Name: Icom IC-765
Brand: Icom
Rating: 4 (1 reviews)

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Table of Contents2
Specifications3
Introduction5
Ordering Parts5
Danger5
Repair Note5
Inside Views6
Top View6
Red and Tuner (TUC) Units Are Attached6
Red and Tuner (TUC) Units Are Removed6
Bottom View7
Reg Unit View7
Tuner Unit View8
PA Unit View8
Circuit Description9
Receiver Circuits9
RF Switching Circuit (Ant SW and RF Units)9
RF Bandpass Filter (RF Unit)9
1St Mixer Circuit (RF Unit)10
Exactness 1St, 2Nd if Frequency10
IF Circuit (Main Unit)10
Receiver if Circuits10
Noise Blanker Circuit (Main Unit)11
Notch Filter Circuit (Main Unit)11
IF Shift Oscillator (Main Unit)11
BFO Circuit (Main Unit)11
Demodulator Circuits (Main Unit)12
AF Input Mode Selector Switch (Main Unit)12
AF Amp Circuit (Main Unit)12
AGC and S-Meter Circuit (Main Unit)12
Squelch Circuit (Main Unit)13
Transmitter Circuits13
MIC Amplifier (Main Unit)13
Compressor Circuit (Main Unit)13
CW/RTTY Carrier Oscillator (Main Unit)14
FM TX Oscillator (Main Unit)14
IF Circuits (Main and RF Units)14
RF Circuits (RF and PA Units)14
Filter Unit15
Antenna Switching Circuit (Ant SW Unit)15
ALC Circuit (Main Unit)15
APC Circuits (Main Unit)15
CE Keying Circuit (Main Unit)16
CW Sidetone Circuit (Main Unit)16
Transmitter Meter Circuits (Main Unit)16
T/R Switching Circuit (Main Unit)16
PLL Circuit Block Diagram17
Reference Oscillator Circuit17
PLL Circuits17
General Description17
Main Loop18
Sub Loop18
Mute Circuit18
Logic Circuits18
Band Selection Data19
Key Matrix (Matrix Unit)19
Antenna Tuner Circuits19
Motor Control Circuit19
Tuner Unit CPU Port Allocations20
Power Supply Circuits20
Rectifier Circuit (Reg Unit)20
Start-Up Circuit (Reg Unit)20
Switching Regulator (Reg Unit)21
Regulator Circuits21
Switching Regulator Block Diagram21
8 And 5 V Regulators21
Mechanical Parts and Disassembly22
Frame Disassembly22
Frequency Key Button22
Front Panel25
Rear Panel Parts List28
Tuner and MKR SW Units31
Unpacking33
Other Unit Connector Assembly34
Front Unit View34
Reg, PLL, MKR and Tuner Units35
Main and RF Units36
Rear Panel37
Parts List38
Display Unit38
MKR Unit38
Sensor Unit38
Front Unit39
SWR Unit40
DDS Unit41
Tuner Unit61
Reg Unit63
Adjustment Procedures65
Preparation before Servicing65
Required Test Equipment65
Connection65
PLL Adjustment66
PLL Unit View67
Receiver Adjustment68
Main Unit View69
Transmitter Adjustment73
NB VR Unit75
Filter Unit View79
Tuner Unit Adjustment80
TUC Unit81
TDET Unit (Located under the TUC Unit)81
REG Unit Adjustment82
Board Layout83
Display, MKR SW and Sensor Units83
Logic Unit85
Front (NB VR) Unit87
Front (NB SW) Unit87
Front (LED) Unit88
Front (AF VR) Unit88
PLL and DDS Units89
Component Side89
Foil Side89
Front (at SW) Unit90
Front (SWR) Module90
Front (Notch) Unit90
PLL Unit91
IDC Unit93
VOX Unit93
Main Unit94
Matrix Unit97
RF Unit99
PA Unit101
PA (ACC) Unit101
PA (ANT SW) Unit102
PA (Keyer) Unit102
Tuner (TUC) Unit103
Tuner (T DET) Unit103
Tuner (Relay) Unit104
REG and Filter Units105
Block Diagram107
Voltage Diagrams111
Front, Main and PA Units111
Display, Matrix, Logic, PLL, RF and MKR SW Units121

Brand	Icom
Model	IC-765
Category	Transceiver
Language	English

Icom IC-765 Service Manual

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Icom IC-765 Specifications

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