Page 8 SA-400 Installation and Operating Instructions
9/6/01 CP4825A
SERVICE
This unit is designed to provide years of reliable service under even the worst condi-
tions. Many times there may appear to be a problem with the unit when the true prob-
lem is in the speaker(s) 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
SPKR leads and replace the fuse. If the siren emits a sound when in the Yelp posi-
tion it is OK. Check the speaker(s) or leads for possible shorting.
PROBLEMS
Symptom Possible Cause Check
No power Power switch not turned on
Connector loose
Internal fuse blown
Loose connection at power
source
Does backlighting come on?
Do you hear a "pop" when turned on?
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
Mic button stuck
The input voltage must be less than 16
volts.
Does mic button release properly?
No PA PA volume not set properly
Selector in Radio position
Have you tried turning the PA volume con-
trol?
PA is not available in the Radio position
Distorted
siren sound
Speaker assembly loose
Intermittent Aux Input con-
nection
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 9
volts.
Intermittent
siren tone
High Voltage Protection
Connector loose
Bad power connection
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?
Is there a loose connection on a power
lead?
Is something lying on the microphone?
Is a circuit breaker used with at least a
50A rating?
Horn function
Or Manual
stuck on
Siren switch stuck
Aux Input improperly con-
nected
Does the Siren switch return fully when
released?
Is the Aux Input used and wired properly?
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 turning the RAD volume
control?
Wrong siren
tone
Two-Tone option installed Is the T-T option switch turned on?
Phaser not
working
Phaser disabled Is the P_I option switch turned on?
Horn not
working
Horn disabled Is the H_I option switch turned on?
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