Sherbourn PRE-1 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 12)

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.

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 in-

stalled incorrectly.

• Make sure that the PRE-1 front panel receiver win-

dow 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.

• Check that the amplifier(s) power output is a good

match for your speakers. If your speakers are inef-

ficient, 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 connect-

ed 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 an-

tennas. 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 ground-

ed power cord.

• If the hum persists, disconnect all the source compo-

nents 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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