Icom Ic-F3gt/gs Vhf Fm Transceiver Service Manual
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10 - 1
SECTION 10 BlLOCK DIAGRAM
ANT
LPF LPFANT
SW D1: MA77
D2: MA77
D8: MA77
Q1: 2SK2974 Q2: 2SK2973 Q3: 2SC5085 Y D3: MA77
D4: MA77
PLL ICQ4: 2SC4215 O Q6: 2SC4215 O IC1: UPD3140GSVCO
Q7: 2SC5085 Y
Q8: 2SC5085 Y REF
X1: CR-664
(15.3 MHz)
OPTION UNIT
J5 AXN330C038
2TONE or 5TONE
PTT
MIC
AF
REG
AF
AMP PTT
CONT
Q17: UN911H
VCC
IC5: TA7368F
FRQCONDBAL
Q15: 2SB1132 R
Q16: XP6501 AB
D26: DAN202KDEV MIC, AF, PTT, MMUT
RMUT, AFONOP
SIGOUT
IF DET IC DETIC2: TA31136FN(D)Q5: 2SC4215 O
FI2
SFPC450G: [Narrow]...](http://img.usermanuals.tech/thumb/2452/82237/w64_icom_ic-f3gt-gs-vhf-porto_manual_d-26.png "Page 27
10 - 1
SECTION 10 BlLOCK DIAGRAM
ANT
LPF LPFANT
SW D1: MA77
D2: MA77
D8: MA77
Q1: 2SK2974 Q2: 2SK2973 Q3: 2SC5085 Y D3: MA77
D4: MA77
PLL ICQ4: 2SC4215 O Q6: 2SC4215 O IC1: UPD3140GSVCO
Q7: 2SC5085 Y
Q8: 2SC5085 Y REF
X1: CR-664
(15.3 MHz)
OPTION UNIT
J5 AXN330C038
2TONE or 5TONE
PTT
MIC
AF
REG
AF
AMP PTT
CONT
Q17: UN911H
VCC
IC5: TA7368F
FRQCONDBAL
Q15: 2SB1132 R
Q16: XP6501 AB
D26: DAN202KDEV MIC, AF, PTT, MMUT
RMUT, AFONOP
SIGOUT
IF DET IC DETIC2: TA31136FN(D)Q5: 2SC4215 O
FI2
SFPC450G: [Narrow]...")
VCC R5 S5 MIC CPU5 VCC 5V T5 R5 S5 VOLIN VOLOUT AFOUT MIC SP VCC CPU5 5V T5 R5 S5 CPU5 S5 T5 R5 CPU5 C223 0.01C224 0.01DR131 470 Q17 UN911H R130 100 C147 0.1 PTT C154 10C8 9 10 IC3C NJM2902V C133 0.1 C209 0.1R177 1 k C125 0.0022 C124 0.01 C217 0.1 R176 3.9 kR93 27 k R109 10 k C134 220 P R104 100 k R266 15 k R108 150 k C132 0.0056 C304 0.0477 6 5 IC3B NJM2902V R96 47 k R94 1 MI/O 1 O/I 2 O/I 3 I/O 4 CONT.B 5 CONT.C 6 VEE 7 I/O8 O/I9 O/I10 I/O11 CONT.D12 CONT.A13 VDD14IC4 BU4066BCFV C131 0.01 C286 0.0022 R95 1 M C126 0.0027R257 1VCC S5 R5 R159 100 k R97 220 k R98 180 k C212 0.01 C213 2.2 C214 0.033R113 68 k R168 10 kR169 10 k [Narrow] 12 k [Wide] R170 10 k C128 1R112 1 M C136 0.0056 R107 150 kVCC R178 3.9 k C129 15 14 13 12 IC3D NJM2902V R120 68 k R145 1 M R99 12 k R100 1.8 k R115 120 k C135 180 P R117 1.5 k R116 1 kD26 DAN202K Q15 2SB1132 R R126 10 k C149 0.1 C146 0.001 C145 10 R122 2.7 k 4 5 6 3 2 1Q16 XP6501 AB C140 0.1 R121 1 k C139 0.1NC 1 VCC 2 NC 3 VIN 4 RIPPLE 5 NF6 PHASE7 PREGND8 PWGND9 POUT10 IC5 TA7368F C171 0.1 R123 3.3 kR128 10 C150 10 R127 33 C151 47 PC152 0.047C153 100 AFOUT DS2 LNJ310M6URA DS3 LNJ310M6URA R204 3.3 k Q25 2SC4116 GR VOLOUT VCC CPU5 CTCIN REMO VOLOUT AFONOP AFON AFOUT TEMPS R182 NTCCM20124AG473JCT R181 100 k C231 0.1 PB0/AN0 1 P97/SEG4075 AVSS 2 TEST 3 X2 4 X1 5 VSS 6 OSC1 7 OSC2 8 RES 9 NMI 10 P20/IRQ4/ADTRG 11 P21/SCK1 12 P22/SI1 13 P23/SO1 14 P24/SCK3 15 P25/RXD 16 P26/TXD 17 P27/IRQ0 18 P17/IRQ3/TMIF 19 P16/IRQ2 20 P15/IRQ1 21 P14 22 P13/TMIG 23 P12/TMOFH 24 P11/TMOFL 25 P67/SEG1651 P70/SEG1752 P71/SEG1853 P72/SEG1954 P73/SEG2055 P74/SEG2156 P75/SEG2257 P76/SEG2358 P77/SEG2459 P80/SEG2560 P81/SEG2661 P82/SEG2762 P83/SEG2863 P84/SEG2964 P85/SEG3065 P86/SEG3166 P87/SEG3267 P90/SEG3368 P91/SEG3469 P92/SEG3570 P93/SEG3671 P94/SEG3772 P95/SEG3873 P96/SEG3974 IC8 HD6473877H R215 100 k R216 100 kC232 0.1 C195 56 PBDET BDET R265 100 k C302 0.1 R103 12 k R146 12 k D14 MA77 TONE CTCSS SIGOUT C123 0.001 OUT 1 VDD 2 VSS 3 NC4 CD5 IC11 S-80942ANMP-DD6 C197 0.1 R148 100 k L33 1.0 µH VOLIN R150 470 SCK SO T1 T2 T3 T4VIN1 1 VOUT1 2 VOUT2 3 VIN2 4 VDD 5 LD 6 CLK 7 DI 8 VIN3 9 VOUT3 10 VOUT4 11 VIN4 12 VIN513 VOUT514 VOUT615 VIN616 DO17 VDAREF18 RESET19 GND20 VIN721 VOUT722 VOUT823 VIN824 IC10 M62363FP-650C VCC C148 0.01 R171 47 k R125 27 k 1 2 456 3 IC6 TK11250BMQ20 DTA144 EU R135 10 k 4 5 6 3 2 1 Q19 XP6501 AB Q18 2SB1132 R R137 100 TONE BEEPOUT VOLIN VOLOUT AFOUTVOLOUT AFOUT CPU5 5V C215 0.1 VOLIN VOLOUT AFOUT S5 VCC T5 T5C R5C R5 R260 10 kR261 10 k MICIN MICOUT CPU5 5V Q22 2SA1577 QQ21 2SA1577 QMICSP MIC C164 0.001 R144 22 K C163 0.001 MC11 2 J6 S3 EXT.MICPTT SWITCH VOL/ PWR SWITCHVOLIN VOLOUT OPT MIC A (VR) C166 0.001R142 100 C282 0.001 J2 C165 0.001 R143 TP76NOON-15F-10KA-2251 UP VCC HV R132 470R141 4.7 kR139 4.7 k C161 0.01C174 22 R174 15 kR140 100 kC294 33 C162 0.01 D27 RB706F-40S5 T5 R5 DN C160 0.01 C159 470 P R134 2.2 k R239 1 kKR3 KR2 KR1 KR0 KS4 C158 10 S2 JPM1990-2013RC155 10 C156 0.1 C248 0.01R221 330 kC244 0.01 R220 270 k R219 120 k R218 120 k Q36 2SC4116 GR R154 470 k R152 470 k R153 470 kC236 0.01C144 0.001 C230 0.022R147 12 k C196 470 P SCK SI SO DASTSCK SI SO DAST A01 A12 A23 VSS4 SDA 5SCL 6WP 7VCC 8 IC7 HN58X2432TI R228 10 k R225 100 kC245 0.01CLOUT CLOUT CLINCLIN NOISNOIS VIN XIN XOUT RESET CSIFT R102 10 R101 1 M C193 8 PC194 15 P X2 CR-663 R226 1 k R232 1 kSEG10 SEG11 SEG12 SEG7 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG8 SEG9 R155 100 R205 1.5 k R237 1 kT5C TXC AFON CTDA2 CTDA1 CTDA0 ESCK ESDA UNLK R236 1 kS5C R5C DUSE OPV3 OPV2 OPV1 MMUT RMUT MMUT RMUT C296 0.001C297 0.001 R246 100 kR245 100 k CONT R193 100 kR194 100 kR195 100 kR196 100 k R235 680 k R241 1 M R242 1 M R243 1 M C199 1 C250 0.01 R207 47 kR234 22 k Q35 2SC4116 GR C227 0.1 Q38 DTC144EU OPT2 OPT1 CTDA0 CTDA1 CTDA2 CCS OPT3 REMCIRQ BUSYOPT2 OPT1 CCS OPT3 CIRQ BUSY R202 47 k R203 47 k R224 27 kR227 47 kR230 56 k R231 22 k R229 180 k C219 0.0082 C228 820 P C216 0.1 R5 T5 R190 22 k R191 22 kR192 22k R197 56 kR198 18 k R201 680 k [Narrow] onlyR164 100 k [F3GT] only R165 100 k [F3GS] only R206 470 k [Wide] only Q33 DTC144EU R213 470 R212 68 kC198 2.2C200 0.033 C201 0.1 C222 0.13 21 4 8 IC12A NJM2904VR211 100 k 5 6 7 IC12B NJM2904V C221 0.039R267 47 k [Narrow] 100 k [Wide] C202 0.01 23 56 89 0#P0 P1 P2 P3 R238 1 k R240 1 k C249 0.01 KS0 KS1 KS2 KS3 S1 S1 JPM1990-2013R 1 4 7 * C169 0.001 Q31 DTC144TU C299 470 EXT.SPAFOUT SP CLONE C173 47 J3 C167 47 PC168 0.001 C283 0.001 BATT GND BDETBDETANT R160 150 L26 3225 µH VCC T5 R13 33 R15 100 T5 VCC R28 100 R27 470C39 0.001R19 100 R21 100 R23 100 C46 0.001 1 3 2 4 5 6 Q11 XP6501 AB R31 1 k R175 1 R151 47 k C233 0.001CP1 (LV check ponit) R30 4.7 k C50 10C300 0.001 C301 0.001 C211 0.1 R185 1 k R45 100 Q34 2SK1069 4 R184 10 k C234 0.001 R186 47 k C63 56 P X1 CR-664 (15.3 MHz) C64 4 PT5 R5 S5VCC C72 1R48 10 k C70 0.01R49 47 kC69 33 P D7 1SV288 C71 0.1 FRQCON AFOUT LVIN DISCIN AFOUT DISCIN AFOUTLVINDBAL5V T5 R5 R5 S5 S5 VCC DISCIN AFOUT 5V LVINT5 R5 R5 S5 S5 VCC DISCIN AFOUT 5V LVINT5 R5 R5 S5 S5R5 S5 VCC DISCIN AFOUT 5V LVIN W8 R50 470 k R51 100 k S5 R5 S5 5V R5 C60 0.001C55 0.01 SCK UNLK PLST SO DEVC293 0.1 R223 100 k C49 0.68R34 10 VCC1 1 IN1 2 ENB 3 CLK 4 DATA 5 T1 6 LOK 7 CP1 8 FI1 9 FO1 10 FO211 FI212 CP213 GND214 XO15 XI16 XB17 VCC218 IN219 GND120 IC1 PD3140GS C48 2.2R33 2.2 kR32 560 C54 0.001 C290 15 P C295 0.001 R35 680L11 MC152-E558CN-100024 C42 0.001 D28 MA77 Q32 DTC144EUC47 0.1 C229 0.001R249 47 k R208 10 kR209 100 kD5 HVC350B D13 HVC350B D6 MA2S077 R25 4.7 k R26 4.7 k C36 0.001 C37 2 P C38 2.5 P C41 30 P C44 0.001 C218 0.001 C235 0.1L12 2.7 µH R29 1 kQ7 2SC5085 Y Q8 2SC5085 Y S5 R5 5V R5 C27 18 P Q4 2SC4215 O R18 39 k C29 0.001 Q5 2SC4215 O C30 22 P C28 12 P C32 0.001R20 68 k Q6 2SC4215 O R22 68 k C33 0.001 R17 1 k C35 0.001C31 5 P C34 0.5 P L34 2.2 µH C62 9 P R105 470 [Narrow] 390 [Wide]R44 10 k [Narrow] 18 k [Wide] C225 0.0047 [Narrow] 0.0068 [Wide]R200 1 [Narrow] 47 k [Wide]R264 150 k [Narrow] 68 k [Wide] R88 33 k [Narrow] 39 k [Wide] R87 2.2 k [Narrow] 470 k [Wide]R86 47 k [Narrow] 100 k [Wide]C116 82 P [Narrow] 120 P [Wide]R82 3.9 k [Narrow] 2.2 k [Wide] R79 560 [Narrow] 1.2 k [Wide] C110 9 P [Narrow] 3.5 P [Wide]R262 1.8 k [Narrow] 1 [Wide] FL1 (31.05MHz) FL-311 [Narrow] FL-312 [Wide] FI2 SFPC450G [Narrow] SFPC450E [Wide] R199 1 [Narrow] 47 k [Wide]R114 33 k [Narrow] 22 k [Wide] C137 0.033 [Narrow] 0.027 [Wide] R10 82 C86 5 PC80 3 PC4 9 P C45 82 PL10 0.1 µHL9 0.1 µH C97 5 PC91 5 P C61 12 P L14 82 nH R41 100 L8 0.1 µH S5 D4 MA77D3 MA77C19 0.001 C20 0.001 C23 0.001 R11 1.2 kR12 3.3 k C24 0.001 C26 0.001R14 4.7 k R16 1R7 100 Q2 2SK2973 C17 0.001R255 56 C25 6 PC22 27 P C280 47 PR9 10 kC15 82 P C298 4.7 L6 39 nH L28 82 nH Q3 2SC5085 Y L7 0.1 µH C205 0.001 C288 0.001C204 0.001 L24 2.7 nH D1 MA77 C10 0.001 C14 0.001 Q1 2SK2974 C251 0.001 C21 4.7 C252 0.001 L4 50 nH C281 0.001 R5 22L5 10.5 nH L31 7.5 nH C18 0.001 C13 0.001C285 47 PR2 2.2 k R3 2.2 k R161 22 k R162 22 kC287 20 PC278 20 P C289 47 P D32 RB706-F40 D33 RB706-F40 L32 15 nH S5 C8 0.001 R1 82 k L1 32 nH C5 18 PC3 30 PC2 6 P C1 15 P L2 28 nH R210 3.9 k C179 0.01 Q37 DTA144EU R53 10 k R251 330 kR54 180 k C243 0.001R163 2.2 k 12 3 11 4 IC3A NJM2902V D9 HVU350 R58 100 k C81 100 PC78 10 PD8 MA77D2 MA77C52 22 PC73 0.1 R52 100 k L15 50 nH C75 0.1 T4 TXC W7 C76 8 P C79 5 P D29 MA8030 H L16 56 nHL22 50 nH R187 100 k R61 47 C90 0.001 C89 0.001 Q12 3SK293 R222 10 k C88 0.001C87 0.01R252 100 kD10 HVU350 R63 100 kC84 0.001C82 0.001 R57 100 k R62 100 k C138 0.001 R59 470R258 33 k C85 180 P C277 1.5 P [Narrow] 2 P [Wide]C83 1 P L17 56 nH L18 56 nH C99 0.001 R69 100 C104 0.001R72 10 kR70 100 kC102 15 P C101 56 PR68 4.7 k D12 HVU350D11 HVU350 R67 100 kR66 100 kR64 100 k C95 0.001C93 0.001R65 100 kC92 100 P Q13 3SK239A C96 180 PC94 1 P C100 39 PC98 5 P L19 56 nH L20 0.47 µH [Narrow] 0.50 µH [Wide] L21 47 nH L29 0.1 µH C111 0.01R77 100 R81 1.5 k R80 100 k C115 0.01R253 470C108 0.01C107 0.001C106 56 P [Narrow] 47 P [Wide] C105 0.01Q14 2SC4215 OR75 120 C109 0.001 F(DET)C118 0.01 R84 390R244 100 k X3 CDBCA450CX24 R85 1.5 k C120 0.1C119 1OSCIN 1 OSCOUT 2 MIXOUT 3 VCC 4 IFIN 5 DEC 6 FILOUT 7 FILIN 8 AFOUT9 QUAD10 IFOUT11 RSSI12 N-DET13 N-REC14 GND15 MIXIN16 IC2 TA31136FN(D)C117 0.001 R83 470 C113 0.001C112 0.001 R136 100C114 0.033 C303 0.001 C122 220 P C66 18 PC67 10 P C121 220 P Q10 2SC4116 GR R89 1.2 k R90 680 k C53 18 P C51 47 PC56 0.01 C65 2 P L13 1.0 µH L25 1.0 µH P10/TMOW VSS COM4 COM3 COM2 COM1 KS4 KS3 KS2 KS1 KS0 KR3 KR2 KR0 KR1 S1V3 V2 V1 VCC PA3/COM4 PA2/COM3 PA1/COM2 PA0/COM1 P50/WKP0/SEG1 P51/WKP1/SEG2 P52/WKP2/SEG3 P53/WKP3/SEG4 P54/WKP4/SEG5 P55/WKP5/SEG6 P56/WKP6/SEG7 P57/WKP7/SEG8 P60/SEG9 P61/SEG10 P62/SEG11 P63/SEG12 P64/SEG13 P65/SEG14 P66/SEG15 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50P81/AN1 P82/AN2 P83/AN3 P84/AN4 P85/AN5 P86/AN6 P87/AN7 AVREF VTREF TONED TONEM AVCC PE3/SEG52/CL1 PE2/SEG51/CL2 PE1/SEG50/DO PE0/SEG49/M PD7/SEG48 PD6/SEG47 PD5/SEG46 PD4/SEG45 PD3/SEG44 PD2/SEG43 PD1/SEG42 PD0/SEG41 VCCLVIN SD REMO PTT CTCIN CPU5 CPU5 CPU5 CPU5 DTMF MTONE SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 VIN GND VOUT CONT GND N. BYPASS COM4 1 COM3 2 COM2 3 COM1 4 SEG1 5 SEG2 6 SEG3 7 SEG4 8 SEG5 9 SEG6 10 SEG7 11 SEG8 12 SEG9 13 SEG10 14 SEG11 15 SEG12 16 SEG13 17 SEG14 18 SEG15 19 SEG16 20 SEG17 21 SEG18 22 SEG19 23 SEG20 24 SEG21 25 SEG22 26 COM1 27 COM2 28 COM3 29 COM4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 COM1 COM2 COM3 COM430DS1 LM-7045B CLIN CLOUT BDET MMUT R5C RMUT OPV1 OPV2 OPV3 GND OPT3 OPT2 OPT1 SIGOUT MOWN BUSY AUX MICIN MICOUT PTTOUT PTTIN SCK SI SO CIRQ CCS REM AFOUT DISCIN RXMUTE RMUTE BEEPOUT AFONOP MICMUTE MMUTE VCC 5V GND 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 16 to Optional unitJ5 17 18 19 20 21 22 23 24 25 26 27 28 29 30BUSY DUSEOI NOIS SD DET T4 T3 T2 T1 1LO DETS5C TONE MTONE DTMF FRQCOM CTCSSCTCIN ESDA ESCKDBAL DEV DET 5V CTCIN DAST SPEAKER SP1W5 OPC-963 1 2 PLSTPLST TX: 4.84 V RX: 0 V 4.92 VTX: 4.97 V RX: 0.03 V 4.96 V TX: 3.69 V RX: 5.01 V TX: 0.85 V RX: 5.01 VTX: 5.01 V RX: 0.86 V 4.44 V 5.01 V0.12 V 5.02 V TX: 5.0 V RX: 0.01 V 5.01 V TX: 0 V RX: 4.99 VTX: 0 V RX: 3.96 V 1.5 V (Light ON) 1.94 V 1.94 V VOLMIN – VOLMAX 7.23 V – 7.07 V3.31 V TX: 0 V RX: 3.47 V TX: 0 V RX: 3.64 V TX: 0.85 V RX: 0.47 V TX: 0.97 V RX: 1.03 V TX: 1.92 V RX: 1.98 VTX: 0 V RX: 3.24 VTX: 5.03 V RX: 0.05V 4.72 V 3.57 V3.58 V3.59 V3.37 V TX: 0.7 V RX: 0.73 V TX: 0.8 V RX: 0 VTX: 2.16 V RX: 0.53 V TX: 2.17 V RX: 0.53 VTX: 1.69 V RX: 0.03 V TX: 4.62 V RX: 0.04 V 4.03 V 1.44 V TX: 0 V RX: 2.3 V TX: 1.39 V RX: 2.47 V TX: 0 V RX: 0.53 V TX: 0 V RX: 4.58 V TX: 0 V RX: 4.62 VTX: 0 V RX: 3.96 V TX: 0 V RX: 5.01 V 5.06 V 0 V0 V TX: 0 V RX: 4.76 V TX: 0 V RX: 3.57 V TX: 0 V RX: 4.76 V TX: 0 V RX: 4.76 V TX: 0.83 V RX: 0.01 V TX: 1.68 V RX: 5.03 VTX: 1.61 V RX: 0.67 V TX: 0 V RX: 2.43 V TX: 1.67 V RX: 3.73 V 0 V3.8 V 0.4 V 1.2 V0.4 V 1.5 V DTCSCTCSS DTCS4.8 V 4.4 V 1.4 V 1.0 V CTCSS 4.5 V 1.2 V DTMF 3.8 V 0.8 V LEFT SIDERIGHT SIDECENTER SECTION 11 VOLTAGE DIAGRAM 11 - 1
6-9-16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan Phone : 06 6793 5302 Fax : 06 6793 0013 Communication Equipment Himmelgeister Str. 100, D-40225 Düsseldorf, Germany Phone : 0211 346047 Fax : 0211 333639 URL : http://www.icomeurope.comUnit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K. Phone : 01227 741741 Fax : 01227 741742 URL : http://www.icomuk.co.ukZac 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.comCrta. 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 2380 116th Avenue N.E., Bellevue, WA 98004, U.S.A. Phone : ( 425) 454-8155 Fax : ( 425) 454-1509 URL : http://www.icomamerica.com Phone : ( 425) 454-7619A.C.N. 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 6F No. 68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C. Phone : (02) 2559 1899 Fax : (02) 2559 18743071 #5 Road, Unit 9, Richmond, B.C., V6X 2T4, Canada Phone : ( 604) 273-7400 Fax : ( 604) 273-1900 URL : http://www.icomcanada.com INTRODUCTION DANGER ORDERING PARTS REPAIR NOTES This service manual describes the latest service information for the IC-F3GT and IC-F3GS at the time of publication. NEVERconnect the transceiver to an AC outlet or to a DC power supply that uses more than 16 V. Such a connection could cause a fire hazard and/or electric shock. DO NOTexpose the transceiver to rain, snow or any liquids. DO NOTreverse the polarities of the power supply when con- necting the transceiver.DO NOTapply an RF signal of more than 20 dBm (100mW)to the antenna connector. This could damage the transceiv- er’s front end. 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 0910051872 PCB B-5386B IC-F3GT MAIN UNIT 1 pieces 8810009510 Screw BT M2 x 6 ZK IC-F3GS Chassis 10 piecesAddresses are provided on the inside back cover for your convenience. 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 insulated turning tool MUSTbe used for all adjustments. 5.DO NOTkeep power ON for a long time when the transceiver is defective. 6.DO NOTtransmit power into a signal generator or a sweep generator. 7.ALWAYSconnect a 40 dB to 50 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment. 8.READthe instructions of test equipment thoroughly before connecting equipment to the transceiver. To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or oblig- ation. IC-F3GTIC-F3GS
SERVICE MANUAL 6-9-16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan S-13605II-CD © 1999 Icom Inc. VHF FM TRANSCEIVERS