Viola Symphony Manual Rev 1
12 of 15
9
th
September 2005
TROUBLE SHOOTING
Most problems may be resolved by following the steps below. If these fail, please
contact your VIOLA dealer, national VIOLA distributor or VIOLA directly.
1. No sound and the front panel LED is not lit?
•
Press the front panel power switch to confirm that the unit is not
switched off. If there has been a temporary interruption to the mains
supply, or the supply voltage has dropped below certain limits, the unit
will automatically shut down and cannot be restarted until the mains
voltage returns within the normal operating range. The drop-out voltage
and normal operating range for 120V and 240V units are shown below.
Mains Setting
Drop Out Voltage
Normal Operating Range
120V
90V
90V – 140V
240V
180V
180V – 280V
•
Check that the power lead is fully home in the AC input receptacle on
the rear panel, the other end is plugged into the AC wall socket and if
applicable, that the wall socket is switched on.
•
Check that there is power on the AC wall socket by connecting another
piece of equipment that is known to work to the socket.
•
Check the mains fuses as shown in the
MAINS FUSES
section of this
manual.
2. No sound and the front panel LED is lit?
•
Check all the signal wiring in the system.
•
Check that all the units feeding the amplifier are switched on.
•
Check that any input selector and other relevant switches are set
appropriately.
•
Check that the signal source is playing.
•
Check that the pre-amplifier and or signal source volume control(s) are
set at a level that is loud enough to hear.
3. The amplifier keeps shutting down?
•
Disconnect the inputs to both channels and also the speaker cables.
•
Try to switch the amplifier on. If it starts but then shuts down, contact
your VIOLA dealer, national VIOLA distributor or VIOLA for assistance.
If it starts (front panel LED comes on) and it stays on, there is either a
fault with the signal source such as a DC voltage on one or both channels,
or a short circuit in the speaker cables or speaker. This may be isolated
in the following steps.
•
Switch the amplifier off and reconnect one channel from the signal
source. Switch the amplifier on. If it starts (front panel LED comes on)
