crescendo BASS CLEF series Інструкція з експлуатації - Сторінка 7
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Troubleshooting
Assure that the Power LED is on, if so please proceed with step # 3, if not, continue with the steps below;
1. Check the in line fuse (s) on the battery's positive cable, and replace if needed.
2. Assure that the Ground is properly attached to the vehicle chassis on a clean metal point, tighten or
grind the connection point once again.
3. The amplifiers have high voltage protection. Make sure that the operating voltage is between 8.5V~
18V and voltages above this range will cause the amplifier to go into protect.
Protect LED is on
1. The Protect LEDS will light up under the possible circumstances;
a) The impedance connected is lower than specified rating.
b) Thermal PT can be activated if the impedance is lower than specified rating or if the supplied
voltage is insufficient.
c) Short circuitry, voltage and DC offset.
For short circuitry, check all cables including speaker wires, GND, battery's positive cable.
For voltage, please check step # 3, for DC offset, make sure that voltage of no more than 4V is
available. Remove the RCA from the input and check if the amplifier is released from protection.
If so, check if the output from the Head unit has a DC of 4V and replace / repair if needed.
Audio output (no sound)
1. Assure that RCA connections from the Head unit and the amplifier are properly connected.
Check the entire cables for damages. Test the RCA inputs for DC volts with the source unit on, and
replace / repair if needed.
2. Check the routing of the cables, fuses and verify that all connections are connected properly.
3. Check if the speakers are functioning properly.
Turn on Thump
1. Disconnect the signal input to the amplifier, then turn it on and off.
a) If the noise is cancelled, then connect a delay turn on module on the REM wire running from
the source unit to the amplifier.
b) Use another 12V source for REM lead to the amplifier. If the noise is cancelled, use a relay
to isolate the amplifier from the turn on thump.
Poor bass response
1. Check that the polarity of the speaker cables are correct. Speakers connected in anti-phase will
cancel out each other, thus the bass response will be absent.
Engine noise
1. Ensure that all signal transferring wires (RCA, speaker cables etc) are kept well isolated from
power and ground wires.
2. Bypass all electrical components between the Head unit and the amplifier.
Connect the Head unit directly to the amplifier's input. If the noise is eliminated, the unit bypassed
is the one creating the noise.
3. Remove the existing ground wires for all electrical components installed. Ensure that the ground point
is 100% metal which has been grinded and free of rust, paint, impurities etc.
4. Replace the ground cable of OEM battery / alternator and ensure it is grounded properly.
5. Test the battery and alternator load.
Ensure that the vehichle's electrical system is in a good condition including distributor,
spark plugs / wires, voltage regulators etc.
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