IC-E7_serv.pdf

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1、SERVICE MANUAL VHF/UHF DUALBAND FM TRANSCEIVER S-14217HZ-C1 Nov. 2005 INTRODUCTION This service manual describes the latest service information for the IC-E7 VHF/UHF DUALBAND FM TRANSCEIVER at the time of publication. ORDERING PARTS Be sure to include the following four points when ordering replacem

2、ent parts: 1. 10-digit Icom parts number 2. Component name and informations 3. Equipment model name and unit name 4. Quantity required 5030002860 LCD A01B004X IC-E7 Main unit 5 pieces 8810008990 Screw PH B0 210 ZK IC-E7 Chassis 10 pieces Addresses are provided on the inside back cover for your conve

3、nience. REPAIR NOTES 1. Make sure the 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 components. Turn them slowly and smoothly. 4. DO NOT short any circuits or e

4、lectronic parts. An insulated turning tool MUST be used for all adjustments. 5. DO NOT keep power ON for a long time when the transceiver is defective. 6. DO NOT transmit power into a signal generator or a sweep generator. 7. ALWAYS connect a 30 dB to 40 dB attenuator between the transceiver and a d

5、eviation meter or spectrum analyzer when using such test equipment. 8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver. To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or obligation. M

6、ODELVERSIONSYMBOL IC-E7 EuropeEUR ItalyITR FranceFRA United KingdomUK Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries. NEVER connect the transceiver to an AC outlet or to a

7、 DC power supply 3.7 V. Such a connection could cause a fire or electric hazard. 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 connec

8、tor. This could damage the trans- ceivers front end. DANGER TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY INSTRUCTIONS SECTION 4 CIRCUIT DESCRIPITON 4 - 1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9、 . . . . . . . . . . . . . . . . . . . 4 - 1 4 - 2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 2 4 - 3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10、 . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 3 4 - 4 PORT ALLOCATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 4 4 - 5 POWER SUPPLY CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11、. . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 5 SECTION 5 ADJUSTMENT PROCEDURES 5 - 1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1 5 - 2 FREQENCY AND TRANSMIT ADJUSTMENT . . . . .

12、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 4 5 - 3 RECEIVE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 5 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS AND DISASSEMBLY

13、 SECTION 8 SEMICONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 - 1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1 9 - 2 PA BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1 9 - 3 VCO BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1 SECTION 10 BLOCK DIAGRAM SECTION 11 CIRCUIT DIAGR

15、AM SECTION 12 BC-164 1 - 1 SECTION 1 SPECIFICATIONS GENERAL Frequency range : VersionTransmit (MHz)Receive (MHz) EUR, UK 144.000146.000 430.000440.000 0.495999.990 ITR 144.000146.000 430.000434.000 435.000438.000 144.000146.000 430.000434.000 435.000438.000 FRA 146.000146.000 430.000440.000 0.49529.

16、995 50.20051.200 76.000135.995 144.000146.000 430.000440.000 Operating mode: FM, AM*, WFM* (*RX only) Memory channels: 1000 channels Call channels: 2 channels Scan types: Full/Program/Priority/ Memory Channel/Bank/ Bank-Link/Skip/Tone Frequency stability: 6 ppm (10C to +60C) Tuning steps: 5/6.25/8.3

17、3/9/10/12.5/15/20/ 25/30/50/100 and 200 kHz Antenna impedance: 50 (SMA type) Power supply requirement : Specifi ed Icoms battery pack only (operating voltage 3.7 V) Current drain: TRANSMIT VHF High 1.5 A Low 0.4 A (approx.) UHF High 1.5 A Low 0.5 A (approx.) RECEIVE Stand-by 80 mA (approx.) Max. aud

18、io Less than 150 mA Operating temp. range: 10C to +60C Dimensions (projections not included) :47 (W) 81 (H) 28 (D) mm Weight (antenna, BP-243 included) : 160 g (approx.) MIC/SP connector: 4-conductor 3.5 (d) mm; (1/8) 2 k/8 TRANSMITTER Output power: VHF UHF 1.5 W (High) 0.1 W (Low; aprrox.) 1.0 W (H

19、igh) 0.1 W (Low; aprrox.) Modulation system: Variable reactance frequency modulation Maximum deviation: 5.0 kHz Spurious emissions: Less than 60 dB (TX High) Less than 50 dB (TX Low) RECEIVER Receiving system: Double conversion superheterodyne system Intermediate frequencies: FM, AM1st; 46.35 MHz 2n

20、d; 450 kHz WFM1st; 14.85 MHz 2nd; 450 kHz Sensitivity*: (except spurious points; maximum sensitivity) Frequency (MHz)FMAMWFM 0.4954.995 +7 dB 5.00029.995+3 dB 30.00075.995 7 dB 76.00089.995 +5 dB 90.000107.995 14 dB 108.000117.995 118.000136.995+3 dB 137.000143.995 144.000147.99515 dB 148.000179.995

21、14 dB 330.000369.995+5 dB 370.000399.99510 dB 400.000429.99513 dB 430.000449.99515 dB 450.000499.9955 dB 600.000799.990 0 dB +8 dB 799.995939.990 940.000999.990+5 dB *FM and WFM are measured at 12 dB SINAD, AM is easured at 10 dB S/N. Squelch sensitivity (at threshold) : Less than 15 dB Selectivity:

22、 FM, AMMore than 12 kHz/6 dB Less than 30 kHz/60 dB WFMMore than 150 kHz/10 dB Less than 700 kHz/20 dB Spurious image rejection: More than 40 dB Audio output power: More than 50 mW at 10% distortion with an 8 load All stated specifi cations are subject to change without notice or obligation. SECTION

23、 2 INSIDE VIEWS 2 - 1 CPUCPU (IC4: M30220FCRP)(IC4: M30220FCRP) PTT detectorPTT detector (Q14: 2SA1832)(Q14: 2SA1832) D/A convertorD/A convertor (IC13: BH2220FVM)(IC13: BH2220FVM) ReferenceReference frequency generatorfrequency generator (X1: CR-813 7.325MHz)(X1: CR-813 7.325MHz) Reset ICReset IC (I

24、C2: R3112N291A)(IC2: R3112N291A) CPU (IC4: M30220FCRP) PTT detector (Q14: 2SA1832) D/A convertor (IC13: BH2220FVM) CTCSS filter (IC5: LM2904PWR) Microphone amplifier (IC8: LMV324IPW) Reference frequency oscillator (X1: CR-813 7.325 MHz) Reset IC (IC2: R3112N291A) Antenna switch circuitAntenna switch

25、 circuit +3V regulator+3V regulator (IC10: R1111N321B)(IC10: R1111N321B) PLL ICPLL IC (IC18: ADF4110BCPZ)(IC18: ADF4110BCPZ) VCO boardVCO board AF volumeAF volume (IC7: SM6451B)(IC7: SM6451B) AF amplifierAF amplifier (IC9: NJM2070M)(IC9: NJM2070M) IF ICIF IC (IC15: TA31136FNG)(IC15: TA31136FNG) 1st

26、mixer1st mixer (IC16: (IC16: PC2757TB)PC2757TB) Antenna switching circuit +3V regulator (IC10: R1111N321B) PLL IC* (IC18: ADF4110BCPZ) VCO board * Located under the VCO board AF volume* (IC7: SM6451B) AF power amplifier (IC9: NJM2070M) FM IF IC (IC15: TA31136FNG) 1st mixer (IC16: PC2757TB) MAIN UNIT

27、 (TOP VIEW) MAIN UNIT (BOTTOM VIEW) PA BOARD Final amplifier*Final amplifier* (Q3: RQA003)(Q3: RQA003) Drive amplifierDrive amplifier (Q2: 2SC5998)(Q2: 2SC5998) Pre drive amplifierPre drive amplifier (Q1: 2SC5006)(Q1: 2SC5006) Power amplifier* (Q3: RQA003) Drive amplifier (Q2: 2SC5998) Pre-drive amp

28、lifier (Q1: 2SC5006) * Located bottom side of the point. SECTION 3 DISASSEMBLY INSTRUCTIONS 3 - 1 Removing the chassis 1 Remove the battery pack. 2 Remove the jack cap A and unscrew the antenna nut B. 3 Remove the dial knob C. 4 Unscrew 2 screws D and lift up the chassis in the direction of the arro

29、w. Removing the MAIN unit and PA board 1 Unscrew 2 screws A, then remove the LCD panel B. 2 Unscrew 5 screws C and dial nut D. 3 Unsolder 2 points E. 5 Incline the chassis as figure below and disconnect the speaker cable E. 6 Remove the chassis from the front panel. Chassis A B C D Chassis Front pan

30、el E MAIN unit B C E C C D A C 4 Release the projection F, and remove the MAIN unit. 5 Unsolder 11 points G and remove the PA board from the MAIN unit. MAIN unit F PA board G MAIN unit (Top side) SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVE CIRCUITS 4-1-1RF CIRCUITS (MAIN UNIT) This transceiver has 4 R

31、F circuits to provide wide receiving range. The received signals from the antenna connector (CHASSIS; J1) are applied to each RF circuits for the frequency coverage, and amplified within the frequency coverage. While receiving 0.49576 MHz The 0.49576 MHz band signals are passed through the three low

32、-pass filters (LPF; L32, L34, L39, L42, C284, C290, C294, C307, C314), then applied to the RF amplifier (Q38) via the band switches (D30, D43) and LPF or BPF. The 0.49530 MHz band signals are passed through the LPF (L20, C241, C242, C247), the 3076 MHz signals are passed through the Bandpass Filter

33、(BPF; D39, L21, L24, C238, C256) before being applied to the RF amplifier (Q38). The amplified signals are applied to the 1st mixer (IC16, pin 1) via the band switch (D16). - 0.49576 MHz - While receiving 76300 MHz The 76300 MHz band signals are passed through two LPFs (L39, L42, C307, C314) and a c

34、ouple of High-pass Filter (HPF; L33, C287, C293) and LPF (L29, L31, C266, C269, C276, C283, C514, C516), then applied to the RF amplifier (Q42) via the antenna switching circuit (D35, D38) and the LPF (D53, L44, C295, C303). The amplified signals are then applied to the 1st mixer (IC16, pin 1) via t

35、he BPF (D27, D28, D31, D36, L10, L11, L22, L23, C208, C210, C216, C228, C233, C243) and band switch (D21). - 76300 MHz - 4 - 1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? to the 1st mixer (IC16, pin 1) 0.49530 MHz D39 D16 D30 Q38 D43 D44 3076 MHz from the antenna RF amp LPF ATT BPF LPF LPF 3 LPFs to t

36、he 1st mixer (IC16, pin 1) D21 D53 D27, D28, D31, D36 Q42 from the antenna BPF LPF LPFLPFHPFLPF RF amp 2 LPFs D35, D38 ANT SW While receiving 300500 MHz The 300500 MHz band signals are passed through the LPF (L42, C314) and a couple of HPF (L38, C302, C306) and LPF (D41, D45, L26, L30, C255, C257, C

37、262, C275, C282, C289, C515), then applied to the RF amplifier (Q43) via the antenna switching circuit (D34, D37) and the BPF (D55, L36, L106, C304, C522, C523). The amplified signals are then applied to the 1st mixer (IC16, pin 1) via the BPF (D26, D32, L13, L25, C204, C215, C222, C236, C244, C520,

38、 C521) and band switch (D22). - 300500 MHz - to the 1st mixer (IC16, pin 1) D55D41, D45D26, D32 D22 Q43 LPFBPFBPFHPFLPF from the antenna RF amp D34, D37 ANT SW While receiving 500999 MHz The 500999 MHz band signals are passed through the HPF (L41, C311, C313) and band switch (D54), then applied to t

39、he RF amplifier (Q45) via the attenuator (D46). The amplified RF signals are applied to another RF amplifier (Q39) via the BPF (D33, D40, L15, L27, L28, C229, C237, C245, C252, C261). The amplified RF signals are then applied to the 1st mixer (IC16, pin 1) via the band switch (D23). - 500999 MHz - t

40、o the 1st mixer (IC16, pin 1) D23Q39 Q45 D54 D46 ATT from the antenna HPFBPF RF amp RF amp D33, D40 4-1-2 1ST IF CIRCUITS (MAIN UNIT) The 1st IF circuits contain the 1st mixer, 1st IF amplifier and the 1st IF fi lter. The 1st IF mixer converts the received signals into a fixed frequency of the 1st I

41、ntermediate Frequency (IF) signal. The converted 1st IF signal is fi ltered at the 1st IF fi lters, then amplifi ed at the 1st IF amplifi er. The received signals from the RF circuits are applied to the 1st IF mixer (IC16, pin 1), and converted into the 46.35 MHz (AM/FM)/14.85 MHz (WFM) 1st IF signa

42、l by being mixed with 1st Local Oscillator (LO) signals from the VCOs (VCO BOARD). While receiving 0.576 MHz band signals, the 1st LO signals are generated at 50 MHz VCO (VCO BOARD; Q10, Q13, D7, D8), and for receiving 76280 MHz band signals, the 1st LO signals are generated at 144 MHz VCO (VCO BOAR

43、D; Q9, Q12, D6). While receiving 280999 MHz band signals, the 1st LO signals are generated at 430 MHz VCO (VCO BOARD; Q8, Q11, D5). If the receiving frequency is 500 MHz and above, the VCO output signal is doubled at the doubler circuit (Q18) before being to applied to the 1st mixer (IC16, pin 3). T

44、he converted IF signal is passed through the 1st IF filter FI3 (AM/FM mode) or FI2 (WFM mode) to filter out the unwanted signal, then applied to the 1st IF amplifier (Q9). The amplifi ed 1st IF signal is then applied to the FM IF IC (IC15, pin 16). 1st IF CIRCUIT 4 - 2 16 R3V X1 Q51, Q52 1110 FM IF

45、IC (IC15) 2ND IF DEMODULATOR CIRCUIT 9 1312 “NOISE” signal to the CPU (IC4, pin 47) 1st IF signal from the 1st mixer (IC16, pin 6) “RSSI” signal to the CPU (IC4, pin 4) 2 8 735 LPF BPF (WFM) (FM) RSSI Noise Detector Noise Amplifier Limitter AmplifierQuodrature Detector FI1 2nd IF signal to the AM de

46、modulator (Q19, Q20) FM-demodulated signals to the AF circuits X2 TCXO L103 D12 D10 15.3/45.9 MHz 2nd LO signal Q29 LPF HPF D51 1 D52 3 4-1-3 2ND IF AND DEMODULATOR CIRCUITS (MAIN UNIT) The 1st IF signal is converted into the 2nd IF signal and demodulated in the FM IF IC. The FM IF IC contains 2nd m

47、ixer, limiter amplifier, quadrature detector, etc. in its package. The 1st IF signal from the 1st IF amplifi er (Q9) is applied to the 2nd mixer in the FM IF IC (IC15, pin 16), and converted into the 2nd IF signal by being mixed with the 2nd LO signal from the reference frequency oscillator (X2) tri

48、pled by the tripler (Q29). The converted 2nd IF signal is output from pin 3, and passed through the 2nd IF filter via the FM/WFM switch (D12) to suppress sideband noise. FM/WFM mode In FM mode, the 2nd IF signal is passed through the BPF (FI1). In WFM mode, the signal passed through the LPF (L2, C136). The filtered 2nd IF signal is applied to the limiter amplifier in the FM IF IC (pin 5) via the FM/WFM switch (D10). The amplifi ed 2nd IF signal is FM-demodulated at the quadrature detector section and output from pin 9. The demodulated AF signals are applied to the AF amplifi er circuits