Icom IC-F21, IC-F21S service manual

Contents

Main INTRODUCTION IC-F21 IC-F21S DANGER ORDERING PARTS REPAIR NOTES TABLE OF CONTENTS SECTION 1 SPECIFICATIONS GENERAL TRANSMITTER RECEIVER SECTION 2 INSIDE VIEWS MAIN UNIT () TOP VIEW BOTTOM VIEW SECTION 3 DISASSEMBLY INSTRUCTIONS REMOVING THE CHASSIS REMOVING THE MAIN UNIT 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 AF CIRCUIT 4-2-1 MICROPHONE AMPLIFIER CIRCUIT 4-2-2 MODULATION CIRCUIT 4-2-3 DRIVE/POWER AMPLIFIER CIRCUITS 4-3 PLL CIRCUIT 4-3-1 GENERAL PLL CIRCUIT 4-3-2 TX LOOP 4-3-3 RX LOOP 4-4 POWER SUPPLYCIRCUITS VOLTAGE LINE 4-5 PORT ALLOCATIONS 4-5-1 CPU (IC7) 4-5-3 D/A CONVERTOR IC (IC9) CPU (IC7)continued 4-5-2 OUTPUT EXPANDER IC (IC15) 5-1 PREPARATION REQUIRED TEST EQUIPMENT SECTION 5 ADJUSTMENT PROCEDURES SYSTEM REQUIREMENTS ADJUSTMENT SOFTWARE INSTALLATION STARTING SOFTWARE ADJUSTMENT NOTE: CAUTION: NOTE: C54 TOP VIEW C68 5-2 PLL ADJUSTMENT 5-3 SOFTWARE ADJUSTMENT SOFTWARE ADJUSTMENT continued CONVENIENT: 6 - 1 [SW-AUNIT] ([F21] only) SECTION 6 PARTS LIST [SW-B UNIT] ([F21S] only) 6 - 2 6 - 3 6 - 4 6 - 5 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 - 1 [CHASSIS PARTS] MP1 [ACCESSORIES] IC-F21S SECTION 8 SEMI-CONDUCTOR INFORMATION 8 - 1 SECTION 9 BOARD LAYOUTS J4 SP 2GND 9 - 1 9-1 MAIN UNIT FT1 Q15 Q32 IC11 Q9 B5603C R2 R3 R2 R1S1 S1 W1 R3 W2 R1 B5604C SECTION 10 10 - 1 BC-146 OPTIONAL DESKTOP CHARGER INFORMATION [CHASSIS UNIT] 10-1 PARTS LIST 10-2 DISASSEMBLYINFORMATION Page 11 - 1 SECTION 11 BLOCK DIAGRAM EXT.SP PTT SW-A/SW-B UNIT INT.SP SECTION 12 VOLTAGE DIAGRAM 12-1 MAIN UNIT 12 - 1 EP3 8 5 Y Q28 DTC144EV DTC144EU Q5 SECTION 12 VOLTAGE DIAGRAM 12-1 MAIN UNIT 12 - 1 12 - 2 12-2 SW-A AND SW-B UNITS CHASSIS UNIT 2CH VERSION INTRODUCTION IC-F21 IC-F21S DANGER ORDERING PARTS REPAIR NOTES