25
TROUBLESHOOTING
Symptom
Cause
No music signal on loudspeakers
■
+ 12 V and/or GROUND/ - 12 V)
and both LEDs on XP500.1 are off
and/or
■
„Remote” lead not connected
■
Fuse on distributor blown
■
Main Fuse on car battery side blown
No audible music/bass from subwoofer
■
no subwoofer connected
but REMOTE and OPERATING/POWER LEDs
and/or
are both on
■
RCA input not properly connected
to XP500.1 (see INPUT MODES)
and/or
■
RCA output from head unit not connected
and/or
■
REMOTE SUB-BASS LEVEL CONTROL
not turned up high enough
Bass sounds distorted or ‘thin’ or ‘spongy’
■
incorrect/inappropriate LOWPASS F
LP
and/or
■
incorrect/inappropriate HIGHPASS F
HP
frequency settings
and/or
■
incorrect/inappropriate Q-Factor Q
LP
and/or
■
incorrect/inappropriate Q-Factor Q
HP
value settings (see manual) and/or
■
LOWPASS F
LP
setting on XP500.1 has been
shifted downward by connection of a lowpass
subwoofer pre-out signal from head-unit
OPERATING/POWER-LED is off
■
Short-circuit or DC on speaker output
■
Over-heating or over-loading of amplifier
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
■
Mono signal on RIGHT INPUT instead
of 1-CH/Mono LEFT INPUT only
■
Mono signal on both RCA inputs (LEFT &
RIGHT) instead of 1-CH/Mono LEFT INPUT only
110998 Man XP500.1 RZ (D+UK) 14.10.1998 9:34 Uhr Seite 25
