Boss Audio DST3000D User Manual in English - Page 8

TROUBLE SHOOTING GUIDE. 30bS AUDIO SYSTEMS This section provides you with a catalog of amplifier symptoms and their probable causes and solutions. Before you consult this listing, make sure the vehicle's electrical system is working properly by verifying that other electrical items (e. g. headlights, windows, etc.) Still function correctly. SYMPTOM No Audio PROBABLE CAUSE Low voltage or no remote turn on voltage Blown Fuse Power wires not connected Damaged or unconnected speakers SOLUTION Check remote turn-on voltage at amp and head unit Replace with new fast-blow fuse Check butt splices or solder joints Check ground and battery connections Use VOM or DVM to measure speaker coil impedance; check speaker wiring connections Distorted Audio Input Sensitivity not set properly or damaged speaker cones Audio Level Low Weak Bass Low turn-on voltage Mute circuit on head unit is on. Crossover setting too low Speakers wired with wrong polarity, causing cancellation of bass frequencies External Fuse Blowing Whining noise on audio with engine running Incorrect wiring or short circuit Amplifier is picking up alternator noise Ticking noise on audio with engine running Amplifier is picking up radiated spark noise See adjustment procedure and check each step; Inspect each speaker for damage and repair or replace suspected component Refer to head unit owner's manual Check electrical system for low voltage; Check ground connection Check polarity of wires from amplifiers to each speaker as defined by the system design Check battery voltage at amplifier during operation Refer to electrical installation and check each installation step Install an in-line noise filter on the head unit's power wire; Check alternator routing diodes or voltage regulator for proper operation. Check all grounds , battery voltage, and RCA cables Check RCAaudio cable; Install an in-line noise filter on the head unit's power wire. Check spark plug wires. Disu -r Amplifier User's Manual - page 7