Icom IC-F2721 Service Manual Download

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9 - 1

SECTION 9

BOARD LAYOUTS

H10

H15

H20

H25

H30

H35

H40

H45

H50

H55

H60

H65

H70

H75

H80

H85

H90

H95

H100

H105

H110

H115

V10

V15

V25

V30

V35

V20

V40

to MIC JACK

CLO

PTT

MIC

CLI

AFO

MICE

GND

AF VOLUME

DIAL

9-1 FRONT-A UNIT (for IC-F2700 Series)

• TOP VIEW

The combination of this page and the next page shows
the unit layout in the same configuration as the actual
P.C. Board.

Summary of Contents for IC-F2721

Page 1: ...SERVICE MANUAL UHF MOBLE TRANSCEIVERS...

Page 2: ...00mW to the antenna connector This could damage the trans ceiver s front end REPAIR NOTES 1 Make sure a problem is internal before disassembling the transceiver 2 DO NOT open the transceiver until the...

Page 3: ...T 5 5 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS AND DISASSEMBLY SECTION 8 SEMI CONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 1 FRONT A UNIT for IC F2700 Series 9 1 9 2 FRONT B UNIT for IC F280...

Page 4: ...2 5 kHz Narrow 4 0 kHz Middle 5 0 kHz Wide Spurious emissions 75 dB typical 0 25 W 1 GHz 1 0 W 1 GHz Adjacent channel power 60 dB min Narrow 70 dB min Middle Wide Audio frequency response 2 dB to 5 d...

Page 5: ...amic filter FI2 CFWLB450KGFA for narrow RF amplifier Q24 3SK293 D A converter IC30 M62334FP D A converter IC8 M62364FP PLL IC IC4 LMX2352TM FM IF IC IC12 TA31136FN DTMF decoder IC6 LC73872M YGR amplif...

Page 6: ...AN6123MS Mic amplifier IC5 TC75S51F LCD driver IC7 SED1526F0A Reset IC IC2 S 80942CNMC Mic switch IC8 TC4W53F Q3 2SC4116 Q4 DTC114TU Q5 DTC114TU Front CPU IC3 HD64F3687 Mic switch IC8 TC4W53F ALC amp...

Page 7: ...unit in the direction of the arrow REMOVING THE MAIN UNIT 1 Remove the bushing L w Remove the MAIN unit in the direction of the arrow J1 A B C D D L E F BEFORE REMOVING THE MAIN UNIT 1 Unscrew 8 scre...

Page 8: ...are applied to the 1st mixer circuit D17 D18 D23 D26 D68 and D69 employ varactor diodes that are controlled by the Main CPU IC23 via the D A converter IC30 pins 1 2 to track the bandpass filter These...

Page 9: ...the base band IC IC2 The output signals from the base band IC IC2 pin 20 are passed through the RX PA switch IC43 pins 1 15 and DIG ANA switch IC42 pins 3 4 The signals are applied to the AF volume IC...

Page 10: ...ed VCO signal is amplified at the buffer amplifiers Q20 Q22 and is then applied to the YGR Q23 amplifier via the T R switch D19 The CTCSS DTCS signals CENC0 CENC1 CENC2 from the Main CPU IC23 pins 89...

Page 11: ...SSO SCK 4 Q12 D9 D13 RX VCO2 Q11 D7 D11 RX VCO1 TX VCO Q16 D70 D71 6 10 14 15 16 PLL control signals from CPU IC23 15 3 MHz reference signal from reference frequency osciilator X2 IC4 LMX2352TM Shift...

Page 12: ...he audio signals The signals pass through or bypass scrambler section and are then applied to the limiter section after being passed through the high pass filter The filtered signals pass through the...

Page 13: ...l for the power switch circuit Q41 Q42 Low While power ON 43 SENC Outputs single tone encoder signal Pin number Port name Description 44 BEEP Outputs beep audio signals 45 SDEC Input port for single t...

Page 14: ...e Description 1 T1 Outputs the bandpass filters D23 D26 D68 D69 tuning signal 2 T2 While receiving Outputs the bandpass filters D17 D18 tuning signal While transmitting Outputs the TX power control si...

Page 15: ...ld Wiz ard Complete will appear Then click Finish u Eject the CD i The adjustment software icon appears on the desk top screen BEFORE STARTING SOFTWARE ADJUSTMENT Program the adjustment frequencies in...

Page 16: ...ce frequency 1 Receive sensitivity automatic 2 Receive sensitivity manual 3 PLL lock voltage preset for RX automatic 4 PLL lock voltage preset for TX automatic 5 S meter FM 6 S meter digital 7 Deviati...

Page 17: ...nna connector RF power meter 50 1 75 W DC power supply 13 6 13 2 V 20 A Frequency counter PC to the MIC connector to an RS 232C port JIG CABLE RS 232C cable straight IC F2721 D IC F2821 D IC F2710 IC...

Page 18: ...H CH 1 FRONT A B C o n n e c t a d i g i t a l multimeter or an oscillo scope to the check point CONTRAST 2 0 V FRONT A B R59 Preset LCD contrast 64 user set mode Receiving FRONT A UNIT for IC F2700 s...

Page 19: ...sor to RX LVA TX LVA and then push ENTER key REFERENCE FREQUENCY REF 1 Operating CH CH 12 Connect an RF power meter or 50 dummy load to the antenna connector Transmitting Rear panel Loosely couple a f...

Page 20: ...ear panel Connect a modulation analyzer with an oscilloscope to the antenna connector through an attenuator Set to square wave form FM DEVIATION NARROW MOD N C 1 Operating CH CH 6 Connect an audio gen...

Page 21: ...21D only 2 Operating CH CH 3 Transmitting MOD Dig H IC F2721D F2821D only 3 Operating CH CH 14 Transmitting CTCSS DTCS DEVIATION CTCSS DTCS 1 Operating CH CH 4 No audio applied to the MIC connector Se...

Page 22: ...PF tuning Digital RSSI Dig RSSI IC F2721D F2821D only 1 Operating CH CH 3 Connect the SSG to the antenna connec tor and set as Frequency 400 000 MHz L 450 000 MHz H Level 0 16 V 123 dBm Modulation OFF...

Page 23: ...1 6 C65 4030016930 S CER ECJ0EB1A104K B 52 31 6 C66 4030017490 S CER C1608 JB 1A 105K T B 51 6 26 3 C67 4030017490 S CER C1608 JB 1A 105K T B 51 6 24 8 C68 4030017460 S CER ECJ0EB1E102K B 50 7 21 7 C6...

Page 24: ...7 3 9 R62 7030004980 S RES ERJ2GEJ 101 X 100 B 26 10 1 R63 7030005160 S RES ERJ2GEJ 105 X 1 M B 31 2 4 3 R64 7030005220 S RES ERJ2GEJ 223 X 22 k B 29 2 10 1 R65 7030007290 S RES ERJ2GEJ 222 X 2 2 k B...

Page 25: ...90 S IC TA31136FN D EL B 27 9 28 4 IC13 1110005290 S IC NJM2115V TE1 F2721D F2821D only T 87 6 17 2 IC15 1110006230 S IC NJM2711F TE1 F2721D F2821D only B 87 5 19 2 IC16 1190002080 S IC AD7476ARTZ 500...

Page 26: ...NO NO LOCATION FI3 2020001780 S CER CFWCA450KEFA R0 F2721D F2821D only B 78 8 18 5 FI4 2030000410 S MLH FL 380 MFT46 3P 46 350 MHz B 34 3 43 2 FI5 2040001440 S LC NFE31PT152Z1E9L B 85 2 103 6 FI6 204...

Page 27: ...105 7030005000 S RES ERJ2GEJ 471 X 470 B 24 32 R106 7030008290 S RES ERJ2GEJ 473 X 47 k T 109 52 9 R107 7030005040 S RES ERJ2GEJ 472 X 4 7 k T 111 1 54 6 R108 7030005070 S RES ERJ2GEJ 683 X 68 k T 118...

Page 28: ...1D only B 116 2 5 2 R237 7030004980 S RES ERJ2GEJ 101 X 100 B 62 4 64 2 R238 7030005050 S RES ERJ2GEJ 103 X 10 k B 63 2 74 5 R239 7030004980 S RES ERJ2GEJ 101 X 100 B 61 4 74 5 R240 7030005090 S RES E...

Page 29: ...7030005090 S RES ERJ2GEJ 104 X 100 k B 148 75 8 R425 7030007300 S RES ERJ2GEJ 332 X 3 3 k T 25 9 16 1 R426 7030009320 S RES ERJ2GEJ 4R7 X 4 7 T 27 4 19 6 R427 7030005050 S RES ERJ2GEJ 103 X 10 k B 70...

Page 30: ...C124 4550003220 S TAN TEESVA 1E 105M8L B 75 7 51 C125 4030017420 S CER ECJ0EC1H470J B 74 8 54 C126 4030017380 S CER ECJ0EC1H050B B 68 59 C127 4030018860 S CER ECJ0EB0J105K T 76 9 34 7 C128 4030017460...

Page 31: ...6 4030017530 S CER ECJ0EC1H0R5B B 22 1 59 7 C268 4030017530 S CER ECJ0EC1H0R5B L B 24 7 59 3 MAIN UNIT REF ORDER DESCRIPTION M H V NO NO LOCATION 4030017550 S CER ECJ0EC1H1R5B H B 24 7 59 3 C269 40300...

Page 32: ...1H 102K T B 8 9 87 C402 4030006980 S CER C1608 CH 1H 070D T L B 11 87 7 4030007010 S CER C1608 CH 1H 100D T H B 11 87 7 C403 4030017420 S CER ECJ0EC1H470J B 2 1 84 8 C404 4030017420 S CER ECJ0EC1H470J...

Page 33: ...91 5 4030011060 S CER GRM31M2C2H4R0CY21L F2710 H F2810 H T6 5 91 5 4030011070 S CER GRM31M2C2H5R0CY21L F2721 D L F2821 D L T6 5 91 5 C554 4030017550 S CER ECJ0EC1H1R5B H T 62 7 46 3 4030017570 S CER...

Page 34: ...0065250 2781 A lens 1 MP18 8930065240 2781 B lens 1 MP20 8930065170 2781 LED sheet 2 REF NO ORDER NO DESCRIPTION QTY J1 6510004880 Connector MR DS E 01 1 MP1 8010019801 2781 chassis 1 1 MP2 8110008270...

Page 35: ...3 2 4 5 4 5 4 2 4 5 4 2 4 5 4 3ERIES 3ERIES 5NIT MM INCH 2 4 5 4 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 30 0 0 7 7 7 7 0 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 5 4 LACK 2ED 0 0 0 0 0 0 0 0 0 0 0 2 4 5 4 0...

Page 36: ...4L Symbol XY Symbol K1 Symbol UF Symbol U73 Symbol 16 B E C DTC114EUA T106 Symbol 04 B E C DTC114TUA T106 Symbol 04 Symbol 26 Symbol H27 Symbol 9H Symbol 50 Symbol 5N S D G D S G2 G1 PMBFJ310 B C E B...

Page 37: ...00 H105 H110 H115 H0 V0 V5 V10 V15 V25 V30 V35 V20 V40 to MIC JACK CLO PTT MIC CLI 8V AFO MICE GND J2 7 8 1 2 1 3 5 7 2 4 6 8 AF VOLUME DIAL 9 1 FRONT A UNIT for IC F2700 Series TOP VIEW The combinati...

Page 38: ...onfiguration as the actual P C Board H0 V0 H115 H110 H105 H100 H95 H90 H85 H80 H75 H70 H65 H60 H55 H50 H45 H40 H35 H30 H25 H20 H15 H10 H5 V5 V10 V15 V25 V30 V35 V20 V40 to MAIN UNIT AFO MIC POSW MFDA...

Page 39: ...0 H105 H110 H115 H120 H125 H130 H135 H140 H145 H150 H155 H160 H165 H0 1 3 5 7 2 4 6 8 to MIC JACK CLO PTT MIC CLI 8V AFO MICE GND J2 7 8 1 2 AF VOLUME 9 2 FRONT B UNIT for IC F2800 Series TOP VIEW The...

Page 40: ...40 H35 H30 H25 H20 H15 H10 H5 H0 V5 V10 V15 V0 V25 V30 V35 V20 V40 to MAIN UNIT AFO MIC POSW MFDA GND SLQ GND MICE FMDA 8V GND VCC J1 12 11 2 1 9 4 FRONT B UNIT BOTTOM VIEW for IC F2800 series The com...

Page 41: ...1 1 30 16 J2 15 PTTI PTTO MCOT MCIN AUX BUSY MOWN SIG OPT1 OPT2 OPT3 OPV3 OPV2 OPV1 TMS TDI 3VAX TCK EMU1 TRST GND TDO EMUO VCC DIM HORN GND AFO GND DET GND IN GND PTT GND 5V VCC AMMT AFONO BEPO ARMT...

Page 42: ...V50 V55 V40 V65 V70 V75 V60 V80 V90 V95 V100 V85 V105 V110 V115 SP SP EXT SPEAKER 25PIN Connector 1 14 2 15 3 16 4 17 5 18 6 19 7 20 8 21 9 22 10 23 11 24 12 13 25 H_OUT2 TXD RXD RTS CTS GND VCC MMUT...

Page 43: ...5 30 4 6 2 2 6 2 6 2 6 2 2 2 2 6 6 6 6 0 7 2 37 5 02 33 2 0 64 ONLY 4 3 6 0 ONLY 8 62 3 3 3 7 ONLY 1 3 ONLY 1 4 5 1 4 6 3 4 53 4 3 37 4ONE ODULATION 4 33 4 3 ODULATION n 84 84 80 54 28 54 37 2 31 4 34...

Page 44: ...3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 0 0 0 6 8 8 6 2 3 4 34 633 3 3 6 0 7 0 0 7 0 0 0 0 0 0 7 0 0 7 0 0 7 0 0 7 0 42 0...

Page 45: ...34 633 3 3 6 0 7 0 0 7 0 0 0 0 0 0 7 0 0 7 0 0 7 0 0 7 0 42 0 4 7 0 07 0 0 3 0 3 0 4 2 6 0 4 6 0 4 6 0 0 4 0 4 0 4 0 4 0 4 0 4 0 4 0 4 0 0 0 0 3 0 28 0 48 0 0 3 0 28 0 48 0 21 0 21 4 0 21 0 21 42 6 0...

Page 46: ...TXIN 4 TXINO 5 LIMLV 6 EXTLMIN 7 MOD 8 VSS 9 TCLK 10 TDATA 11 DI O 12 RDF FC 13 SCLK 14 DIR 15 XOUT 16 XIN 17 VDD 18 EXPOUT 19 RXAFIN 20 RXAF 21 RXLPFO 22 RXINO 23 RXIN 24 TEST C1 47p C2 47p C26 47p C...

Page 47: ...19 1SV307 D41 MA2S728 FI5 NFE31PT152Z1E9L 1 2 3 FI6 NFE31PT152Z1E9L 1 2 3 FI7 NFE31PT152Z1E9L F2721 D F2821 D only 1 2 3 IC12 TA31136FN 9 10 11 12 13 14 15 16 L25 33nH L35 15nH L38 1H L43 15nH L42 15n...

Page 48: ...ntre 150 6165 Highway 17 Delta B C V4K 5B8 Canada Phone 1 604 952 4266 Fax 1 604 952 0090 URL http www icomcanada com E mail info icomcanada com A B N 88 006 092 575 290 294 Albert Street Brunswick Vi...

Page 49: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14127MZ C1 2005 Icom Inc...

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