User manual

(5.0E) 6-1
no sound
POWER switch on?
POWER-LED ?
fuses o.k.?
fan running?
TEMP LED flashing?
PROT LED on?
Number of boxes
connected o.k.?
ISP LED on?
works with other
cable?
CO/M muted?
loudspeakers wired
correctly?
possibility of mainframe
failure
supply voltage
within limits
wire correctly
release MUTE button
turn POWER switch on
check wiring, replace fuse
yes
no
off
no
flashing
mains voltage
within limits?
yes
yes
no
yes
yes
PROT LED on?
no
on
no
Clean filter foam, check air supply. Mainframe
should come on again after max. 15 min.
Otherwise possibility of shorted speaker cable.
Disconnect cables and try again.
PROT LED on?
yes
no
no
no
check signal wiring and
signal source
no
possibility of mainframe
failure
yes
yes
cable failure
yes
works with other box?
no
speaker failure
yes
no
yes
turn POWER switch off
Disconnect speaker cables
turn POWER switch on
no
yes
no
yes
no
yes
6. Troubleshooting