Realistic 20-127/9127

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Summary

Specifications

Block Diagram

Principles of Operation

General Operation Outline

Alignment;Adjustment

Alignment and Test Points Locations

Overview of test points and component layout for alignment procedures.

Alignment Preparation

Required test equipment and initial setup for alignment procedures.

Reference Frequency OSC Alignment

Procedure for aligning the reference frequency oscillator.

IF Section Alignment

Procedure for aligning the IF section of the receiver.

VCO Alignment

Procedure for aligning the Voltage Controlled Oscillator (VCO).

RF Amp Alignment

Procedure for aligning the RF amplifier stages across different bands.

Overall Alignment and Sensitivity Measurement

Final checks and measurements for overall performance and sensitivity.

Zeromatic Function Test Procedure

Test procedure for the Zeromatic function.

Trouble Shooting

Electrical Parts List

Semiconductor Lead Identification and IC Diagram

Integrated Circuit Lead Identification

Pinout diagrams and functional blocks for various integrated circuits.

Microprocessor (IC7) Port Format

Detailed pinout and function for the main microprocessor IC.

Transistor Lead Identification

Diagrams showing the pin configurations for different transistor types.

Diode Identification and Lead Polarity

Visual guides for identifying diodes and their polarity.

Appendix

VHF-MID Band Alignment for 20-9127

Specific alignment procedures for the VHF-MID band.

Power Transformer Specification

Schematic Diagram