Manuals / Icom / Communications / Two-Way Radio

Icom IC-F21S service manual Inside Views, Main Unit Top View, Bottom View

Models: IC-F21S

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SECTION 2 INSIDE VIEWS

• MAIN UNIT

TOP VIEW

Power amplifier (Q1: 2SK2974)

Pre-drive (Q2 : 2SK2973)

YGR amplifier (Q3:Q4: 2SC35852SC5107 )

TX/RX switch (D3, D4: MA77)

VCO circuit

PLL reference oscillator (X1: CR-671A 15.3 MHz)

Low-pass filter circuit (IC12,16: NJM12904V)

Expander IC

(IC15: BU4094BCFV)

BOTTOM VIEW

Antenna switching circuit (D1:D9, 1SV307D10: MA77)

RF amplifier (Q15: 3SK293)

APC

(IC2: TA75S01F)

AF amplifier (IC4: TA7368F)

Analog switch

(IC6: BU4066BCFV)

D/A converter (IC9: M62363FP)

Crystal filter (FI1: FL-313)

FM IF IC

(IC3: TA31136FN)

1st mixer (Q19: 3SK272)

PLL IC

(IC1: MB15A02PFV1)

CPU

(IC7: HD6433664A24FP)

EEPROM

(IC11: HN58X2416TI)

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Icom IC-F21S service manual Inside Views, Main Unit Top View, Bottom View

Contents

SERVICE MANUAL UHF FM TRANSCEIVERSDANGER INTRODUCTIONORDERING PARTS REPAIR NOTESTABLE OF CONTENTS ‘ GENERAL SECTION 1 SPECIFICATIONS‘ TRANSMITTER ‘ RECEIVERBOTTOM VIEW SECTION 2 INSIDE VIEWSMAIN UNIT TOP VIEW REMOVING THE MAIN UNIT SECTION 3 DISASSEMBLY INSTRUCTIONSREMOVING THE CHASSIS 4-1 RECEIVER CIRCUITS SECTION 4 CIRCUIT DESCRIPTION4-1-1 ANTENNA SWITCHING CIRCUIT 4-1-4 2ND IF AND DEMODULATOR CIRCUITS4-2-3 DRIVE/POWER AMPLIFIER CIRCUITS 4-2 TRANSMITTER CIRCUITS4-1-6 SQUELCH CIRCUIT 4-2-1 MICROPHONE AMPLIFIER CIRCUIT4-3-1 GENERAL 4-3 PLL CIRCUIT4-3-2 TX LOOP 4-3-3 RX LOOP4-4 POWER SUPPLY CIRCUITS VOLTAGE LINE 4-5 PORT ALLOCATIONS4-5-1 CPU IC7 LINE4-5-2 OUTPUT EXPANDER IC IC15 CPU IC7-continued4-5-3 D/A CONVERTOR IC IC9 Port5-1 PREPARATION SECTION 5 ADJUSTMENT PROCEDURESSTARTING SOFTWARE ADJUSTMENT ADJUSTMENT SOFTWARE INSTALLATIONScreen display exampe RF Power HighJIG cable CH NoOPC-478 DC power cable connectionsConnection ADJUSTMENT 5-2 PLL ADJUSTMENTADJUSTMENT CONDITIONS ADJUSTMENTADJUSTMENT 5-3 SOFTWARE ADJUSTMENTADJUSTMENT CONDITION MEASUREMENTADJUSTMENT SOFTWARE ADJUSTMENT - continuedADJUSTMENT CONDITION MEASUREMENTSECTION PARTS LISTSW-A UNIT F21 only UNIT F21S onlyMAIN UNIT MAIN UNITORDER DESCRIPTIONMAIN UNIT MAIN UNITORDER DESCRIPTIONMAIN UNIT MAIN UNITORDER DESCRIPTIONDESCRIPTION MAIN UNITORDER ACCESSORIES SECTION 7 MECHANICAL PARTS AND DISASSEMBLYCHASSIS PARTS MAIN UNITUNIT abbreviation C CHASSIS PARTS, M MAIN UNIT IC-F21SDIODES SECTION 8 SEMI-CONDUCTOR INFORMATIONTRANSISTOR AND FET’S 9-1 MAIN UNIT SECTION 9 BOARD LAYOUTSB5601C TOP VIEWIC11 BOTTOM VIEWB5603C 9-2 SW-A AND SW-B UNITSTOP VIEW SW-A UNIT SW-B UNITBOTTOM VIEW SW-A UNIT B5604Cto the MAIN unit J1 SW-B UNIT10-2 DISASSEMBLY INFORMATION 10-1 PARTS LISTSECTION 10 BC-146 OPTIONAL DESKTOP CHARGER INFORMATION CHARGE UNITMP1 MP2 10-3 VOLTAGE DIAGRAMB5650 10-4 BOARD LAYOUTMAIN UNIT SECTION 11 BLOCK DIAGRAMSW-A/SW-B UNIT S1 EXT.MIC12-1 MAIN UNIT SECTION 12 VOLTAGE DIAGRAMSDEC 12-1 MAIN UNIT VOLTAGE DIAGRAMSECTION 12-2 SW-A AND SW-B UNITS CHASSIS UNITSW-A UNIT SW-B UNITPage 2001 Icom Inc 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, JapanS-13717IZ-C1