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Level Controls
Each channel has its own rear mounted "set and forget" input level control. Your amplifier sounds best
with these level controls set to maximum, where they are effectively out of the audio signal path.
However, if your preamplifier has very high gain, and its volume control cannot track properly for left-
right channel balance near its minimum position, it may be necessary to reduce the input level control
settings on the amplifier. When using the HCA-1205A in a THX installation, each level control must be
set at maximum to correspond to 0 dB THX reference level.
Maintaining Your Parasound Amplifier
Your Parasound power amplifier requires no periodic maintenance and has no user serviceable parts
inside. To avoid the risk of electric shock, do not remove the top cover. The amplifier's exterior can easily
be cleaned with a soft cloth moistened only with a few drops of water or glass cleaner.
Main Power Fuse
There is an external fuse located within the AC receptacle that may blow as a result of an internal fault
condition. This fuse protects the unit from possible damage to internal parts. Never replace this fuse with
a fuse of higher value than installed from the factory. Substitution of a larger fuse may create serious stress
and damage to internal parts and will void your warranty.
In Case of Trouble
If you suspect a problem with your amplifier, first turn the amp off and check all your connections. The
trouble may be caused by another component or even a defective hookup cable. If you are hearing hum
out of any of your speakers, turn off the amplifier and disconnect the inputs to it. If the hum goes away,
it was probably be caused by your processor or one of the source components connected to it.
Frequently, hum in home theater systems is caused by a grounding problem with the cable TV system.
Contact your cable provider if necessary to make sure the cable feed into your house is properly grounded.
There are cable isolation devices available such as the Video Link #634 or the Mondial Magic specifically
designed to cure this problem. In rack mounted systems, ground loops and hum can sometimes develop
via the metal rack rails of the equipment rack. This problem can be solved with nylon shoulder washers
mentioned in the rack mounting section of this manual.
If All Else Fails...
Call your Parasound dealer or Parasound Technical Service. We can suggest other diagnostic tests you
can easily perform. If we determine that your amplifier should be returned to Parasound or an Authorized
Parasound Warranty Center for inspection and possible servicing, call Parasound for the location of a
warranty center near you. If you choose to send it to Parasound, contact us to obtain a Return
Authorization (RA) number. You will be asked to repack the unit in its original packaging including the
additional outer box for protection during transit. The Return Authorization number must be clearly
marked on the outer carton only. You should ship the unit by UPS with adequate insurance and a copy
of your purchase receipt to validate your ownership. Units that arrive without your specific Return
Authorization number, without a suitable shipping carton or with evidence of improper internal packing
must be refused. We do not accept collect shipments. After repair under warranty, the unit will be returned
to you via prepaid UPS. In the case of a non-warranty repair, contact us and we will advise you of the repair
charges before you ship the unit to us. The same packing and RA number requirements apply.