User manual

(4.0E) 6-1
no sound
POW ER switch on?
turn PO W ER switch on
fuses o.k.?
replace fuse
m ains vo ltage in
200..265V range?
supply voltage within lim its
po ssibility of A 1 failure
fan working?
PROT LED on?
POWER LED
TEM P LED flashing?
wrong box connected
clean filter foam
check air supply
w ait m ax. 15 min.
try again
ISP LED on?
CO/M muted?
CA-COMs
fitted correctly?
PROT LED on?
check signal wiring and
signal source
release MUTE switch
works with other
speaker cable?
works with other box?
cable failure
speaker failure
po ssibility of A 1 failure
correct box connected?
wire correctly
press and release
MUTE switch
if still not o.k.:
turn PO W ER switch off,
wait 2 m in.,
turn PO W ER switch on
ID LED
no
no
no
yes
no
yes
no
yes
no
yes
yes
no
off
flashing
no
off
flashing
on
on
6. Troubleshooting