass filters (D1, D2) and band switching diode (D25). The 330 MHz469.995 MHz signals are amplified at RF amplifier (Q35) via the band switching diode (D3) and band- pass filter (C19C23, C216, L2L5). The amplified signal

33、 passes through the tunable band-pass filters (D4, D5) and band switching diode (D29). The 470 MHz832.995 MHz signals are amplified at RF amplifier (Q24) via the band-pass filter (C32, C33, C35C37, C39, C145), between the band switching diode (D11, D32). RF RF BPF BPFBPF RFBPF RFBPF RFBPF RF RF BPF

34、BPF Q26 Q36 Q35 Q24 Q14 D1, D2 D3, D11, D74 D13, D31, D73, D75 D63, D65, D66 D64, D67, D70 Q501, D76 Q505 0.15 30 MHz 118 175 MHz 330 470 MHz 470 833 MHz 833 1309.995 MHz 30 118 MHz, 175 330 MHz D4, D5 D32, D34 D36, D71 D25, D29, D72 HPF LPF LPF LIMITER BAND SW BAND SW BAND SW BAND SW BAND SW BAND S

35、W BAND SW ANTENNA ATT ANT SW 1st mixer (IC1) 1st LO IC11 2nd mixer rcuit RF CIRCUIT 4 - 2 (3) 30117.995 MHz, 175329.995 MHz The 30 MHz117.95 MHz, 175 MHz329.995 MHz signals pass through the band switching circuit and low-pass filter (C40C43, C665, C666, L9, L10, L92), and are then applied to the RF

36、amplifier (Q36). The amplified signals are amplified at the RF amplifier (IC11, pin 1) via band switching diodes (D34, D71). The amplified signals are applied to the 1st mixer circuit (IC1, pin 1). (4) 833 MHz1309.995 MHz The 833 MHz1309.995 MHz signals pass through the band switching diode (D13) an

37、d bandpass filter (C5, C4551, L11L13, L43), and are then applied to the RF amplifier (Q26). The amplified signals are amplified at the RF amplifi- er (IC11, pin 1) via band switching diodes (D36). The ampli- fied signals are applied to 1st mixer circuit (IC1, pin 1). 4-1-3 1ST MIXER CIRCUIT (RF UNIT

38、) The 1st mixer circuit converts the received RF signals to a fixed frequency of the 1st IF signal with a PLL output fre- quency. By changing the PLL frequency, only the desired fre- quency will pass through the bandpass filters at the next stage of the 1st mixer. The filtered RF signals are mixed w

39、ith 1st LO signals at the 1st mixer circuit (IC1) to produce a 266.7 MHz 1st IF signal. The 1st IF signal is output from pin 6, and passed through the bandpass filter (FI1) to suppress unwanted harmonic com- ponents. The filtered 1st IF signal is applied to the 2nd mixer circuit. The 1st LO signals

40、are generated at the 1st VCO (Q28, Q30, D54) and are applied to the 1st mixer (IC1, pin 3) directly or passing through the doubler circuit (Q31) after being ampli- fied at the buffer amplifiers (IC4, Q40). 4-1-4 1ST IF AND 2ND MIXER CIRCUITS (RF UNIT) The 2nd mixer circuit converts the 1st IF signal

41、 to a 2nd IF signal. The filtered 266.7 MHz 1st IF signal from the bandpass filter is mixed with the 2nd LO signal at the 2nd mixer circuit (IC10, pin 1) to produce a 19.65 MHz 2nd IF signal. The 2nd IF sig- nal pass through (except WFM mode) or bypass (WFM mode) the bandpass filter (FI3), and is th

42、en amplified at the 2nd IF amplifier (Q5). The amplified signal is applied to the demodulator circuit. 4-1-5 DEMODULATOR CIRCUITS (RF UNIT) The demodulator circuit converts the 2nd IF signal into AF signals. The 19.65 MHz 2nd IF signal from the 2nd IF amplifier (Q5) is applied to the 3rd mixer secti

43、on of the FM IF IC (IC2, pin 16) and is then mixed with the 3rd LO signal for conversion into a 450 kHz 3rd IF signal. IC2 contains the 3rd mixer, limiter amplifier, quadrature detector and S-meter detector, etc. A frequency from the PLL reference oscillator is used for the 3rd LO signal (19.20 MHz)

44、. (1) FM mode The 3rd IF signal is output from the FM IF IC (IC2, pin 3) and passes through the ceramic bandpass filter (FI2). The filtered signal is fed back and amplified at the limiter amplifier section (pin 5), then demodulated AF signals at the quadrature detector section (pins 10, 11) and dete

45、ctor coil (L21). The demodulated AF signals are output from pin 9 and are applied to the AF circuit (LOGIC unit) via the “FMDET” signal. 16 Limiter amp. 3rd IF filter 450 kHz PLL IC IC3 X1 19.2 MHz RSSI IC2 TA31136F 13 2nd IF (19.65 MHz) from Q5 RSSI signal to the CPU (LOGIC unit; IC1, pin 4) 11109

46、875 32 1716 Active filter FI2 Noise detector FM detector LPF Noise comp. NOISE signal to the CPU (LOGIC unit; IC1, pin 47) 12 R54 R55 C101 C94 R56 C95 C98C99 AM DET. IF amp. C96 R57 R59 R60 WFM L21 C93 C242 FM or WFM AF signal FMDET AM AF signal AMDET Mixer 3rd Q41 DEMODULATOR CIRCUIT 4 - 3 (2) WFM

47、mode The 3rd IF signal from the 3rd mixer bypasses the ceramic fil- ter (FI2) and fed back to the limiter amplifier section (pin 5). The amplified signal is demodulated at the quadrature detec- tor section (pins 10, 11) and detector coil (L21). The AF sig- nals are output from pin 9 and are applied

48、to the AF circuit (LOGIC unit) via the “FMDET” signal. By connecting R55 to R54 in parallel, the output characteris- tics of pin 12, “RSSI”, change gradually. Therefore, the FM IF IC can detect WFM components. (3) AM mode The filtered 3rd IF signal from the bandpass filter (FI2) is amplified at the

49、3rd IF amplifier (Q1). The amplified IF signal is applied to the AM detector circuit (Q4) to converted into AF signals, and the signals are applied to the AF circuit (LOGIC unit) via the “AMDET” signal. 4-1-6 AF AMPLIFIER CIRCUIT (LOGIC UNIT) The AF amplifier circuit amplifies the demodulated AF signals to drive a speaker. While in FM mode, AF signals from the demodulator circuit (RF unit) are passed through the de-emphasis circuit (R323, C316, C318) with frequency characteristics of 6 dB/octave, and a