ATI Audio ML200 - Manual (Page 5)

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BATTERY OPERATION
Alkaline battery packs (BBU100-1), 24 VDC gel call rechargeable battery packs
(PPA-1) and a DC converter (DCA100-1) to operate from 12 V belt peck, NP-1 or
auto batteries.
48 VDC Phantom Power (DMA103 only)
A DC converter (PH4801) can boost the phantom power up to 48 VDC.
MAINTENANCE
There is no routine required by your NANOAMP. If you have a problem, check
the panel LED indicators to assure that the units have DC power, eliminate by
substitution input and output cables, connectors, downstream device, DC
interconnect cables and Wall Wart power supplies.
POWER SUPPLY LEVELS
The recommended loaded DC input voltage range is 22 VDC minimum to 32
VDC maximum over the full range of AC line voltage tolerances. The audio
circuits will continue to work with reduced headroom below 22 VDC but the
phantom microphone power will drop out of regulation. Momentary surges up to
36 VDC will cause some increased internal heating.
OPERATING POINTS
An Internal reference voltage equal to ½ the supply voltage is generated. All
audio stage IC inputs and outputs should show a DC level equal to this voltage
when measured with a high impedance meter. Audio inputs and outputs are
capacitor coupled and ground referenced.