Icom AT-141 Service Manual
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Icom AT-141 Service Manual

Hf automatic antenna tuner
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SERVICE MANUAL
HF AUTOMATIC ANTENNA TUNER
SECTION
1
SPECIFICATIONS
SECTION
2
INSIDE VIEWS
SECTION
3
CIRCUIT DESCRIPITON
3-1
3-2
3-3
3-4
SECTION
4
ADJUSTMENT PROCEDURES
SECTION
5
PARTS LIST
SECTION
6
MECHANICAL PARTS AND DISASSEMBLY
SECTION
7
SEMI-CONDUCTOR INFORMATION
SECTION
8
BOARD LAYOUT
SECTION
9
BLOCK DIAGRAM
SECTION
10 VOLTAGE DIAGRAM
RECEIVER CIRCUITS ............................................................................................................. B-3-1
TRNSMITTER CIRCUITS ........................................................................................................ B-3-1
POWER SUPPLY CIRCUITS ................................................................................................... B-3-1
OTHER CIRCUITS ................................................................................................................... B-3-2
B

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Summary of Contents for Icom AT-141

  • Page 1 SERVICE MANUAL HF AUTOMATIC ANTENNA TUNER SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS ......................B-3-1 TRNSMITTER CIRCUITS ......................B-3-1 POWER SUPPLY CIRCUITS ....................B-3-1 OTHER CIRCUITS ........................B-3-2 SECTION ADJUSTMENT PROCEDURES SECTION PARTS LIST SECTION MECHANICAL PARTS AND DISASSEMBLY SECTION SEMI-CONDUCTOR INFORMATION SECTION...

  • Page 2: Specifications

    SECTION 1 SPECIFICATIONS GENERAL • Number of memory channels : 45 • Frequency coverage : 1.6–30 MHz with a 7 m or longer antenna element • Maximum input power : 150 W PEP 100 W continuous • Input impedance : 50 Ω •...

  • Page 3: Inside Views

    SECTION 2 INSIDE VIEWS Antenna terminal Control cable receptacle Forward power LEDs detector circuit (DS1-DS23: SML-311UT) Attenuator SWR detector circuit (IC15: MB95F108AHSPFM) Phase detector +5V regulator circuit (IC20: TA7805F) Ground terminal Antenna cable receptacle B - 2 - 1...

  • Page 4: Circuit Description

    SECTION 3 CIRCUIT DESCRIPTION 3-1 GENERAL An 8-bit microprocessor controls the AT-141. The antenna tuner matches the antenna system to the transceiver by using four kinds of detector circuits. (1) FORWARD POWER DETECTOR (2) SWR DETECTOR (3) PHASE DETECTOR (4) IMPEDANCE DETECTOR Detailed descriptions for each circuit as follows.
  • Page 5 3-4 PHASE DETECTOR CIRCUIT 3-6 LOGIC CIRCUIT The phase detector consists of L2, L3 and D81. The phase The CPU (IC15) controls the antenna matching network. detector’s purpose is to detect reactance components and The CPU receives +5V through IC20 when DC power is provide a pure resistance.

  • Page 6: Section 4 Adjustment Procedures

    : Depended on connected transceiver DC power supply Current capacity : Depended on connected transceiver Frequency range : DC–20 MHz Oscilloscope Measuring range : 0.01–10 V • CONNECTION DC power supply – AT-141 IC-M801E Antenna receptacle Control receptacle B - 4 - 1...

  • Page 7: Tuner Adjustment

    4-2 TUNER ADJUSTMENT MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST PREPARA- 1 • Disconnect short pin (P6) from J6 TION • Connect the disconnected short pin (P6) to J13. • Connect a wire between CP15 and ground. •...

  • Page 8: Parts List

    SECTION 5 PARTS LIST [TUNER-1 UNIT] [TUNER-1 UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 1130007570 S.IC BU4094BCFV-E2 64.3/127.9 6110002800 COL LA-464 1130007570 S.IC BU4094BCFV-E2 64.3/147.1 6110002810 COL LA-465 1130007570 S.IC BU4094BCFV-E2 64.3/166.2 6110002820 COL LA-466 1130008411 S.IC TC74A393F (EL, F) 30.6/128.3 6110002830 COL LA-467...
  • Page 9 [TUNER-1 UNIT] [TUNER-1 UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 7030003400 S.RES ERJ3GEYJ 471 V (470) 80.2/164.8 R208 7410000352 ARY RGLD3X104J 7030003400 S.RES ERJ3GEYJ 471 V (470) 80.2/162.5 R209 7410000352 ARY RGLD3X104J 7030003400 S.RES ERJ3GEYJ 471 V (470) 80.2/160.2 R210 7030003480 S.RES ERJ3GEYJ 222 V (2.2 k) 72/123.4 7030003400 S.RES ERJ3GEYJ 471 V (470)
  • Page 10 [TUNER-1 UNIT] [TUNER-1 UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 4010004810 CER DEC1X3J101JC4B C207 4030006880 S.CER C1608 JB 1H 472K-T 83.8/128 4030006880 S.CER C1608 JB 1H 472K-T 99.9/8.2 C208 4030006880 S.CER C1608 JB 1H 472K-T 83.8/130.3 4030008960 S.CER C2012 JB 1C 104K-T 36.1/69 C209 4030006880 S.CER C1608 JB 1H 472K-T...
  • Page 11 [TUNER-1 UNIT] [CHASS UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 6910003120 CNR IMSA-9206H-T W501 8900014990 CBL OPC-1468 6910003120 CNR IMSA-9206H-T W502 8900011400 CBL OPC-1164 5040002620 S.LED SML-311UT T86 T 167.6/134.7 5040002620 S.LED SML-311UT T86 T 165.9/131.5 5040002620 S.LED SML-311UT T86 T 164.3/134.7 5040002620 S.LED SML-311UT T86...

  • Page 12: Mechanical Parts And Disassembly

    SECTION 6 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] [TUNER-1 UNIT] REF. ORDER REF. ORDER DESCRIPTION QTY. DESCRIPTION QTY. W501 8900011380 Cable OPC-1146 8510001101 Shied case (A) cover (A)-1 W502 8900011400 Cable OPC-1164 8510001081 Shield case (A)-1 8510003500 406 shield case EP501 6910000880 Sheet NC-1 (SUS)
  • Page 13 MP526 (C) MP525 (C) MP524 (C) MP523 (C) MP504 (C) MP505 (C) MP522 (C) MP541 (C) MP510 (C) MP508 (C) MP502 (C) MP539 (C) MP509 (C) MP536 (C) MP535 (C) MP537 (C) MP506 (C) MP510 (C) MP520 (C) MP521 (C) MP552 (C) TUNER-1 UNIT MP519 (C)

  • Page 14: Section 7 Semiconductor Information

    SECTION 7 SEMICONDUCTOR INFORMATION • TRANSISTORS AND FET'S 2SA1586 GR 2SC4116 GR DTC144EUA T106 (Symbol: SG) (Symbol: LG) (Symbol: 26_) • DIODES 1SS301 HSB88WSTR HSM88AS TR MA2S111 MA732 (Symbol: B3) (Symbol: Silver line) (Symbol: C1) (Symbol: A) (Symbol: 2C) MA862 (Symbol: M1I) B - 7 - 1...

  • Page 15: Board Layout

    SECTION 8 BOARD LAYOUT to CHASSIS W501 to antenna to ground Terminal Terminal to TRANSCEIVER CHASSIS W502 B - 8 - 1...

  • Page 16: Block Diagram

    SECTION 9 BLOCK DIAGRAM Explanatory notes VOLTAGE LINE COMMON LINE TRANSCEIVER NETWORK D13, D14 MA732 × 2 MA732 NETWORK D7, D8, D11, D12 IC19 IC3, IC4 IC2, IC3 MA732 × 4 TA75393S BU4094BCFV × 2 BU4094BCFV × 2 COMPARATOR BUFF LATCH LATCH Q2 2SC4116...

  • Page 17: Voltage Diagram

    SECTION 10 VOLTAGE DIAGRAM CP15 NORMAL: 13.6 WHILE TUNING: 0.7 CHASSIS 100µ LR-22A 3Vp-p 10µ W502 13.6 2Vp-p 180p R151 MA732 2.2k AJQ1341 1SS301 C152 C100 C102 C104 C106 C108 C110 C112 C114 C118 C116 C147 2.5V 0.0047 0.0047 0.0047 0.0047 0.0047 0.0047...
  • Page 18 Phone : +81 (06) 6793 5302 F ax : +81 (06) 6793 0013 : http://ww w .icom.c o .jp/ w o r ld/ind e x.html <Co r po r ate Headqua r ters> Communication Equipment 2380 116th A v e n ue N.E., Bell e vu e , W A 98004, U . S .A.
  • Page 19 S-14232HZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2006 Icom Inc.

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