Icom IC-725 Amateur HF Transceiver Manuals

Manuals and User Guides for Icom IC-725 Amateur HF Transceiver. We have 9 Icom IC-725 Amateur HF Transceiver manuals available for free PDF download: Service Manual, Instruction Manual

Icom IC-725 Service Manual (67 pages)

Brand: Icom | Category: Transceiver | Size: 12 MB

Danger
2
Ordering Parts
2
Repair Note
2
Table of Contents
3
Specifications
4
Inside Views
5
PLL Unit View
5
Main Unit View
5
PA and Filter Units View
6
Block Diagram
7
Circuit Description
8
Receiver Circuits
8
RF Switching Circuit (PA and Main Units)
8
1St Mixter Circuits (Main Unit)
8
IF Circuits (Main Unit)
9
Noise Blanker Circuits (Main Unit)
9
BFO Circuit (Main Unit)
9
Demodulator Circuits (Main Unit)
10
AF Input Mode Selector Switch (Main Unit)
10
AF Amp Circuit (Main Unit)
10
AGC and S-Meter Circuit (Main Unit)
10
Transmitter Circuits
11
MIC Amplifier (Main Unit)
11
Balanced Modulator (Main Unit)
11
Squelch Circuit (Main Unit)
11
RF Filter Circuit (PA Unit)
12
ALC Circuit (Main Unit)
12
APC Circuits (Main Unit)
12
CW Keying Circuit (Main Unit)
12
PLL Circuits
13
Reference Oscillator Circuit (PLL Unit)
13
Main Loop (PLL Unit)
13
Sub Loop (PLL Unit)
13
Logic Circuits
14
Band Selection Data (PLL Unit)
14
PLL Circuit Block Diagram
14
Regulator Circuits
15
RIT Circuit (PLL Unit)
15
Parallel/Serial Converter (PLL Unit)
15
CPU (PLL Unit)
15
Mechanical Parts and Disassembly
16
Frame Disassembly Diagram
16
Frame Disassembly Table
18
PA Unit and Accessories Diagram
19
PA Unit and Accessories Table
20
Front and PLL Units Connector Assembly Diagram
21
Front and Main Circuits Connector Assembly Diagram
22
PA and Filter Units Connector Assembly Diagram
23
Adjustment Procedures
24
Preparation before Servicing
24
Required Test Equipment
24
Connection Diagram
24
PLL Adjustment
25
PLL and DDS Units View
26
Receiver Adjustment
27
Main Unit Illustration
28
Transmitter Adjustment
29
PA and Filter Units Illustration
29
Board Layouts
32
Front Unit Boards
32
SW Unit Board
32
VR Unit Board
33
Main Unit Board
34
PLL Unit Board
36
PA Unit Boards
38
Filter Unit Board
38
DDS Unit Board
40
AM . FM Unit Board (Optional)
41
Parts List
42
Front Unit Parts
42
Main Unit Parts
42
PLL Unit Parts
48
DDS Unit
52
PA Unit
52
Voltage Diagram
55
Front and Main Units Voltage Diagram
55
PLL and PA Units Voltage Diagram
60

Icom IC-725 Instruction Manual (40 pages)

HF ALL Band Transceiver

Brand: Icom | Category: Transceiver | Size: 3 MB

Cautions
2
Features
2
Unpacking
2
Accessories Included
2
Table of Contents
3
Control Functions
4
Front Panel
4
Rear Panel
6
Microphone (HM-12)
6
Function Display
7
Installation
8
Mounting the Transceiver
8
Antenna
8
Wiring the DC Power Cable
8
Rear Panel Connections
9
System Interconnections
10
Power Supply Connections
10
Linera Amplifier Connections
11
Connecting the IC-2KL
11
Connecting a Non-Icom Linear Amplifier
11
Antenna Tuner Connections
12
Connecting the IC-AT500
12
Connecting the AT-150
12
Connecting the AH-3 or AH-2
12
AH-3 Operating Procedures
13
AFSK Terminal Unit Connection
13
HM-12 Schematic Diagram
14
ACC Socket Information
14
ACC (1) Socket
14
ACC (2) Socket
14
Remote Jack (CI-V) Information
15
CT-17 Connection
15
Address
15
Transceive
15
Initial Settings
16
Frequency Selection
16
Band Selection
16
Tech Talk from Icom
16
Operating Frequency Selection
17
Receiver Controls and Switches
18
Transmitter Controls and Switch
19
Basic Operation
20
SSB Operation
20
SSB Receiving
20
SSB Transmitting
20
CW Operation
21
AM Operation
22
FM Operation
23
FM Receiving
23
FM Transmitting
23
Subaudible Tone Transmitting
23
RIT Function
24
Split Operation
24
Using VFO a and B Modes
24
Using Memory Channel 23 or 24
24
Memory Channel Operation
25
VFO and Memory Mode Selection
25
Memory Channel Selection, Memory Writing
25
Frequency Transferring (M - VFO)
25
Scanning Operation
26
Programmed Scan
26
Memory Scan
26
Selected Mode Memory Scan
26
Maintenance and Adjustment
27
Disassembling the Transceiver
27
Opening the PA Unit
27
Fuse Replacement
28
CPU Resetting
28
CPU Backup Battery
28
Circuitry Fuse Replacement
28
Troubleshooting
29
Adjustments
30
Main Dial Brake Adjustment
30
PA Unit Idling Current
30
RIT Control Adjustment
31
Scan Function Adjustment
31
BFO Adjustment
31
Installation of Options
32
UI-7 am FM Unit
32
UT-30 Programmable Tone Encoder Unit
32
CR-64 High-Stability Crystal Unit
33
Inside Views
34
Main Unit View
34
PLL Unit View
35
Specifications
36
Options
37

Icom IC-725 Instruction Manual (38 pages)

HF ALL BAND TRANSCEIVER

Brand: Icom | Category: Transceiver | Size: 4 MB

Icom IC-725 Service Manual (67 pages)

HF All band transceiver

Brand: Icom | Category: Transceiver | Size: 4 MB

Table of Contents
3
Circuit Description
8
Receiver Circuits
8
Pll Circuits
13
Logic Circuits
14
Regulator Circuits
15
Section 5 Mechanical Parts and Disassembly
16
Frame Disassembly
18
Front and Pll Units Connector Assembly
21
Front and Main Units Connector Assembly
22
Pa and Filter Units Connector Assembly
23
Preparation before Servicing
24
Pll Adjustment
25
Receiver Adjustment
28
Transmitter Adjustment
29
Main Unit
36
Fm Unit (Optional)
41
Section 8 Parts List
42
Front and Main Units
60
Pll and Pa Units
61

icom IC-725 Instruction Manual (39 pages)

HF ALL BAND TRANSCEIVER

Brand: icom | Category: Transceiver | Size: 2 MB

Cautions
2
Operating Cautions
2
Introduction
2
Unpacking
2
Table of Contents
3
Control Functions
6
- Rear Panel
  6
- Microphone (Hm-12)
  6
- Function Display
  7
Installation
8
- Unpacking
  8
- Mounting the Transceiver
  8
- Antenna
  8
- Grounding
  8
- Wiring the DC Power
  8
- Rear Panel Connections
  9
System Interconnections
10
- Power Supply Connections
  10
- Linear Amplifier Connections
  11
- Antenna Tuner 3-4
  12
  - Operating Procedures
    13
- Afsk Terminal Unit Connection
  13
- MIC Connector
  13
- Acc Socket Information
  14
- Remote Jack
  15
  - Information
    15
Pre-Operation
16
- Initial Settings
  16
- Frequency Selection
  16
- Vfo a and Vfob
  17
- Receiver Controls
  18
  - And Switches
    18
- Transmitter Controls
  19
  - And Switch
    19
Basic Operation
24
- Rit/Af FUNCTION
  24
- Split Operation
  24
  - Cable
    29
  - Information
    31
Adjustments
31
Installation of Options
32
Am Fm Unit
32
Programmable Tone
32
High-Stability Crystal
33
Carrying Handle
33
Unit
33
Main Unit
34
Pll Unit
35

Icom IC-725 Service Manual (67 pages)

HF ALL BAND TRANSCEIVER

Brand: Icom | Category: Transceiver | Size: 4 MB

Table of Contents
3
Specifications
4
Inside Views
5
Circuit Description
8
Pll Circuits
13
Regulator Circuits
15
Mechanical Parts and Disassembly
16
Frame Disassembly
18
Front and Pll Units Connector Assembly
21
Main Unit
21
Pll Unit
21
Dds Unit
21
Am • Fm Unit (Optional)
23
Parts List
42
Voltagediagrams
55
Front and Main Units
60

Icom IC-725 Service Manual (67 pages)

HF All Band Transceiver

Brand: Icom | Category: Transceiver | Size: 5 MB

Icom IC-725 Instruction Manual (40 pages)

Hf All Band transceiver

Brand: Icom | Category: Transceiver | Size: 2 MB

Icom IC-725 Instruction Manual (39 pages)

HF ALL BAND TRANSCEIVER

Brand: Icom | Category: Transceiver | Size: 3 MB

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