-12-
Speaker Diagnostics
There is a diagnostic LED shaped like a speaker located in the upper right hand
corner of the front panel. This LED will only turn on while a tone is trying to be
generated. It can be used to help identify the siren/speaker status.
Steady
- Speaker is connected and operating properly.
Single Flash
- Standby Mode
Double Flash
- Short/Over Current
Triple Flash
- Park-Kill Activated
Quad Flash
- Improper Voltage (too high or low)
Off
- No speaker is connected, or
- The siren is Off, or
- The speaker or wire connection has come loose or is electrically
open
Troubleshooting
Symptom
Possible Cause
Check
No power
Connector loose
Siren 20A fuse blown
Loose connection at power source
Check connector
Is power hooked up backwards? Positive ground vehicle?
Is an external fuse or circuit breaker used?
Are the negative leads connected to a good ground?
No siren tone - PA
works
No siren tone - No
sound
High voltage protection
Low voltage protection
Microphone button stuck
Park Kill polarity option set wrong
Park Kill activated
Bad speaker or speaker wiring
The input voltage must be less than 16 volts for LCS771 or less
that 34 volts for LCS771-28.
The input must be greater than 10V (LCS771) or
19V (LCS771-28) with the siren turned on.
Does microphone button release properly?
Is the PK jumper option properly configured?
Does the siren work when Park Kill input is disconnected?
Check for a short.
Check for an open.
No PA
PA volume not set properly
Have you tried turning the PA volume control?
Distorted siren sound
Speaker assembly loose
Intermittent Aux. Input connection
Low or high vehicle voltage
Is the speaker bell or tip loose?
Is the Aux. Input connected properly to horn relay?
Input voltage must be between 10-16 volts (LCS771) or
19-30volts (LCS771-28) while siren is on and drawing full
current.
Intermittent siren tone High voltage protection
Low voltage protection
Microphone button activation
Circuit breaker in supply connection
Shorted speaker or speaker wire
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? The input must be greater than
10V (LCS771) or 19V (LCS771-28) with the siren on and
drawing full current.
Is something lying on the microphone?
Is a circuit breaker used with at least a 50A rating?
Does the speaker have water damage, or is a wire pinched?
Horn function or
Manual or Phaser stuck
on
Manual or Horn push buttons stuck
Aux. Input improperly connected
Aux. Input Polarity Option set wrong
Does the switch return fully when released?
Is the Aux. Input used and wired properly?
Is the AUX polarity jumper option properly configured?
No Radio
Unit not connected to radio
Radio volume too low
Is the radio connected properly to the unit?
Can you hear the radio in the vehicle?
Adjust the Radio volume control
Wrong siren tone
Siren tones programmed incorrectly?
Re-program tones/Use System Reset (page 7-8)
Rocker Switch not
functioning
No power through switches
Check the wiring connections and verify voltage on the rocker
switch input
and
output wires (bundled)
Slide Switch not
functioning
No power through switch
Check the wire connections and verify voltage at the slide switch
input
and
output terminals
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) or improper installation. The following chart shows
typical symptoms and possible causes.
