Icom IC-78

TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTIONS
SECTION 4 CIRCUIT DESCRIPTION
4 – 1 RECEIVER CIRCUITS ................................................................................................................. 4 – 1
4 – 2 TRANSMITTER CIRCUITS .......................................................................................................... 4 – 4
4 – 3 PLL CIRCUIT ................................................................................................................................ 4 – 6
4 – 4 LOGIC CIRCUITS ........................................................................................................................ 4 – 6
4 – 5 POWER SUPPLY CIRCUITS ....................................................................................................... 4 – 8
SECTION 5 ADJUSTMENT PROCEDURES
5 – 1 PREPARATION BEFORE SERVICING......................................................................................... 5 – 1
5 – 2 PLL ADJUSTMENT ....................................................................................................................... 5 – 2
5 – 3 TRANSMITTER ADJUSTMENTS.................................................................................................. 5 – 4
5 – 4 RECEIVER ADJUSTMENTS......................................................................................................... 5 – 8
5 – 5 SET MODE ADJUSTMENT........................................................................................................... 5 – 10
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATIONS
SECTION 9 BOARD LAYOUTS
9 – 1 MAIN UNIT ................................................................................................................................... 9 – 1
9 – 2 PA UNIT......................................................................................................................................... 9 – 3
9 – 3 PLL UNIT ...................................................................................................................................... 9 – 3
9 – 4 LOGIC UNIT ................................................................................................................................. 9 – 5
9 – 5 PHONE BOARD ............................................................................................................................ 9 – 5
9 – 6 MIC BOARD .................................................................................................................................. 9 – 5
9 – 7 VR BOARD.................................................................................................................................... 9 – 5
9 – 8 SENSOR BOARD.......................................................................................................................... 9 – 6
9 – 9 FILTER UNIT ................................................................................................................................. 9 – 7
SECTION 10 BLOCK DIAGRAM
SECTION 11 WIRING DIAGRAM
SECTION 12 VOLTAGE DIAGRAMS