dbx 223xs - Section 6: Troubleshooting; No Sound and Abnormal Audio Output; Hum, Buzz, and Intermittent Audio Issues

17
223s, 223xs,
234s, 234xs
Section 6
Troubleshooting
12
Section 6 - Troubleshooting
NO SOUND
If there appears to be no power:
 •CheckthateitherthestereoormonoLEDonthefrontpanelofthe234s/234xsor
223s/223xs is lit.
 •Checkthatthepowercordisseatedproperlyinthebackpanelofthecrossoverandthat
it is plugged into an active AC power source.
If there appears to be power, but no audible signal:
 •Confirmthatactiveaudiolinesareconnectedtothecrossover’sinputsandoutputs.
 •Checkthatboththeinputandoutputgaincontrolsareadvancedsufficiently.
 •Checktomakesurethatyouhaveturneduptheamplifiers’outputs.
ABNORMAL AUDIO OUTPUT
 •Ensurethatthepropermodeforyoursetuphasbeenselectedviatherearpanelmode
switches.
 •ChecktheLFSumswitch.
 •Checkthex10switch.Thischangestherangeofthecrossoverfrequencyfrom45-960
Hz to 450 Hz - 9.6 kHz.
HUM AND/OR BUZZ
If you suspect that the hum is caused by a ground loop:
 •Systematicallyremoveand/orconnecttheaudiogroundsofthedevicesinthesignal
path.
 •Remember,forsafetyyoumustmaintainconnectiontochassisground.Neverliftasafety
ground.
If you suspect the hum is not caused by a ground loop.
 •Checktheaudioatanearlierstageintheaudiochain.
 •Lowlevelequipmentshouldbemountedawayfrompoweramplifierstoavoidinduction
of this type of hum.
 •Becertainthatallaudiowiringexceptforloudspeakerlinesiswellshielded,andthat
low level wiring is not run parallel to and/or in close proximity to AC power wiring.
INTERMITTENT AUDIO
 •Checktheotherequipmentandthewiringtomakecertainthatthesignalisnot
intermittent earlier in the chain.
 •Checktheintegrityofallcablesusingacabletester.