ID-880H_ID-E880_serv.pdf

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1、S-14529XZ-C1 Apr. 2009 VHF/UHF DIGITAL TRANSCEIVER This service manual describes the latest technical information for the ID-880H and ID-E880 VHF/UHF DIGITAL TRANSCEIVER at the time of publication. NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than specified. T

2、his will ruin the 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.

3、 To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. MODELVERSION TYPE OF EMISSION Max. TX POWER (VHF/UHF) ID-880H TPE F2D, F3E, F7W 25/25 USA 50/50 KOR AUS CHN EXP ID-E880 EUR ITR EUR-01 Be sure to include the following fo

4、ur points when ordering replacement parts: 1. 10-digit Icom parts numbers 2. Component name 3. Equipment model name and unit name 4. Quantity required 1110003491 S.ID TA31136FNG ID-880E/ID-880H MAIN UNIT 5 pieces 8820001210 Screw 2438 screw ID-880H/ID-E880 Top cover 10 pieces Addresses are provided

5、on the inside back cover for your convenience. Icom, Icom Inc. and IDOM 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 that the problem is internal before disasse

6、mbling 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 electronic parts. An insulated tuning tool MUST be used for all adjustmen

7、ts. 5. DO NOT keep power ON for a long time when the transceiver is defective. 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 equipme

8、nt. 8. READ the instructions of test equipment throughly before connecting a test equipment to the transceiver. REPAIR NOTES INTRODUCTIONCAUTION (ID-880H) TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY INSTRUCTION SECTION 4 CIRCUIT DESCRIPITON 4-1 RECEIVER CI

9、RCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 4-3 FREQUENCY SYNTHESIZER . . . . . . . . . .

10、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 4-4 CPU (MAIN UNIT; IC25) PORT ALLOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 4-5 VOLTAGE BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11、 . . . . . . . . . . . . . . 4-8 SECTION 5 ADJUSTMENT PROCEDURE 5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-2 FREQUENCY AND TRANSMIT AMPLIFIER ADJUSTMENTS. . . . . . . . . . . . . . . . . . . . . . .

12、. . 5-3 5-3 ANALOG DEVIATION ADJUSTMENTS (VHF BAND). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 5-4 ANALOG DEVIATION ADJUSTMENTS (UHF BAND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5 5-5 DIGITAL DEVIATION ADJUSTMENT . . . . . . . . . . . . . . . . . . .

13、. . . . . . . . . . . . . . . . . . . . . . . . . 5-6 5-6 RECEIVE SENSITIVITY ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7 5-7 S-METER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14、 . . 5-8 5-8 SQUELCH ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS SECTION 8 BOARD LAYOUTS SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM CONTROL UNIT . . . . . . . . . . . .

15、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 MAIN UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2 1 - 1 SECTION 1. SPECIFICATIONS Selectable depending on

16、 the operating frequency band. : Version TXRX U.S.A. 144148, 430450 118173.995*1, 230549.995*2, 810823.990*4, 849868.990*4, 894999.990*4 CHN EXP 136173.995*1, 400469.995*3 118173.995*1, 230549.995*3, 810999.990*4 KOR 144146, 430440 144146, 430440 AUS 144148, 430440 144148, 430440 TPE 144146, 430432

17、144146, 430432 *1Guaranteed 144148 MHz only, *2Guaranteed 430450 MHz only, *3Guaranteed 430440 MHz only, *4Not Guaranteed D GENERAL Frequency coverage : Type of emission : FM, AM (Receive only), DV Number of memory channels : 1052 (incl. 50 scan edges and 2 calls) Frequency resolution : 5, 6.25, 8.3

18、3, 10, 12.5, 15, 20, 25, 30, 50, 100, 125, 200 kHz Operating temperature range : 10C to +60C; +14F to +140F Frequency stability : 2.5 ppm (10C to +60C) Power supply requirement : 13.8 V DC 15% Current drain (at 13.8 V DC: approx.): Transmit at 50 W VHF: 11.5 A* UHF: 12.5 A* * 8.0 A (at 25 W) only fo

19、r the TPE version Receive standby 0.9 A (simultaneous receive) max. audio 1.2 A Antenna connector : SO-239 (50 ) Dimensions (proj. not included) : 150(W) 40(H) 199.2(D) mm 52932(W)1916(H)72732(D) in Weight (approx.) : 1.3 kg; 2 lb 14 oz (not incl. cable) D TRANSMITTER Modulation system : FM Variable

20、 reactance frequency modulation DV (DIgital) GMSK reactance frequency modulation Output power : 50/15/5 W* (approx.) *25/15/5 W only for the TPE version. Max. frequency deviation : 5.0 kHz (wide) 2.5 kHz (narrow) Spurious emissions : Less than 60 dB Microphone connector : 8-pin modular (600 ) D RECE

21、IVER Receive system : Double conversion superheterodyne Intermediate frequencies : 1st: 46.35 MHz, 2nd: 450 kHz Sensitivity (amateur bands only): FM (12 dB SINAD) Less than 0.18 V DV (BER 1%) Less than 0.35 V Squelch sensitivity (threshold) : Less than 0.13 V Selectivity (typical) : Wide More than 1

22、0 kHz/6 dB Less than 30 kHz/60 dB Narrow More than 6 kHz/6 dB Less than 20 kHz/60 dB DV More than 50 dB Spurious and image rejection : More than 60 dB AF output power (at 13.8 V DC) : More than 2.0 W at 10% distortion with an 8 load Ext. speaker connectors : 3-conductor 3.5 (d) mm (18)/8 Guaranteed

23、144146 or 144148 MHz and 430440 or 440450 MHz ranges only. All stated specifi cations are subject to change without notice or obligation. Version TXRX EUR 144146, 430440 118173.995*1, 230549.995*2, 810999.990*5 ITA 144146, 430434 435438 118173.995*1, 230549.995*3, *4, 810999.990*5 EUR-1 144146, 4304

24、40 144146, 430440 *1Guaranteed 144146 MHz only, *2Guaranteed 430440 MHz only *3Guaranteed 430434 MHz only, *4Guaranteed 435438 MHz only *5Not guaranteed (unit: MHz) (unit: MHz) 2 - 1 SECTION 2. INSIDE VIEWS VHF VCO 2ND IF FILTERS (FI1; LT450HW, FI2; LT450EW) MAIN UNIT MODEM (IC1012) OP+5V REGULATOR

25、(IC1003) AMB_3.2V REGULATOR (IC1004) RESET IC (IC23) D/A CONVERTER (IC8) MODULATION MUTE SWITCH (IC9) AF SW (IC51) MIC MUTE SWITCH (IC30) 1ST IF MIXER CIRCUIT D/A CONVERTER (IC1) EEPROM (IC22) LEVEL CONVERTER (IC46) AF SWITCH (IC13) AF BUFFER (IC49) DIGITAL/ANALOG AF LINE SW (IC11) UHF VCO LEVEL CON

26、VERTER (IC1001) LEVEL CONVERTER (IC26) AF BUFFER (IC1014) AF LPF (IC48) ELECTRIC VR (IC66) IF IC (IC15) COOLING FAN DRIVER (Q123) 1ST IF FILTER (FI6) SQUELCH AMP (IC65) 2 - 2 CONTROL UNIT LCD DRIVER (IC7) +5C REGULATOR (Q16) LCD CONTRAST ADJUSTER (Q15) BACKLIGHT DRIVER (Q1) FRONT CPU (IC4) CPU CLOCK

27、 (9.8304 MHz) (X1) RESET IC (IC2) +5V REGULATOR (IC8) 3 - 1 1. REMOVING TOP AND BOTTOM COVERS 1) Unscrew total of 18 screws; 4 screws from the top cover, 8 screws from the both sides and 4 screws from the bottom cover. 2) Remove the top cover and bottom cover as illustrated below. SECTION 3. DISASSE

28、MBLY INSTRUCTION (Continued to right above.) 2. REMOVING THE MAIN UNIT 1) Remove the IC clip from the chassis. 2) Disconnect the speaker cable from the MAIN UNIT, and remove the speaker from the chassis. Top cover Bottom cover IC clip SPEAKER CABLE Speaker Screw x4 Screw x10 COOLING FAN CABLE UNSOLD

29、ER Solder remover MAIN UNIT Front panel LCD plate CONTROL UNIT Rear panel Screw x4 Knobs Front panel 2. REMOVING THE MAIN UNIT (continued) 3) Unscrew 10 screws from the MAIN UNIT. 4) Unscrew 4 screws from the chassis. 5) Disconnect the cooling fan cable from the MAIN UNIT. 6) Unsolder total of 4 poi

30、nts, and take off the MAIN UNIT. 3. DISASSEMBLE THE CONTROL UNIT 1) Remove 3 knobs from the front panel. 2) Unscrew 4 screws from the rear panel. 3) Remove the LCD plate. 4) Take off the CONTROL UNIT from the front panel. 4 - 1 RF CIRCUITS SECTION 4. CIRCUIT DESCRIPTION LPF HPF BPF RF AMP LPF TX/RX

31、SW BPF BPF HPF RF AMP TX/RX SW RF AMP RX SW BPF BPF RX SW RX SW RF AMP RF AMP RX SW BPF BPF D59,68,75,77 From VHF TX circuit From UHF TX circuit To the 1st IF mixer (Q124) To the 1st IF mixer (Q125) - To the 1st IF mixer (IC64) - To the 1st IF mixer (IC64) D30,53,61,62,177 LIMITER D78,D79D41,D44,D60

32、 Q19 Q33 - 810-999 MHz Q28 - 420-550 MHz - 230-420 MHz Q35 VHFLPF UHFLPF D16 D13 D12,14,23 D56D57,58D45,D51 Q34 D36 D18,D20D9 UHF TX signal - TX AMPLIFIER CIRCUITS (VHF BAND) The output signal of VHF VCO (Q111, D145148) is passed through the LO SW (D155), LPF and ATT, then applied to the drive AMP (

33、Q25) via the limiter (D29), to obtain adequate input level for the power AMP (power MOS-FET module; IC3). The amplifi ed TX signal is power-amplifi ed to 50 W (approx.; 25 W for TPE ver.) of output power (max.) by the power AMP (IC3). The power-amplified TX signal is passed through the LPF which att

34、enuates harmonic components to prescribed level, then applied to the antenna connector via the power detector (D39, 47, 1005), TX/RX SW (D59, 68, 75, 77) and two LPFs. APC CIRCUITS (VHF BAND) A portion of the TX signal from IC3 is rectifi ed at the power detector (D39, 47, 1005), and converted into

35、the DC voltage which is in proportion to the RF power, and applied to the operational amplifi er (IC4, pin 6). IC4 is an APC amplifi er for both of V/UHF bands. The TX power setting voltage “PCON_ V” from the D/A converter (IC1) is applied to the pin 5 as a reference. IC4 is rolled as a differential

36、 amplifier which outputs voltage in inverse proportion to rectifi ed one. When the TX power increased, the rectified voltage also increased, that causes the decrease of output voltage of differential amplifier. The decrease of output voltage of differential amplifi er causes the drop of the gate vol

37、tage of IC3, Thus the TX power maintained to keep stable level. TX AMPLIFIERS (UHF BAND) The output signal of UHF VCO (Q73, D87, 91, 92) is passed through the LO SW (D103), HPF and ATT, then applied to the pre-drive AMP (Q22). The amplifi ed TX signal is applied to the drive AMP (Q26) via the limite

38、r (D25) and amplifi ed to obtain adequate input level for the power AMP (power MOS- FET module; IC2). The amplifi ed TX signal is power-amplifi ed to 50 W (approx.; 25 W for TPE ver.) of output power by the power AMP (IC2). The power-amplified TX signal is passed through the LPF which attenuates har

39、monic components to prescribed level, then applied to the antenna connector via the power detector (D42, 52, 1006), TX/RX SW (D30, 53, 61, 62, 177), HPF and LPF. APC CIRCUITS (UHF BAND) A portion of the TX signal from IC2 is rectifi ed at the power detector (D42, 52, 1006), and converted into the DC

40、 voltage which is in proportion to the RF power, and applied to the operational amplifi er (IC4, pin 2). IC4 is an APC amplifi er for both of V/UHF bands. The TX power setting voltage “PCON_ U” from the D/A converter (IC1) is applied to the pin 3 as a reference. IC4 is rolled as a differential ampli

41、fier which outputs voltage in inverse proportion to rectifi ed one. When the TX power increased, the rectified voltage also increased, that causes the decrease of output voltage of differential amplifier. The decrease of output voltage of differential amplifi er causes the drop of the gate voltage o

42、f IC2, Thus the TX power maintained to keep stable level. 4 - 6 X3 (HPF) LO AMP LPF PLL IC LPF LPF X2 FIL LOOP BUFF BUFF VCO SW VCO SW FIL LOOP ATT LPFATT ATT BUFF ATT - RX LO signals for 300 MHz band (230-420 MHz) - - RX LO signals for 800MHz band (810-999 MHz) - - RX LO signals for 440 MHz band (4

43、20-550 MHz) - - RX LO signals for 140 MHz band (118-174 MHz) - 140 MHz band 1st IF MIXER 440 MHz band 1st IF MIXER 800 MHz and 300 MHz bands 1st IF MIXER Q110,111 D145-148 Q73 D87,91,92 Q52 Q76 Q61,62IC14 IC15 IF IC TCXO 15.3MHz PLLSTB PLLDATA PLLCK X5 45.9 MHz RF SW Q79 IC45 D155 LO SW D102 D101 LO

44、 SW LO SW D103 LO SW LO SW D170 D104 Q124 To VHF TX Aamplifier To UHF TX Aamplifier LO SW D179 LO SW D181 D180 Q125 Q113 D160,D175 Q1015 LO SW VHF VCO UHF VCO IC64 SELECT VCO IC1018 4-3 FREQUENCY SYNTHESIZER VCOs VHF VCO The VHF VCO is composed by the oscillator circuit (Q111, D145, 146, 147) and bu

45、ffer AMP (Q113), and generates both of 1st LO signals and TX signal for VHF band. The VCO oscillating signals are buffer-amplified by Q113, amplifi ed by the LO AMP (IC45) to obtain adequate LO level, then applied to the TX amplifi ers or 1st IF mixer via the LO SW, ATT and fi lter. While transmitti

46、ng; The VCO output signals from the LO AMP (IC45) are applied to the TX amplifi ers via the LO SW (D155) as the TX signal. While receiving; The VCO output signals from the LO AMP (IC45) are passed through the LO SW (D170), ATT and the LPF, then applied to the 1st IF mixer (Q124), as the 1st LO signa

47、ls for 140 MHz band. The VCO output signals from the LO AMP (IC45) are passed through the LO SW (D104), ATT, RF SW and LPF, then applied to the 1st IF mixer (Q125), as the 1st LO signals for 300 MHz band. UHF VCO The UHF VCO is composed by the oscillator circuit (Q73, D87, 91, 92) and buffer AMP (Q7

48、6), and generates both of 1st LO signals and TX signal for UHF band. The VCO oscillating signals are buffer-amplified by Q76, amplifi ed by the LO AMP (IC45) to obtain adequate LO level, then applied to the TX amplifi ers or 1st IF mixer via the LO SW, ATT and fi lter. While transmitting; The VCO ou

49、tput signals from the LO AMP (IC45) are applied to the TX amplifi ers via the LO SW (D103) as the TX signal. While receiving; The VCO output signals from the LO AMP (IC45) are passed through the LO SW (D101), ATT, doubler (HPF) and LPF, then applied to the 1st IF mixer (IC64), as the 1st LO signals for 800 MHz band. The VCO output signals from the LO AMP (IC45) are passed through the LO SW (D179), ATT and the LPF, then applied to the 1st IF mixer (IC