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Crown Audio 21100 Checklist, T r o u b l e s h o o t i n g, Problem, No output, Distorted sound

Models: 21100

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T r o u b l e s h o o t i n g

Checklist

Problem:	No output
Check:	Are the AC Present and Operate lights on?
	Are the Fault & Temp lights off?
	Are the Signal lights on?
	Are the level controls turned up?
	Are the speakers properly connected? (in particular check that older style ‘ring lock’ type
	Speakons are rotated in the socket).

Problem:	Distorted sound
Check:	Are the Clip lights on?
	Is any equipment before the amp being over driven?
	Are any speaker cables shorted?
	Are the loudspeakers too low an impedance?
	Are the input cables wired correctly?

Problem:	Hum or buzzing
Check:	Is the amp properly grounded?
	Are the input cables shielded?
	Are the input connectors properly wired?
	Are you using an unbalanced input?
	Does the noise stop if the equipment driving the amp is switched off?

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Crown Audio 21100 user manual Checklist, T r o u b l e s h o o t i n g, Problem, No output, Distorted sound, Hum or buzzing

Contents

Professional Power Amplifier C o n t e n t s S a f e t y I n f o r m a t i o n DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDEREFER SERVICING TO QUALIFIED SERVICE PERSONNEL Important Safety InstructionsI n t r o d u c t i o n & U n p a c k i n g IntroductionUnpacking M e c h a n i c a l I n s t a l l a t i o n Ground A C P o w e r C o n n e c t i o nWARNING! THIS APPLIANCE MUST BE GROUNDED NeutralInputs A u d i o C o n n e c t i o n sBridge mono operation OutputsStereo operation A u d i o C o n n e c t i o n s5 . 0C o n t r o l o p e r a t i o n a. Power Switch c. Bridge switchb. Level controls 1 and I n d i c a t o r s C. FaultE. Signal A. AC PresentI n d i c a t o r s F. Clip G. BridgeT y p i c a l a p p l i c a t i o n s a. Two channel stereo operationb. Two amplifiers used in bridge mode T y p i c a l a p p l i c a t i o n s c. Two amplifiers for stereo with a mono sub-bassd. Calculating Impedance take this further, four 8 ohm drivers = 2 ohms 8 & 8 =Amplitude G l o s s a r yActive BalancedFrequency dBu or dBvDistortion Frequency ResponseSpeakon Removable terminal blockTransient G l o s s a r yIndicators S p e c i f i c a t i o n sInput Connectors AC Present, Operate, Signal, Bridge, Clip, Temp., FaultProblem ChecklistT r o u b l e s h o o t i n g No outputPower light on, Operate light off, Fault light on not flashing Fault and both Temp lights flashingPower light on, Operate light off, Fault light on & flashing Power light on, Operate light on, Fault light on, Temp light onCrown Audio Customer Service Worldwide ServiceService Shipping Instructions S e r v i c e & W a r r a n t yWORLDWIDE EXCEPT USA & CANADA THREE YEAR FULL WARRANTYUNITED STATES & CANADA 3 YEAR133785-1 A division of Harman International IndustriesVersion 2.0 CB 050901 ZM10090-01 Crown Part Number Crown is a registered trademark of Crown International

T r o u b l e s h o o t i n g

Checklist

Problem:

No output

Distorted sound

Hum or buzzing