Macrom 42.29 Manual De Instrucciones página 8

8 • PRE-OUTPUT RCA OUTPUT CONNECTORS: connect to an additional amplifier to be
used according to the mode previously selected.
9 • SPEAKER CONNECTOR: outputs for speakers connection. The amplifier allows to
connect speakers with minimum 1-ohm impedance per channel in stereo configuration and
with minimum 2-ohm impedance in mono-bridged configuration. Should the 3-channel
configuration be used, total impedance must not exceed the minimum 2-ohm value.
Be sure to keep the right polarity and phase in connecting the speakers. Avoid any contact
between poorly insulated wires and the car's ground or metal pieces and between the wires
themselves.
BRIDGED
+
L R
+ +
3-channel configuration
10 • FUSE: in case of fuse replacement make sure to use fuses of the same amperage. The
use of fuses with the wrong amperage may seriously damage the components of the unit.
11 • BAT + CONNECTOR: to be connected directly to battery + by means of a fuse located
close to the battery itself. Utilize a cable having an adequate section. Do not connect this
cable to the car's electrical system wiring (eg.: dome-light circuit, car radio etc.)
12 • GND CONNECTOR: connect the ground terminal to a clean base metal part of the
vehicle chassis (if possibile, to an existing screw). Utilize a cable having an adequate section.
13 • REMOTE-ON CONNECTOR: to be connected either to the remote switch-on output lead
or to the output lead of the power antenna coming from the head unit. As a resul, the 42.29 will
be switched on and off simultaneously with the head unit.
14 • CHECK CONTROL LED: this led shows the amplifier's status of operation:
WHITE: the unit is off
GREEN: the unit is working OK
RED: the unit has entered the protection mode
The 42.29 is equipped with three different protection devices:
Overheating: in case of wrong installation the unit enters the protection mode before being
damaged. As soon as the temperature returns to normal values, the unit resumes normal
operation.
Overload: if several speakers are connected to the amplifier and the total impedance
decreases below the allowable threshold (0.5 - 1 ohm), the amplifier enters automatically the
protection mode to avoid any damage. To restore normal operation the head unit has to be
switched off and then on again.
Output short circuit: in case of a short circuit at the speakers outputs, the unit enters the
protection mode to avoid serious damage to the end stage transistors. Normal operation is
restored by eliminating the short circuit and by switching on the head unit again.
CONTROLS AND INDICATORS
BRIDGED
+
L
+
2-channel configuration
8
R
+
BRIDGED
+
L R
+ +
1-channel configuration