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Icom IC-T7A, Service Manual

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Summary of Contents for IC-T7A

Page 1: ...o ICOM SERVICE MANUAL Icom Inc...

Page 2: ...the following four points when ordering roptacennenl parts 1 1 0 digrt order numbers 2 Component part number and name 3 Equipment model name and unit name 4 Quantity required SAMPLE OROER 111DQ027D0 S...

Page 3: ...CUITS 4 3 4 4 POWER SUPPLY CIRCUITS 4 4 4 5 OTHER CIRCUITS 4 4 4 6 PORT ALLOCATIONS 4 5 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PLL AND TRANSMITTER ADJUSTMENT 5 1 5 2 RECEIVER ADJUSTMENT 5 3 SECTION 6 PAR...

Page 4: ...ojections not included Weight RF output power at 13 5 V DC Modulation system Max frequency deviation Spurious emissions External mic connector Receive system Intermediate frequencies Sensitivity Squel...

Page 5: ...seSF VRF f051 aSCS226 tat IF iilt r FI401 FL 244 2nd IF litter FhOl CFWM450E 2F UNIT locoled under side of lliese points LOGIC UNIT CPU system ck ck Xl CR S34 S MflWIHz CPU ICI tJl3S267MeL Spea ief in...

Page 6: ...the point 0 then remove the 2F unit with the contact base Disconnect J1 on reverse side of the 2F unit to remove Contact base Rear panel I Removing LOGIC unit Unscrew 4 screws 3 from the LOGIC unit Un...

Page 7: ...er Q202 and are then applied to the 1st mixer circuit Q401 Common circuits with VHF band are used later stage from the 1 St mixer 4 1 5 1 ST MIXER AND 1 ST IF CIRCUITS 2F UNIT The mixer circuit conver...

Page 8: ...an MM RM signal from pin 44 This signal controls the AF mute switch 01 0 to cut the AF signal line 4 2 TRANSMITTER CIRCUITS 4 2 1 MICROPHONE AMPLIFIER CIRCUIT LOGIC AND 2F UNIT The microphone amplifi...

Page 9: ...unit The PSET voltage is controlled by power set pots R302 for VHF R304 for UHF and an H L signal via the CPU LOGIC unit pin 56 A thermistor R266 controls APC reference voltage PREF voltage to reduce...

Page 10: ...e is supplied to the 3C R3 and T4 regulator circuits etc 3C Common 3 V converted from the VCC line by the 3C regulator circuit LOGIC unit Q4 Q5 using the 3CPU regulator LOGIC unit IC2 R3 3 V for recei...

Page 11: ...KR0 Input ports for key matrix 32 PTT Input port for the PTT control circuit HIGH When transmitting Pin number Port name Description 33 RESET Input port for reset circuit LOGIC unit IC3 39 CFC Outputs...

Page 12: ...h Transmitting Top panel Connect an RF power meter to the antenna connector 4 0 W 2F R302 2 Displayed frequency 445 000 MHz USA version 435 000 MHz Other versions Output power High Transmitting 3 0 W...

Page 13: ...al multimeter or oscilloscope to the CPI 1 0 V 2F LI 02 SQUELCH LEVEL 1 Displayed frequency any Connect an SSG to the antenna connector and set as Level 0 11 pV 126dBm Mod 1 kHz 3 5 kHz Dev Pre set th...

Page 14: ...F unit ULV PLL lock voltage check point for UHF L303 PLL lock voltage adjustment for VHF Located on the underside of the 1 F unit L301 PLL lock voltage adjustment for UHF VLV PLL lock voltage check po...

Page 15: ...363 7030005110 S RESISTOR ERJ2GEJ 224 X 220 kQ R384 7030005110 S RESISTOR ERJ2GEJ 224 X 220 kQ R365 7030007280 S RESISTOR ERJ2GEJ 331 X 330 Q R386 7030005050 S RESISTOR ERJ2GEJ 103X lOkQ R367 70300050...

Page 16: ...8L C9 4030011640 S CERAMIC C1005CH 1E010B T A C713 4030006860 S CERAMIC C1608 JB 1H 102K T A CIO 4030009710 S CERAMIC C1005CH 1E070D T A C714 4030006860 S CERAMIC C1608 JB 1H 102K T A C11 4030011640...

Page 17: ...RESISTOR ERJ2GEJ 224 X 220 kQ R320 7030004990 S RESISTOR ERJ2GEJ 221 X 220 Q R401 7030007250 S RESISTOR ERJ2GEJ 220 X 22 Q R321 7030004980 S RESISTOR ERJ2GEJ 101 X 100 Q R404 7030007260 S RESISTOR ERJ...

Page 18: ...TOR RR0510R 683 D 68 kQ R52 7030005090 S RESISTOR ERJ2GEJ 104 X 100 kQ R53 7030005590 S RESISTOR ERJ2GEJ680X 68 Q R54 7030004980 S RESISTOR ERJ2GEJ 101 X 100 Q R55 7030007280 S RESISTOR ERJ2GEJ 331 X...

Page 19: ...S CERAMIC C1608 JB 1C473K T A C153 4550003080 S TANTALUM TEMSVA 1A 335M 8L 2F UNIT REF NO ORDER NO DESCRIPTION Cl 54 4030011320 S CERAMIC C1005 CH 1E470J T A Cl 55 4030009810 S CERAMIC C1005 JB IE 102...

Page 20: ...H03A3AS4X0AA 473 R148 7030003540 S RESISTOR ERJ3GEYJ 682 V 6 8 kQ R149 7030003320 S RESISTOR ERJ3GEYJ 101 V 100 Q R151 7030003590 S RESISTOR ERJ3GEYJ 183 V 18 kQ R152 7030003650 S RESISTOR ERJ3GEYJ 56...

Page 21: ...30009810 S CERAMIC C1005 JB IE 102K T A W1 8900005320 FFC OPC 519 C83 4030009810 S CERAMIC C1005 JB IE 102K T A W2 9045995030 WIRE 71 98 020 X98 X98 C84 4030009810 S CERAMIC C1005 JB IE 102K T A C87 4...

Page 22: ...81 0 DIAL7VOL 1 PA BOARD REF NO ORDER NO DESCRIPTION QTY MP401 8410002030 1810 PA heat sink 1 DUAL VCO BOARD REF NO ORDER NO DESCRIPTION QTY MP301 8510010370 1810 VCO case 1 2F UNIT REF NO ORDER NO D...

Page 23: ......

Page 24: ...C I MP19 C J902 1F MP401 PA J901 IF MP28 C MP20 C MP30 C J903 1F MP15 C M301 D 1FUNIT MP3 C MP15 C MP14 C MP29 C MP18 C MP17 C MP11 C Unit abbreviations C CHASSIS PARTS 1 F 1 F UNIT PA PA BOARD 2F 2F...

Page 25: ...ET S 2SA1588 GR Symbol ZG 2SC5108 Y Symbol MC 2SC5226 4 Symbol LN4 Symbol B1201 2SB1462 R Symbol BR 2SC4215 0 Symbol QO 2SC5006 T1 Symbol 24 2SD2216 Symbol Y 2SJ3S4Q Symbol 4MQ HAT1004F EL Symbol 5G2...

Page 26: ...DIODES DA112 Symbol AZ DA113W Symbol AY DAP202U Symbol P MA132WA Symbol MO MA132WK Symbol MU MA133 Symbol MP MA6S121 Symbol M2D SB07 03C TB Symbol J 8 1...

Page 27: ...SECTION 9 BOARD LAYOUTS 9 1 LOGIC UNIT 9 1...

Page 28: ...Thie combinalbn of this pa je and the next page show the unit layout in the same configuration as he acluat P C eoarii...

Page 29: ...UK JA CE3 USA CE8 AUS SEA m E...

Page 30: ...TO 2FUNIT J2 2...

Page 31: ...2 2F UNIT 2FU t T The combination of this page and the next page shpi he unil layout in the same configuralion as the actual P C Board DUAL VCO BOARD FROM IF UNIT FROt 1 1 F UNtT 9 3 TO LOGIC UNIT Jt...

Page 32: ...TO IF UNIT J904 2FUNtT DUAL VCO BOARD FROM IF UNIT r FROM I F UNIT 9 4 TO IF UNIT J90S...

Page 33: ...f xl page show Ihe unit layout in the same oonfiguration as die actiiat P C Board J9CM LO TWIC AF Pc U jOD UsTTSP dND AFO VMC D fliMOTe PLST TXSEL PICK 3PP PPA UL PICK GND A Pi aNDLO P3E7 atvCC WUNE...

Page 34: ...1FUNIT 9 6...

Page 35: ...SECTION 10 BLOCK DIAGRAM 10 1...

Page 36: ...ERSION FRE31 JencV TX RX EUR 144 146 430 440 144 146 430 440 ITA 140 150 430 440 136 174 400 470 USA 140 150 440 450 118 174 400 470 AUS 144 148 430 440 144 148 430 440 SEA 140 150 430 440 118 174 430...

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Page 39: ...11 2...

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Page 42: ...0 001 22nH 22nH J CeiiJ o 85 VHF TX OV VHF RX 1 5V R63 VHF TX 0V I lOk VHF RX 3 1V R61 0101 10k MA2S077 0 001 p y C65 ip S i EXTMIC AF SPE UMOD rz inT P GND PI AFO VMOD r REMOte PLST o PLCK r nlUD r...

Page 43: ...ada A Division of Icom America Inc 3071 5 Road Unit 9 Richmond B C V6X 2T4 Canada Phone 604 273 7400 Fax 604 273 1900 Icom Europe GmbH Communication Equipment Himmelgeister Str 100 D 40225 Dusseldorf...

Page 44: ...omit on us Icom Inc 6 9 16 Kamihigashi Hirano ku Osaka 547 Japan A 5374KA S Printed in Singapore Copyright 1996 by Icom Inc...

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