Icom_IC-F5020_series_serv.pdf

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1、S-14524XZ-C1 Feb. 2009 VHF MOBILE TRANSCEIVERS This service manual describes the latest technical information for the IC-F5021 IC-F5022 IC-F5023/H IC-F5026/H IC-F5028H VHF MOBILE TRANSCEIVERS at the time of publication. NEVER connect the transceiver to an AC outlet or to a DC power supply that uses

2、more than specified. This 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 dm (100 mW) to the antenna connector. This could damage the tr

3、ansceivers front-end. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. MODEL VERSION CHANNEL SPACING TX POWER FREQUENCY RANGE F5021USA-0112.5/25.050 W 136174 MHz F5022EUR-01 12.5/20.0/ 25.0 25 W F5023EXP-01 12.5/25.0 F50

4、23HEXP-0250 W F5026RUS-0125 W 146174 MHz F5026HRUS-02 50 W F5028HCHN-01136174 MHz Be sure to include the following four 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.IC TA31136FNG IC-F5

5、021 MAIN UNIT 5 pieces 8820001210 Screw 2438 screw IC-F5023H Top cover 10 pieces Addresses are provided on the inside back cover for your convenience. Icom, Icom Inc. and ICOM logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain

6、, Russia and/or other countries. ORDERING PARTS 1. Make sure that 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

7、. DO NOT short any circuits 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 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 at

8、tenuator between the transceiver and a Deviation Meter or Spectrum Analyzer when using such test equipment. 8. READ the instructions of test equipment throughly before connecting a test equipment to the transceiver. REPAIR NOTES INTRODUCTIONCAUTION UNIT ABBREVIATIONS: F=FRONT UNIT M=MAIN UNIT TABLE

9、OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY INSTRUCTION SECTION 4 OPTIONAL UNIT INSTALLATION SECTION 5 CIRCUIT DESCRIPITON 5-1 RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-

10、2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 5-3 FREQUENCY SYNTHESIZER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 5-4 VOLTAGE DIAGRAM . . . . . . . . . . . . . . .

11、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 5-5 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5 SECTION 6 ADJUSTMENT PROCEDURE 6-1 PREPARATION . . . . . . . . . . . . . .

12、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6-2 FREQUENCY ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 6-3 TRANSMIT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . .

13、. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5 6-4 RECEIVE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6 SECTION 7 PARTS LIST SECTION 8 MECHANICAL PARTS SECTION 9 BOARD LAYOUTS SECTION 10 GENERAL WIRING SECTION 11

14、BLOCK DIAGRAM SECTION 12 VOLTAGE DIAGRAM 1 - 1 SECTION 1. SPECIFICATIONS USA, RUS, CHN, EXPEUR GENERAL Frequency coverage136174 MHz USA, CHN, EXP 146174 MHz RUS 136174 MHz Type of emissionWide16K0F3E (25.0 kHz) Middle14K0F3E (20.0 kHz) Narrow11K0F3E (12.5 kHz)8K50F3E (12.5 kHz) Number of programable

15、 channels128 channels (8 zones) Antenna impedance50 (nominal) Operating temperature range30C to +60C (22F to +140F)25C to +55C Power supply requirement (nominal)13.6 V DC (Negative ground)13.2 V DC (Negative ground) Current drain (approx.) RX Stand-by300 mA Max.audio1200 mA TX at 25 W7.0 A at 50 W14

16、.0 A Dimensions (projections not included) 25 W ver.150 (W) 40 (H) 117.5 (D) mm; (5 29/32 (W) 1 9/16 (H) 4 5/8 (D) in) 50 W ver. 150 (W) 40 (H) 167.5 (D) mm; (5 29/32 (W) 1 9/16 (H) 6 19/32 (D) in) Weight25 W ver.0.8 kg (1 3/4 Ib)0.8 kg 50 W ver.1.1 kg (2 7/16 Ib) TRANSMITTER Transmit output power25

17、 W ver.25 W (High), 10 W (Low2), 2.5 W (Low1) 50 W ver.50 W (High), 25 W (Low2), 5.0 W (Low1) ModulationVariable reactance frequency modulation Max. permissible deviationWide5.0 kHz Middle4.0 kHz Narrow2.5 kHz Frequency error2.5 ppm1.5 kHz Spurious emission70 dB typ.0.25 W (1 GHz), 1.0 W (1 GHz) Adj

18、acent channel powerWide70 dB min. Middle70 dB min. Narrow60 dB min. Audio frequency response+1 dB to 3 dB of 6 dB/octave (from 5002500 Hz) Audio harmonic distortion3% typ. (with 1 kHz AF 40% deviation) FM hum and noise (without CCITT filter) WideMore than 40 dB (46 dB typ.) NarrowMore than 34 dB (40

19、 dB typ.) Residual modulation (with CCITT filter) WideMore than 45 dB (55 dB typ.) MiddleMore than 43 dB (53 dB typ.) NarrowMore than 40 dB (50 dB typ.) Limiting charact of modulation70100% of max. deviation Microphone impedance600 1 - 2 USA, RUS, CHN, EXPEUR RECEIVER Receive systemDouble-conversion

20、 superheterodyne Intermediate frequencies1st IF; 46.35 MHz, 2nd IF; 450 kHz Sensitivity0.25 V typ. at 12 dB SINAD4 dBV (EMF) typ. at 20 dB SINAD Squelch sensitivity (at threshold)0.25 V typ.4 dBV (EMF) typ. Adjacent channel selectivity WideMore than 70 dB (75 dB typ.) Other than RUS 82 dB typ. RUS M

21、iddleMore than 70 dB (75 dB typ.) NarrowMore than 60 dB (65 dB typ.) Spurious response70 dB min. IntermodulationMore than 70 dB (75 dB typ.)More than 65 dB (67 dB typ.) FM hum and noise (without CCITT filter) WideMore than 40 dB (45 dB typ.) NarrowMore than 34 dB (40 dB typ.) Residual modulation (wi

22、th CCITT filter) WideMore than 45 dB (55 dB typ.) MiddleMore than 43 dB (53 dB typ.) NarrowMore than 40 dB (50 dB typ.) Audio output power4.0 W typ. at 5% distortion with a 4 load Audio output impedance4 2 - 1 SECTION 2. INSIDE VIEWS FRONT UNIT (TOP VIEW) CPU (IC1) LCD DRIVER (IC6) TONE LPF (IC5) TO

23、NE FILTER SWITCH (Q3) EEPROM (IC3) CLOCK FREQUENCY SHIFT DIODE (D6) BACKLIGHT CONTROLLER (Q5)DIMMER CONTROLLER (Q2) BACKLIGHT DRIVER (Q1) RESET IC (IC2) 2 - 2 MAIN-A UNIT (TOP VIEW) IF IC (IC1) LPF (Q39) PLL IC (IC4) CPU5 LINE REGULATOR (IC10) RIPPLE FILTER (Q17) VCO SWITCH (Q15) POWER SWITCH (Q23)

24、+8 REGULATOR (IC9) LOCK VOLATGE BUFFER (Q18) WIDE/NARROW PHASE SHIFTER SWITCH (Q5) R8 REGULATOR (Q30) POWER SWITCH (Q24) APC AMP (IC2) WIDE/NARROW 2ND IF FILTER SWITCH (Q40) 1ST IF FILTER (FI1) 2 - 3 VCO MAIN-A UNIT (BOTTOM VIEW) AF/TONE FILTER (IC16) AF POWER AMP (IC8) AF MUTE SWITCH (Q35, Q36) Ext

25、. MODULATION LINE SWITCH (Q31) REFERENCE FREQUENCY OSCILLATOR (X2) REFERENCE OSCILLATOR MODULATION AMP (IC19) D/A CONVERTER (IC18) AF PRE-AMP (IC15) EXPANDER (IC17) ANALOG SWITCH (IC14) D/A CONVERTER (IC20) DRIVE AMP (Q9) RF AMP (Q9) 1ST MIXER (Q3) 2ND IF FILTER (FI2) 2ND IF FILTER (FI6) +5V REGULAT

26、OR (Q27,Q28) T8 REGULATOR (Q25) 3 - 1 SECTION 3. DISASSEMBLY INSTRUCTION FLAT CABLE TOP COVER FRONT PANEL SPEAKER CABLE MAIN UNIT UNSOLDER Solder remover MAIN UNIT MAIN UNIT 1) Unscrew 4 screws from the top cover, and remove the top cover. 2) Disconnect the fl at cable and speaker cable. 3) Unscrew

27、2 screws from the both sides, and remove the front panel in the direction of the arrow. 5) Unscrew 9 screws from the MAIN UNIT. 6) Unsolder total of 9 points; 3 points at the antenna connector, 6 points at the PA module. 7) Take off the MAIN UNIT from the CHASSIS. 4 - 1 SECTION 4 OPTIONAL PRODUCTS I

28、NSTALLATION Install optional UT-108 as follows; 1) Turn the transceiver OFF, then disconnect the DC cable. 2) Unscrew 4 screws, then remove the bottom cover. 3) Install the unit as shown below. 4) Recover the bottom cover, screws and DC power cable. Install optional OPC-1939 as follows; 1) Turn the

29、transceiver OFF, then disconnect the DC power cable. 2) Unscrew 4 screws, then remove the bottom cover. 3) Install the cable as shown below. Install optional UT-109R or UT-110R as follows; 1) Turn the transceiver OFF, then disconnect the DC power cable. 2) Unscrew 4 screws, then remove the bottom co

30、ver. 3) Cut the pattern on the PCB at MIC and DISC as showon below. 4) Install the unit as shown below. 5) Recover the bottom cover, screws and DC power cable. OPC-1939 Cut off the bushing as in the illustration, when you install the optional OPC-1939. K I MIC DISC 4) Cut or short the patterns as be

31、low. (For AF output) 6) Recover the bottom cover, screws and DC power cable. NOTE: Be sure to recover the patterns when you remove the optional product. Otherwise no TX modulation or AF output is available. Solder remover D 5) Short the pattern as below. (For modulation input) 5 - 1 1ST IF CIRCUITS

32、The RX signals from the BPF are mixed with the 1st LO signals to be converted into the 46.35 MHz 1st IF signal. The 1st LO signals are generated by the RX VCO (Q14, D33, D34, L26, L39, etc.), and passed through the LO SW (D15) and attenuator, then applied to the 1st mixer (Q3) The converted 1st IF s

33、ignal is filtered by the crystal filter (FI1) and amplified by the 1st IF AMP (Q4), then applied to the IF IC (IC1). 5-1 RECEIVER CIRCUITS RF CIRCUITS RF signals from the antenna are passed through the LPF (as the harmonic filter for transmitting) and antenna SW, then applied to the RX BPF circuit.

34、The applied RX signals are passed through the 2-staged tuned BPF (D4, D8) to remove unwanted out-of-band signals, and amplified by the low-noise RF AMP (Q2), then applied to the 1st mixer (Q3) via another 2-staged tuned BPF (D9, 10). Total of 4 stage BPF are tuned to the RX frequency by the tuning v

35、oltage “T1” and “T2” from the D/A converter (IC20), to obtain required IMD characteristic. 2ND IF AND DEMODULATOR CIRCUITS The amplified 1st IF signal is mixed with the 2nd LO signal at the internal 2nd IF mixer of the IF IC (IC1), to obtain the 450 kHz 2nd IF signal. The 15.3 MHz signal generated b

36、y the reference oscillator (X2) is passed through the filter AMP (Q34, L33, 35, C305 308) to extract the 45.9 MHz 3rd harmonic component. The 45.9 MHz signal is then applied to pin 2 of IF IC (IC1) as the 2nd LO signal. The converted 2nd IF signal is output from pin 3 of IF IC (IC1), and filtered by

37、 the ceramic filters (FI2 and FI6 for Narrow mode; FI2 only for Wide mode) to remove unwanted out-of-band signals, then applied to the internal frequency- demodulator of IF IC (IC1) from pin 5. The demodulator is a quadrature type which uses X1 as the phase shifter. The frequency-demodulated AF sign

38、als are output from pin 9 to AF circuits. RF CIRCUITS 2ND IF AND DEMODULATORCIRCUITS 1ST IF CIRCUITS SECTION 5. CIRCUIT DESCRIPTION LPFLPF PWR DET D1,D11 ANT SW D2,3,5,6,48 BPF D10 BPF D9 BPF D4 BPF D8 RF AMP Q2 AGC Q1 Tuning voltage “T2” To 1st IF circuits Tuning voltage “T1” 136-174 MHz RSSI From

39、the TX AMP TX/RX SW D15 Q3 1st mixer BPF XTAL FI1 IF AMP Q4 LPF From RF circuits To IF IC 46.35 MHz 1st LO signals (182.35 MHz-220.35 MHz) REFX2 X3Q34 X1 BPF BPF CERAMIC FI6 W/N SW Q5 BPF CERAMIC FI2 W/N SW D56Q40 W/N SW D57 D/A IF IC From 1st IF circuits IC1:TA31136FN IC18 AK2330 NWC 15.3MHz 45.9MH

40、z DISC SQIN 450kHz To the AF circuits NWC 5 - 2 RX AF CIRCUITS AF CIRCUITS The demodulated AF signals from the IF IC (IC1) are amplified and filtered by the HPF (IC16), and passed through the AF line SW (IC14) and LPF (IC16). The filtered AF signals are adjusted its level (=loudness) by the D/A conv

41、erter (IC18), and applied to the AF AMP (IC15) via the AF line SW (IC14). The amplified AF signals are applied to the AF power AMP (IC8) and power-amplified to obtain AF output level. The power-amplified AF signals are applied to the internal speaker on the FRONT UNIT or output from the external spe

42、aker jack on the rear panel. SIGNALING (DECODING) Demodulated signals from pin 9 of the IF IC (IC1) are passed through the LPF to extract tone signals contained in the demodulated signals. 2/5 tone signals are extracted by the LPF (IC16). CTCSS/ DTCS signals are extracted by the LPF (Q39). These ext

43、racted tone signals are applied to the CPU (FRONT UNIT: IC1) for decoding. LPF IC16 LPF IC16 LPF Q39 HPF IC16 AF AMP IC15 AF POWER AMP IC8 LA4425A AF MUTE Q35,36,D29 Int. speaker Ext. speaker jack J4 ANALOG SW SDEC To CPU (FRONT UNIT: IC1) CDEC IC14 CD4066 D/A IC18 AK2330 (2/5 TONE signals) (TCSS/DT

44、CS signals) FRONT UNIT AF ON DISC From the IF IC DISC DISC VRAFTMONI RXAF TX AF CIRCUITS MODULATION CIRCUITS TX AMPLIFIERS APC CIRCUIT 5 - 3 5-2 TRANSMITTER CIRCUITS MIC AMPLIFIER (FRONT UNIT) Audio signals from the connected microphone are applied to the MIC AMP (IC5) via the microphone connector (

45、J1). The amplifi ed MIC signals are applied to the MAIN UNIT. TX AF CIRCUITS The MIC signals from the FRONT UNIT are passed through the D/A converter (as a MIC gain controller; IC18) for level adjustment, and applied to the limiter AMP which is also rolled to the pre-emphasis circuit (IC16). MIC MUT

46、E SWITCH The pre-emphasized MIC signals are passed through the MIC mute SW (IC14). While receiving, the MIC mute SW (IC14) cuts the MIC line off, and is controlled by “MMUT” signal from the expander (IC17). SPLATTER FILTER The MIC signals from the MIC mute SW (IC14) are applied to the splatter fi lt

47、er (IC16). The splatter filter (IC16) is also used as the AF Summing AMP for tone signals modulation (CTCSS, 2/5 TONE). MODULATION CIRCUIT MIC signals from the splatter filter (IC16) is level-adjusted (=deviation adjustment) by the D/A converter (IC18), and applied to the TX VCO (Q13, D16, 31) via m

48、odulation mute SW (IC14) as the modulation signals. The MIC signals are also applied to the reference frequency oscillator (X2) as the modulation signals via D/A converter (IC18) and REF AMP (IC19). CTCSS/DTCS SIGNALS ENCODING (FRONT UNIT) The CTCSS/DTCS encoding signals from the CPU (IC1) “CENC0CEN

49、C2” are passed through the LPF (IC5) for waveform conversion, and applied to the MAIN UNIT as tone modulation signals. 2/5 TONE, DTMF ENCODING (FRONT UNIT) Encoding signal from the CPU (IC1) named “SENC” is passed through the LPF (IC5), and applied to the MAIN UNIT as tone modulation signals. TX AMPLIFIERS The frequency-modulated signal from the TX VCO is buffer- amplifi ed by two buffers (Q11 and Q10), and applied to the drive AMP (Q9) as the TX signal via the LO SW (D14). The ampl