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Kenwood TR-751A Service Manual

144mhz all mode transceiver

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Service manual (83 pages)

Instruction manual (58 pages)

Instruction manual (58 pages)

Table Of Contents

Table of Contents

Circuit Description
Frequency Configuration
TR-751A/E PC Board Chart
Crystal Filter 10F2.2S (L71-0249-05) Characteristics (Composit Unit (RX) XF1)
Receiver System
10.695Mhz (L71-0216-05) Characteristics (Composit Unit (RX) XF201
Front End and AGC Circuit
General
SSB Squelch Circuit
AGC Circuit Block Diagram
AGC Attenuation Comparison
Transmitter System
CW Circuit Description
CW Waveform
ALC and SWR Protection Circuits
PLL Synthesizer
PLL System Block Diagram
Digital Control Unit
Control Unit Block Diagram
MPU Interface Circuits
Reset Backup Circuit
Interface between Mpus and Reset Beckup Circuit
Key, Switch and Encoder Citcuits
Microphone Input Logic
Mode Voltage Switching and Standby Circuit
Other I/O Circuits
Test Points
Microprocessor Clock
Connectors
Test Pins
Μpd7507Sct-215 (MPU-III) Pin Functions (Control Unit IC4)
Μpd7514G-143-12 (MPU-II) Pin Functions (LCD Assembly IC301)
Element Functions
Final Unit (X45-1490-11)
Control Unit (X53-1460-XX)
LCD Assembly (W02-037X-05)
Composite Unit (PLL, TX) (X60-1310-XX)
CW Break-In (X59-1130-00)
Composite Unit (RX) (X60-1320-XX)
FM Microphone Amplifier (X59-1090-00) S/No. 705-707XXXX: W, T
-6V DC-DC (X59-1100-00)
AF Preamplifier (X59-1110-00)
Squelch Switch (X59-1120-00)
Parts List
Capacitors
Resistors
Dimension
Semiconductor
TR-751A/E General
Final Unit (X45-1490-11)
Control Unit (X53-1460-XX)-11: K, M1 -21: M2 -51: T -61: W
Sub VCO (X58-1000-XX) -00: W, T -11: K, M1, M2
FM MIC AMP (X59-1090-00) S/No. 705-707XXXX: W, T
-6V DC-DC (X59-1100-00)
Af Pre Amp (X59-1110-00)
Squelch Switch (X59-1120-00)
CW Break in (X59-1130-00)
FM MIC AMP (X59-3000-00) S/No. 705-707XXXX: K, M1, M2 FM; MIC AMP (X59-3000-01) S/No. 708XXXX-: K, M1, M2, W, T
Composite Unit (PLL, TX) (X60-1310-XX) -11: K, M1, M2 -01: W, T
Composite Unit (RX) (X60-1320-XX) -00: W, T -11: K, M1, M2
Exploded View
Level Diagram
RX Section
TX Section
Adjustment
Required Test Equipment
Preparation
MIC Terminals (View from Front Panel Side)
TX-RX Adjustment (Common)
PLL System Adjustment
Receiver System Adjustment
Transmitter System Adjustment
Microprocessor Operation Check
Top View
Bottom View
Block Diagram
PC Board Views
Control Unit (X53-1460-XX) -11: K, M1 -21: M2 -51: T -61: W
Component Side View
Foil Side View
Circuit Diagram
SUB VCO (X58-1000-XX) -00: W, T -11: K, M1, M2 Component Side View
Squelch Switch (X59-1120-00) Component Side View
FM MIC AMP (X59-1090-00) Component Side View
CW Break in (X59-1130-00) Component Side View
Final Unit (X45-1490-11) Component Side View
Final Unit (X45-1490-11) Foil Side View
Composite Unit (PLL, TX) (X60-1310-XX) -11:K, M1, M2 -01: W, T Component Side View
Composite Unit (PLL, TX) (X60-1310-XX) -11:K, M1, M2 -01: W, T Foil Side View
Composite Unit (RX) (X60-1320-00) S/No. 705-707XXXX: W, T Component Side View
Composite Unit (RX) (X60-1320-00) S/No. 705-707XXXX: W, T Foil Side View
Composite Unit (RX) (X60-1320-XX) Foil Side View -00: W, T -11: K, M1, M2 S/No. 708XXXX-: K, M1, M2, W, T
Composite Unit (RX) (X60-1320-11) S/No. 705-707XXXX: K, M1, M2
Schematic Diagram
Composite Unit (RX) (X60-1320-XX) Components Side View -00: W, T -11: K, M1, M2 S/No. 708XXXX-: K, M1, M2, W, T
Schematic Diagram

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1 Frequency Configuration
2 Circuit Description
3 General
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Kenwood TR-751A Service Manual

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