Parasound Halo A 51, Руководство пользователя

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TROUBLESHOOTING GUIDE
11
No power
Auto turn on doesn’t
function with a trigger
voltage
Auto turn on doesn’t
function with an audio
input signal
A 51 will not turn off when
audio signal is removed
Power on, but no sound
On-Off button glows red
and channel indicator(s)
off
Distorted sound
Hum and / or buzz
through speakers
A 51 is overheating
Power cord is disconnected
Auto Turn On selector switch
is in wrong position
AC fuse blown
DC trigger source wired in
reverse or voltage too low
Auto Turn On selector switch
is in wrong position
Auto Turn On selector switch
is in wrong position
Sensitivity incorrectly adjusted
Sensitivity level too high
Bad connection from surround
controller
Over-current protection circuitry
has been activated- one or both
blue channel LEDs not illuminated
A 51 has overheated - red Hi
Temp indicator is on
Damaged speaker
Problem with preamplifier
or source component
Balanced-Unbalanced Input
switch is in the incorrect position
Ground loop between surround
controller and A 51 or at the
equipment rack
Ground loop from cable TV
Other ground loop
Load impedance at speaker
terminals is too low
Not enough ventilation
Connect power cord
Check for correct position of the Auto
Turn On switch
Replace with same value fuse
Check polarity of DC source with a voltmeter.
Try connecting a 9V battery to the
12
V
DC input
Make sure Auto Turn On selector switch is
in its 12
V
position
Make sure Auto Turn On selector switch is
in its Audio position
Turn the Audio trigger Sensitivity knob
counterclockwise
Turn Sensitivity knob clockwise toward 250 mV
Check input connections or try a different
set of cables
Check speaker load impedance. Check speaker
wires and connections
Allow A 51 to cool. Check that there is adequate
ventilation around the A 51. Be sure the load
impedance of each channel is no less than 4 ohms
Connect each speaker to another channel on the
A 51. If the same speaker remains distorted, the
speaker or its wire is damaged. If the other speak-
er distorts, the problem may be with the A 51, the
surround controller, or a source component
Switch the input cables. If distortion moves
to another channel, the problem is with a
component other than the A 51
Move to the correct position for the jacks
in use
Move the Ground switch to its Lift position.
Install nylon shoulder washers on both sides
of the panels of all equipment to insulate metal
from touching the rack
Move the Ground switch to its Lift position.
Install a cable isolation device such as the
Xantech 634 Ground Breaker.
www.xantech.com
Contact Parasound Technical Service
Make sure the speaker or speaker selector
load is 4 ohms or higher
Make sure the A 51 has adequate ventilation
TROUBLE PROBABLE CAUSE REMEDY