IC-R6_serv.pdf

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1、S-14622XZ-C1 Feb. 2010 COMMUNICATIONS RECEIVER This service manual describes the latest technical information for the IC-R6 COMMUNICATIONS RECEIVER, at the time of publication. NEVER connect the receiver to an AC outlet or to a DC power supply that uses more than specified. This will ruin the transc

2、eiver. 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 an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the receivers front-end. To upgrade quality, any electric

3、al or mechanical parts and internal circuits are subject to change without notice or obligation. MODELVERSION SUPPLIED BATTERY CHARGER IC-R6 EUR UK CHN ITA USA FRA ESP EXP CAN EUR-01BC-196SD CHN-01BC-153SC ITA-01BC-196SD USA-01BC-196SA FRA-01 BC-196SD ESP-01 CAN-01BC-196SA Be sure to include the fol

4、lowing 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 1110007300 NJM2552V IC-R6 RF UNIT 2 pieces 8210026030 3250 REAR PANEL IC-R6 CHASSIS 3 pieces Addresses are provided on the inside back cover f

5、or your convenience. ORDERING PARTS 1. Make sure that the problem is internal before disassembling the receiver. 2. DO NOT open the receiver until the receiver 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 ci

6、rcuits 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 receiver is defective. 6. READ the instructions of test equipment throughly before connecting a test equipment to the receiver. REPAIR NOTES INTRODUCTION CAUTION Ic

7、om, 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 CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY INSTRUCTION SECTION 4

8、 CIRCUIT DESCRIPITON 4-1 RECEIVER CIRCUITS (RF UNIT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4-2 AF CIRCUITS (LOGIC UNIT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4-3 FREQUENCY SYN

9、THESIZER CIRCUITS (RF UNIT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4-4 VOLTAGE BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 4-5 CPU PORT ALLOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . .

10、. . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-2 FREQUENCY ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . .

11、. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 5-3 RECEIVE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS SECTION 8 BOARD LAYOUTS SECTION 9 BLOCK DIAGRAM SECTION 10 VOL

12、TAGE DIAGRAM LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1 RF UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3

13、 1 - 1 SECTION 1. SPECIFICATIONS Frequency coverage : (Unit: MHz) USA 0.100821.995, 851.000866.995, 896.0001309.995 France 0.10029.995, 50.20051.200, 87.500107.995, 144.000146.000, 430.000440.000, 1240.0001300.000 Other than above 0.1001309.995 Number of memory channels : 1300 Frequency resolution :

14、 5, 6.25, 8.33*, 9*, 10, 12.5, 15, 20, 25, 30, 50, 100, 125, 200 kHz * Selectable depending on the operating frequency band. Receive modes : FM, WFM, AM Operating temperature range : 10C to +60C; +14F to +140F Reference frequency stability : 1.0 ppm (+25C) Power supply requirement : 2 AA (R6) alkali

15、ne cells 2 AA (R6) Ni-MH cells 4.5 to 6.3 V DC (with AC adapter or CP-18A/E) Current drain (backlight OFF at 3.0 V DC): rated audio 130 mA typical receive stanby 65 mA typical power save 30 mA typical charging 140 mA typical Antenna connector : SMA (50 ) Dimensions : 58(W) 86(H) 29.8(D) mm (projecti

16、ons not included) 2932(W)338(H)1316(D) in Weight (approximately) : 200 g; 7.1 oz (with supplied antenna and batteries) Receive system : Triple-conversion superheterodyne Intermediate frequencies : 1st 266.7 MHz 2nd 19.65 MHz (FM/AM) 19.95 MHz (WFM) 3rd 450 kHz (FM/AM) 750 kHz (WFM) Sensitivity (exce

17、pt spurious points): FM (1 kHz/3.5 kHz Dev.; 12 dB SINAD) 1.6254.995 MHz 0.32 V typical 5.00029.995 MHz 0.25 V typical 30.000469.995 MHz 0.18 V typical 470.000832.995 MHz 0.32 V typical 833.0001029.995 MHz 0.28 V typical 1030.0001309.995 MHz 0.35 V typical WFM (1 kHz/52.5 kHz Dev.; 12 dB SINAD) 76.0

18、00108.000 MHz 1.1 V typical 175.000221.995 MHz 1.1 V typical 470.000770.000 MHz 1.8 V typical AM (1 kHz/30% MOD.; 10 dB S/N) 0.4954.995 MHz 1.3 V typical 5.00029.995 MHz 0.89 V typical 118.000136.000 MHz 0.63 V typical 222.000246.995 MHz 0.63 V typical 247.000329.995 MHz 0.79 V typical Selectivity :

19、 AM/FM More than 12 kHz/9 dB Less than 30 kHz/60 dB WFM More than 150 kHz/6 dB Audio output power : (at 10% distortion/3.0 V DC) Internal speaker More than 150 mW with a 16 load External speaker 80 mW typical with an 8 load Ext. speaker connector : 3-conductor 3.5 (d) mm (18)/8 All stated specifi ca

20、tions are subject to change without notice or obligation. P GENERALP RECEIVER 2 - 1 SECTION 2. INSIDE VIEWS LOGIC UNIT (TOP VIEW) VOLTAGE LIMITER (D511) TONE FILTER (IC200) CPU (IC1) IFV LINE SW (Q104) LOGIC3.3V REGULATOR (Q103) +5 V REGULATOR (IC455) +3 V REGULATOR (IC104) RESET (IC3) 2 - 2 DC-DC C

21、ONVERTER UP CONVERTER CIRCUIT FOR TUNING VOLTAGE LOGIC UNIT (BOTTOM VIEW) AF FILTER (Q301) AF PRE-AMP (Q300) CI-V LEVEL CONVERTER (IC452) SPEAKER MUTE SW (Q507) +3S LINE REGULATOR (Q102) REGULATOR FOR AF AMP (IC454) AF MUTE SW (Q350) EEPROM (IC2) AF FILTER CTRL (Q508) WIDE/NARROW MODE SW (Q302) CLOC

22、K SHIFT SW (Q1) AF POWER AMP (IC450) DC SW (Q500) ELECTRIC VOLUME (IC451) CHARGING CIRCUIT 2 - 3 2nd VCO1st VCO DOUBLER CIRCUITS PLL CIRCUIT RF UNIT (TOP VIEW) RF UNIT (BOTTOM VIEW) REFERENCE FREQUENCY OSCILATOR (X1) WFM/FM MODE SW (D55) IF DEMODULATOR IC (IC12) 1st IF MIXER (IC1) 2nd IF MIXER (Q523

23、) NOISE AMP (IC13) BAR/EXTERNA ANTENNA SW (Q510) RF AMP (Q505) BAR ANTENNA TUNING DIODE (D100) ATTENUATOR DRIVER (Q521) ATTENUATOR (D68) 1st IF FILTER (FI1) WFM/FM MODE SW (D56) 2nd IF FILTER (FI3) 1.2 GHz/800 MHz RF CIRCUIT SW (Q503) VHF/UHF RF CIRCUIT SW (Q502) EXPANDER (IC17) WFM/FM MODE SW (Q516

24、) FM/AM AF LINE SW (IC14) INVERTER (IC19) HF RF CIRCUIT SW (Q504) EARPHONE ANTENNA SW (Q514) 3 - 1 SECTION 3. DISASSEMBLY INSTRUCTION 1. REMOVING THE REAR PANEL 1) Remove the battery cover. 2) Remove 2 screws and jack cap. 3. REMOVING THE LOGIC UNIT 1) Remove the dial knob, 2 nuts and 2 screws from

25、the front panel. 2) Unsolder the 2 points from the speaker. 3) Remove the rear panel in the direction of the arrow. (NOTICE: The latch falls off when removing the rear panel.) SCREW2 JACK CAP UNSOLDER Solder remover SCREW ANT NUT VOL NUT DIAL KNOB FRONT PANEL SPEAKER Remove with; “ICOM Driver (L2)”

26、(8960000171) “ICOM Driver (Q)” (8960000370) Remove with; LOGIC UNIT FRONT PANEL REAR PANEL LATCH UNSOLDER Solder remover UNSOLDER Solder remover SCREW RF UNIT 2. REMOVING THE RF UNIT 1) Remove a screw from the RF UNIT. 2) Unsolder the total of 8 points as shown below. 3) Remove the RF UNIT in the di

27、rection of the arrow. 3) Remove the LOGIC UNIT in the direction of the arrow. (Continued to the right above) 4 - 1 1529.995 MHz The RX signal from the antenna connector (CHASSIS; J1) is applied to the RF AMP (Q505) through the band SWs (D63, D64 and D73), LPF and the HPF. The amplified signal is pas

28、sed through the band SWs (D71 and D72), and then applied to another RF AMP (IC18). 30117.995 MHz and 175329.995 MHz The RX signal from the antenna connector (CHASSIS; J1) is applied to the RF AMP (Q36) through the band SW (D13) and the BPF. The amplified signal is passed through the band SWs (D34 an

29、d D71), and then applied to another RF AMP (IC18). 118174.995 MHz The RX signal from the antenna connector (CHASSIS; J1) is applied to the RF AMP (Q14) through the band SWs (D74 and D75) and BPF. The amplified signal is passed through the tuned BPF (D1 and D2) and band SWs (D25 and D71) and then app

30、lied to another RF AMP (IC18). 330469.995 MHz The RX signal from the antenna connector (CHASSIS; J1) is applied to the RF AMP (Q35) through the band SWs (D3 and D75) and the BPF. The amplified signal is passed through the tuned BPF (D4 and D5) and band SWs (D29 and D71), and then applied to another

31、RF AMP (IC18 ). 470832.995 MHz The RX signal from the antenna connector (CHASSIS; J1) is applied to the RF AMP (Q24) through the band SWs (D11 and D75) and BPF. The amplified signal is passed through the band SWs (D32 and D71), and then applied to another RF AMP (IC18). 8331309.995 MHz The RX signal

32、 from the antenna connector (CHASSIS; J1) is applied to the RF AMP (Q26) through the band SW (D13) and BPF. The amplified signal is passed through the band SW (D36), and then applied to another RF AMP (IC18). The signal from the RF AMP (IC18) is applied to the 1st IF circuits. 4-1 RECEIVER CIRCUITS

33、(RF UNIT) EARPHONE ANTENNA When using the connected earphone as an antenna, RX signal from the earphone is applied to the RF circuits (except 0.101.895 MHz band), through the earphone antenna SW (D101 and D109). ATTENUATOR CIRCUIT When the attenuator is activated, the PIN diode (D68) is forward-bias

34、ed and a 10 dB (approx.) attenuator is composed. The switching of D68 is carried out by Q521 with the control signal “ATT.” RF CIRCUITS The RX signal from the antenna is applied to appropriate RF circuits, according to the RX frequency. 0.101.895 MHz When using an external antenna; The RX signal fro

35、m the antenna connector (CHASSIS; J1) is applied to the RF AMP (Q505) through the band SWs (D66, D67 and D73) and LPFs. When using the internal bar antenna; The RX signal from the internal bar antenna (CHASSIS; EP2) is applied to the RF AMP (Q505) through the ANT SW (D76). The amplified signal is pa

36、ssed through the band SWs (D71 and D72), and then applied to another RF AMP (IC18). 1.914.995 MHz The RX signal from the antenna connector (CHASSIS; J1) is applied to the RF AMP (Q505) through the band SWs (D65, D70 and D73), LPF and the BPF. The amplified signal is passed through the band SWs (D71

37、and D72), and then applied to another RF AMP (IC18). RF CIRCUITS SECTION 4. CIRCUIT DESCRIPTION RF AMP BPF BPF BPF TUNED BPF TUNED BPF J1(CHASSIS) BPF BPF ATT ANT SW LPF LPF BPF HPF RF AM P RF AM P RF AM P RF AM P RF AM P RF AM P BAND SW BAND SW BAND SW BAR ANTENNA BAND SW BAND SW BAND SW ATT RF UNI

38、T D13,D31, D73,D75 D63,D65,D66 Q510,D76 D64,D67,D70 Q505,Q527 D3,D11,D74 Q14 D1,D2 Q35 D4,D5 Q24 D25,D29,D32, D34,D72 Q36 Q26 D36,D71 IC18 To the 1st IF circuits 0.10-29.995 MHz 0.10-1.895 MHz 0.10- 1.895 MHz 1.9-14.995 MHz 15-29.995 MHz 118-174.995 MHz 330-469.995 MHz 470-832.995 MHz 30-117.995 MHz

39、 175-329.995 MHz 833-1309.995 MHz Q521 D68 EARPHONE ANT SW Q514, D101,D109 ANT CONNECTOREARPHONES ANTENNA J2 EXT SP 4 - 2 1ST IF AND 2ND IF CIRCUITS 3RD IF AND DEMODULATOR CIRCUITS 1ST IF CIRCUIT (RF UNIT) The RX signal from the RF circuit is applied to the 1st IF mixer (IC1) to be mixed with the 1s

40、t LO signal from the 1st LO VCO (Q528, Q529, D105 and D106), resulting in the 266.7 MHz 1st IF signal. The 1st IF signal is filtered by the 1st IF filter (FI1), and then applied to the 2nd IF mixer (Q523). 2ND IF CIRCUIT (RF UNIT) The 1st IF signal is applied to the 2nd IF mixer (Q523) to be mixed w

41、ith the 2nd LO signal from the 2nd LO VCO (Q6 and D17), resulting in a 19.65 MHz (for FM and AM modes) or 19.95 MHz (for WFM mode) 2nd IF signal. The 2nd IF signal is filtered by the 2nd IF filter (FI3; for FM and AM modes, or C507, C714 and C715; for WFM mode), and then applied to the 2nd IF AMP (Q

42、5). The amplified 2nd IF signal is applied to the 3rd IF circuits. X2X2 LPF BPF IF AM P BPF XTAL BPF MODE SWSW MODE LO SW SW LO RF UNIT To the 3rd IF circuits From the RF circuits 1st LO VCO 2nd LO VCO IC1 FI1 Q523 D58,D59 FI3 D60,D61 Q5 D47,D50,D52 Q31Q31 D42-D44 266.7 MHz 266.8-1099.695 MHz FM,AM:

43、 247.050/286.350 MHz 19.650 MHz 1st Lo 2nd Lo 19.950 MHz WFM : 246.750/286.650 MHz PLL IC X1 BPF CERAMI C SQ L AMP IF IC SW MODE SW MODE RF UNIT SW AF line From the 2nd IF circuits To the AF circuits IC12 D56 D55 FI2 19.200 MHz 3rd IF IC14 3rd Lo:19.2 MHz FM,AM: 450 kHz NOISE IC13 WFM: 0.750 MHz 3RD

44、 IF AND DEMODULATOR CIRCUITS (RF UNIT) The signal from the 2nd IF AMP (Q5) is applied to the IF de- modulator IC (IC12) which contains the 3rd IF mixer, 3rd IF AMPs and FM/AM demodulator circuits, etc. in its package. The 2nd IF signal is applied to the 3rd IF mixer and mixed with the 3rd LO signal

45、from the reference frequency oscil- lator (TCXO; X1), resulting in a 450 kHz (for FM and AM modes) or 750 kHz (for WFM mode) 3rd IF signal. The converted 3rd IF signal is passed through or bypassed the ceramic BPF (FI2) to eliminate unwanted signal, and amplifi ed by the 3rd IF AMP, then demodulated

46、 by the FM/ AM detector. The FM detector employs a ceramic discriminator for the de- modulation for FM mode and LC discriminator for the WFM mode as a phase shifter. The AM detector employs a diode detector circuitry. The demodulated AF signal is applied to the AF circuits on the LOGIC UNIT through

47、the AF line SW (IC14). 4-2 AF CIRCUITS (LOGIC UNIT) FM mode The demodulated AF signal is passed through the de-emphasis circuit (R323 and C316) and AF filter (Q301), and then applied to the AF AMP (Q300) through the AF line SW (D300). Wide FM/AM mode The demodulated AF signal is passed through the A

48、F filter (R316, R320 and C314) and the AF line SW (Q302), and then applied to the AF AMP (Q300). The amplified AF signal is passed through the LPF (R350 and C404), whose frequency response is changed by Q508 according to the user setting (The AF FILTER). The filtered AF signal is passed through the

49、AF mute SW (Q350), and then adjusted in level by the electric VR (IC451). The level-adjusted AF signal is applied to the AF power AMP (IC450). AUDIO POWER AMPLIFIER IC450 is a BTL (Bridge-Tied Load) audio power amplifier which provides high AF output power. The amplified AF signal is passed through the speaker mute SW (Q507), and then applied to the internal or external speaker. AF CIRCUITS 4 - 3 AF AMP AF MUTE AF AMP SP1 J2 LOGIC UNIT WFM/AM FMAF