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SERVICE

MANUAL

UHF TRANSCEIVERS

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Summary of Contents for IC-F24

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

Page 2: ...ransceiver until the transceiver is disconnected from its power source 3 DO NOT force any of the variable components Turn them slowly and smoothly 4 DO NOT short any circuits or electronic parts An in...

Page 3: ...5 POWER SUPPLY CIRCUITS 4 5 4 6 PORT ALLOCATIONS 4 5 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION 5 1 5 2 CONFIGURATION LISTS FOR ADJUSTMENTS 5 2 5 3 SOFTWARE ADJUSTMENTS 5 3 SECTION 6 PARTS LIST...

Page 4: ...r Middle 40 dB min 50 dB typical for Narrow Limiting charact of modulator 60 100 of maximum deviation Microphone impedance 2 2 k RECEIVER Receive system Double conversion superheterodyne system Interm...

Page 5: ...C13 HD6433687A91FP S5 Regulator Q23 2SB1132 Q24 XP6501 Q25 UNR9113J Crystal filter FI1 FL 335 FM IF IC IC1 TA31136FN IF amplifier Q4 2SC4215 EEPROM IC15 BR24L16FV Power amplifier Q7 RD07MVS1 T5 Regula...

Page 6: ...the earth plate 3 Unsolder 5 points I and remove the shield cover 4 Unscrew 2 screws K and remove the side plate L 5 Unscrew 7 screws M 6 Unsolder 4 points N and take off the main unit in the directi...

Page 7: ...t the 1st mixer cir cuit Q3 to produce a 46 35 MHz 1st IF signal The 1st IF signal is passed through a monolithic filter FI1 in order to obtain selection capability and to pass only the desired sig na...

Page 8: ...one squelch circuit detects tone signals and opens the squelch only when the receiving signal contains matched subaudible tone CTCSS or DTCS When tone squelch is in use and a signal with a mismatched...

Page 9: ...e drive Q5 drive Q8 and power Q7 amplifiers to obtain 4 W max of RF power at 7 2 V DC The amplified signal passes through the low pass filter L4 C11 C13 C16 antenna switch D2 the low pass filter L1 L3...

Page 10: ...he loop filter C130 C138 C146 C147 R95 R97 the DC voltage is applied to the TX RX VCO as the lock voltage If the oscillated signal drifts its phase changes from that of the reference frequency causing...

Page 11: ...to the LED driver Q32 pins 2 and 5 The driver outputs LED control signals to the LEDs DS1 4 6 PORT ALLOCATION 4 6 1 D A CONVERTER IC IC8 CONDITION COLOR RECEIVING 2 5 TONE CODE ORANGE Lighting LOW BA...

Page 12: ...gnals to the D A convertor IC8 pin 6 Input port for the connecting battery type detect signal 38 S5C Outputs power save control signal 39 T5C Outputs T5 regurator control signal Low While transmitting...

Page 13: ...quency range DC 600 MHz Measuring range 0 to 10 kHz Frequency range 0 1 600 MHz Frequency accuracy 1 ppm or better Sensitivity 100 mV or better Input impedance 10 M V DC or better Measuring range 1 10...

Page 14: ...BALANCE CH FREQUENCY MHz SETTING CONDITION US2 EU2 GE2 US3 GE3 1 435 000 485 000 Set TX power to Low1 Set IF bandwidth to Wide Set CTCSS to 151 4Hz 6 CTCSS DTCS DEVIATION CH FREQUENCY MHz SETTING COND...

Page 15: ...C millivoltmeter to the antenna connector Attenuator 20 dB 30 dB RF power meter 0 1 10 W 50 Frequency counter Standard signal generator 0 1 V to 32 mV 127 dBm to 17 dBm DO NOT transmit while an SSG is...

Page 16: ...5 4 PC SCREEN EXAMPLE NOTE The above screen is an example Each transceiver has its own specific values for each setting...

Page 17: ...counter to the antenna connector 470 0000 MHz US2 EU2 GE2 520 0000 MHz US3 GE3 OUTPUT POWER Power Hi 1 Operating CH CH1 CH1 Transmitting Top panel Connect the RF power meter to the antenna connector...

Page 18: ...r and set as Frequency 400 000 MHz US2 EU2 GE2 450 000 MHz US3 GE3 Level 20 dB 87dBm Modulation 1 kHz Deviation 3 5 kHz Receiving Side Panel Connect the SINAD meter with an 8 load to the SP jack throu...

Page 19: ...50 MHz B 62 8 27 7 FI2 2020001840 CER ALFYM450F K FI3 2040001440 S LC NFE31PT152Z1E9L B 81 2 17 8 X1 6070000190 S DCR CDBCB450KCAY24 R0 T 54 4 20 X2 6050011940 S XTL CR 783 15 3 MHz T 36 9 28 9 X3 605...

Page 20: ...T 37 2 40 1 R123 7030008400 S RES ERJ2GEJ 182 X 1 8 k T 75 2 37 7 R124 7030005170 S RES ERJ2GEJ 474 X 470 k T 72 7 40 4 R125 7030005110 S RES ERJ2GEJ 224 X 220 k T 73 2 38 9 R131 7510001730 S TMR ERTJ...

Page 21: ...C27 4030017460 S CER ECJ0EB1E102K T 83 9 35 7 C28 4030017460 S CER ECJ0EB1E102K T 83 9 37 7 C30 4030017590 S CER ECJ0EC1H070C B 79 6 37 8 C31 4030017460 S CER ECJ0EB1E102K T 80 4 37 2 C32 4030017460...

Page 22: ...H070C B 54 2 42 3 C209 4030017460 S CER ECJ0EB1E102K B 54 2 43 3 C211 4030018910 S CER C1608 JB 0J 475K T T 36 1 21 9 C213 4030017460 S CER ECJ0EB1E102K T 31 5 27 8 C221 4030016930 S CER ECJ0EB1A104K...

Page 23: ...S CNR BM02B ASRS TF T 86 6 6 8 J2 6450001680 CNR HSJ1122 010010 J3 6450002250 CNR HSJ1456 010320 J4 6510018430 S CNR AXN330C038P B 11 8 30 6 J5 6510021900 S CNR BM02B ASRS TF T 50 4 11 7 US2S US3S EU...

Page 24: ...963 1 W2 8900009640 OPC 963 F24S F25S only 1 J1 6910015910 Antenna connector 104 1 J2 6910015860 IMSA 6277S 02A G 1 MP1 8010019690 2775 chassis 1 MP2 8210020920 2775 front panel 1 MP8 8210020550 2721...

Page 25: ...ANT Unit MP1 C J1 C MP36 C MP35 C MP17 C MP8 C MP31 C MP13 C MP14 C MP27 C MP26 C MP26 C J2 C J3 M J2 M MC1 M S1 M W1 C MP32 C MP2 C S1 C W2 C W2 C IC F24 F25 only MP4 M MP37 C MP17 C IC F24S F25S IC...

Page 26: ...l K2 RD07MVS1 Symbol RD07MVS1 G S S D G S D UNR9113J Symbol 6C B E C UNR9213J Symbol 8C UNR9210J Symbol 8L B E C B E C B E C XP1214 Symbol 9H B1 E1 B2 C1 C2 XP6501 AB Symbol 5N E1 E2 B2 C1 B1 C2 XP421...

Page 27: ...C96 C92 C107 C43 R23 C21 R125 R12 L22 C102 R24 C34 C33 R19 C31 C35 C173 R11 D30 R297 R52 R302 C171 C74 C170 C27 R14 C28 R13 R61 R123 C50 C42 R67 R124 R68 R66 R65 C182 R9 C80 R7 C72 R134 C231 C232 C23...

Page 28: ...R107 C209 R101 C143 C141 R89 R96 C130 R97 R113 C300 R183 C288 C160 R284 R234 R252 R179 R187 C339 C346 R254 R255 C344 C341 R251 C345 C340 R292 R291 R235 C321 C342 C343 R236 C289 C203 C144 C138 R114 C1...

Page 29: ...RE DRIVE DRIVE AMP PWR AMP LPF 353 65 MHz 473 65 MHz Q3 3SK299 46 35 MHz MIXER XTAL BPF IF AMP FI1 FL 335 Q4 2SC4215 DET LPF LPF LPF FIL SW CSFT EEPROM X3 CR 764 19 6608 MHz SHIFT SW CH SELECT AMP IC7...

Page 30: ...I0D1 P85 P86 P87 P20 SCK3 P21 RXD P22 TXD P23 NMI 33 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 TEMP ESCL ESDA R265 1 k 17 PLST PLED NWC 34 42 TLED 43 OPT3 44 OPT1 45 OPT2 46 PTT 47 DAST 37 S5C 38 T5C 39...

Page 31: ...a Inc 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 Icom Canada A B N 88 006 092 575 290 2...

Page 32: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14116IZ C1 2004 Icom Inc...

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