Why does the Low (Mid) band not operate on my Realistic PRO-2020 Receiver?
If the Low (Mid) band isn't working on your Realistic Receiver, but Air, Hi, and UHF bands are, it could be due to: * A defective Low band RF Amp, mixer, or VCO circuit, needing inspection and replacement of the circuit components. * Defective IC-9, 10, 0117 or associated components, which should be replaced.
Why does the Aircraft band not operate on my Realistic PRO-2020, but Low, High, and UHF do?
If the Aircraft band doesn't work on your Realistic Receiver while Low, High, and UHF bands do, the problem may be: * Defective D105, 107, 0114, 115 or associated components, which should be replaced. * A defective AM IF Amp including 0120, 121, D120, requiring replacement of the AM IF Amp or associated components.
Why do Aircraft and High bands not operate on my Realistic Receiver, but Low and UHF do?
If the Aircraft and High bands aren't working on your Realistic Receiver, but the Low and UHF bands are, it might be caused by: * Defective 0104 -106 in the RF Amp mixer or VCO circuit, needing inspection and replacement. * Defective 0114 -116 in the band switch circuit, which should be replaced.
Why does the UHF band not operate on my Realistic PRO-2020, but Low, Air, and High do?
If the UHF band isn't working on your Realistic Receiver, but the Low, Air, and High bands are, it could be due to: * Defective 0108 - 111 in the RF Amp mixer or VCO circuit, which should be replaced. * Defective 0113 in the band switch circuit, needing replacement.
Guides users through basic functions like scanning, manual selection, and programming.
Step-by-step instructions for safely disassembling the receiver unit.
Covers alignment of reference frequency, IF section, VCO, and RF amplifier stages.
Specific steps for aligning RF amplifier stages for VHF and UHF bands.
Procedure for final alignment and checking the Zeromatic function.
Illustrations of key internal timing and signal waveforms for diagnostics.
Flowcharts for checking memory functionality and reception performance.
Illustrates the electrical connections between components.
Visual representations of component placements on circuit boards.
Detailed electrical circuit schematics for logic and linear sections.
Lists common symptoms and their potential causes for diagnosing faults.
Technical performance data and operational limits of the receiver.
Provides pinout diagrams and identification for integrated circuits.
Details the function of each port pin on the main micro-computer IC-1.
Specific alignment procedures for VHF-MID band models.
Diagram showing the physical layout and assembly of unit components.
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