Manuals / Icom / Communications / Two-Way Radio

Icom IC-F21S service manual Sw-A And Sw-B Units, B5603C, Top View Sw-A Unit

Models: IC-F21S

1 38

Download 38 pages 4.38 Kb

Page 28

Image 28

9-2 SW-A AND SW-B UNITS

•TOP VIEW SW-A UNIT

F1	DS1
Q1

SW-B UNIT

B5603C

DS1

9 - 3

Page 28

Image 28

Icom IC-F21S service manual Sw-A And Sw-B Units, B5603C, Top View Sw-A Unit

Contents

UHF FM TRANSCEIVERS SERVICE MANUALINTRODUCTION DANGERORDERING PARTS REPAIR NOTESTABLE OF CONTENTS SECTION 1 SPECIFICATIONS ‘ GENERAL‘ TRANSMITTER ‘ RECEIVERMAIN UNIT TOP VIEW SECTION 2 INSIDE VIEWSBOTTOM VIEW REMOVING THE CHASSIS SECTION 3 DISASSEMBLY INSTRUCTIONSREMOVING THE MAIN UNIT SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS4-1-1 ANTENNA SWITCHING CIRCUIT 4-1-4 2ND IF AND DEMODULATOR CIRCUITS4-2 TRANSMITTER CIRCUITS 4-2-3 DRIVE/POWER AMPLIFIER CIRCUITS4-1-6 SQUELCH CIRCUIT 4-2-1 MICROPHONE AMPLIFIER CIRCUIT4-3 PLL CIRCUIT 4-3-1 GENERAL4-3-2 TX LOOP 4-3-3 RX LOOP4-5 PORT ALLOCATIONS 4-4 POWER SUPPLY CIRCUITS VOLTAGE LINE4-5-1 CPU IC7 LINECPU IC7-continued 4-5-2 OUTPUT EXPANDER IC IC154-5-3 D/A CONVERTOR IC IC9 PortSECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATIONSTARTING SOFTWARE ADJUSTMENT ADJUSTMENT SOFTWARE INSTALLATIONRF Power High Screen display exampeJIG cable CH NoConnection DC power cable connectionsOPC-478 5-2 PLL ADJUSTMENT ADJUSTMENTADJUSTMENT CONDITIONS ADJUSTMENT5-3 SOFTWARE ADJUSTMENT ADJUSTMENTADJUSTMENT CONDITION MEASUREMENTSOFTWARE ADJUSTMENT - continued ADJUSTMENTADJUSTMENT CONDITION MEASUREMENTPARTS LIST SECTIONSW-A UNIT F21 only UNIT F21S onlyMAIN UNIT MAIN UNITORDER DESCRIPTIONMAIN UNIT MAIN UNITORDER DESCRIPTIONMAIN UNIT MAIN UNITORDER DESCRIPTIONORDER MAIN UNITDESCRIPTION SECTION 7 MECHANICAL PARTS AND DISASSEMBLY ACCESSORIESCHASSIS PARTS MAIN UNITIC-F21S UNIT abbreviation C CHASSIS PARTS, M MAIN UNITTRANSISTOR AND FET’S SECTION 8 SEMI-CONDUCTOR INFORMATIONDIODES SECTION 9 BOARD LAYOUTS 9-1 MAIN UNITB5601C TOP VIEWBOTTOM VIEW IC119-2 SW-A AND SW-B UNITS B5603CTOP VIEW SW-A UNIT SW-B UNITB5604C BOTTOM VIEW SW-A UNITto the MAIN unit J1 SW-B UNIT10-1 PARTS LIST 10-2 DISASSEMBLY INFORMATIONSECTION 10 BC-146 OPTIONAL DESKTOP CHARGER INFORMATION CHARGE UNIT10-3 VOLTAGE DIAGRAM MP1 MP2B5650 10-4 BOARD LAYOUTSECTION 11 BLOCK DIAGRAM MAIN UNITSW-A/SW-B UNIT S1 EXT.MICSECTION 12 VOLTAGE DIAGRAM 12-1 MAIN UNITSDEC SECTION VOLTAGE DIAGRAM12-1 MAIN UNIT CHASSIS UNIT 12-2 SW-A AND SW-B UNITSSW-A UNIT SW-B UNITPage S-13717IZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan2001 Icom Inc