Icom IC-A14 Service Manual Download Page 25

Page: 25 / 28

9 - 3

*; Refer to “PARTS LIST.”

330K

R293

R43

220K

R53

220K

R63

100

R69

R49

100

R335

0.001

C67

220K

R311

R72

470

0.01

C97

330K

R194

C176

10P

C85

R54

220K

R277

0.001

C82

R61

10K

R48

330K

0.001

C328

0.001

C68

R64

100

0.001

C65

0.001

C84

0.001

C87

0.15U

L82

0.001

C93

0.01

C95

R45

47K

0.001

C61

0.001

C364

0.001

C57

R44

82K

0.001

C365

1SS400

D31

0.01

C323

C110

150K

R195

0.001

C191

0.001

C120

0.001

C69

0.001

C81

0.001

C83

10 MSVA

C37

0.001

C718

0.001

C720

C721

0.1

C724

0.1

C725

0.01

C726

0.01

C727

JTBM450CX24

C732

100

R784

22K

R785

R786

0.01

C733

100K

R787

R788

NJM2552V

IC1

OSC[B]

OSC[E]

MIX_OUT

GND

AM_IF_IN

AM_DEC

FM_IF_IN

FM_DEC

FM_IF_OUT

QUAD_IN

FM_AM_OUT

AMP_IN

AMP_OUT

AM_AF_OUT

AM_SW

RSSI_OUT

RF_AGC_OUT

AM_AGC_IN

V+

M IX_IN

C735

R791

C738

0.01

C739

MA2S728

D79

100K

R798

0.01

C390

C391

82P

C394

0.001

C743

0.001

C90

R68

47K

330

R799

330

R350

3SK324

Q12

82P

C731

TP76N00N

R824

UNR9213 J

Q85

47P

C770

10K

R789

0.0033

C771

M A2S077

D17

R336

0.001

C777

68N

L93

15P

C776

12P

C80

R60

68K

L24

0.82U

470K

R790

2.2K

R793

10K

R792

470P

C736

470P

C737

L52

C2012C

C235

L18

C2012C

10P

C58

0.00

C60

HVC375B

D13

C2012C

L69

HVC375B

0.001

C327

18P

C62

C782

R51

270

L21

C2012C

C66

R52

470

HVC350B

D14

0.001

C71

C325

L22

C2012C

HVC350

D15

0.001

C75

0.001

C193

18P

C78

100K

R832

0.01

C361

CP7

CP8

CP9

CP10

CP11

CP12

2721

MP 3

10K

R840

0.01

C785

CP14

CP13

CP15

CP19

CP18

CP17

CP16

CP06S

CP20

CP06S

CP21

CP06S

CP22

CP06S

CP23

CP06S

CP20

CP2

CP25

CP26

CP2

R847

CP27

CP28

C121

C326

2.5P

C73

C781

0.3P

C780

R783

Q13

2SC5006

2SC4738

Q80

39P

C728

C729

2927

MP 8

0.01

C793

0.001

C794

FL-417

FI3

OUT

GND

5 6

0.001

C796

12P

C86

0.01

C744

0.047

C734

12K

R272

R62

180K

R59

100K

R66

680

R65

220

DA221

C740

R73

47K

R337

0.0047

C797

3SK293

Q11

C329

0.01

C800

2.2K

R874

MA2S728

D89

CFWM450D

FI2

0.001

C801

1SV30

D75

R794

C802

MA2S728

D90

10K

R772

R775

R776

WXC

VOL2

VOL3

AGCOF

DETO

T:0.0V

R:4.6V

T:0.0V

R:4.5V

T:0.0V

R:1.8V

RF AGC

VCC

RSSI

FMDET

TXLO

TXV

AM DET

R5S

RF AGC

1st IF

2nd LO

RSSI

NOISE

GND

POW

MOD

RFDETV

MO D

POW

REFV

GND

APC

REFV

PA UNIT

(page 11-4)

TXV

GND

POW

MOD

RFDETV

ANT UNIT

(page 11-4)

LPF

GND

AN T

DC UNIT

(page 11-4)

BATT +

BATT -

GND

T:0.0V

R:4.5V

T:0.0V

R:2.2V

(No RX signals)

COMMON

CONTROL

MAIN UNIT (Right side)

Summary of Contents for IC-A14

Page 1: ...S 14417XZ C1 Jan 2008 VHF AIR BAND TRANSCEIVER ...

Page 2: ...C A14 MAIN UNIT 5 pieces 8820001210 Screw 2438 screw IC A14 Top cover 10 pieces Addresses are provided on the inside back cover for your convenience Icom Icom Inc and logo are registered trademarks of Icom Incorporated Japan in the United States the United Kingdom Germany France Spain Russia and or other countries ORDERING PARTS 1 Make sure the problem is internal before disassembling the transcei...

Page 3: ... 4 1 4 2 TRANSMITTER CIRCUITS 4 3 4 3 FREQUENCY SYNTHESIZER CIRCUITS 4 4 4 4 PORT ALLOCATIONS 4 5 4 5 VOLTAGE BLOCK DIAGRAM 4 6 SECTION 5 PARTS LIST SECTION 6 MECHANICAL PARTS SECTION 7 BOARD LAYOUTS SECTION 8 BLOCK DIAGRAM SECTION 9 VOLTAGE DIAGRAM MAIN UNIT Left side 9 1 MAIN UNIT Center 9 2 MAIN UNIT Right side 9 3 DC PA AND ANT UNITS 9 4 ...

Page 4: ...ing 70 to 100 Frequency stability 5 ppm Audio harmonic distortion Less than 10 at 60 mod Hum and noise ratio More than 35 dB Spurious emissions More than 46 dB except operating frequency 62 5 kHz range External MIC connector 3 conductor 2 5 d mm 1 10 150 Ω P Receiver Receive system Double conversion superheterodyne Intermediate frequencies 1st 46 35 MHz 2nd 450 kHz Sensitivity COM band 6 dB S N 6 ...

Page 5: ...MP FILTER IC18 LMV324IPW DAC IC17 M62363FP 2nd IF FILTER FI2 CFWM450D POWER AMP Q2 RD12MVS1 TX and RX VCOs CPU IC26 uPD780338 TOP VIEW MAIN UNIT BOTTOM VIEW BOTTOM VIEW PLL IC IC29 MB15E03SL IF IC IC1 NJM2552V CPU CLOCK X3 CR 867 DATA I O INVERTER IC33 TC7W04FU DRIVE AMP Q3 RD01MUS1 PRE DRIVE AMP Q4 2SC3775 EEPROM IC25 S 24CS64A0I ...

Page 6: ...m the side plate then remove it r Unscrew total of 4 screws from the MAIN UNIT t Unsolder total of 12 points which connecting PA UNIT then remove the MAIN UNIT from the CHASSIS 2 Removing the MAIN UNIT q Remove the seal VR nut and VR plate from the CHASSIS assembly Chassis assembly 2 screws Speaker connector Speaker cable Jack panel Antenna nut VR knob Front panel Seal VR nut VR plate Chassis asse...

Page 7: ...W D17 and ATT R63 335 336 The converted 1st IF signal is passed through the 1st IF filter FI3 to be removed unwanted signals and amplified by the 1st IF AMP Q13 The amplified 1st IF signal is then applied to the 2nd IF circuit RF AND 1ST IF CIRCUITS 2ND IF CIRCUIT 2ND IF AND DEMODULATOR CIRCUITS The 2nd IF circuit consists of 2nd mixer 2nd IF filter 2nd IF amplifier And it converts the 1st IF sign...

Page 8: ...MC1 D67 Q 79 Q86 IC15 Q52 Q82 Q83 Q36 IC31 I C18a I C18b I C18c Control lines from the CPU IC26 IC18d DA2STB SCK SDATA DA2STB SCK SDATA D A2STB SCK SDATA ALC AMP IC20 MIC VR DAC VOLUME DAC AGC Automatic Gain Control CIRCUITS For receiving AM signals The AGC circuit effectively reduces the RX signal level if the signal is strong and raises it when it is weaker The AGC circuit detects the overall st...

Page 9: ...ontrols the bias of the driver and power amplifiers to reduce increase the gain of these amplifiers for stable TX output power ANTENNA LPF ANT SW PWR AMP DRIVE PRE BPF RF AMP AGC AMP AMP ATT LPF LPF APC AMP DRIVE AMP T1 T2 POWER DET Q2 Q3 Q4 IC27 D2 D3 D74 D1 D8 D75 BEF L52 C235 D13 50 Q10 Q11 326 R36 38 HV TXV MOD 4 3 1 1 PCON ATT signal D75 D76 D77 PA UNIT MAIN UNIT LPF L1 45 C210 212 L3 C5 7 L5...

Page 10: ...and programmable divider In the same way the reference frequency signal from the TCXO is applied to the PLL IC and divided so that these two applied signals are the same frequency The divided and frequency matched signals VCO output and the reference frequency signals are applied to the phase comparator and phase compared The resulted phase difference is detected as a phase type signal and level a...

Page 11: ...er Q75 76 control signal OUT High Backlight is ON LIGHT LIGHT key input IN Low While the key is pushed JACKDET Ext speaker conection detect IN High Ext speaker is connected EXTREGC EXT MIC regulator Q25 26 control signal OUT High While an ext microphone is connected While the VOX circuit is activated Low KS0 KS3 Strobe signals for key matrix OUT Low All the time Low INI Initial matrix return signa...

Page 12: ...ed CPU3 6V Regulator Battery pack R5S SW CPU IC26 5V Regulator VCO SW TX VCO Q59 D45 46 VIN VCC IC22 Q70 71 Q20 90 Q57 Q25 26 Q75 76 Q7 8 CPU3 6V PCON R5C AF PWR AMP Controller AFC TXV Regulator TXC Backlight driver EXT Regulator EXTREG LIGHTC Common 5V PLL IC IC29 Reference oscillator X5 Noise AMP IC28 etc RX 5V IF IC IC1 RF AMP Q11 1st IF AMP O13 etc RX VCO Q58 D38 48 Logic 3 6V EEPROM IC25 Rese...

Page 13: ...C 68NG A B 86 5 37 7 L22 6200009930 S COL C2012C 68NG A B 87 31 2 L24 6200007850 S COL ELJNC R82K F T 88 27 L38 6200009351 S COL ELJRE R22GFA B 80 5 23 7 L52 6200009890 S COL C2012C 82NG A B 98 9 35 L55 6200007001 S COL ELJRE 82NGFA B 86 3 15 6 L57 6200010540 S COL C2012C 47NG A B 69 7 30 6 L58 6200003550 S COL MLF1608A 4R7K T B 71 5 28 4 L63 6200009920 S COL C2012C R10G A B 72 8 34 2 L64 62000110...

Page 14: ... T 90 9 31 R778 7030005050 S RES ERJ2GEJ 103 X 10 k B 95 4 31 9 R779 7030005090 S RES ERJ2GEJ 104 X 100 k T 85 8 33 6 R780 7030005050 S RES ERJ2GEJ 103 X 10 k T 89 2 33 5 R783 7030005120 S RES ERJ2GEJ 102 X 1 k B 78 5 12 6 R784 7030004980 S RES ERJ2GEJ 101 X 100 T 84 15 6 S Surface mount MAIN UNIT REF ORDER DESCRIPTION M H V NO NO LOCATION R785 7030005220 S RES ERJ2GEJ 223 X 22 k T 79 6 10 9 R786 ...

Page 15: ...C394 4030017680 S CER ECJ0EC1H820J T 86 14 3 C409 4030017460 S CER ECJ0EB1E102K B 101 5 37 3 C410 4030017460 S CER ECJ0EB1E102K B 96 8 35 9 S Surface mount MAIN UNIT REF ORDER DESCRIPTION M H V NO NO LOCATION C411 4030017460 S CER ECJ0EB1E102K T 97 37 7 C412 4030017460 S CER ECJ0EB1E102K B 94 8 37 3 C413 4030017460 S CER ECJ0EB1E102K B 101 6 26 1 C414 4030017460 S CER ECJ0EB1E102K T 85 5 26 6 C415...

Page 16: ...39NGFA B 15 3 14 1 L11 6200005741 S COL ELJRE 47NGFA B 11 10 3 L12 6200007001 S COL ELJRE 82NGFA B 8 8 9 5 L15 6200002380 S COL LQW31HN56NJ03L B 29 2 15 9 L46 6200012870 S COL 0 30 1 4 5TR 23 5N COMO T 25 3 13 8 R2 7030000290 S RES MCR10EZHJ 180 181 B 33 9 12 R3 7030005090 S RES ERJ2GEJ 104 X 100 k T 26 3 20 6 R4 7030005120 S RES ERJ2GEJ 102 X 1 k T 27 2 20 3 R5 7030005050 S RES ERJ2GEJ 103 X 10 k...

Page 17: ...017420 S CER ECJ0EC1H470J B 15 6 17 2 J1 6910017680 CNR IMSA 9230B 1 04Z140 PT1 J2 6910017680 CNR IMSA 9230B 1 04Z140 PT1 J3 6910017680 CNR IMSA 9230B 1 04Z140 PT1 ANT UNIT REF ORDER DESCRIPTION M H V NO NO LOCATION L1 6200012910 S COL 0 35 1 6 8TL 45 5N T 3 6 12 1 L45 6200013110 S COL 0 35 1 6 9TL 52 0N T 3 5 8 3 R338 7030005080 S RES ERJ2GEJ 823 X 82 k T 3 8 14 C210 4030007050 S CER C1608 CH 1H ...

Page 18: ... 1 MP33 8930046020 1123 SHEET A 1 1 MP34 8930056540 PUSH SPRING AH 2 MP35 8830001701 VR NUT Q 1 1 MP36 8930048870 2056 A SPONGE 1 MP37 8930070010 2893 VOL RUBBER 1 MP42 8210022780 2927 JACK PANEL 1 MP43 8810004861 SCREW PH M2X6 ZK3 2 MAIN UNIT ACCESSORIES PA UNIT REF ORDER DESCRIPTION QTY NO NO J2 6450000131 HSJ1102 018540 1 J3 6510016381 52465 1071 1 J4 6510021901 BM02B ASRS TF LF SN 1 J5 6450002...

Page 19: ...P13 C MP14 C MP26 C MP27 C MP27 C MP9 C MP10 C J2 C J2 M J3 M MC1 M S23 M W1 C MP32 C UNIT abbreviations C CHASSIS PARTS M MAIN UNIT P PA UNIT DC DC UNIT A ANT UNIT MP37 C MP21 C MP22 C MP34 C MP34 C MP36 C MP16 C MP24 C MP25 C J702 P MP9 M 120 4 23 32 3 7 9 64 15 4 39 64 53 2 3 32 17 8 45 64 32 5 1 9 32 38 9 1 17 32 1 7 1 16 5 2 13 64 1 7 1 16 2 4 3 32 167 6 37 64 Unit mm inch MP2 C MP12 C The sh...

Page 20: ...9 FI3 IC1 IC2 IC28 IC29 IC31 J4 L24 L82 L87 L88 MC1 Q10 Q13 Q20 Q21 Q33 Q36 Q57 Q80 Q81 Q82 Q83 Q84 Q85 Q90 R46 R68 R69 R72 R73 R74 R92 R99 R100 R101 R102 R107 R130 R133 R134R135 R142 R145 R147 R148 R149 R150 R252 R253 R254 R280 R281 R282 R307 R308 R325 R337 R349 R350 R351 R352 R759 R775 R776 R777 R779 R780 R784 R785 R787 R788 R789 R790 R791 R792 R793 R794 R795 R796 R797 R798 R799 R800 R801 R813 R...

Page 21: ...7 D85 D86 D87 EP8 EP13 EP14 FI2 FI2 IC15 IC17 IC18 IC20 IC21 IC22 IC24 IC25 IC26 IC32 IC33 J2 J3 J5 L18 L21 L22 L38 L52 L55 L57 L58 L63 L64 L67 L69 L71 L72 L91 L92 L93 MP3 Q7 Q8 Q11 Q12 Q25 Q26 Q28 Q29 Q50 Q51 Q52 Q58 Q59 Q60 Q70 Q71 Q75 Q76 Q79 Q86 Q88 Q89 Q91 Q92 R36 R37 R38 R39 R40 R43 R44 R45 R48 R49 R51 R52 R53 R54 R59 R60 R61 R62 R63 R64 R65 R66 R108 R109 R111 R114 R115 R117 R118 R119 R120 R...

Page 22: ...3 D50 HVC375B Q10 2SC4738 Q11 3SK293 D14 D15 HVC350 Q12 3SK324 Q13 2SC5006 15 300MHz IC29 MB15E03SL REG Q7 2SB1132 Q 8 XP1501 R5S IC1 NJM2552V Q21 UNR9210 D82 MA2S728 IC2 TC4W53FU REG TXV R5S Q 20 UNR9115 Q25 2SA1576 D23 MA133 Q 26 UNR9213 Q 50 UNR9111 D36 MA2S111 Q51 UNR9213 ECM MC1 EM6027P D67 MA8051 Q 79 UNR9213 Q86 IC15 Q52 XP4315 Q82 2SB1132 Q36 XP1501 IC31 TDA8547TS I O CLONE BATT V DETECT D...

Page 23: ...4 SEG4 5 SEG5 6 SEG6 7 SEG7 8 SEG8 9 SEG9 10 SEG10 11 SEG11 12 SEG12 13 SEG13 14 SEG14 15 SEG15 16 SEG16 17 SEG17 18 SEG18 19 SEG19 20 SEG20 21 SEG21 22 SEG22 23 SEG23 24 SEG24 25 SEG25 26 SEG26 27 SEG27 28 SEG28 29 SEG29 30 SEG30 31 SEG31 32 SEG32 33 SEG33 34 SEG34 35 COM1 36 COM2 37 COM3 38 COM4 UPD78F0338GC IC26 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31...

Page 24: ...EP19 4 7K R234 2SC4116 Q86 Q33 2SC4116 100 C195 100 C221 47 R829 0 001 C769 0 01 C331 R120 150K R119 2 2K Q25 2SA1576 2SC5006 Q58 2SC5006 Q59 2SC5006 Q60 33P C310 33P C306 33P C338 470 R256 4 7U L91 10U L72 0 75P C316 0 75P C317 39P C335 4 7U L58 10U L71 HVC376B D45 HVC376B D46 1SV307 D6 33 C184 33 C250 100 C130 0 R837 4P C773 C2012C L63 68P C302 2P C774 C2012C L57 MA2S304 D38 MA2S304 D48 6P C307 ...

Page 25: ...6 470P C737 L52 C2012C 4P C235 L18 C2012C 10P C58 0 001 C60 HVC375B D13 C2012C L69 HVC375B D50 0 001 C327 18P C62 2P C782 R51 270 L21 C2012C 1 C66 R52 470 HVC350B D14 0 001 C71 3P C325 L22 C2012C HVC350B D15 0 001 C75 0 001 C193 18P C78 100K R832 0 01 C361 CP7 CP8 CP9 CP10 CP11 CP12 2721 MP3 1 2 3 10K R840 0 01 C785 CP14 CP13 CP15 CP19 CP18 CP17 CP16 CP06S CP20 CP06S CP21 CP06S CP22 CP06S CP23 CP0...

Page 26: ... 22P C14 9230B 1 04Z140 PT1 J1 1 2 3 4 0 01 C352 22P C13 L5 54N 0 001 C31 0 01 C350 3P C6 0 001 C8 22P C7 0 001 C25 27P C5 0 001 C10 L15 56N 2681 MP 1 150P C297 L6 3 4N R3 100K L10 39N 15P C792 47P C712 R17 22K 120 R20 3074 MP2 1 2 0 0022 C23 1 5P C15 1 5P C11 1 5P C713 R4 1k 82K R767 0 1 C764 0 001 C429 47P C793 0 001 C24 47P C794 47P C795 47P C796 0 R845 0 R846 33P C791 33P C797 RFDETV TO ANT UN...

Page 27: ...Glenwood Centre 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 Unit 1 103 Garden Road Clayton VIC 3168 Australia Phone 61 03 9549 7500 Fax 61 03 9549 7505 URL http www icom net au E mail sales icom net au 146A Harris Road East Tamaki Auckland New Zealand Phone 64 09 274 4062 Fax 64 09 274 4708 URL http www...

Page 28: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14417XZ C1 2008 Icom Inc ...

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