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Problem Cause
No music signal on loudspeakers ● + 12 V and/or GROUND (GND/ -12V) and/or
and STATUS-LED on amp is off ● “Remote” line not (properly) connected
● Fuse on amplifier or distributor blown
● Main Fuse on car battery side blown
● Short-circuit on any of the speaker outputs
● DC voltage at speaker outputs
● Amplifier overload
● Amplifier overheat
A high-pitched buzzing sound ● Bad ground (GND) conntact of amplifier or head unit /CD/MD-changer
in- or decreasing with engine speed ● Insufficiently shielded RCA interconnects and/or bad RCA cable routing
(inductive interference of on-board electronics)
Crackling sound in- or decreasing ● Insufficient interference elimination of ignition circuitry
with engine speed
Humming ● Sign of ground loop(s), i.e. multiple ground connections of the car audio
installation or parts thereof. Use the rubber grommets supplied for an
electrically insulated mounting of the amplifier
● Check also ground connections of all other audio components conncected
IMPORTANT! The amplifier’s protection circuitry will shut-off the amplifier in case of short-circuit, overload or DC offset at the speaker out-
puts or in case of overheat. There will be an automatic re-start after approx. 5 sec. In case the cause for protection shut-off has been
eliminated, the amplifier will operate normally again (LED on). Otherwise the amplifier will continue switching-off!
TROUBLESHOOTING
H
C202 402 502 (D+E) 30.04.2001 10:14 Uhr Seite 37
