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Troubleshooting guide – Parasound A 52 User Manual

Page 14

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TROUBLESHOOTING GUIDE

12

No power

Auto turn on doesn’t
function with a trigger
voltage

Auto turn on doesn’t
function with an audio
input signal

A 52 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 52 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 more
blue channel LEDs not illuminated

A 52 has overheated - red Hi
Temp
indicator is on

Damaged speaker

Problem with surround controller
or source component

Balanced-Unbalanced Input
switch is in the incorrect position

Ground loop between surround
controller and A 52 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 to a live AC outlet

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 52 to cool. Check that there is adequate
ventilation around the A 52. Be sure the load
impedance of each channel is no less than 4 ohms

Connect each speaker to another channel on the
A 52. 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 52, 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 52

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 52 has adequate ventilation

TROUBLE

PROBABLE CAUSE

REMEDY