Code 3 RLS - Manual (Page 8)

8
NOTE: LEVEL 1, LEVEL 2, LEVEL 3, switch progressively. Switch position 1 provides +12 volts at
Level 1 terminal. Switch position 2 provides +12 volts at terminals 1 and 2. Switch position 3
provides +12 volts at terminals 1, 2, and 3.
SETUP AND ADJUSTMENT
All of the adjustments, except MAXIMUM P.A. ADJUSTMENT, and setup switches are
accessible from the rear of the unit. Make these adjustments and position the setup switches
prior to placing the unit inside their bail bracket (see wiring diagram, page 15).
Audio Adjustments
Radio Rebroadcast Adjustment - Place the selector switch in the RADIO position. The trimmer
located on the rear panel of the siren sets the maximum level RRB will reach with the knob fully
clockwise. To adjust properly, set the volume knob fully clockwise and adjust the trimmer such
that normal two-way radio volume inside the vehicle produces the desired volume outside the
vehicle.
Maximum P.A. Volume Adjustment - This trimmer ( located on the front panel next to the volume
control knob ) sets the maximum level that the P.A. volume will reach with the front panel VOLUME
control in the fully clockwise position. To adjust properly, set the front panel volume control fully
clockwise and adjust the trimmer while keying the microphone until the maximum volume out of the
speaker is such that there is no feedback and is
intelligible.
Remote Input - The remote input can be configured to
accept either a positive +12V or negative GND ( Earth )
signal for actuation. All 3990 series sirens are shipped
setup to accept the GND (Earth) signal present on most
vehicles from the vehicle horn switch. To reconfigure the
Remote Input to accept a +12V signal the amplifier cover
must be removed (see exploded view, page 20). Move
both jumpers towards the "+ " position. Refer to detail "A"
for a complete illustration.
4-Position DIP Switch (located on the siren amplifier, rear panel)
Gently set the SirenLock, and PKILL setup switches to the desired position using the point of a ball
point pin or some other similar tool. These switches are present on all models. If SirenLock is
switched on, all of the tones except AIRHORN, are muted until the Warning Light Switch is in either
the Level 3 or the Level 2 or 3 positions. Additionally, if the PKILL switch is on and the PKILL input
is connected to the vehicle's NSSW (Neutral Safety
Switch) circuit, all siren tones except AIRHORN are
muted while the vehicle is in PARK or NEUTRAL.
SirenLock - (sw 2-3) When switch 3 is on the siren
tones are allowed to sound when the 3-Level switch
is placed in the Level-3 position. When both switches
2 & 3 are on the siren tones are allowed to sound
when the 3-Level switch is placed in either
Level 2 or in Level 3 position.
Factory Setting
Figure 3, 4-Position DIP Switch