Audio Developments AD144 - Manual (Page 7)

6
MAINS POWER SUPPLY
Also refer to IMPORTANT SAFETY INSTRUCTIONS
XP plc
Model No AEH45UM21
The mains POWER SUPPLY UNIT is suitable for driving an Audio Developments
AD144 Mixer. This power supply unit has two voltage rails: +12V DC and -12V DC,
capable of supplying a minimum of 1A per rail, power the audio electronics. (The
+48V DC rail, capable of supplying 300mA, is generated internally using a DC-DC
Converter and powers the phantom supply for condenser microphones).
NOTE: The AEH45UM21 power supply unit is designed to power mixers without an
internal battery facility - and therefore no DC-DC Converter exists to generate
the+12V & -12V supplies. If such facilities are available, a power supply unit which is
a single-rail device, must be used.
The AEH45UM21 may be powered from either a 110/120V AC source or a 220/240V
AC source. The power supply unit automatically recognises the different source
voltages. Operating the equipment at the wrong voltage could be hazardous.
For connecting the power supply unit to the mains, always use a suitable nationally
approved cord set. If such a set is unavailable, care must be taken to connect the
LIVE, NEUTRAL and EARTH pins of the power supply’s IEC mains connector to
the corresponding terminals associated with the AC source. This work must be
undertaken by a qualified engineer.
FOR SAFETY REASONS, AEH45UM21 POWER SUPPLY UNIT MUST BE
CONNECTED TO MAINS EARTH. Any maintenance
to the power supply unit or its
mains cable assembly must be performed by a suitably qualified engineer.
FUSES: It is recommended that the mains power cord is fused.
For continued safety the specified fuse link must be fitted in the mains fuse holder
when a replacement is required. Ensure it is of a type approved by a National
Approved Body.
Each DC supply rail is protected by its own fuse - fitted
internally: refer to the
TECHNICAL LIBRARY . Only suitably qualified personnel must service the power
supply unit. If any fuse link fails it is strongly recommended the cause is traced.
Only genuine spare parts with identical specifications must be used.
It is DANGEROUS to change the specification or modify the product in any way.
250mA HRC TYPE T 240V AC