Icom IC-R20 Service Manual

Icom IC-R20 Manual

Get Icom IC-R20 PDF manuals and user guides View all Icom IC-R20 manuals
Add to My Manuals
Save this manual to your list of manuals

Icom IC-R20 manual content summary:

  • Icom IC-R20 | Service Manual - Page 1
    SERVICE MANUAL COMMUNICATIONS RECEIVER iC-r20
  • Icom IC-R20 | Service Manual - Page 2
    INTRODUCTION This service manual describes the latest service information for the IC-R20 COMMUNICATIONS RECEIVER at the time of publication. This service manual covers each versions. MODEL VERSION [USA], [EXP-01], [CAN] AC adapter BC-149A IC-R20 [EUR], [EXP-02] BC-149D [UK], [SEA] - To
  • Icom IC-R20 | Service Manual - Page 3
    TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY INSTRUCTIONS SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4 - 1 4-2 PLL CIRCUITS 4 - 7 4-3 OTHER CIRCUITS 4 - 10 4-4 POWER SUPPLY CIRCUITS 4 - 11 4-5 PORT ALLOCATIONS 4 - 12 4-6 BC-156 CIRCUIT
  • Icom IC-R20 | Service Manual - Page 4
    1 SPECIFICATIONS • IC-R20 M GENERAL • Frequency coverage : Version [EUR], [UK], [SEA], [CAN] [EXP-01], [EXP-02] Receive coverage 25, 30, 50 and 100 kHz *selectable depending on the operating frequency band. • Antenna Impedance : 50 Ω • Power supply requirement : 3 × AA(R6) alkaline cells,
  • Icom IC-R20 | Service Manual - Page 5
    • BC-156 • Input voltage • Charging current • Usable temperature • Timer device • Protect function FUNCTION Over discharge Over charge Overcurrent Full charge Normal charging : 8.0-16.0 V : 0.96-1.44 A (Rapid charging) : 0˚C to +35˚C (+32˚F to +95˚F) : 192-288 minutes (Rapid charging) 12-18 minutes
  • Icom IC-R20 | Service Manual - Page 6
    , D116: RB876W) B-BAND 2nd IF amplifier (Q542: 2SC5006) B-BAND FM IF IC (IC17: TA31136FN) B-BAND 3rd Lo amplifier (Q555: 2SC5006) SSB IF amplifier 450 BAND 2nd mixer (IC10: PC2757TB) A-BAND 3rd Lo amplifier (Q540: 2SC5006) A-BAND IF IC (IC2: TA31136FN) A-BAND 2nd IF filter (19.65 MHz) (FI3: FL-293)
  • Icom IC-R20 | Service Manual - Page 7
    view LCD (DS12: M3-0243TIY) +3 regulators (Q10, Q15: 2SA1362) Reset IC (IC2: BD5228G) B-BAND AF circuit Q24: XP6501, Q27: 2SJ144, Q22: 2SC4617, IC7: SM6451B +3V reg. (Q17: 2SA1588) +3SC reg. (Q13: XP6501) +3S reg. (Q14: 2SA1588) Battery daging regulators (Q30: 2SB1201, Q32: 2SC4617, Q33: 2SB1132
  • Icom IC-R20 | Service Manual - Page 8
    SECTION 3 DISASSEMBLY INSTRUCTIONS (1) REMOVING THE REAR PANEL q Unscrew 4 screws, A (2 × 115 mm, black). w Unscrew 2 screws, B (2 × 8 mm, black). e Unplug W1 and J8 (LOGIC unit) to separate the front and the
  • Icom IC-R20 | Service Manual - Page 9
    * (D69). The signals are then applied to the antenna switching circuit (D3, D11, D13, D65, D66 and D73-D75 ). *Above 2 GHz RF signals do not pass through the attenuator. 4-1-2 RF CIRCUIT (RF UNIT) The RF circuit amplifies the received signals within the range of frequency coverage and filters out
  • Icom IC-R20 | Service Manual - Page 10
    C22 and C23), and are then amplified at the pre-amplifier (Q551) which is controlled by "A_VHF3V" signal via the D151. The amplified signals are applied to the MIXER AND 1ST IF CIRCUITS (RF UNIT) The 1st mixer circuit converts the received RF signals to a fixed frequency of the 1st IF signal with a
  • Icom IC-R20 | Service Manual - Page 11
    11) via the "A_DETFM" line, and are then applied to the AF circuit (LOGIC unit) as "A_DET" signal. (2) WFM MODE The 3rd IF signal is output from the FM IF IC characteristics of pin 12, "RSSI", change gradually. Therefore, the FM IF IC can detect WFM components. • 1ST, 2ND MIXER AND 2ND IF CIRCUITS
  • Icom IC-R20 | Service Manual - Page 12
    (4) SSB/CW MODES The 3rd IF signal is output from the FM IF IC (IC2, pin 3), and passes through the mode switch (D110) and ceramic bandpass 5). The amplified signal is demodulated at the quadrature detector section (pins 10 and 11) and detector coil (L105). The AF signals are output from pin 9 and
  • Icom IC-R20 | Service Manual - Page 13
    The signals are applied to the electronics volume (IC7, pin 11) to control volume level after passing through the mute switch (Q19). The received. By detecting noise components in the AF signals, the squelch circuit switches the AF mute switch. A portion of the "A_NOISE" signals from the FM IF IC
  • Icom IC-R20 | Service Manual - Page 14
    voltage increases and the AGC voltage decreases. Therefore, the receiver obtain stable receiver gain. 4-1-10 IC RECORDER CIRCUIT (LOGIC UNIT) The IC RECORDER circuit is composed of RECORDER IC (IC7), sub CPU (IC2), flash memory (IC6), USB interface (IC3), etc. (1) IN CASE OF RECORDING • A-BAND
  • Icom IC-R20 | Service Manual - Page 15
    divided VCO frequency to the reference frequency. The PLL output frequency is controlled by the divided ratio (N-data) of a programmable divider. • A-BAND is applied to the PLL IC (IC3, pin 11) and is prescaled in the PLL IC based on the divided ratio (N-data). The PLL IC detects the out-of-step
  • Icom IC-R20 | Service Manual - Page 16
    A portion of the signal from the buffer amplifier (IC2) is amplified at the buffer amplifier (Q8) and is then fed back to the PLL IC (IC3, pin 11) as the comparison signal. • B-BAND CIRCUIT (1STBVCO BOARD) The oscillated signal at 1st B-VCO circuits is applied to the buffer amplifiers (IC2) via one
  • Icom IC-R20 | Service Manual - Page 17
    REF CONT. Q556 REF OSC Q540 19.2 MHz 3rd LO signal LO FM IF IC (IC2) to the demodulator circuits 3rd mixer 2nd IF signal • DOWN CONVERTER VCO amplified at the buffer amplifier (Q4), and passes through band switch. When receiving 1305-2305.999 MHz RF signals, 1001 MHz LO signal is selected.
  • Icom IC-R20 | Service Manual - Page 18
    is applied to the battery charger controller (Q34), and its output controls the battery charger circuit (Q31, D28, D29) to output 400 mA (typical) charging current. 4-3-2 BAR ANTENNA TUNING CIRCUIT (RF UNIT) When selecting the internal bar antenna while AM band signals are receiving, the interal bar
  • Icom IC-R20 | Service Manual - Page 19
    voltage is same as connected battery pack. The voltage is supplied to the charge controller (Q32). CPU3V Common 3 IC (IC20, pin 3). B_G3V Receive 3 V converted from the B_R3V line by the +3 regulator (Q503). The regulator is controlled by the B_GC line from the expander IC (IC20, pin 4). Receive
  • Icom IC-R20 | Service Manual - Page 20
    . Outputs B-BAND power supply circuit 75 B_R3C control signal. Low : While B-BAND receiving. 76 LCD_RESET Outputs reset signal to the LCD. 77 LCD_RS Outputs command and data signals to the LCD. Outputs strobe signals to the expander 78 LD2 IC (RF unit; IC20, pin 15). 79-81 B_VCO2 B_VCO3
  • Icom IC-R20 | Service Manual - Page 21
    Input port for the USB reset signal. 19 PWREN Input port for the USB suspend signal. 24 antenna select signal. High : The bar antenna is selected. Outputs the power save control signal to the A-BAND circuit. 11 at the A-BAND circuit. 4-5-5 D/A CONVERTER IC PORT ALLOCATIONS (RF UNIT; IC20) Pin
  • Icom IC-R20 | Service Manual - Page 22
    board) to control battery charging. 4-6-3 CHARGING CONTROL CIRCUIT (MAIN UNIT AND TANSHI BOARD) • CHARGING THE BATTERY WITH IC-R20 The "DET2" CHARGING CONTROL CIRCUIT 5.2 V/2 A from the DC/DC converter circuit D1 Q1 "CHGOUT" signal to the charger selector (RL1) Q2 Charging Q3 controller Q4
  • Icom IC-R20 | Service Manual - Page 23
    value. Write the AFC ADJUSTMENT value. Write the TRACKING ADJUSTMENT value. Write the S-METER ADJUSTMENT value. ' CONNECTIONS Standard signal generator to the antenna connector 0.1 V to 32 mV ( 127 dBm to 17 dBm) JIG Shorten I/O and GND line. 3.5(d) mm I/O GND 3-conductor 3.5(d) mm plug must be
  • Icom IC-R20 | Service Manual - Page 24
    as B. • Push [• LOCK] key. [USB-IFS] 3 • Connect an SSG to the antenna connector and set as • Set an SSG's level to 10 dB S/N sensitivity (A). Frequency : 14.1010 MHz • Measure the AF output level while the IC-R20 Modulation : OFF outputs 1 kHz signal (B). • Receiving 4 • Set an SSG as
  • Icom IC-R20 | Service Manual - Page 25
    • RF UNIT BOTTOM VIEW • RF UNIT TOP VIEW L105 Center voltage adjustment (B-BAND) CP11 Center voltage check point (B-BAND) L21 Center voltage adjustment (A-BAND) CP1 Center voltage check point (A-BAND) • BFO CHECK POINT (LOGIC UNIT TOP VIEW) CP18 Reference frequency check point BFO check point 5
  • Icom IC-R20 | Service Manual - Page 26
    key. RF amplifier Frequency : 330.1 MHz tuning) • Receiving (469.9 MHz 10 • Connect an SSG to the antenna connector and set as • Push [8 SET] key. RF amplifier Frequency : 469.9 MHz tuning) • Receiving (470.1 MHz 11 • Connect an SSG to the antenna connector and set as • Push [8 SET] key
  • Icom IC-R20 | Service Manual - Page 27
    81 MHz FM mode) 1 • Mode : FM • Push [8 SET] key. • Connect an SSG to the antenna connector and set as Level : 0.56 µV* (-112 dBm) Frequency : 1.81 MHz Modulation : ±1 kHz Deviation : ±3.5 kHz • Receiving (1.81 MHz 2 • Mode : WFM • Push [8 SET] key. WFM mode) • Connect an SSG to the
  • Icom IC-R20 | Service Manual - Page 28
    ADJUSTMENT CONDITION OPERATION S-METER 11 • Mode : FM • Push [8 SET] key. [S-M] • Connect an SSG to the antenna connector and set as (1400.1 MHz Level : 0.56 µV* (-112 dBm) FM mode) Frequency : 1400.1 MHz Modulation : ±1 kHz Deviation : ±3.5 kHz • Receiving (1400.1 MHz 12 • Mode
  • Icom IC-R20 | Service Manual - Page 29
    SOFTWARE ADJUSTMENTS-Continued ADJUSTMENT ADJUSTMENT CONDITION OPERATION S-METER 21 • Mode : FM • Push [8 SET] key. [S-M] • Connect an SSG to the antenna : ±3.5 kHz • Receiving (2510.1 MHz 22 • Mode : WFM • Push [8 SET] key. WFM mode) • Connect an SSG to the antenna connector and set as
  • Icom IC-R20 | Service Manual - Page 30
    [USA], [CAN] B ERJ2GE-JPW [SEA], [EXP-01], [EXP-02] B ERJ2GEJ 102 X (1 kΩ) [EUR], [UK], [USA], [CAN] B ERJ2GE-JPW [SEA], [EXP-01], [EXP-02] B ERJ2GEJ 102 X (1 kΩ) [EUR], [UK], [USA], [CAN] B ERJ2GE-JPW [SEA], [EXP-01], [EXP-02] B C1 4030017460 S.CERAMIC ECJ0EB1E102K T C2 4030017460
  • Icom IC-R20 | Service Manual - Page 31
    S.IC µPC2746TB-E3 B IC3 1130011660 S.IC MB15T61ULPVA UK], [USA], [CAN] B ERJ2GE-JPW [SEA], [EXP-01], [EXP-02] B ERJ2GEJ 102 X (1 kΩ) [EUR], [UK], [USA], [CAN] B ERJ2GE-JPW [SEA], [EXP-01], [EXP-02] B ERJ2GEJ 102 X (1 kΩ) [EUR], [UK], [USA], [CAN] B ERJ2GE-JPW [SEA], [EXP-01], [EXP
  • Icom IC-R20 | Service Manual - Page 32
    S.CERAMIC ECJ0EC1H020B T C68 4030017460 S.CERAMIC ECJ0EB1E102K [EUR], [UK], [USA], [CAN] only B J1 6910010840 CONNECTOR IMSA- Bottom side) [2NDDVCO BOARD] REF ORDER NO. NO. IC1 1130011670 S.IC DESCRIPTION M. MB15E03SLPFV1-G-BND-ER B Q1 1530003610 S.TRANSISTOR FH102-TL T Q3
  • Icom IC-R20 | Service Manual - Page 33
    T except [EUR], [UK] T B 7030009160 S.RESISTOR ERJ2GEJ 181 X (180 Ω) [EUR], [UK] T R2 7030005000 S.RESISTOR 7030009270 S.RESISTOR ERJ2GEJ 821 X (820 Ω) B T R20 7030005530 S.RESISTOR ERJ2GEJ 100 X (10 Ω) B T M. IC2 1110005120 S.IC IC3 1110005230 S.IC IC4 1130011670 S.IC µPC2749TB-E3 T
  • Icom IC-R20 | Service Manual - Page 34
    1130011980 S.IC 1140012090 S.IC 1130011680 S.IC 1130012250 S.IC 1130012260 S.IC 1130011970 S.IC 1190001950 S.IC 1130011800 S.IC 1130011800 S.IC 1180002370 330 kΩ) T R19 7030005240 S.RESISTOR ERJ2GEJ 473 X (47 kΩ) T R20 7030004980 S.RESISTOR ERJ2GEJ 101 X (100 Ω) B R21 7030005090 S.RESISTOR
  • Icom IC-R20 | Service Manual - Page 35
    EXP-02], [CAN] only B D3 1750000940 S.DIODE ISS400 TE61 T D5 1790001240 S.DIODE MA2S728-(TX) [USA] only B D6 1750000940 S.DIODE ISS400 TE61 T D8 1790001240 S.DIODE MA2S728-(TX) [UK R19 7030005570 S.RESISTOR ERJ2GEJ 820 X (82 Ω) T R20 7030005090 S.RESISTOR ERJ2GEJ 104 X (100 kΩ) B R21
  • Icom IC-R20 | Service Manual - Page 36
    [LOGIC UNIT] REF ORDER NO. NO. DESCRIPTION M. R127 7030005170 S.RESISTOR ERJ2GEJ 474 X (470 kΩ) B R128 7030008300 S.RESISTOR ERJ2GEJ 184 X (180 kΩ) B R129 7030008300 S.RESISTOR ERJ2GEJ 184 X (180 kΩ) B R130 7030008300 S.RESISTOR ERJ2GEJ 184 X (180 kΩ) B R131 7030009150 S.RESISTOR
  • Icom IC-R20 | Service Manual - Page 37
    [LOGIC UNIT] REF ORDER NO. NO. DESCRIPTION M. C77 4030017460 S.CERAMIC ECJ0EB1E102K B C78 4030017490 S.CERAMIC C1608 JB 1A 105K-T B C79 4030017490 S.CERAMIC C1608 JB 1A 105K-T B C80 4550006700 S.TANTALUM ECST1AY106R B C81 4030017490 S.CERAMIC C1608 JB 1A 105K-T B C82 4550006620 S.
  • Icom IC-R20 | Service Manual - Page 38
    1110005230 S.IC µPC2757TB-E3 T IC2 1110003200 S.IC TA31136FN (EL) T IC10 1110005230 S.IC µPC2757TB-E3 T IC12 1130011770 S.IC CD4066BPWR B IC14 1110006360 S.IC M62366GP D60J T IC15 1110005230 S.IC µPC2757TB-E3 T IC16 1110005230 S.IC µPC2757TB-E3 T IC17 1110003200 S.IC TA31136FN
  • Icom IC-R20 | Service Manual - Page 39
    S.RESISTOR ERJ2GEJ 473 X (47 kΩ) T R18 7030007340 S.RESISTOR ERJ2GEJ 153 X (15 kΩ) T R19 7030005240 S.RESISTOR ERJ2GEJ 473 X (47 kΩ) T R20 7030007280 S.RESISTOR ERJ2GEJ 331 X (330 Ω) T R26 7030005240 S.RESISTOR ERJ2GEJ 473 X (47 kΩ) B R28 7030005160 S.RESISTOR ERJ2GEJ 105 X (1 MΩ) B R29
  • Icom IC-R20 | Service Manual - Page 40
    X (10 Ω) B R534 7030011150 S.RESISTOR ERJ2GEJ 2R7 X (2.7 Ω) B R536 7030003290 S.RESISTOR ERJ3GEYJ 560 V (56 Ω) T R537 7030003290 S.RESISTOR ERJ3GEYJ 560 V (56 Ω) T R538 7030010040 S.RESISTOR ERJ2GE-JPW B S.=Surface mount 6 - 11
  • Icom IC-R20 | Service Manual - Page 41
    [RF UNIT] REF ORDER NO. NO. DESCRIPTION M. R539 7030005300 S.RESISTOR ERJ2GEJ 150 X (15 Ω) B R540 7030005300 S.RESISTOR ERJ2GEJ 150 X (15 Ω) B R541 7030007270 S.RESISTOR ERJ2GEJ 151 X (150 Ω) T R542 7030007340 S.RESISTOR ERJ2GEJ 153 X (15 kΩ) T C5 4030017730 S.CERAMIC ECJ0EB1E471K T
  • Icom IC-R20 | Service Manual - Page 42
    [RF UNIT] REF ORDER NO. NO. DESCRIPTION M. C674 4030017420 S.CERAMIC ECJ0EC1H470J B C676 4030017400 S.CERAMIC ECJ0EC1H220J T C677 4030017350 S.CERAMIC ECJ0EC1H020B T C678 4030017460 S.CERAMIC ECJ0EB1E102K T C679 4030017460 S.CERAMIC ECJ0EB1E102K T C683 4030017460 S.CERAMIC
  • Icom IC-R20 | Service Manual - Page 43
    JUMPER W2 7120000470 JUMPER ERDS2T0 ERDS2T0 EP1 0910058144 PCB EP2 3310003010 ANTENNA B 6078D KY-058-006-2 6-2 BC-156 T REF ORDER NO. NO. DESCRIPTION M. T IC1 1110005090 S.IC MM1433EVBE T IC2 1110006250 S.IC NJM2360AM-TE3 T Q1 1520000600 S.TRANSISTOR 2SB1184 TL Q T Q2
  • Icom IC-R20 | Service Manual - Page 44
    [MAIN UNIT] REF ORDER NO. NO. DESCRIPTION M. C10 4030006860 S.CERAMIC C1608 JB 1H 102K-T T C12 4510004590 ELECTROLYTIC 16 MV 470 HC T C13 4030006860 S.CERAMIC C1608 JB 1H 102K-T T C14 4030006860 S.CERAMIC C1608 JB 1H 102K-T T C15 4030006860 S.CERAMIC C1608 JB 1H 102K-T T C16
  • Icom IC-R20 | Service Manual - Page 45
    2699 battery cover 1 MP4 8310061220 2699 lock plate 1 MP5 8930062400 2699 jack cap 1 MP6 8930062410 2699 USB ACCESSORIES] REF. NO. ORDER NO. DESCRIPTION QTY. EP1 3310002670 Antenna FA-B04RE 1 EP2 0800005460 Battery BP-206 ACC except [SEA] 1 EP3 0800006350 AC adapter BC-149A [USA], [EXP
  • Icom IC-R20 | Service Manual - Page 46
    4.2 (5/32) 2 (3/32) 34.8 (4 3/8) 0.9 (1/8) 1 (1/32) 58 (2 1/32) 1 (1/32) Unit; mm (inch) 32.9 (1 9/32) 33.9 (1 11/32) 14.8 (19/32) MP2 (L) MP30 (C) MP29 (C) 140 (5 9/16) 157 (6 3/16) MP7 (C) MP19 (C) S24 (L) MP35 (C) DS12 (L) MP4 (L) LOGIC UNIT MP3 (L) MP32 (C) MP31 (C) MP2 (D) DOWNCONV
  • Icom IC-R20 | Service Manual - Page 47
    : B1184) B C E 2SJ377 (Symbol: 4L) D G D S G S DTA114EE TL (Symbol: 14) B C E DTC114EE TL (Symbol: 24) B C E UNR9214J-(TX) (Symbol: 8D) B C E • DIODES IC-R20 1SS372 (Symbol: N9) C A DAP222 TL (Symbol: P) C1 A1 C2 HVC417CTRU (Symbol: A8) A C MA2S728 (Symbol: B) 1SV172 (Symbol: BE
  • Icom IC-R20 | Service Manual - Page 48
    SECTION 9 BOARD LAYOUTS 9-1 RF UNIT • TOP VIEW to LOGIC UNIT J5 21 40 B_DET B_R3V GND B_NOISE B_RSSI +3V GND PLLBSTB PLLDSTB VP GND PLLESTB PLLCSTB PLLASTB RFO A_DET A_R3V GND A_NOISE A_RSSI LD2 +3S GND B_VCO2 B_VCO3 B_VCO4 PLLCK PLLDATA STR2 HFC B1C B2C B3C D CLK LD1 EAR A_VCO1 A_VCO2 GND 20
  • Icom IC-R20 | Service Manual - Page 49
    RF UNIT • BOTTOM VIEW to DOWNCONV BOARD J1 8 RF_IN GND OSC PLLCK HJ10 PLLDATA PLLESTB GND 1 IF_OUT to DOWNCONV BOARD J2 6 +3S +3V DOWN_CONV HJ11 2GLO 1GLO 1 GND to 1STBVCO BOARD J2 1 +3V to 1STBVCO BOARD J1 B_R3V 1 VP B_VCO1 GND B_VCO2 PLLBSTB B_VCO3 PLLDATA B_VCO4 PLLCK
  • Icom IC-R20 | Service Manual - Page 50
    UNIT J7 9 - 3 The combination of this page and the next page shows the unit layout in the same configuration as the actual P.C. Board. Li-ion Battery - + CP2 CP1 CP4 CP3
  • Icom IC-R20 | Service Manual - Page 51
    LOGIC UNIT • BOTTOM VIEW The combination of this page and the previous page shows the unit layout in the same configuration as the actual P.C. Board. 21 J8 1 AFOUT W18 + 2 GND W19 - SP 9 - 4
  • Icom IC-R20 | Service Manual - Page 52
    9-3 REC UNIT • TOP VIEW to LOGIC UNIT HJ8 4 GND AOUT B_AIN 1 A_ATN J6 VL DOWN VL UP The combination of this page and the next page shows the unit layout in the same configuration as the actual P.C. Board. SQL 9 - 5 USB J7 1 +3V SUB_3C VOL_UP_DOWN SQL CPU_TX 6 CPU_RX to LOGIC UNIT HJ9
  • Icom IC-R20 | Service Manual - Page 53
    REC UNIT • BOTTOM VIEW The combination of this page and the previous page shows the unit layout in the same configuration as the actual P.C. Board. 9 - 6
  • Icom IC-R20 | Service Manual - Page 54
    9-4 1STAVCO BOARD • TOP VIEW 9-5 1STBVCO BOARD • TOP VIEW 9 - 7 9-6 2NDCVCO BOARD • TOP VIEW to RF UNIT HJ5 J1 A_R3V GND APS C_VCO_OUT GND 1 5 to RF UNIT HJ4 J2 OSC GND +3V PLLCK PLLDATA PLLDSTB 6 1 9-7 2NDDVCO BOARD • TOP VIEW to RF UNIT HJ9 J1 B R3V GND BPS D_VCO_OUT GND 1 5 to RF
  • Icom IC-R20 | Service Manual - Page 55
    The combination of this page and the previous page shows the unit layout in the same configuration as the actual P.C. Board. 2NDCVCO BOARD • BOTTOM VIEW DOWNCONV BOARD • BOTTOM VIEW to RF UNIT HJ11 1 6 GND 1GLO 2GLO DOWN_CONV +3V +3S J2 2NDDVCO BOARD • BOTTOM VIEW J1 1 8 to RF UNIT HJ10
  • Icom IC-R20 | Service Manual - Page 56
    SECTION 10 BLOCK DIAGRAM ANTENNA 0.1500 - 3304.9999 MHz RF UNIT Explanatory notes 2SC5006 WIDEFM CONT. Q543 UNR9113J B-IFIN B_AM3V Q544 XP6501 LPF WFM B_AM3V Q545 ×1/2 XP6501 B_AM3V BUFF PLL IC BUFF 1-4B3V Q7: 2SC4117 Q6: 2SK880 VCO 3V Q10-Q11: XP1113 LOOP FIL D1:1SV245 1BVCO Q1
  • Icom IC-R20 | Service Manual - Page 57
    CPU3V RESET 16.384 MHz X2: CR-708 REC IC IC7: ML2302TB A_CTONE LPF A_DET Q12: 2SC4617 +3V +3 REG Q17: 2SA1588 Li+ EXTDC CHGC CHGS CHARGE CONTROL Q30: 2SB1201 Q31: HAT1023R Q32: 2SC4617 Q33: 2SB1132 Q34: +3 REG Q15: 2SA1362 LOGIC UNIT J2 USB USB INTERFACE IC3: FT245BM D0-D7 AF IN/OUT Explanatory
  • Icom IC-R20 | Service Manual - Page 58
    11 11-1 RF UNIT W1 W2 CP5 EP2 BAR ANTENNA 0.4950 - 1.6200 MHz B 1 blue 2 white W 3 red R G 4 green R247 2.7 CP8 C912 0.1 R538 JPW CP7 R246 220k C567 0.1 D100 SVC347 R243 100k CP6 VP 45 6 321 Q513 XP4601 A_TRAC ANTENNA C925 except [SEA], [EXP] HJ11 11 22 33 44 55 R19 C52 R20 47k 470p
  • Icom IC-R20 | Service Manual - Page 59
    AO10 VDD GND AO2 AO1 DI CLK LD DO AO12 AO11 VCC 20 19 18 17 16 15 14 13 12 11 +3S C867 0.01 D CLK D ANTSW IC22 CD4094BPWR D 1 2 3 4 5 6 7 8 STR D 3.0V R68 47k C101 10p L21 LS-510 C659 10 16 15 14 13 12 11 10 9 C241 0.22 IC2 TA31136FN MIXIN GND N-REC N-DET RSSI IFOUT QUAD AFOUT
  • Icom IC-R20 | Service Manual - Page 60
    14 VCC 10 RESET 25 11 12 13 1 2 3 4 5 6 7 8 9 RESET R4 10k B_NOISE A_NOISE BEEP S12 >> D3 D6 1SS400 1SS400 D2 D5 MA2S728 MA2S728 [SEA], [EXP], [CAN] [USA] only only B3 B2 S17 PLAY D9 1SS400 C26 0.001 3.2V Q3 3.1V 2SA1586 +3V R15 R20 IC4 100k 100k TC7W04FU 1 8 2 7 3 6
  • Icom IC-R20 | Service Manual - Page 61
    RD WR WR C15 0.01 C14 0.01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 NC NC NC NC NC TEST AVCC AGND XTOUT XTIN VCC D0 VBUS J2 from/to USB jack 98 5 4 3 2 1 76 EP3 D+ D- VBUS EP4 R6 27 UNIT 3.0V 3.1V CBUSY FIFOST RESET +3V SUB_3C R20 CPU_TX 100 CPU_RX C28 0.01 C27
  • Icom IC-R20 | Service Manual - Page 62
    C63 0.001 R29 100k Q8 2p 2SC5231 3.0V 2.8V R53 C64 10 C67 0.001 82 [EUR], [UK], [USA], [CAN] only C58 3.1V 0.1 R5 220 C8 0.1 R36 4.7k C54 0.001 D7 JPW [SEA], [EXP] R56 1k R56 JPW [SEA], [EXP] R55 1k R55 JPW [SEA], [EXP] 3.0V FINRF1 FINRF2 XFINRF GNDRF PS 12 11 10 9 8 C61
  • Icom IC-R20 | Service Manual - Page 63
    1k 1k C18 47p C19 47p C20 47p R22 330 R15 820 IC1 MB15E03SL R14 10 9 10 11 12 13 14 15 16 CLK DAT LE PS ZC L/F P R FIN XFIN GND DO VCC VP 180k C22 R16 C26 C24 0.1 0.01 Q3 0.01 1k 0.7V 2SC5277 2NDCVCO BOARD 11-7 2NDDVCO BOARD 1DVCO R4 1k 2.3V Q4 2.4V 2SC4617 R21 1k L2 47nH
  • Icom IC-R20 | Service Manual - Page 64
    180k R29 C47 1k 0.01 0.7V R20 10 R19 820 R32 C53 1k 0.01 R31 1k C48 0.01 C51 470p Q6 2SC5277 C50 C52 470p 470p IC4 MB15E03SL 1 2 3 4 5 6 7 8 OSCI OSCO VP VCC DO GND XFIN FIN R P L/F ZC PS LE DAT CLK 16 15 14 13 12 11 10 9 C18 470p R17 1k
  • Icom IC-R20 | Service Manual - Page 65
    QTY. 1 1 1 1 1 QTY. 1 2 1 [ACC ACCESSORIES] REF. NO. ORDER NO. DESCRIPTION QTY. EP1 800003420 BC-123A box SKT [EUR] 1 800003430 BC-123E (LS-11030-ADT) w/box SKT [UK] 1 Screw abbreviations BT: Self-tapping PH: Pan head ZK: Black MP6 CONTROL IC1:MM1433EVBE Q1:2SB1184 TANSHI BOARD CHG SELECT RL1 I SENSE R1
  • Icom IC-R20 | Service Manual - Page 66
    CT GND 1 2 3 4 C3 470p 470 IC2 NJM2360AM D6 SB20-03P R16 47k R15 150k C4 470 C12 470 R23 10 5.1v C21 47 1 2 3 4 5 6 7 8 9 10 11 12 CHGSW RESET TP1 TP2 VREF GND1 GND2 ADJ1 ADJ2 ADJ3 ADJ4 TDET 5.2V CHG ON CHG OFF 3.0 Vp-p 1.77 ms 0.6V D1 SB20-03P R3 R21
  • Icom IC-R20 | Service Manual - Page 67
    12-4 BC-156 BOARD LAYOUTS • MAIN UNIT (TOP VIEW) 1 1 CHGOUT CHGOUT DET2 BATT- J4 DET1 BATT+ SW CONT 9 THD to TANSHI BOARD J1 F1 • TANSHI BOARD (TOP VIEW) CP2 9 THD CONT 5V BATT+ J1 DET1 BATT- DET2 CHGOUT 1 CHGOUT to BC-156 MAIN UNIT J4 CP3 CP1 CP4 CP5 CP6 12 - 3
  • Icom IC-R20 | Service Manual - Page 68
    • MAIN UNIT (BOTTOM VIEW) 12 - 4
  • Icom IC-R20 | Service Manual - Page 69
    : +81 (06) 6793 0013 URL : http://www.icom.co.jp/world/index.html Icom America Inc. 2380 116th Avenue N.E., Bellevue, WA 98004, U.S.A. Phone : +1 (425) 454-8155 Fax : +1 (425) 454-1509 URL : http://www.icomamerica.com E-mail : [email protected]
  • Icom IC-R20 | Service Manual - Page 70
    1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14104MZ-C1 © 2004 Icom Inc.
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
COMMUNICATIONS RECEIVER
iC-r20
SERVICE
MANUAL