Icom IC-F3GS service manual

SERVICE

MANUAL

6-9-16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan S-13605II-CD

VHF FM TRANSCEIVERS

Contents

Main INTRODUCTION IC-F3GT IC-F3GS DANGER ORDERING PARTS REPAIR NOTES TABLE OF CONTENTS SECTION 1 SPECIFICATIONS GENERAL TRANSMITTER RECEIVER SECTION 2 INSIDE VIEWS () () SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS 3-1 DISASSEMBLYINSTRUCTION REMOVING THE CHASSIS PANEL REMOVING THE MAIN UNIT 3-2 OPTIONAL UNIT INSTALLATIONS SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT 4-1-2 RF CIRCUIT 4-1-3 1ST MIXER AND 1ST IF CIRCUITS 4-2 TRANSMITTER CIRCUITS 4-2-1 MICROPHONE AMPLIFIER CIRCUIT 4-2-2 MODULATION CIRCUIT 4-2-3 DRIVE/POWER AMPLIFIER CIRCUITS 4-2-5 APC CIRCUIT 4-3 PLL CIRCUIT 4-4 POWER SUPPLYCIRCUITS VOLTAGE LINE PLL circuit 4-5 PORT ALLOCATIONS CPU (IC8)continued 4-5-1 CPU (IC8) 4-5-2 OUTPUT EXPANDER IC (IC10) 5-1 PREPARATION SECTION 5 ADJUSTMENT PROCEDURES SYSTEM REQUIREMENTS ADJUSTMENT SOFTWARE INSTALLATION STARTING SOFTWARE ADJUSTMENT NOTE: CAUTION: Top view 5-2 PLL ADJUSTMENT L11 LV MAIN unit Bottom view 5-3 SOFTWARE ADJUSTMENT SOFTWARE ADJUSTMENT continued CONVENIENT: SECTION 6 PARTS LIST 6 - 1 6 - 2 6 - 3 6 - 4 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 - 1 [CHASSIS PARTS] MP1 MP2 [ACCESSORIES] IC-F3GS parts SECTION 8 SEMI-CONDUCTOR INFORMATION 8 - 1 SECTION 9 BOARD LAYOUTS 9 - 1 MAIN UNIT D11 D8 R143 MP5 J3 J2 S1 S3 Q21 Q22 SECTION 10 BlLOCK DIAGRAM OPTION UNIT CPU LCD KEY MATRIX Q17 UN911H SECTION 11 VOLTAGE DIAGRAM 11 - 1 IC5 TA7368F HD6473877H PD 3 Q10 Q11 Q34 2SK1069 4 PD3140GS Q32 Q7 LEFT SIDE RIGHT SIDECENTER SECTION 11 VOLTAGE DIAGRAM 11 - 1 INTRODUCTION IC-F3GT IC-F3GS DANGER ORDERING PARTS REPAIR NOTES