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TB0348A Page 6 of 7 07/12/05
SERVICE
This unit is designed to provide years of reliable service under even the worst conditions. Many times there may
appear to be a problem with the unit when the true problem is in the speaker or improper installation. The following
chart shows typical symptoms and possible causes.
A blown rear panel fuse doesn't necessarily mean that the unit is bad. If a speaker or speaker lead is shorted this fuse
will blow before the unit is damaged. Disconnect the speaker leads and replace the fuse. If the siren emits a sound
when in the Yelp position it is OK. Check the speaker or leads for possible shorting.
PROBLEMS
Symptom Possible Cause Check
No Power or siren output Power switch not turned on
Bad Speaker
Connector or connections loose
Rear panel fuse blown
Loose connection at power source
Does backlighting come on?
Do you hear a “pop” when turned on?
With siren on, yelp selected, listen for tone in
amplifier.
Is an external fuse or circuit breaker used?
Are the power leads connected to a good buss?
No siren tone –
PA works
High Voltage Protection
Mic Button stuck
The input voltage must be less than 16VDC.
Does Mic Button release properly?
No PA PA volume not set properly
Function switch in Radio
Try turning the PA volume control.
PA is not available in Radio position.
Distorted siren sound Intermittent Aux Input connection
Low voltage
Is the Aux Input used and wired properly?
The input voltage must be greater than 10VDC.
Intermittent siren tone High Voltage Protection
Connector loose
Loose connection at power source
Mic Button activation
Circuit breaker in supply
connection
Is the battery voltage staying below 16VDC?
Is the connector tight on the back of the unit?
Check for loose leads back to power source.
Is something lying on the microphone?
Is a circuit breaker used with at least 50A rating?
Horn or manual stuck on Siren switch stuck
Aux Input improperly connected
Does the Siren pushbutton switch return fully when
released?
Is the Aux Input used and wired properly?
No Radio Unit not connected to a radio
Radio volume too low
Is the radio connected properly to the unit?
Can you hear the radio on its own speakers?
Try adjusting the internal radio volume control.
RETURN
If you have any questions concerning this or any other Carson product, please contact our Technical Service
Department at (888) 577-6877. Many issues can be handled over the phone. We can also be reached via e-mail at
service@carsonsirens.com
If a product must be returned for any reason, please contact our Technical Service Department to obtain a Returned
Merchandise Authorization number (RMA#) before you ship the product to Carson. Please write the RMA# clearly on
the package near the mailing label. Be sure to provide a return address, contact and phone number, along with a brief
description of the problem.