Requires 6 "D" cell batteries for the radio and 2 "AA" batteries for the clock/memory backup. AC Adapter: Operates on a 9V DC negative-center adapter.
This comprehensive guide serves as an expanded, highly detailed owner's manual and reference guide for the RadioShack DX-390, covering everything from basic setup to advanced shortwave tuning techniques. Introduction and Technical Specifications radio shack dx-390 owners manual
| Symptom | Likely cause | Solution | |---------|--------------|----------| | No power | Dead batteries / wrong adapter polarity | Check battery contacts, clean with pencil eraser. Use center-negative adapter. | | Weak or no FM | Whip antenna broken | Replace with 75cm whip (Sangean part). Or clip wire to stub. | | Display digits missing | Bad zebra strip connection | Open case, clean LCD contacts with isopropyl alcohol. | | Tuning knob feels loose | Coupler cracked (plastic) | Replace coupler or 3D print one (DX-390 uses 6mm D-shaft). | | High noise on AM/SW | Internal battery corrosion | Clean board with vinegar, then IPA. Check capacitors near audio amp. | | Memory resets often | Backup capacitor (C203) failed | Replace 0.1F 5.5V supercapacitor (Panasonic EECS0HD104H). | Requires 6 "D" cell batteries for the radio