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Manuals
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Icom Manuals
Transceiver
IC-271E
Maintenance manual
Icom IC-271E Maintenance Manual
144 mhz
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Also See for IC-271E
:
Instruction manual
(32 pages)
,
Service manual
(71 pages)
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Table Of Contents
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Contents
Table of Contents
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Table of Contents
Table of Contents
Specifications
General
IC-271 Versions Available
Control Functions
Front Panel
Rear Panel Connections (IC-271 A/E)
Accessory Socket Connections
Outside View
Rear Panel Connections (IC-271 H)
Controls under the Access Cover
Inside Views
Top View (IC-271 A/E)
Bottom View (IC-271 A/E)
PLL (HPL) Unit (Located under the Logic Unit)
Top View (IC-271 H)
Bottom View (IC-271 H)
Block Diagrams
IC-271 A/E
IC-271 A/H
Circuit Description
Receiver
RF Circuit (RF-YGR Unit)
Intermediate Frequency Circuit (Main Unit)
BFO Circuit (Main Unit)
Noise Blanker Circuit (Main Unit)
Audio and Squelch Circuits (Main Unit)
S-RF Meter Circuit (Main Unit)
Transmitter
Audio Amplifier and Limiter Circuits (Main Unit)
Buffer Amplifier Circuit (Main Unit)
Vox Control and CW Break-In Circuits (Main Unit)
Automatic Level Control (ALC) Circuit (Main Unit)
Transmitter Mixer and Buffer Amplifier (RF-YGR Unit)
Power Amplifier
ALC and Power Limiter (IC-271 H)
Power Amplifier Cooling System (IC-271 H)
PLL (HPL) Unit
Reference Oscillator and lo Circuits
HPL Unit Block Diagram
Mixer Amplifier Circuit
Prescaler Circuit
Loop Filter
Sub-Loop Circuit
Mode and Frequency Step Circuits
CPU Port Allocations
CPU Memory Map
Auto Tuning Rate(Ts), Program Scan (Ps), MIC Up/Down Circuits
Input/Output Control IC Port Allocations
Matrix Circuit
Display and PLL Strobe
Display Data
Mode, Memo, VFO, Scan and Rit Displays
Scan Circuit
MIC Up/Down Circuit
N Data
Tone Generator
Filter Unit (IC-271 H)
RF Meter Detector, SWR Detector, Protector Circuits
CSS and DC-DC Units
CSS (Center Scanning Stop) Circuit
Display Unit
Display Unit Circuit
Power Supply Switching Circuit (Main Unit)
Transmit/Receive Switching Circuit (RF-YGR Unit)
Terminal Circuit Board (IC-271 H)
Mechanical Parts and Disassembly
Frame Disassembly (IC-271 A/E)
Frame Disassembly (IC-271 H)
Front Panel Disassembly
Front Sub-Chassis Connector Assembly
Main Board Connector Assembly (IC-271 A/E)
Logic/Pll Board Connector Assemblies (IC-271 A/E)
Logic/Pll Board Connector Assemblies (IC-271 H)
Rear Panel Connector Assembly (IC-271 A/E)
Rear Panel Connector Assembly (IC-271 H)
Rear Panel Parts Disassembly (IC-271 A/E)
Rear Panel Parts Disassembly (IC-271 H)
Maintenance and Adjustment
Preparation before Servicing
PLL Adjustment
Main Unit
HPL Unit
Transmitter Adjustment
Tone Unit
RF YGR Unit
PA Unit (IC-271 H)
Logic Unit
Receiver Adjustment
CSS Unit
RF-YGR Unit
VR Unit
Circuit Diagrams/Voltage Charts
EF Unit
Terminal Unit (IC-271 H)
Tone Unit (#02, 05)
Transistor Voltage Chart
IC Voltage Chart
Board Layouts (IC-271 H)
IC Specifications
Parts List
IC-271 A/E Schematic Diagram
IC-271 H Schematic Diagram
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Specifications
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IC-271 A/E Schematic Diagram
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See also:
Service Manual
,
Instruction Manual
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