Parasound
®
ZoneMaster
™
450 Owner’s Manual
Page 14
Front Panel Power Button and Display
Power Button
If the Turn On Options switch is set to the Manual position, pushing the Power button turns on all
channels/zones. When turned on the ring around the Power button and the 4 channel status indicators will
illuminate green. Pushing the Power button again turns off all channels/zones.
If the rear panel Turn On
Options switch is not set to
“
Manual
”
the front panel power button will not operate.
Channel Indicators (1 - 4)
The channel numbers on the front panel illuminate according to each
channel’s operational status. Both
channel number indicators for a zone will always illuminate together. When a zone is turned on, both of the
channel number indicators for that zone will illuminate green. For zones that are not turned on the
corresponding channel pair indicators will not illuminate.
Channel indicators are illuminated by channel pairs that correspond to two zones:
Ch 1-
2 = Zone 1 Ch 3-
4 = Zone 2
Green:
Indicates normal operation.
Red:
Indicates the protection circuit has suspended operation of that channel pair to protect them from an
overload or because one or both of their speaker wires are short-circuited. The indicators might also
alternate flashing green and red, depending on the musical content and volume levels. This also indicates a
problem. Both channel number indicators for a zone will always illuminate the same color. Causes for the
front panel indicators to illuminate red are:
The speaker outputs for one or both channels of that zone are short-circuited (negative
to positive) either at the amplifier, at the speaker or somewhere along the speaker wire.
The negative speaker terminals have been combined (L- to R-).
Too many speakers are connected and the combined impedance is below 2 ohms. Or
below 4 ohms when that zone is set to Bridged Mode.
The unit has overheated. Provide more ventilation or use a fan.
The AC line voltage has exceeded the maximum allowed (132V when set for 115V or
264V when set for 230v,
depending on your region’s mains voltage).
The amplifier has been damaged.
Checking for Short Circuits on the Speaker Outputs
If your ZoneMaster 450
’s front panel indicators are illuminated red or alternate illumination between green
and red this indicates a problem. Your first step is to immediately turn off the amp. The most likely cause
will be a short circuited speaker connection. To check for this type of fault temporarily unplug both of the
green speaker output connecting blocks. Now turn the amp back on and play music. If the front panel
lights now illuminate green then
you’ve eliminated the amp as the source of the problem. Please check
your speaker wires and attached speakers for short circuits or impedance below 2 ohms in Stereo Mode or
4 ohms in Bridged Mode.
