Also use high quality, 100% shielded, oxygen free copper
cables.
Trigger Connections
12VDC trigger used to remotely trigger a connected
device on and off. Please ensure that the total of the loads
connected to this trigger do not exceed 500mA.
Troubleshooting Guide
The Sherbourn PRE-1 is expertly designed and built to
provide years of trouble-free performance. Most problems
that occur can usually be solved by checking your
connections or making sure that the audio and video
components connected to the PRE-1 are on and fully
operational. The following information will help you deal
with common problems you may experience during initial
use of your unit. If problems persist, contact Sherbourn’s
service department for assistance.
No Sound (from one or more full range speakers)
•
Speaker cables may have come undone from the
amplifier. Turn off your system and check the speaker
cables, and tighten the binding posts.
•
Audio output cables that connect PRE-1 to the
amplifier(s) may not have a good connection. Turn off
your system and check all audio cable connections.
•
An audio cable may have an internal break. Switch
cable with a different channel to see if the problem
migrates to a different channel or stays in the affected
channel(s).
•
The correct input is not currently selected.
•
The mute switch is on.
•
The outputs on high pass and low pass channels may
be accidentally reversed. Check that the correct output
feeds the intended amplifier.
No Low Frequency (or poor output)
•
The powered subwoofer's amplifier is off or its input
level controls are set low.
•
Adjust the crossover on the subwoofer or PRE-1.
•
Adjust the physical location of your subwoofer.
Sound Drops Out with CD or DVD Playback
•
Make sure the disc is not dirty or scratched.
•
Some
inexpensive players and changers tend to
mistrack more often than you would like.
Remote Not Working
•
Make sure the AAA batteries are not dead or installed
incorrectly.
•
Make sure that the PRE-1 front panel receiver window
is not obstructed.
External Amplifier(s) Shut Down (Often or
Prematurely)
•
Make sure each speaker's average impedance is not
less than your amplifiers can safely handle.
•
The amplifier(s) have good ventilation, no vents are
covered.
•
Try using your left and right speakers with the High
Pass filter, allowing a more efficient use of the
amplifier's power.
•
Check that the amplifier(s) power output is a good
match for your speakers. If your speakers are
inefficient, consider using larger power amplifiers.
•
Make sure all wiring is correct and there are no shorts.
If wires have been run under carpet, under base boards
(or along tack strips) there is a possibility they can
easily be shorted by sharp edges or something that
punctures the insulation. Also, if your wiring is in the
walls - make sure that there was not an accidental
"staple" puncture from securing wiring to framing
studs or wall/floor joists. This evaluation is easily
done with an Ohm meter.
Remotely Connected External Amplifier(s) Do Not
Turn Off with PRE-1
Check the following:
•
Make sure the 1/8" plug is connected between PRE-1
trigger output and the amplifier(s) trigger input(s).
•
Make sure the total consumption of the connected
devices do not exceed 500mA
•
If you have spliced the plug to one or more amplifier
turn on inputs, remember the center pin is positive and
the outer shield is negative. This output is 12VDC.
"Hum" Noises
This problem is more than likely caused by a "ground
loop" in your system, rather than a fault in the PRE-1.
Follow these steps to isolate the main cause of the hum;
there may even be more than one. Remember to turn off
all components in your system (including the PRE-1)
before disconnecting or connecting any cables.
Disconnect the following items in order, and check each
time if the hum has gone away:
•
Disconnect all cables which come from outside the
room, such as cable TV, satellite TV, or roof top
antennas. Make sure that they are disconnected where
they first enter the room, so they are making no
connection to the PRE-1, the TV, or any other
component. If the hum is caused by the cable TV line,
you will need a "ground loop isolator." This is an
inexpensive device fitted in-line with the coaxial cable
feed. Contact your cable company or your Sherbourn
Dealer for assistance.
•
Disconnect any component which has a grounded
power cord.
•
If the hum persists, disconnect all the source
components one at a time from the back of the PRE-1
until you identify the problem. (Ground loop isolators
are available for audio lines and video. Ask Sherbourn
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