Bedienungsanleitung JL Audio J2 1000 (Seite 8 von 11) (Englisch)

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14 JL Audio

“My amplifier turns on, but there is no output”

Check the input signal using an AC voltmeter to measure the

voltage from the source unit while an appropriate test tone is

played through the source unit (disconnect the input cables

from the amplifier prior to this test). The frequency used

should be in the range that is to be amplified by the amplifier

(example: 50 Hz for a sub bass application or 1 kHz for a full

range / high-pass application). A steady, sufficient voltage

(between 0.2 and 8.0-volts) should be present at the output of

the signal cables.

Check the output of the amplifier. Using the procedure explained in

the previous check item (after plugging the input cables back

into the amplifier) test for output at the speaker outputs of

the amplifier. Unless you enjoy test tones at high levels, it is

a good idea to remove the speaker wires from the amplifier

while doing this. Turn the volume up approximately half

way. 5V or more should be measured at the speaker outputs.

This output level can vary greatly between amplifiers but it

should not be in the millivolt range with the source unit at

half volume. If you are reading sufficient voltage, check your

speaker connections as explained below.

Check to ensure that the speaker wires are making a good

connection with the metal inside the terminal block. The

speaker wire connectors are designed to accept up to 8 AWG

wire. Make sure to strip the wire to allow for a sufficient

connection with the metal inside the terminal block.

“How do I properly set the input sensitivity on my amplifier”

Please refer to Appendix A (page 12) to set the input sensitivity for

maximum, low-distortion output.

“My amplifier doesn’t turn on”

Check the fuse, not just visually, but with a continuity meter. It is

possible for a fuse to have poor internal connections that

cannot be found by visual inspection. It is best to take the

fuse out of the holder for testing. If no problem is found with

the fuse, inspect the fuse-holder.

Check the integrity of the connections made to each of the

“+12VDC”, “Ground”, and “Remote” terminals. Ensure

that no wire insulation is pinched by the terminal set screw

and that each connection is tight.

Check to make sure there is +12V at the “Remote” connection of the

amplifier. In some cases, the turn-on lead from the source unit

is insufficient to turn on multiple devices and the use of a relay

is required. To test for this problem, jump the “+12VDC” wire

to the “Remote” terminal to see if the amplifier turns on. If this

does not work, proceed to the next step.

“My amplifier’s output fluctuates when I tap on it or hit a bump”

Check the connections to the amplifier. Make sure that the

insulation for all wires has been stripped back far enough to

allow a good contact area inside the terminal block.

Check the input connectors to ensure that they all are making good

contact with the input jacks on the amplifier.

APPENDIX C: TROUBLESHOOTING

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