Cloud-electronics CX263 User Manual download pdf (Page 19)

12 Troubleshooting

12.1 Ground/Earth Loops

Despite your best efforts, if the completed sound system ‘hums’ you probably have a ‘ground

loop’; the offending signal source can be found by setting the volume control to minimum then

disconnecting the input leads (both left & right channels) on each line input until the ‘hum’

disappears. This problem is often caused by terminating a screened input cable into a signal

source positioned a significant distance from the CX263.

A good way of avoiding this potential problem is to use signal sources (CD players and the like)

that are double insulated with no connection to the mains supply earth. If a signal feed is

derived from a second device (a club or microphone mixer for example) it would be perfectly

normal to expect this to be earthed; we suggest that a transformer be used to isolate the signal

and prevent a noisy loop (see diagrams below)

12.2 Connecting balanced signals to unbalanced line

inputs

We recommend the use of a transformer to convert a balanced signal to an unbalanced signal

suitable for direct connection to the CX263 line inputs. The transformer should be mounted

close to the CX263 and the unbalanced output lead should be kept as short as possible. Where

both the source and destination units are earthed, it is important to isolate the primary and

secondary windings to avoid a potential ground loop; if there is any doubt about this, we

suggest that the balanced cable screen is not connected at the transformer end. RS

Components part 210-6447 is a suitable transformer for this application we recommend that the

screening can (part number 210-6469) also be fitted to the transformer; Canford Audio supplies

a similar transformer (part number OEP Z1604). All transformers should be wired to give a ratio

of 1:1.

CX263 Zone Mixer Installation and Setup Guide

CLOUD ELECTRONICS LIMITED

13 V2 100904

SINGLESCREEN

CABLE

SINGLESCREEN

CABLE

HOT

SCREEN

HOT

SCREEN

HOT

SCREEN

HOT

COLD

TWO-CORE

SCREENED

CABLE

(SCREENNOTCONNECTED

ATTHISEND)

HOT

COLD

TWO-CORE

SCREENED

CABLE

TWO-CORE

SCREENED

CABLE

(SCREENNOTCONNECTED

ATTHISEND)

SINGLESCREEN

CABLE

COLD

SCREEN

CONVERTINGUNBALANCED

TOBALANCEDUSINGA

1:1RATIOTRANSFORMER

CONVERTINGTWOPIECES

OFUNBALANCEDEQUIPMENT

USINGA1:1RATIOTRANSFORMER

CONNECTINGTWOPIECESOF

BALANCEDEQUIPMENTUSINGA

1:1RATIOTRANSFORMER

AUDIO TRANSFORMER

RS PART NUMBER: 210-6447

FITTED WITH SCREENING CAN

RS PART NUMBER: 210-6469

1 2 ... 14 15 16 17 18 19 20 21 22 23

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Cloud-electronics CX263 User Manual Page 19

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