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Icom IC 718 service manual.pdf


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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 – 5

4–4

LOGIC CIRCUITS .......................................................................................................................... 4 – 6

4–5

REGULATOR CIRCUITS ................................................................................................................ 4 – 6

SECTION 5

ADJUSTMENT PROCEDURES

5–1

PREPARATION BEFORE SEVICING ............................................................................................. 5 – 1

5–2

PLL ADJUSTMENTS....................................................................................................................... 5 – 2

5–3

TRANSMITTER ADJUSTMENTS ................................................................................................... 5 – 4

5–4

RECEIVER ADJUSTMENTS .......................................................................................................... 5 – 8

5–5

SET MODE ADJUSTMENT ............................................................................................................ 5 – 6

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

PLL UNIT ........................................................................................................................................ 9 – 2

9–3

LOGIC UNIT ................................................................................................................................... 9 – 3

9–4

PHONE BOARD.............................................................................................................................. 9 – 3

9–5

MIC BOARD.................................................................................................................................... 9 – 3

9–6

VR BOARD ..................................................................................................................................... 9 – 3

9–7

FILTER UNIT................................................................................................................................... 9 – 5

9–8

PA UNIT .......................................................................................................................................... 9 – 7

SECTION 10

BLOCK DIAGRAM

SECTION 11

WIRING DIAGRAM

SECTION 12

VOLTAGE DIAGRAMS