Owner's Manual

Parasound
®
ZoneMaster
™
2350 Owner’s Manual Page 7
Front Panel Buttons and Display
Power Button
If the Turn On Options switch (on the rear panel) is set to the Manual position, pushing the Power button
turns the Model 2350 on and off. When it’s turned on the ring around the Power button and the 2 channel
status indicators will all illuminate green. Pushing the Power button again turns the unit off. If the rear
panel Turn On Options switch is not set to “Manual” the front panel Power button will not operate.
A and B Speaker Select Buttons
These buttons turn on the speaker pairs connected to the corresponding Speaker Output A and B terminals. If
the rear panel A/B Lockout switch is not set to “Normal” the front panel A and B buttons will not operate.
Channel Indicators 1 (Left) and 2 (Right)
The 1 and 2 indicators will illuminate green when the Model 2350 power is on and it is operating normally. The
1 indicator will not light if a fault is only in the left channel (channel 1). The 2 indicator will not light if a fault is
only in the right channel (channel 2). Neither indicator will illuminate if the unit has gone into protect or over-
temperature shut down.
Hi-Temp Indicator
Hi-Temp will illuminate red when the Model 2350 exceeds its maximum safe operating temperature. The amp
should be turned off immediately and the cause of excessive temperature should be corrected before turning
the amp on again. The usual cause is too many speakers attached and/or there is inadequate ventilation.
Protect Indicator
If the amp experiences an external fault condition the Protect light will illuminate red. This indicates the
2350’s protection circuit has suspended operation of both the Left (channel 1) and Right (channel 2) to
protect the unit from damage from an overload or because one or both speaker wires are short-circuited.
Your first step is to immediately turn off the amp. The indicator might also be flashing red depending on the
musical content and volume levels. This also indicates a problem. The most likely causes for the front panel
Protect light to illuminate red are:
 A short-circuited (+ to -) speaker connection for one or both channels either at the amplifier
connector, at the speaker or somewhere along the speaker wires.
 The negative speaker terminals have been combined (L- to R-).
 Too many speakers are connected and the combined impedance is below 2 ohms.
 The amplifier has been damaged.
Checking for Short Circuits or Overload
To check for a short temporarily disconnect the speakers from the amp’s speaker terminals. Now turn the amp
back on with music playing (which you obviously won’t hear because the speakers are disconnected). If the
front panel lights now illuminate green you’ve eliminated the 2350 as the source of the problem. Please check
your speaker wires and attached speakers for short circuits or an impedance below 2 ohms.