12
AC Power Connections and AC Grounding
Before you connect the AC cord, make sure your Z-12’s front panel Power Switch is in its off
position and any external auto on trigger source is inactive.
If possible, plug your Z-12 directly to the same AC outlet that powers your accompanying
audio components and the system controller. If you don’t use the same AC outlet, you will
likely encounter 60 Hz (domestic, 50 Hz abroad) hum from the differing ground potentials
between the AC outlets.
Operating the Zonemaster Z-12
Refer to Drawing on Page 5
Power Switch
Manual Turn On
Press the upper half to turn the unit on manually; press the lower half to turn the unit off.
Automatic Turn On
When the Power Switch is in its Off position, your Z-12 can still be turned on with an external
voltage applied to its Auto On Trigger Jack. Both Manual On and Auto On turn on power to
the entire amplifier, although they do not necessarily activate individual channel operation
(See Remote Enable).
Level Controls
Each channel has its own rear mounted “set and forget” input Level Control. Depending on
how you have configured the Z-12, you can use these controls to properly match the levels
from zone to zone or channel to channel. Each channel is marked on the top cover, to identify
levels without having to actually go behind the unit to view the Level controls.
Front Panel Indicators
AC Line Indicator
The amber AC Line indicator on the front panel lights when the AC power cord is connected
to a live AC source. It makes system troubleshooting simpler.
Standby Indicator
When the Z-12 is turned on, manually or automatically, the red Standby indicator will light
while its internal circuits are stabilizing and no audio signal will pass. After about five
seconds, the Standby indicator will turn off when the amplifier is operational.
The red Standby indicator will also light when an external or internal fault activates the Z-12
protection circuitry for any channel pair. Remove power to the amplifier and check the
speaker connections for a short circuit. During this time, the protection circuits should
automatically reset. If Standby remains lit after overload conditions or faulty speaker
connections are corrected, it may indicate an internal fault. If this occurs, contact your
Parasound Dealer, Installer or Parasound Technical Service for further advice.
