Realistic DX-390 - User Manual

Procedure to adjust the radio's clock time accuracy using a frequency counter.

Procedure to align the Phase-Locked Loop frequency using a frequency counter.

Procedure to align the AM 2nd Local Oscillator using a frequency counter.

Procedure to align the AM 2nd Intermediate Frequency using sweep generator and scope.

Procedure to align the FM Intermediate Frequency using sweep generator and scope.

Diagnosing weak FM reception by checking antenna, IF waveform, and PLL circuit.

Diagnosing weak AM reception by checking VCO, OSC, and IF stages.

Troubleshooting steps for PLL circuit malfunction including voltage and frequency checks.

Steps to diagnose and resolve issues with the radio not powering on.