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Page 10 of 12 Installation and Operating Instructions SC-411RD-10
7/30/12 CP5094C
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 siren fuse doesn't necessarily mean that the unit is bad. If a speaker or speaker lead is shorted the
internal fuse will blow before the unit is damaged. Disconnect the speaker leads and replace the fuse. If the
OUT/DIM light comes on with power on and Yelp selected it is OK. Check the speaker(s) or leads for possible
shorting.
PROBLEMS
PARTS
The following parts are available from Carson Manufacturing Company, Inc.:
Symptom Possible Cause Check
No power or siren
output
No power to POWER input
Bad speaker
Connector(s) loose
Amplifier fuse blown
Loose connection at power source
Does backlighting come on?
Do you hear a "pop" when turned on?
With siren on and Yelp selected, listen for tone in amplifier.
Is an external fuse or circuit breaker used?
Are the negative leads connected to a good ground?
No siren tone - PA
works
High Voltage Protection
Microphone button stuck
Cutout activated
Cutout Polarity set wrong
Input voltage must be less than highest rated voltage.
Does microphone button release properly?
Does the siren work when CUTOUT input is disconnected?
Is the Cutout Input option properly configured?
No PA PA volume not set properly Have you tried adjusting the PA volume control?
Distorted siren
sound
Speaker assembly loose
Intermittent SIRCTRL Input connection
Low vehicle voltage
Is the speaker bell or tip loose?
Is the SIRCTRL Input used and wired properly?
Input voltage must be greater than lowest rated voltage.
Intermittent siren
tone
High Voltage Protection
Connector loose
Bad power connection
Microphone button activation
Circuit breaker in supply connection
Is the vehicle voltage regulator working properly?
Is the connector tight on the back of the unit?
Is there a loose connection on a power lead?
Is something lying on the microphone?
Are circuit breakers used with at least a 50A rating?
Horn function stuck
on or
Manual stuck on
Horn or Manual switch stuck
SIRCTRL Input improperly connected
SIRCTRL Input Polarity Option set wrong
Does the horn or manual switch return when released?
Is the SIRCTRL Input used and wired properly?
Is the Siren Control option properly configured?
No Radio Unit not connected to radio
Radio volume too low
Is the radio connected properly to the unit?
Can you here the radio in the vehicle?
Have you tried adjusting the radio volume control (amplifier)?
Wrong siren tone Two-Tone option installed
Aux Input set to wrong function
Is the Two-Tone option selected?
Is the Sweep/Intersection option selected?
Phaser or Horn not
working
Tone disabled Is Phaser/Two-Tone Enable option selected?
Is the Horn Enable option selected?
Automatic Siren not
working
Automatic Siren disabled Is the Automatic Siren Enable option selected properly?
Lever switch not
working at all
No power to lever switch
No ground at siren connector
Do the lever switch indicators light?
Does the siren work?
Lever switch not
working in some
positions
Loose lever switch output connection Does the lever switch indicator work in those positions?
Is the corresponding fuse blown?
Aux control switch
not working
No power to aux switches
Loose aux switch output connection
Do the aux switch indicators light?
Is the corresponding fuse blown?
Part Description
ED1943 Kit, Control Head Mounting (2-brackets, screws and lockwashers)
ED1944 Kit, Lever Switch Replacement (Includes mounting screws & CP4960 knob)
CP4688-12 Connector, 12-Pin Removable Terminal Block
CP5086-03 Connector, 3-Pin Removable Terminal Block
CP5090-25-BK Cable, CAT5e 25ft Black
CP4990-150 Fuse, ATM 15 Amp Automotive Mini
CP4990-250 Fuse, ATM 25 Amp Automotive Mini
CP4960 Knob, Black Lever Switch
CP4852 Knob, Black Rotary Switch
CP4895 Label, Aux Output Legends
CP4750 Microphone, Noise Canceling w/Connector
CP3633 Microphone Bracket with mounting screws
SR-15-1 Microphone Strain Relief
CP4119 Transistor, Output (2 required) (Industry Standard TIP36C, must have metal tab)
CP5094 Manual, SC-411RD-10 Installation and Operating
CP4688-10 Connector, 10-Pin Removable Terminal Block