Intellitec MONOPLEX User manual

1485 Jacobs Rd.
Deland, FL 32724
386.738.7307
P/N 53-00571-100 Rev. B 032619
www.intellitec.com
Intellitec
SERVICE MANUAL
MONOPLEX SPEAKER SWITCH
Part No. 00-00571-000
The MONOPLEX Speaker Switch is intended to be used in conversion vehicles to switch the rear speakers
from a radio to the TV. This allows the TV sound to be brought out through the rear speakers. The module
is designed so it can work with an audio amplifier that has a control input that turns the amplifier on or off.
When the ignition is turned on, the rear speakers will be muted. The power to the amplifier will be turned
off. At the first press of the switch, the speakers will be connected to the radio inputs and the amplifier is
turned on.
The next press of the switch will connect the speakers in series and turn on the amplifier, bringing the TV
sound out of the rear speakers. The third press will mute sound. Then the process is repeated.
PRODUCT DESCRIPTION
1

1485 Jacobs Rd.
Deland, FL 32724
386.738.7307
P/N 53-00571-100 Rev. B 032619
www.intellitec.com
Intellitec
SERVICE MANUAL
MONOPLEX SPEAKER SWITCH
HOW IT WORKS
The MONOPLEX Speaker Switch provides a means of switching the two rear speakers to allow switching
between the four radio inputs and two TV inputs. The actual switching is done with relays. These relays
are controlled by the control electronics to provide the functions of the unit. When the unit is not powered,
the speakers are connected in series, but are not connected to any signal source. There is no amplifier
power. At the first press of a remote switch, (a short to ground on the MPX bus) relays K1, K2 and K4 are
pulled in, connecting the radio inputs to the speakers and providing power to the amplifier. At the next
press of the switch, relays K1 and K2 drop out and relay K3 pulls in, connecting the speakers in series to
the TV set. At the next press of the switch, relays K1, K2, K3, and K4 drop out , disconnecting the
speakers and removing power to the amplifier, to repeat the cycle.
Power for the control electronics is provided from the back lighting circuit. When this power is applied, the
system will come up in the mute mode.
The MONOPLEX SPEAKER SWITCH is a centralized audio switching center. Power from
both the ignition and battery is fed into the module. The power of the battery is available at this box.
Inadvertent shorts at this box could result in damage and/or injury.
Low current Test Light, Accurate Voltmeter (digital read-out preferred)
Note:
All servicing of this box should be done only by a qualified Service Technician.
Tools required:
2

1485 Jacobs Rd.
Deland, FL 32724
386.738.7307
P/N 53-00571-100 Rev. B 032619
www.intellitec.com
Intellitec
SERVICE MANUAL
MONOPLEX SPEAKER SWITCH
PLUGS - PINS & FUNCTIONS
J1 - 5 pin AMP Mate-N-Lok
J3 - 2 pin AMP Mate-N-Lok
J2 - 9 pin AMP Mate-N-Lok
Pin Function
Pin Function
Pin Function
1 Back Light/Power Input
2 +12 volt input
3 Amp power
4 MPX Switch bus
5 Ground
1 TV Ground
2 TV Sound
1 Radio Lt -
2 Speaker Lt -
3 Radio Rt -
4 Speaker Rt -
5 Speaker Lt +
6 Radio Lt +
7 Speaker Rt +
8 Radio Rt +
TROUBLE SHOOTING
Problem
Cause/Solution
No radio sound from rear speakers.
TV sound won't come from speakers.
Won't switch functions.
One channel not working.
Possible
Check for +12 volts coming to J1 - 1. If missing,
check fuse F10 on Master.
Check for power at amplifier. If missing, check fuse
supplying amplifier.
Check for radio fader settings. Set to middle of
range.
Check for +12 volts on J1 - 2. If missing, check
wiring.
TV sound not coming into J3. Check for sound
signal at J3.
Check voltage on Speaker Switch, J1 - 4. Should
be +12 volts, no button pressed, 0 volts with a
button pressed.
Unplug J2. Check for continuity between
corresponding inputs and outputs. If open, replace
module.
3

1485 Jacobs Rd.
Deland, FL 32724
386.738.7307
P/N 53-00571-100 Rev. B 032619
www.intellitec.com
Intellitec
SERVICE MANUAL
MONOPLEX SPEAKER SWITCH
4