Bedienungsanleitung JL Audio HD900 (Seite 11 von 13) (Englisch)

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20 | JL Audio - HD900/5 Owner’s Manual

“My amplifier shuts off once in a while, usually at higher volumes”

Check your voltage source and grounding point. The power supply

of the HD900/5 will operate with charging system voltages

down to 9V. Shutdown problems at higher volume levels

can occur when the charging system voltage drops below

9V. These dips can be of very short duration making them

extremely difficult to detect with a common DC voltmeter.

To ensure proper voltage, inspect all wiring and termination

points. It may also be necessary to upgrade the ground

wire connecting the battery to the vehicle’s chassis and the

power wire connecting the alternator to the battery. Many

vehicles employ small (10 AWG - 6 AWG) wire to ground the

battery to the vehicle’s chassis and to connect the alternator to

the battery. To prevent voltage drops, these wires should be

upgraded to 4 AWG when installing amplifier systems with

main fuse ratings above 60A. Grounding problems are the

leading cause of misdiagnosed amplifier “failures.”

“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 200mV 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 Connector Plugs

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 Speaker Connector

Plugs. The speaker wire connectors are designed to accept up

to 12 AWG wire. Make sure to strip the wire to allow for a

sufficient connection with the metal inside each terminal.

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

Please refer to Appendix C (pages 18, 19) to set the input sensitivity

for maximum, low-distortion output.

“My amplifier doesn’t turn on”

Check the fuse(s), 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.

“I get a distorted / attenuated sound coming out of the speaker(s)”

Check the speaker wires for a possible short, either between the

positive and negative leads or between either speaker lead and

the vehicle’s chassis ground. If a short is present, you

will experience distorted and/or attenuated output. The

“Status” LED will turn amber (yellow) in this situation. It may

be helpful to disconnect the speaker wires from the amplifier

and use a different set of wires connected to a test speaker.

Check the nominal load impedance to verify that each channel

of the amplifier is driving a load equal to or greater than

1.5 ohms in stereo mode (3 ohms bridged).

Check the input signal and input signal cables to make sure signal

is present at the “Amplifier Inputs” and the cables are not

pinched or loose. It may be helpful to try a different set of

cables and/or a different signal source to be sure.

Reset the amplifier by removing the power plug, then wait ten

seconds and reconnect the power plug.

“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 connector plugs.

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

contact with the input jacks on the amplifier.

APPENDIX D: TROUBLESHOOTING

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