Icom IC-R2 Service Manual
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Icom IC-R2 Service Manual

Icom IC-R2 Service Manual

Communications receiver
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Summary of Contents for Icom IC-R2

  • Page 1 SERVICE MANUAL COMMUNICATIONS RECEIVER...
  • Page 2 INTRODUCTION This service manual describes the latest service information for the IC-R2 at the time of publication. MODEL VERSION SYMBOL Europe Italy Taiwan U.S.A. IC-R2 Canada Other OTH-1 To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or oblig- ation.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTIONS SECTION CIRCUIT DESCRIPTION RECEIVER CIRCUITS ........... . .4-1 PLL CIRCUITS .
  • Page 4 SECTION 1 SPECIFICATIONS GENERAL RECEIVER • Receiver system : Tripple super heterodyne • Frequency range • Intermediate frequency : 1st 266.7 MHz Version Receive Frequencies (MHz) 2nd 19.65 MHz EUR, U.K., 450 kHz CAN, OTH, 0.495 – 1309.995 • Sensitivity* : (except spurious points) OTH-1 Frequency (MHz)
  • Page 5 SECTION 2 INSIDE VIEWS • LOGIC UNIT AF power amplifier (IC15: TA31056F) AF mute switch (Q37: 2SJ144) AF filter (Q30: XP6501) +3.2 regurater (IC4: S-81332H) • RF UNIT TOP VIEW BOTTOM VIEW 1st mixer 2nd mixer (IC1: PC2757T) (IC10: PC2757T) IF amplifer (Q5: 2SC5231) FM IF IC...

  • Page 6: Section 3 Disassembly Instructions

    SECTION 3 DISASSEMBLY INSTRUCTIONS • • REMOVING THE REAR PANEL REMOVING THE LOGIC UNIT 1 Unscrew 2 screws, A . 1 Unscrew 2 screws, G . 2 Remove the rear panel in the direction of the arrow. 2 Unsolder 2 points, H, and then remove the LOGIC unit. Rear panel LOGIC unit •...

  • Page 7: Section 4 Circuit Description

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS (3) 30–117.995 MHz, 175–329.995 MHz The 30 MHz–117.95 MHz, 175 MHz–329.995 MHz signals 4-1-1 ANTENNA SWITCHING CIRCUIT (RF UNIT) pass through the low-pass filter (C40–C43, C665, C666, L9, The RF signals from the antenna connector pass through L10, L92), and are then applied to the RF amplifier (Q36).
  • Page 8 IC2 contains the 3rd mixer, limiter amplifier, quadrature While in AM mode, AF signals are pass through the band- detector and S-meter detector, etc. A frequency from the pass filter and are then applied to the pre-amplifier (Q31). PLL reference oscillator is used for the 3rd LO signal (19.20 MHz).

  • Page 9: Pll Circuits

    4-2-3 1ST VCO CIRCUIT (RF UNIT) • TONE SQUELCH The tone squelch circuit detects AF signals and opens the The oscillated signal is applied to the buffer amplifiers (IC4, squelch only when receiving a signal containing a matching Q40). The amplified signal is applied to the 1st mixer circuit subaudible tone (CTCSS).

  • Page 10: Power Supply Circuits

    4-3 POWER SUPPLY CIRCUITS 4-4 PORT ALLOCATIONS VOLTAGE LINE 4-4-1 CPU (LOGIC UNIT IC11) DESCRIPTION LINE Port Description number name The voltage from the attached battery. BATT Output control signal for the adjust- Common 13 V converted from BATT line by the ment mode.
  • Page 11 Port Port Description Description number name number name Output port for 1st VCO SHIFT signals LIGHT Output LCD backlight control signal. to the shift switch (RF unit; Q29). High : Lights ON SHIFT High : Shift ON (380 – 550 MHz). Outputs +3S requlator control singal Low : Shift OFF (267.2 –...

  • Page 12: Section 5 Adjustment Procedures

    SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION The receiver (IC-R2) must be adjusted on the adjustment mode after programmed adjustment frequency data into memory chan- nel. When you program adjustment frequency data into memory channel, optional CS-R2 , OPC-478 PROGRAMMING SOFTWARE CLONING CABLE are requird ‘...
  • Page 13 CONNECTION Terminator for the entering adjustment mode 68 k to [SP] jack 1/8" (3.5 mm) 3-conductor plug Standard signal generator AD-92SMA Optional SMA–BNC adaptor DC power supply 3.0 V/1.0 A 5 - 2...

  • Page 14: Pll Adjustment

    5-2 PLL ADJUSTMENT ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST 1ST VCO • Displayed frequency : Connect the digital 1.9 V – 2.9 V Verify LOCK 493.300 MHz multi-meter to the VOLTAGE • Receiving check point LV1. (SHIFT ON) •...
  • Page 15 Detector output voltage adjustment QUAD Detector output voltage check point PLL Reference Frequency check point 2nd VCO lock voltage check point 1st VCO lock voltage check point 5 - 4...

  • Page 16: Receiver Adjustment

    5-3 RECEIVER ADJUSTMENT ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST • Displayed frequency : Connect Maximum DC voltage LOGIC [DIAL] (tk ch) 145.600 MHz voltmeter SENSITIVITY • Connect an SSG to the antenna check point SEN. connector and set as : Level : 1 µV...
  • Page 17 VHF and UHF sensitivity check point. 5 - 6...

  • Page 18: Section 6 Parts List

    SECTION 6 PARTS LIST [LOGIC UNIT] [LOGIC UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1130008970 S.IC HD74LV00TELL 7030005080 S.RESISTOR ERJ2GEJ 823 X (82 kΩ) 1130009020 S.IC X25650S8I-2.5T6 7030005080 S.RESISTOR ERJ2GEJ 823 X (82 kΩ) 1180001820 S.IC XC62FP3002MR 7030005080 S.RESISTOR ERJ2GEJ 823 X (82 kΩ) 1180001720 S.IC S-81332HG-KC-T1 7030005310 S.RESISTOR...
  • Page 19 [LOGIC UNIT] [LOGIC UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030014200 S.CERAMIC ECUE1H101JCQ 5040002230 S.LED CL-200YG-C-TS 4030013970 S.CERAMIC C1005 JB 0J 104K-T-N 5030001610 LCD DLC-7995YBGF 4550006760 S.TANTALUM TEMSVB2 1A 336M-8R 4030013850 S.CERAMIC ECUE1E102KBQ 4030008680 S.CERAMIC C2012 JF 1C 105Z-T-A 2230000900 S.SWITCH JPM1990-2013R 4030014120 S.CERAMIC ECUE1H100CCQ 2250000390 ENCODER...
  • Page 20 [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1790001620 S.DIODE ISV308 (TPL3) 6200008570 S.COIL LQN21A 6N8D04 1790001620 S.DIODE ISV308 (TPL3) 6200008510 S.COIL 0.30-0.9-4TR 10.5N 1790000850 S.DIODE MA132WK (TX) 6200008490 S.COIL 0.30-0.9-3TR 7.5N 1790001620 S.DIODE ISV308 (TPL3) 6910011690 S.COIL ACB1608M-600-T 1790001620 S.DIODE ISV308 (TPL3) 6200005700 S.COIL ELJRE 22NG-F...
  • Page 21 [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION ERJ2GEJ 101 X (100 Ω) R100 7030008010 S.RESISTOR ERJ2GEJ 123X (12 kΩ) R325 7030004980 S.RESISTOR ERJ2GEJ 820 X (82 Ω) R101 7030005240 S.RESISTOR ERJ2GEJ 473 X (47 kΩ) R326 7030005570 S.RESISTOR R102 7030007290 S.RESISTOR ERJ2GEJ 222 X (2.2 kΩ) R327...
  • Page 22 [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030014230 S.CERAMIC ECUE1E681KBQ C250 4030014110 S.CERAMIC ECUE1H080CCQ C100 4030013970 S.CERAMIC C1005 JB 0J 104K-T-N C251 4030014070 S.CERAMIC ECUE1H040BCQ C101 4030014120 S.CERAMIC ECUE1H100CCQ C252 4030014110 S.CERAMIC ECUE1H080CCQ C102 4030013850 S.CERAMIC ECUE1E102KBQ C256 4030013850 S.CERAMIC ECUE1E102KBQ C103 4030009820 S.CERAMIC...
  • Page 23 [RF UNIT] ORDER DESCRIPTION C665 4030014200 S.CERAMIC ECUE1H101JCQ C666 4030014470 S.CERAMIC ECUE1E391KBQ C667 4030009820 S.CERAMIC C1005 JB 1C 103K-T-A 6510020550 S.CONNECTOR AXK6S40445P 0910050763 PCB B 5163C S.=Surface mount 6 - 6...
  • Page 24 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7-1 CABINET PARTS [ACCESSORIES] [CHASSIS PARTS] REF. NO. ODER NO. DESCRIPTION QTY. [ EUR ] , [ USA ] , [ CAN ] REF. NO. ODER NO. DESCRIPTION QTY. 3030000420 NICD CEL [ OTH ] only 3030000450 NICD CEL 6510020950 Connector SMA-R226 3310002150 Antenna FA-S270C...
  • Page 25 MP3 (C) MP15 (C) MP5 (C) MP2 (C) RF unit J1 (R) MP22 (C) J1 (C) MP4 (L) MP2 (L) MP3 (L) EP2 (L) MP23 (C) DS8 (L) MP1 (L) MP8 (C) MP14 (C) MP6 (C) MP22 (C) MP11 (C) MP10 (C) MP5 (L) MP13 (C)
  • Page 26 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTOR AND FET’S 2SA1588 GR 2SC4081 S 2SC4117 GR 2SC4215 O 2SC4617 S (Symbol: A6) (Symbol: BS) (Symbol: DG) (Symbol: QO) (Symbol: BR) 2SC5006 2SC5231 C8 2SC5277 D2 2SJ144 Y 2SK880 Y (Symbol: 24) (Symbol: C8) (Symbol: D2) (Symbol: VX) (Symbol: XY)

  • Page 27: Section 9 Board Layouts

    SECTION 9 BOARD LAYOUTS 9 - 1 LOGIC UNIT • TOP VIEW R100 R185 9 - 1...
  • Page 28 • BOTTOM VIEW C116 R173 R175 R172 R182 IC10 to RF unit J1 R179 R180 C101 R181 SDET FSET RSSI WFMS C120 PSTB C108 R103 PCK_IS 300MC PDAUL 800MC IC15 C114 UHFC VHFC TRAC SHIFT R156 R113 R138 DBL1 R153 R141 DBL2 R112...
  • Page 29 9 - 2 RF UNIT • TOP VIEW R174 C242 C200 R177 R172 R179 to RF unit J1 C221 C247 C427 R205 C102 R159 R204 R103 SDET C432 C654 IC10 RSSI FSET C435 WFMS C249 C663 R324 C148 R326 PSTB R231 R187 C147...
  • Page 30 • BOTTOM VIEW QUADFI2 C103 C424 C659 C434 C259 C241 C154 R121 C656 C505 C234 C139 Q501 C214 Q502 C503 C138 C162 C410 C211 C172 R129 R123 C167 C233 C168 C190 R188 C186 C164 R210 C191 R215 C193 C119 C183 C182 C178 R125...

  • Page 31: Logic Unit

    SECTION 10 BLOCK DIAGRAM RF UNIT Q509: DTA144EE COMMON 0.495-1.8995MHz D68: 1SV172 Q506: DTA144EE Q501: DTA144EE HF3V RXBAND B1_3V 300M3V 300MC D63: MA2S077 RXBAND RXBAND D65: MA2S077 DATA D66: MA2S077 Q505: 2SC4215 D69: MA2S077 Q502: XP1113 BANDSW BANDSW UHF3V UHFC RXBAND VHF3V VHFC...

  • Page 32: Voltage Diagram

    SECTION 11 VOLTAGE DIAGRAM • LOGIC UNIT DS8 DLC-7995 3.01 BATRY LIGHT ON: 2.82 MODE: 0 BAND: 1.572 V/H: 2.31 R172 10 k 10 k 2SC4081 S C107 LAMPS 0.22 LIGHT R184 120 k SHIFT CL-200YG-C-TS JPM1990-2013R AXK5S40340P C108 MODE 0.001 0.001 KSQL...

  • Page 33: Rf Unit

    • RF UNIT 1stVCO SHIFT OFF 267.2-380.0MHz SHIFT ON 380.0-550.0MHz 3.12 0.495-1.9M: 1.99 R169 R196 C258 0.001 1.71 CHASSIS 2.42 C158 B1_3V C235 UNIT 0.495-1.9M: 1.99 R171 C257 0.001 C166 0.001 0.495-1.9M C536 R197 R198 R124 Q506 0.001 0.001 R227 56 k C165 ON: 0...
  • Page 34 Icom (UK) Ltd. : http://www.icomcanada.com Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K. Phone : 01227 741741 Fax : 01227 741742 Icom (Australia) Pty. Ltd. : http://www.icomuk.co.uk A.B.N. 88 006 092 575 Icom France S.a 290-294 Albert Street, Brunswick, Victoria, 3056, Australia...
  • Page 35 A-5520IZ-S-w © 1998 Icom Inc. 1-1-32, Kamiminami, Hirano-ku Osaka 547-0003, Japan...

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