Ac Mains Fuse; Grounding; Electrical Ground; Audio Ground - EAW DSA250 & DSA230 Owner's Manual

The LED should then go off. See Section 6.1.2 for other LED indications.
If it is desired to completely power off (de-energize) the loudspeaker,
a conveniently located AC mains disconnect must be supplied or
the power cable must be unplugged from the loudspeaker or the AC
mains supply.
The PowerCon connector is a locking connecter. To lock, twist 1/4 turn
clockwise after fully inserting into the jack. It is recommended the
connection be made at the loudspeaker before connection to the AC
mains supply.
5 . 3 . 4 A C M A I N F U S E :
If excessive AC mains input current is detected, the replaceable fuse will
blow. This can occur for a variety of reasons, such as internal failure,
excessive AC mains voltage, or excessive amplifier output levels.
If the fuse blows, replace it only with a fuse of the correct type and
rating as listed below. In the unlikely event the fuse blows again, inter-
nal failure is indicated. This will require troubleshooting and repair
by a qualified service technician. Do not attempt further use of the
loudspeaker until such repairs are made. See Section 8.2 "Troubleshooting".
Fuse Type: AGC (0.25 in x 1.25 in) slow-blow
Rating: 115 V AC
DSA230 4 A
DSA250 8 A
5 . 4 G r o u n d i n g
5 . 4 . 1 E L E C T R I C A L G R O U N D
Ensure that the AC mains grounding conductor in the power cable is
properly grounded in accordance with applicable electrical codes.
5 . 4 . 2 A U D I O G R O U N D
The Audio Ground Lift switch may help isolate audio ground loops.
This dip switch disconnects the shield pins on all the audio connectors
from the internal audio ground. This affects the audio shield pins on
the Audio A and Audio B connectors. Use this switch as needed for
reducing ground loop noise.
230 V AC
2 A
4 A
SIGNAL END
Figure 5.4.2a Ground Lift Switch
Figure 5.3.3 Connecting AC Mains
GROUND LIFT SWITCH
CAP
FUSE
POWER END
Figure 5.3.4 Fuse
2X
AUDIO
SHIELD
PINS
AUDIO
EMI
GROUND
AUDIO A
FILTER
LIFT
SWITCH
LIFT
EMI
AUDIO B
FILTER
CHASSIS/MAINS
GROUND
Figure 5.4.2b Ground Lift Function
HOUSING
AUDIO
GROUND
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