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Reference Series
6 CHANNEL POWER AMPLIFIER
5760a 5761a
SERVICE MANUAL
Infinity Systems, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Rev2aa10/2005
Power Amplifier
Reference 5760a/5761a
- CONTENTS SPECIFICATIONS ................................................1 FEATURES/TEST CONDITIONS.............................2 CONTROLS/CONNECTIONS...................................3 INSTALLATION......................................................5 BASIC TROUBLESHOOTING..................................7 TYPICAL SYSTEM WIRING....................................8 EXPLODED VIEW/PARTS LIST...............................9 MECHANICAL PARTS LIST..................................10 AMPLIFIER BLOCK DIAGRAM..............................11 P.C.B. DRAWINGS...............................................12 ELECTRICAL PARTS LIST .................................. 16
REF 5761a ELECTRICAL PARTS LIST ADDENDUM..........20
IC/TRANSISTOR PINOUTS............................... .....21 REF 5760a SCHEMATICS.....................................24 REF 5761a SCHEMATICS.....................................28 PACKING..........................................................32
Reference 5760a/5761a Specifications
Output Power: 56W RMS x 4 and107W RMS x 2 channels @ 4 ohms; 1% THD + N 80W RMS x 4 and150W RMS x 2 channels @ 2 ohms; 1% THD + N 148W RMS x 2 and 287W RMS x 1 channels @ 4 ohms; 1% THD + N 82dBA (reference 1W into 4 ohms) 117W channels 1,2,3,4; 163W channels 5,6 @ 2 ohms 6.373 @ 4 ohms 10Hz 57kHz channels 1,2,3,4; 10Hz 302Hz channels 5,6 6.3V Reference 5760a - 230mV Reference 5761a - 75mV <50mV (-50%) .063dB @ 4 ohms 2.1A 22k 34A @ 4 ohms 88A @ 2 ohms 89.5 @ 4 ohm bridged 12 x 18 1/2 x 2 11/16" (L x W x D) (305mm x 470mm x 68mm) 2 x 30A
Signal-to-noise ratio: Dynamic power: Effective damping factor: Frequency response: Maximum input signal: Maximum sensitivity: DC Offset Output regulation: Idle Current Input Impedance Max Current Draw
Dimensions: Fuse:
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.
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Power Amplifier
Reference 5760a/5761a
Features
· · · · · · · 4-Channel Operation Advanced MOSFET Oversized Floating Rail Power Supply Floating Ground Factory - Head - Unit Speaker - Level input Variable lnput Sensitivity (250mV - 6V) Fully Complementary Output Stage with Class-A6 Voltage Amplification Gold-plated Power, lnput and Output Connectors 2-Ohm Stable (Stereo)
Test Conditions and Notes
· All tests to be done, unless otherwise specified, from 10Hz to 47KHz and 302Hz at 14.4V DC into 4 ohm loads and adjust the units gain so that with a .775 volt input signal the unit is at Its maximum rated output. All measurements will be done using an Audio precision system one and the supply voltage. An A+ line voltage of 14.4V DC shall be applied to the unit under test for all measurements unless otherwise specified. The voltage applied to the unit shall be measured at the power connection on the Amplifier. Signal Source Unless otherwise specified, all tests shall be conducted with the Audio Signal Generator output configured to be balanced, less than or equal to 50 ohm source impedance, and floating. The signal source "GND" shall be connected to the Amplifier PWR GND at the Amplifier. Output Load Unless otherwise specified, all tests shall be conducted with 4 ohm resistive loads having less than 10% reactive components at any frequency below 47KHz and 302Hz. Each resistor shall have a value that remains within 1 % while dissipating the rated output of the unit under test. Power Indicator Green LED steadily illuminates for normal operation. Illuminates up Red LED blinks when protection circuitry is engaged, and during power up.
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Power Amplifier
Reference 5760a/5761a
POWER CONNECTIONS
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 Remote Turn-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 Model Current Draw 5760a/5761a 87A Minimum Wire Gauge #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 5760a/5761a 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.
HIGH LEVEL INPUT L + R + GRAY + GRAY/BLACK WHITE/BLACK + WHITE
Figure 1.Terminal-connection end plate.
R L Speaker Wires (spliced)
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Power Amplifier
Reference 5760a/5761a
APPLICATIONS 5760a/5761a
The amplifier can be configured for 6-channel, 5-channel or 3-channel operation, as shown in Figures 10 through 12. INPUT MODE SWITCH: · Use INT (internal mode) to send a signal from the front and rear inputs to the subwoofer. · Use EXT (external mode) when sending a dedicated signal to the subwoofer inputs; e.g., if your source unit has a subwoofer output. NOTE: For simplicity, Figures 10 through 12 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.
Figure 10. 6-Channel operation: 5760a/5761a amplifier driving full-range front and rear speakers and a pair of subwoofers.
Figure 11. 5-Channel operation: The same as Figure 10, with the subwoofer output bridged to drive a single 4-ohm subwoofer, providing the speaker with more power.
Figure 12. 3-Channel operation: 5760a/5761a amplifier configured for 3-channel operation, where all of the channels are bridged for a subwoofer and a pair of component speakers.
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Power Amplifier
Reference 5760a/5761a
INSTALLATION AND SETUP
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. 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.
NOTE: The subwoofer output of the 5760a/5761a is low-pass only and does not have a crossover-mode switch.
Figure 13. Control end panel.
5760a
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Power Amplifier
SETTING INPUT SENSITIVITY 1. Initially turn the INPUT LEVEL control(s) to minimum (counterclockwise). 2. Reconnect the () negative lead to the vehicle'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 7.
Reference 5760a/5761a
REMOTE LEVEL CONTROL (OPTIONAL) All three Reference subwoofer amplifiers and the 5760a/5761a amplifier 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 The5760a/5761a are all equipped with a bass-boost control. This allows you to enhance the bass output of your system at 50Hz up to 12dB.
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.
AUX OUTPUT Reference amplifiers 5760a/5761a 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.
Figure 13. Control end panel.
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Power Amplifier
Reference 5760a/5761a
TROUBLESHOOTING
· 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.
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Power Amplifier Mechanical Parts List
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Reference 5760a/5761a Electrical Parts List cont'd
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Reference 5761a Electrical Parts List Addendum
The following chart below represents the only electrical parts differences in 5760a and 5761a models:
MODEL 1 REF 5760a REF 5761a 2 REF 5760a REF 5761a 3 REF 5760a REF 5761a 4 REF 5760a REF 5761a 5 REF 5760a REF 5761a REF 5760a 6 REF 5761a PART NAME RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR POWER TERMINAL POWER TERMINAL SPEAKER TERMINAL SPEAKER TERMINAL PART NUMBER RES-00-00415 RES-00-00480 RES-00-00467 RES-00-00532 RES-08-00225 RES-08-00242 RES-08-00253 RES-08-00116 TER-00-00030 TER-00-00278 TER-00-00020 TER-00-00272 SPEC 1/5WF 12K OHM 1/5WF 27K OHM 1/5WF 22K OHM 1/5WF 43K OHM SMD 0805 1/10WJ 820 OHM SMD 0805 1/10WF 240 OHM SMD 0805 1/10WF 15.2KOHM SMD 0805 1/10WF 9.1KOHM (3P) TM006-01 (3P) DK-03B04-AG-5-UP (12P) WT-9512 (12P) DK-1201-AG-5-UP DESIGNATOR R171,271,371,471 R171,271,371,471 R571,671 R571,671 R108,208,308,408,508,608 R108,208,308,408,508,608 R155,255,355,455,555,655 R155,255,355,455,555,655 TER1 TER1 TER2 TER2
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CDDCDD D
CDDD
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Reference 5761a PAGE 1
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DDCDDD
Power Amplifier PAGE 2
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Power Amplifier PAGE 3
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Power Amplifier
Reference 5761a PAGE 4
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