Icom IC-706 Service Manual

TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 CIRCUIT DESCRIPTION
3 - 1 RECEIVER CIRCUITS 3 - 1
3 - 2 TRANSMITTER CIRCUITS 3 - 4
3-3 PLLCIRCUITS 3-6
3 - 4 LOGIC CiRCUiTS 3 - 8
SECTION 4 ADJUSTMENT PROCEDURES
4 - 1 PREPARATION BEFORE SERVICING 4 - 1
4 - 2 PLL ADJUSTMENT ;~ 4 - 2
4
- 3 RECEIVER ADJUSTMENT 4 - 2
4
- 4 TRANSMITTER ADJUSTMENT , 4 - 4
4
- 5 METER ADJUSTMENT 4 - 9
SECTION 5 PARTS LIST
5 - 1 IC-706 5 - 1
5-2 AT-180 5-19
SECTION 6 MECHANICAL PARTS AND DISASSEMBLY
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8
BOARD LAYOUTS
8 - 1 DISPLAY UNIT 8 - 1
8-2 MAIN UNIT 8-3
8 - 3 PLL UNIT 8 - 5
8 - 4 PA UNIT 8 - 6
8 - 5 FILTER UNIT 8 - 7
SECTION 9 OPTIONAL UNITS
9 -1 UT-102 VOICE SYNTHESIZER UNIT 9-1
9 - 2 AT-180 HF/50 MHz AUTOMATIC ANTENNA TUNER 9 - 1
SECTION 10 BLOCK DIAGRAM
SECTION
11 VOLTAGE DIAGRAM

Icom IC-706 Specifications

General

Antenna Impedance	50 ohms
Supply Voltage	13.8 V DC ±15%
Modes	SSB, CW, AM, FM
Current Drain Transmit	20 A (max)
Sensitivity SSB/CW	0.16 μV (10 dB S/N)
Sensitivity AM	2.0 μV (10 dB S/N)
Selectivity SSB	2.2 kHz/-6 dB, 4.5 kHz/-60 dB
Selectivity CW	500 Hz/-6 dB
Selectivity AM	6 kHz/-6 dB
Selectivity FM	30 kHz/-60 dB