Infinity 7540a Bedienungsanleitung

Reference Series

7540a

7541a

4 CHANNEL POWER AMPLIFIER

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 Rev310/2005

- CONTENTS -

SPECIFICATIONS ………………………………….……..1

FEATURES/TEST CONDITIONS……..…………………2

CONTROLS/CONNECTIONS………….……..…...…..…3

INSTALLATION………………….……...……..…...…...…5

BASIC TROUBLESHOOTING..…….…….………………6

TYPICAL SYSTEM WIRING..…….…….……………..…7

EXPLODED VIEW/PARTS LIST…….….….…………....8

MECHANICAL PARTS LIST……………..…………........9

AMPLIFIER BLOCK DIAGRAM…………………………10

P.C.B. DRAWINGS….…………………………………….11

ELECTRICAL PARTS LIST ……………………………. 15

REF 7541a ELECTRICAL PARTS LIST ADDENDUM….……18

IC/TRANSISTOR PINOUTS..………………………. …..19

REF 7540a SCHEMATICS……………………………....22

REF 7541a SCHEMATICS…………………………..…..25

PACKING……..……………………………………..…....28

Reference 7540a/7541a Specifications

Output Power: 111W RMS x 4 channels @ 4 ohms; ≤1% THD + N

(14.4V supply) 139W RMS x 4 channels @ 2 ohms; ≤1% THD + N

278W RMS x 2 channels @ 4 ohms; ≤1% THD + N

Signal-to-noise ratio: 81dBA (reference 1W into 4 ohms)

Dynamic power: 164W @ 2 ohms

Effective damping factor: 6.315 @ 4 ohms

Frequency response: 10Hz – 100kHz (–3dB)

Maximum input signal: 5.5V

Maximum sensitivity: Reference 7540a - 230mV

Reference 7541a - 75mV

DC Offset <50mV (-50%)

Output regulation: .088dB @ 4 ohms

Idle Current 1.2A

Input Impedance 22kΩ

Max Current Draw 54A @ 4 ohms

83A @ 2 ohms

Dimensions: 12 x 15 x 2 11/16” (L x W x D)

(305mm x 381mm x 68mm)

Fuses: 30A x 2

Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and details in

this and related JBL publications are therefore subject to change without notice.

Power Amplifier Reference 7540a/7541a

Reference 7540a/7541a

•

If the amplifier’s fuse must be replaced, use

only the same type and rating as that of the

original. Do not substitute another kind.

The Reference amplifiers are capable of

delivering high power levels, and require a

reliable connection to the vehicle’s electrical

system in order to perform optimally. See

Figure 1 for connection location. Please

adhere to the following instructions carefully.

GROUND CONNECTION

Connect the amplifier’s Ground (GND) terminal

to a solid point on the vehicle’s metal chassis,

as close to the amplifier as possible. Refer to the

chart below to determine minimum wire-gauge

size. Sand away any paint from this location; use

a star-type-lock washer to secure the connection.

POWER CONNECTION

Connect a wire (see chart at right for appropriate

gauge) directly to the vehicle’s positive battery

terminal, and install an appropriate fuse holder

within 18" of the battery terminal. Do not

install the fuse at this time. Route the wire to

the amplifier’s location, and connect it to the

amplifier’s positive (+12V) terminal. Be sure to

use appropriate grommets whenever routing

wires through the firewall or other sheet metal.

Failure to adequately protect the positive wire

from potential damage may result in a vehicle

fire. When you are done routing and connecting

this wire to the battery and to the amplifier,

you may install the fuse at the battery.The

fuse value should be selected based on total

amplifier-current draw; see chart at right.

REMOTE CONNECTION

Connect the amplifier’s Remote (REMOTE)

terminal to the source unit’s RemoteTurn-On

lead using a minimum of 18-gauge wire. If your

source unit does not have a remote turn-on

connection, connect the amplifier’s (REMOTE)

terminal to the vehicle’s accessory circuit.

WIRE-GAUGE CHART

Amplifier Maximum Minimum

Model Current Draw Wire Gauge

7520a 34A #8 AWG

7540a/7541a 85A #8 AWG

These recommendations assume 7' – 10' wire

runs. If your installation differs markedly, you

will need to adjust the wire gauge accordingly.

SPEAKER CONNECTIONS

Refer to the application guides on the pages

that follow. Speaker connections should be

made using a minimum of 16-gauge wire.

HIGH-LEVEL INPUT CONNECTIONS

The 7540a/7541a amplifiers are

equipped with speaker-level inputs that allow

you to add an amplifier to head units that do

not have RCA line outputs.The speaker outputs

for the source unit should be connected to the

amplifier using the supplied connector (square

four-wire plug). Remember to check for proper

polarity.

NOTE: When using the low-level or high-level

inputs, the AUX outputs can be used to pass a

full-range line-level signal to another amplifier.

Figure 2. Speaker-level connector.

POWER CONNECTIONS

Figure 1.Terminal-connection end plate.

HIGH LEVEL

INPUT

Speaker Wires

(spliced)

–

+ WHITE

– WHITE/BLACK

GRAY/BLACK –

GRAY +

Power Amplifier Reference 7540a/7541a

The 7540a/7541a can be set up for stereo 4-channel,

3-channel or bridged 2-channel operation, as

shown in Figures 7 through 9.

NOTE: For simplicity, Figures 7 through 9 do not

show power, remote and input connections.

NOTE: Minimum speaker impedance for

stereo operation is 2 ohms. Minimum speaker

impedance for bridged operation is 4 ohms.

NOTE: “Bass Boost” only affects rear channels.

APPLICATIONS – 7540a/7541a

Figure 7. 7540a/7541a amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers.

Figure 8. 7540a/7541a is set up for 3-channel operation to drive a set of full-range speakers and a subwoofer.

Figure 9. 7540a/7541a used in bridged 2-channel mode to drive a set of components or subwoofers.

Power Amplifier Reference 7540a/7541a

Initially set the crossover-frequency control

midway. While listening to music, adjust the

crossover for the least perceived distortion from

the speakers, allowing them to reproduce as

much bass as possible.

Systems using a separate subwoofer set the

crossover mode to HP (high pass) for your

full-range speakers. Adjust the crossover

frequency to limit bass, and provide increased

system volume with less distortion.

For subwoofers, choose the highest frequency

that removes vocal information from the sound

of the subwoofer.

If using the 7540a/7541a to drive a subwoofer(s),

set the crossover mode to LP (low pass).

SETTING THE CROSSOVER(S)

Determine your system plans and set the

crossover-mode switch accordingly. If your

system design does not include a subwoofer,

set the crossover mode to FLAT and skip to

“Setting Input Sensitivity.”

MODE SWITCH

Flat: Allows a full-range signal through to the

speakers; can be used with larger full-range

speakers such as 6" x 9"s.

HP: Allows a high-pass signal through to

the speakers; should be used with most

loudspeakers (can protect your full-range

speakers from being overdriven with low

frequencies, one cause of speaker damage).

LP: Allows bass to pass through to the speakers;

should be selected when powering subwoofers.

Figure 13. Control end panel.

SETTING INPUT SENSITIVITY

1. Initially turn the INPUT LEVEL control(s) to

minimum (counterclockwise).

2. Reconnect the (–) negative lead to the vehi-

cle’s battery. Apply power to the audio system

and play a dynamic music track.

3. On the source unit, increase the volume

control to 3/4 volume. Slowly increase the

INPUT LEVEL control(s) toward three o’clock

until you hear slight distortion in the music.

Then reduce the INPUT LEVEL slightly until

distortion is no longer heard.

NOTE: After the source unit is on, blue LEDs (on

the top panel) will light, indicating the amplifier

is on. If not, check the wiring, especially the

remote connection from the source unit. Also

refer to “Troubleshooting” on the page 6.

INSTALLATION AND SETUP

REMOTE LEVEL CONTROL (OPTIONAL)

All three Reference subwoofer amplifiers

have inputs for an optional

remote level control (100rc).This will allow the

subwoofer level to be adjusted from the listening

position. Connect the optional remote level

control using the RJ-11 jack on the side of the

amplifier. Install the control module in the front

of the vehicle within easy reach of the driver.

Both the underside of the dash and the center

console are suitable locations. Refer to the

mounting instructions accompanying the 100rc.

SETTING THE BASS BOOST

The 7540a/7541a are all equipped

with a bass-boost control.This allows you to

enhance the bass output of your system at

50Hz up to 12dB.

NOTE: Only rear channels of the 7540a/7541a are

affected by the bass boost control.

AUX OUTPUT

Reference amplifiers are equipped

with full-range outputs that can be used to

connect additional amplifiers.

NOTE: When using the low- or high-level inputs,

the AUX outputs can be used to pass a full-range

line-level signal to another amplifier.

Power Amplifier Reference 7540a/7541a

STATUS LEDs

Clip: Indicates the amplifier is being overdriven,

and your speakers may be in danger.This

should blink only on musical peaks, and not

be on constantly.

Power: Indicates the amplifier is on.

Protection: Refer to “Troubleshooting” for specific

indications.

Figure 15. LED status.

•

PROBLEM:

No audio (POWER LED is off).

CAUSE and SOLUTION:

No voltage at BATT+ and/or REM terminals, or

bad or no ground connection. Check voltages

at amplifier terminals with VOM.

•

PROBLEM:

No audio (PROTECT LED flashes every

4 seconds).

CAUSE and SOLUTION:

DC voltage on amplifier output. Amplifier may

need service; see enclosed warranty card for

service information.

•

PROBLEM:

No audio (PROTECT LED is on).

CAUSE and SOLUTION:

Amplifier is overheated. Make sure amplifier

cooling is not blocked at mounting location;

verify that speaker-system impedance is within

specified limits.

•

PROBLEM:

No audio (PROTECT and POWER LEDs flash).

CAUSE and SOLUTION:

Voltage less than 9V on BATT+ connection.

Check vehicle charging system.

•

PROBLEM:

No audio (PROTECT LED is on).

CAUSE and SOLUTION:

Voltage greater than 16V or less than 8.5V on

BATT+ connection. Check vehicle charging

system.

•

PROBLEM:

Distorted audio.

CAUSE and SOLUTION:

Input sensitivity is not set properly, or amplifier

or source unit is defective. Check INPUT LEVEL

setting, or check speaker wires for shorts or

grounds.

•

PROBLEM:

Distorted audio (PROTECT LED flashes).

CAUSE and SOLUTION:

Short circuit in speaker or wire. Remove

speaker leads one at a time to locate shorted

speaker or wire, then repair.

•

PROBLEM:

Music lacks “punch.”

CAUSE and SOLUTION:

Speakers are not connected properly. Check

speaker connections for proper polarity.

TROUBLESHOOTING

Power Amplifier Reference 7540a/7541a

Reference 7540a/7541a

71 2 3 4 5 6 8

Reference 7540a/7541a

Power Amplifier Reference 7540a/7541a

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