Clarion APX640.4 - Manual (Page 16)

APX640.4/640.2/320.2/DPX1001.1
16
TROUBLESHOOTING
Problem
No Audio.
Solution
Low or no remote turn-on voltage: Check remote connections at amplifier and source
unit.
Blown amplifier fuse: Replace with new fast-blow fuse (same rating).
Power wires not connected: Check battery and ground wiring at amplifier; also check
battery connections.
Speaker leads shorted: Check speaker continuity to ground, it should not show a com-
mon ground.
Speakers not connected or are blown: Check speaker connections at amplifier, measure
coil impedance.
FINAL SYSTEM CHECKS
1. Start the engine and turn on the source unit. After a two-second delay, slowly
increase the volume control and listen to the audio. If you hear any noise, static, dis-
tortion or no sound at all, check the connections, and also refer to troubleshooting
section below. Depending on your system design, the levels may become quite loud
even at low volume control settings. Until you get an “audio feel” of the system’s
power, use care when adjusting controls.
2. Turn the balance controls to their extreme positions and listen to the results. Audio
output should match control settings (audio from the left speaker when balance is
left).
3. Increase the volume and verify that the amplifier reproduces audio (at full frequen-
cies) without distortion. If you hear distortion, check the connections and verify that
the gain control is set correctly. Another possibility is damaged speakers or under-
powered speakers. Once again refer to troubleshooting section for additional help.
TROUBLESHOOTING
Problem
Audio cycles on and off.
Solution
Thermal protection circuits are shutting amplifier off: Check location for adequate
ventilation; consult an authorized Clarion Audio Dealer.
Problem
Distorted audio.
Solution
Gain is not set properly, or damaged speaker cones: Review Setting Gain; inspect
each speaker cone for signs of damage (i.e., frozen cone, burning smell, etc.)
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