Instruction manual

ACU-1000 Operations Manual
Interoperability Now 3-5
3.4 Local Operation Considerations
3.4.1 Unit Power-Up
Prior to initial power-up, ensure the ACU-1000 is correctly configured for the AC or DC power
source being used. If using 220 VAC, make sure the unit is not configured for 110 VAC, or
damage may result. Depress the Main Power Switch on the PSM-1A module. Either the AC
or the DC LED below the power switch should light and the green +12V and -12V LEDs
should light. The ACU-1000 will run internal start-up tests, and then begin operation.
3.4.2 Removal and Replacement of Modules
The ACU-1000 Modules, with the exception of the power supply, can be "Hot-Swapped"; they
can be removed and inserted while the unit's main power is on without resulting in damage. If
a module that is presently communicating with a second module is removed, that link will be
lost. If the CPM-4 module is removed, all system operation ceases. The CPM-4 will not be
damaged by Hot-Swapping; however, it is advised to turn the power off when replacing the
CPM-4.
CAUTION: Turn Power OFF and disconnect the ACU-1000 from its AC
and DC power sources before removing or replacing the PSM-1A Power
Supply Module.
3.4.3 Front Panel Controls and Indicators
All front panel controls and indicator LEDs are explained below, starting at the left side of the
unit. The module that contains the control or indicator is listed in parenthesis. Refer to for
Front and Rear panel views
3.4.3.1 Power Switch (PSM-1A)
The Power switch controls the AC line and DC power to the unit.
3.4.3.2 +12V and -12V Indicators (PSM-1A)
These green LEDs are driven from the corresponding power supply output voltages and are
illuminated whenever the unit's main power is on. An unlit -12V or +12V LED when the AC
or DC indicators are on could indicate a failed power supply voltage.
3.4.3.3 AC and DC Indicators (PSM-1A)
One of these yellow LEDs, situated below the Power Switch, will be illuminated whenever the
unit's main power is on and the power supply circuitry is functioning correctly. If the unit is
operating on AC input voltage, the AC LED will be on, if it's operating on DC input, the DC
LED will be illuminated.
3.4.3.4 Speaker Switch (HSP-2A)
This switch turns the front panel speaker on and off. It does not affect the headphone audio or
the external speaker driver audio signal available at the rear panel.