Motorola IC-T81A, IC-T81E service manual Icom America Inc

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1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan

Phone :		06 6793 5302
Fax	:	06 6793 0013
URL	:	http://www.icom.co.jp/world/index.html

Icom America Inc.

<Corporate Headquarters>

2380 116th Avenue N.E., Bellevue, WA 98004, U.S.A. Phone : (425) 454-8155 Fax : (425) 454-1509 URL : http://www.icomamerica.com

<Customer Service> Phone : (425) 454-7619

Icom Canada

Glenwood Centre #150-6165

Highway 17 Delta, B.C., V4K 5B8, Canada Phone : (604) 952-4266 Fax : (604) 952-0090 URL : http://www.icomcanada.com

Icom (Australia) Pty. Ltd.

A.B.N. 88 006 092 575

290-294 Albert Street, Brunswick, Victoria, 3056, Australia

Phone : 03 9387 0666 Fax : 03 9387 0022

URL : http://www.icom.net.au

Icom New Zealand

146A Harris Road, East Tamaki,

Auckland, New Zealand

Phone : 09 274 4062

Fax : 09 274 4708

Icom (Europe) GmbH

Communication Equipment

Himmelgeister Str. 100, D-40225 Düsseldorf, Germany Phone : 0211 346047 Fax : 0211 333639

URL : http://www.icomeurope.com

Icom Spain S.L

Crta. de Gracia a Manresa Km. 14,750

08190 Sant Cugat del Valles Barcelona, SPAIN Phone : (93) 590 26 70 Fax : (93) 589 04 46 URL : http://www.icomspain.com

Icom (UK) Ltd.

Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K. Phone : 01227 741741 Fax : 01227 741742 URL : http://www.icomuk.co.uk

Icom France S.a

Zac de la Plaine, Rue Brindejonc des Moulinais BP 5804, 31505 Toulouse Cedex, France Phone : 561 36 03 03 Fax : 561 36 03 00 URL : http://www.icom-france.com

Asia Icom Inc.

6F No. 68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C. Phone : (02) 2559 1899 Fax : (02) 2559 1874

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Contents Multiband FM Transceiver Introduction Ordering PartsRepair Notes Sample OrderTable of Contents Specifications GeneralTransmitter Version 50 MHz 145 MHz 440 MHz 1200 MHz MHz RX onlyReceiver BandWFM WFMInside Views Logic UnitRF Unit CPUDisassembly Instructions Removing the Chassis Panel Removing the Shield PlateRemoving the Logic Unit Removing the RF Unit Logic unitAntenna Switching Circuits RF Unit Circuit DescriptionReceiver Circuits Duplexer Circuit RF Unit7 1ST Mixer Circuit RF Unit Transmitter Circuits DRIVE/POWER Amplifier Circuits RF Unit APC Circuits RF UnitMHz PA APC Control CircuitPower Supply Circuits Voltage Line PLL CircuitsLine Description VCCPort Allocations 1 I/O Expander IC RF Unit IC22 I/O Expander IC RF Unit IC3 Pin Port Description Number NameCPU Logic Unit IC1 Adjustment Procedures Preparation‘ Required Test Equipment ConnectionPLL Adjustment RF Unit Bottom View ULVVLV RF Unit TOP View 6MLVReceiver Adjustment DialSensitivity VHFLogic Unit TOP View Meter SSGTop Push and hold MHz band 101 dBmDisplayed frequency Push and hold445.000 MHz USA-1 SQL keyTransmitter Adjustment Deviation HPF OFF LPFDtmf AUS, SEAParts List =Surface mountTrimmer Ceramic ECUE1H121JCQ Transistor UN911D TX Coil Eljnd R10J 0.1U Themistor Ceramic ECUE1H060CCQ Ceramic ECUE1H390JCQ VCO Board Ceramic ECUE1H120JCQ Mechanical Parts and Disassembly AccessoriesChassis Parts VCO UnitMP29 C Transistor and FET’S SEMI-CONDUCTOR InformationDiodes Logic Unit Board LayoutsTOP View Bottom View IC1IC3 GND Pset IfinRF Unit IC6L912 J4 to Logic unit J1IC3 MP1IC2 VCO Board J302 to RF unitOUT 12VCOOUT VLVCO3 VHF GND VHVCO3 UVCO3 Uhfout GND 12VCO3 GNDQ354 Block Diagram Mode Xtal BPF PDA2, CK AMP TX/RX FrequencyTX/RX Buff ANT LPF HPF AMPReset Mode Xtal Initial BPFMOD TX/RX Frequency ANT Buff HPF LPF YGRSection Voltage Diagram Logic Unit2NDLO Oscin Mixin Oscout GND Mixout REC VCC DET Ifin RssiDEC Ifout Filout Quad WFM NTCCF20124AH 473KCT TXC12VCO COM2 Reset COM3 COM2 Reset PowerClonein VCC VIN Cpuhv COM4 COM3 COM2 COM1RF Unit VHF400M 1200M50M 00M1200MHz 400MHzGND1 PLST1 IN1ENB VCC2 LOK GND2Icom America Inc 5566I-S Icom Inc