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Icom Ic-910h Vhf/Uhf All Mode Tranciever Service Manual

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    							SERVICE
    MANUAL
    VHF/UHF ALL MODE TRANSCEIVER
    i910H 
    						
    							INTRODUCTION
    This service manual describes the latest service information
    for the IC-910HVHF/UHF ALL MODE TRANSCEIVER at the
    time of publication.
    VERSION No.
    #02
    #04
    #06
    #07VERSION
    Europe
    Australia
    U.S.A.
    KoreaSYMBOL
    EUR
    AUS
    USA-1
    KOR
    To upgrade quality, any electrical or mechanical parts and
    internal circuits are subject to change without notice or
    obligation.
    DANGER
    NEVERconnect the transceiver to an AC outlet or to a DC
    power supply that uses more than 16 V.  This will ruin the
    transceiver.
    DO NOTexpose the transceiver to rain, snow or any liquids.
    DO NOTreverse the polarities of the power supply when
    connecting the transceiver.
    DO NOTapply an RF signal of more than 20 dBm (100 mW)
    to the antenna connector. This could damage the transceiv-
    er’s front end.
    ORDERING PARTS
    Be sure to include the following four points when ordering
    replacement parts:
    1. 10-digit order numbers
    2. Component part number and name
    3. Equipment model name and unit name
    4. Quantity required
    
    1110003140 IC LA1150N IC-910H  MAIN UNIT 5 pieces
    8810005770 Screw BiH M3´8 ZK IC-910H  Cover 10 pieces
    Addresses are provided on the inside back cover for your
    convenience.
    REPAIR NOTES
    1. Make sure a problem is internal before disassembling
    the transceiver.
    2.DO NOTopen the transceiver until the transceiver is 
    disconnected from its power source.
    3.DO NOTforce any of the variable components.  Turn
    them slowly and smoothly.
    4.DO NOTshort any circuits or electronic parts.  An insu-
    lated tuning tool MUSTbe used for all adjustments.
    5.DO NOTkeep power ON for a long time when the trans-
    ceiver is defective.
    6.DO NOTtransmit power into a signal generator or a
    sweep generator.
    7.ALWAYSconnect a 50 dB to 60 dB attenuator between
    the transceiver and a deviation meter or spectrum ana-
    lyzer when using such test equipment.
    8.READthe instructions of test equipment thoroughly
    before connecting equipment to the transceiver. 
    						
    							SECTION 1 SPECIFICATIONS
    SECTION 2 INSIDE VIEWS
    2 - 1 IC-910H  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 1
    2 - 2 UX-910 (OPTIONAL UNIT)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 3
    SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS
    SECTION 4 CIRCUIT DESCRIPTION
    SECTION 5 ADJUSTMENT PROCEDURES
    SECTION 6 PARTS LIST
    SECTION 7 MECHANICAL PARTS
    SECTION 8 SEMI-CONDUCTOR INFORMATION
    SECTION 9 BOARD LAYOUTS
    9 - 1 VR-A BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
    9 - 2 VR-B BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
    9 - 3 RIT BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
    9 - 4 FUNC BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
    9 - 5 MIC BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
    9 - 6 JACK BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
    9 - 7 DRV BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
    9 - 8 VARISTOR-A BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
    9 - 9 VARISTOR-B BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
    9 - 10 VARISTOR-C BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 3
    9 - 11 DISPLAY BOARD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 5
    9 - 12 PA UNIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 7
    9 - 13 PLL UNIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 9
    9 - 14 MAIN UNIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 11
    9 - 15 UX-910 MAIN UNIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 13
    SECTION 10 BLOCK DIAGRAMS
    10 - 1 MAIN UNIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1
    10 - 2 PA AND PLL UNITS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 2
    10 - 3 FRONT UNIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 3
    10 - 4 UX-910  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 3
    SECTION 11 WIRING DIAGRAM
    SECTION 12 VOLTAGE DIAGRAMS
    12 - 1 FRONT UNIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 1
    12 - 2 PLL UNIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 2
    12 - 3 PA UNIT (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 3
    12 - 4 PA UNIT (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 4
    12 - 5 MAIN UNIT (1)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 5
    12 - 6 MAIN UNIT (2)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 6
    12 - 7 MAIN UNIT (3)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 6
    12 - 8 UX-910 MAIN UNIT (1)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 7
    12 - 9 UX-910 MAIN UNIT (2)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 8
    TABLE OF CONTENTS 
    						
    							SECTION 1 SPECIFICATIONS
    1 - 1
    GENERAL
    • Frequency coverage :(Unit: MHz)
    *
    1Optional UX-910 is installed.
    *2Guaranteed range is 144.0–148.0 MHz.
    *3Guaranteed range is 430.0–450.0 MHz.
    *4Guaranteed range is 1240.0–1300.0 MHz.
    • Mode : USB, LSB, CW, FM, FM-N*
    *Not available in 1200 MHz band
    • No. of memory Ch. : 212 (99 regular, 6 scan edges, 1 calls for each band) plus 10 satellite memories)
    • Antenna connector : SO-239 (50Ω; VHF)
    Type-N (50Ω; UHF)
    • Usable temp. range : –10˚C to +60˚C; +14˚F to +140˚F
    • Frequency stability : Less than ±3 ppm (–10 to 60˚C; +14 to +140˚F)
    • Frequency resolution : 1 Hz minimum
    • Power supply : 13.8 V DC ±15% (negative ground)
    • Current drain (at 13.8 V DC) : 
    Transmit Max. power 23.0 A
    Receive Standby 2.0 A (3.0 A with  UX-910)
    Max. audio 2.5 A (3.5 A with UX-910)
    • Dimensions : 241(W)×94(H)×239(D) mm
    (projections not included) 9
    1⁄2(W)×311⁄16(H)×913⁄32(D) in
    •Weight (approx.) : 4.5 kg; 10 lb (with UX-910: 5.35 kg; 11 lb 13 oz)
    •ACC 1 connector : 8-pin DIN connector
    •CI-V connector : 2-conductor 3.5 (d) mm (
    1⁄8″)
    •DATA connectors : 6-pin mini DIN ×2 (for MAIN and SUB)
    TRANSMITTER
    •Output power : (continuously adjustable)
    144 MHz 5–100 W
    430 (440) MHz  5–75 W
    1200 MHz 1–10 W (with UX-910)
    •Modulation system : SSB Balanced modulation
    FM
    Variable reactance modulation
    •Spurious emission : 144/430 (440) MHz More than 60 dB
    1200 MHz More than 50 dB 
    •Carrier suppression : More than 40 dB
    •Unwanted sideband  : More than 40 dB
    suppression
    •
    Microphone connector: 8-pin connector (600 Ω)
    •KEY connector : 3-conductor 3.5(d) mm (
    1⁄4″) Version 144 MHz 430 (440) MHz 1200 MHz*
    1
    U.S.A.Tx: 144.0–148.0 Tx: 430.0–450.0 Tx: 1240.0–1300.0
    Rx: 136.0–174.0*2Rx: 420.0–480.0*3Rx: 1240.0–1320.0*4
    Europe 144.0–146.0 430.0–440.0 1240.0–1300.0
    Australia 144.0–148.0 430.0–450.0 1240.0–1300.0
    Korea 144.0–146.0 430.0–440.0 1260.0–1300.0
    All stated specifications are subject to change without notice or obligation. 
    						
    							RECEIVER
    •Receive system : 
    VHF SSB, CW
    Single conversion superheterodyne
    FMDouble conversion superheterodyne
    UHF SSB, CWDouble conversion superheterodyne
    FM Triple conversion superheterodyne
    •Intermediate frequencies :
    (Unit: MHz)
    •Sensitivity : SSB, CW (10 dB S/N)Less than 0.11 µV
    FM 
    (12 dB SINAD)Less than 0.18 µV 
    •Squelch sensitivity : SSB, CW Less than 1.0 µV
    (threshold)FM Less than 0.18 µV
    •Selectivity : SSB, CW More than 2.3 kHz/–6 dB
    Less than 4.2 kHz/–60 dB*
    FM  More than 15.0 kHz/–6 dB
    Less than 30.0 kHz/–60 dB*
    FM-N  More than 6.0 kHz/–6 dB
    Less than 18.0 kHz/–36 dB
    CW-N  More than 0.5 kHz/–6 dB
    (w/FL-132 or FL-133)Less than 1.34 kHz/–60 dB*
    *Except 1200 MHz band
    •Spurious and image rejection ratio:
    144/430 (440) MHz More than 60 dB
    1200 MHz More than 50 dB 
    •AF output power 
    (at 13.8 V DC):
    More than 2.0 W at 10% distortion with an 8Ωload
    •RIT variable range  : 144/430 (440) MHz ±1.0 kHz 
    (SSB, CW)
    ±5.0 kHz (FM)
    1200 MHz ±2.0 kHz (SSB, CW)
    ±10.0 kHz (FM)
    •IF SHIFT variable range: More than ±1.2 kHz
    •PHONES connector : 3-conductor 6.35(d) mm (
    1⁄4″)
    •Ext. SP connectors : 2-conductor 3.5 (d) mm (
    1⁄8″) /8Ω×2 (for MAIN and SUB) MAIN BAND SUB BAND
    1st 2nd 3rd 1st 2nd 3rd
    SSB 10.8500——10.9500——
    CW 10.8491——10.9491——
    FM 10.8500 0.455—10.9500 0.455—
    SSB 71.2500 10.8500—71.3500 10.9500—
    CW 71.2491 10.8491—71.3491 10.9491—
    FM 71.2500 10.8500 0.455 71.3500 10.9500 0.455
    SSB 243.9500 10.8500—243.9500 10.9500—
    CW 243.9491 10.8491—243.9491 10.9491—
    FM 243.9500 10.8500 0.455 243.9500 10.9500 0.455
    144 MHz
    430 (440) MHz
    1200 MHz
    1 - 2 
    						
    							2 - 1
    SECTION 2 INSIDE VIEWS
    2-1 IC-910H
    • MAIN AND PLL UNITS
    DDS IC
    (IC701: SC-1287) DDS gate array
    (IC131: SC-1246A) DDS gate array
    (IC331: SC-1246A) PLL unit
    144 MHz band VCO circuit 430 MHz band VCO circuit
    Reference oscillator
    (X512: CR-452 30.2 MHz) Driver IC
    (IC1: BU4094BCF) DDS IC
    (IC601: SC-1287)
    AF power amplifier
    (IC1852: LA4445) MAIN unit * Located under side of the point
    FM IF IC
    (IC951: TA31136FN)
    D/A converter
    (IC1521: M62352GP)
    Analog master IC*
    (IC1701: mPC5023-077)
    FM IF IC
    (IC401: TA31136FN) Crystal band pass filter
    (FI751: FL-129) Crystal band pass filter
    (FI151: FL-128)
    TX IF amplifier*
    (Q1: 3SK131) 
    						
    							2 - 2
    • PA UNIT
    TX balanced mixer
     Q501, Q502: 2SK302
     D502: 1SV286 RX balanced mixer
    (Q511, Q512: 2SK1740) Pre-amplifier
    (Q507: 3SK177)
    145 MHz power amplifier
    (Q651, Q652: 2SC5152) TX/RX switching relay
    (RL700: AE5349)
    Varistor-A boardVaristor-C board
    440 MHz power amplifier
    (Q151, Q152: 2SC3102)
    TX balanced mixer*
    (Q1, Q2: 2SK302) Pre-amplifier
    (Q260: 3SK177)
    RX balanced mixer
    (Q220, Q221: 2SC3356)
    DRV boardDrive amplifier
    (Q131: SRFJ7044)
    * Located under side of the pointVaristor-B board
    TX double balanced mixer
     D190: HSB88WS
     L190, L191: 617DB-1010 
    						
    							2 - 3
    2-2 UX-910 (OPTIONAL UNIT)
    • TOP VIEW
    • BOTTOM VIEW
    Power module IC
    (IC21: M57762-02)
    1st LO VCO circuit PLL IC
    (IC501: TB31242)
    DDS IC
    (IC661: SC-1246A)RF pre-amplifier
    (Q281: NE34018) Power supply circuit
    for AG-1200
     Q72: DTC144EU
     Q73, Q74: 2SC2712
    RF amplifier
    (Q271: 2SC5454)
    YGR amplifier
    (IC141: mPC1878G)TX 1st mixer
    (IC131: mPC8163TB)
    RX 1st mixer
    (IC241: mPC2721)
    TX 1st IF amplifier
    (IC111: mPC2709)
    RX 2nd mixer
    (Q221: 3SK166)
    TX 2nd mixer
    (D82: HSB88WS)
    2nd LO VCO circuit
    Power supply circuit for AG-1200
    (Q71: 2SD1801)
    Pre-drive amplifier
    (Q36: 2SK2354)
    2nd IF amplifier
    (Q81: 2SC2712)
    Divider
    (IC610: TC7W74FU)
    Reference amplifier
    (IC601: TC7SU04F)
    Drive amplifier
    (Q38: 2SK2855) 
    						
    							SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS
    • Opening the transceiver’s case
    Follow the case and cover opening procedures
    shown here when you want to install an optional unit
    or adjust the internal units, etc.
    qRemove the 5 screws from the top of the trans-
    ceiver and  4 screws from the sides, then lift up the
    top cover.
    wTurn the transceiver upside down.
    eRemove 5 screws from the bottom of the trans-
    ceiver, then lift up the bottom cover.
    CAUTION:DISCONNECT the DC power cable
    from the transceiver before performing any work
    on the transceiver. Otherwise, there is a danger of
    electric shock and/or equipment damage.
    • UX-910 1200MHz BAND UNIT
    qRemove the bottom cover as shown above.
    wRemove the antenna plate from the chassis using a stan-
    dard screw driver.
    WARNING!
    NEVER attempt to remove the antenna plate using
    your finger, this may result in injury.
    eConnect the FFC (Flexible Flat Cable) of the 
    UX-910 to J2 on the MAIN unit, DC power cable to the
    power connector (W305) from the PA unit and the coaxi-
    al cable to J541 on the PLL unit.
    CAUTION
    NEVER catch the cables from the optional DSP unit(s)
    between chassis and the UX-910, this may damage
    the DSP unit(s) and/or transceiver.
    J541
    J2
    UX-910
    PLL unit
    Power connectorDC power cable Coaxial cable
    Flexible flat cable
    Disconnect the 
    speaker cable.
    rPlace the UX-910 using the supplied 4 screws.
    BE CAREFULnot to drop the supplied screws inside
    the transceiver.
    Antenna plate
    UX-910
    Turn the flexible flat cable up under the UX-910.
    J2
    MAIN unitFlexible flat cable UX-910
    tReturn the bottom cover to its original position.
    3 - 1 
    						
    							• Opening the PA unit cover
    qRemove the top cover as shown in the diagram on p. 3-
    1.
    wRemove 8 screws and grounding plate from the PA unit
    cover.
    eRemove fastening tape from the inside power cable.
    grounding plate
    • FL-132/FL-133 CW NARROW FILTER
    qRemove the bottom cover as shown in the diagram on 
    p. 3-1.
    • Remove the UX-910 if you have installed it. (p. 3-1)
    wDisconnect the connection cable connectors from J501
    and J1051 on the MAIN unit.
    eRemove 2 clips.
    WARNING!
    BE CAREFULnot to pinch your finger with the clip.
    rRemove 6 screws from the MAIN unit, then lift up the
    MAIN unit.
    PLL unit
    MAIN unit
    J1051 J501
    Clips
    rSlide the PA unit cover as shown below.
    tInstall FL-132 or FL-133 to the specified position on the
    MAIN unit.
    FL-132
    (MAIN)
    FL-133
    (SUB)
    ySolder then cut the leads, keeping 2–3 mm (1/8’’) of the
    leads from the bottom of the MAIN unit.
    uReturn the MAIN unit and clips to their original positions.
    iRe-connect the connection cable connector to J501 and
    J1051 on the MAIN unit.
    oReturn the bottom cover to the original position.
    (MAIN)
    (SUB)
    3 - 2 
    						
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