Icom IC-4008MKII service manual

SERVICE

MANUAL

UHF FM TRANSCEIVER

LPD FM TRANSCEIVER

Contents

Main INTRODUCTION DANGER ORDERING PARTS REPAIR NOTES TABLE OF CONTENTS SECTION 1 SPECIFICATIONS [ITA], [ITA-1] [CSA], [CSA-1] RECEIVER TRANSMITTER GENERAL CHANNEL FREQUENCY LIST CTCSS FREQUENCY LIST SECTION 2 INSIDE VIEWS TOP VIEW BOTTOM VIEW TOP VEIW BOTTOM VEIW SECTION 3 DISASEMBLY INSTRUCTIONS SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNASWITCHING CIRCUIT (RF UNIT) 4-1-2 RF CIRCUIT (RF UNIT) 4-1-3 1st MIXER AND 1st IF CIRCUITS (RF UNIT) 4-2 TRANSMITTER CIRCUITS 4-2-1 MICROPHONE AMPLIFIER CIRCUIT (MAIN UNIT) 4-2-2 MODULATION CIRCUIT (RF UNIT) 4-2-3 DRIVE/POWER AMPLIFIER CIRCUITS (RF UNIT) 4-3 PLL CIRCUITS (RF UNIT) 4-4 POWER SUPPLYCIRCUITS VOLTAGE LINE 4-5-1 CPU (MAIN unit; IC1) 4-5 PORT ALLOCATIONS SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION CONNECTIONS REQUIRED TEST EQUIPMENT ENTERING THE ADJUSTMENT MODE 5-2 ADJUSTMENT Page SECTION 6 PARTS LIST [MAIN UNIT] [MAIN UNIT] 6 - 1 [RF BOARD] 6 - 2 [RF UNIT] [RF UNIT] 6 - 3 [RF UNIT] SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 - 1 MP1 MP2 7-1 CABINET PARTS [CHASSIS PARTS] UNIT abbreviation (C): CHASSIS PARTS, (RF): RF UNIT, (M): MAIN UNIT 7 - 2 SECTION 8 SEMI-CONDUCTOR INFORMATION DIODES 8 - 1 TRANSISTOR AND FETS AK SECTION 9 BOARD LAYOUTS 9-1 MAIN UNIT DS2 9 - 1 MC1 DS2 MC1 9 - 4 to RF unit J2 R58 J4 R54 Q44 IC3 SECTION 10 BLOCK DIAGRAM CPU 10 - 1 COMON LINE TX LINE RX LINE DATA BUS LINE RF UNIT SECTION 11 VOLTAGE DIAGRAM 11 - 1 11-1 MAIN UNIT IC3 X24C01AS Q14 DTA114EU 11-2 RF UNIT 11 - 2 IC2 TA31136FN 2SC4215 Q15 6-9-16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan Phone : 06 6793 5302 Fax : 06 6793 0013 < > < >