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TB0352A Page 7 of 8 09/27/05
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(s), controlled devices, or improper
installation. The following chart shows typical symptoms and possible causes.
A blown internal 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 SPKR leads and replace the fuse. If the unit itself emits a low
level sound when in the Yelp position it is OK. Check the speaker(s) 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
Internal siren 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
Cutout activated
Cutout Polarity Option set wrong
The input voltage must be less than highest rating.
Does mic button release properly?
Does siren work when Cutout input is disconnected?
Is the CUT P option properly configured?
No PA PA volume not set properly
Selector in Radio position
Try turning the PA volume control.
PA is not available in the Radio position.
Distorted siren sound Speaker assembly loose
Intermittent Aux Input connection
Low vehicle voltage
Is the speaker bell or tip loose?
Is the Aux Input used and wired properly?
The input voltage must be greater than lowest rating.
Intermittent siren tone High Voltage Protection
Connector or connections loose
Loose connection at power source
Mic button activation
Circuit breaker in supply
connection
Is the vehicle voltage regulator working properly?
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 or
Phaser stuck on
Horn switch stuck
Man/Phsr switch stuck
Aux Input improperly connected
Aux Input Polarity Option set
wrong
Does the Horn switch return fully when released?
Does the Man/Phsr switch return fully when released?
Is the Aux Input used and wired properly?
Is the AUX P option properly configured?
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 in the vehicle?
Try turning the RAD volume control.
Wrong siren tone Two-Tone option installed.
Aux Input set to wrong function
Is the T-T option jumper cut?
Is the AUX I option jumper configured properly?
Phaser not working Phaser disabled Is the PHSR option jumper cut?
Horn not working Horn disabled Is the trace cut that disables the Horn switch?
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.