Infinity 5760a Service Manual
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Infinity 5760a Service Manual

6 channel
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Reference Series
5760a
5761a

6 CHANNEL POWER AMPLIFIER

SERVICE MANUAL

Infinity Systems, Inc.
250 Crossways Park Dr.
Woodbury, New York 11797
Rev2aa10/2005

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Summary of Contents for Infinity 5760a

  • Page 1: Channel Power Amplifier

    Reference Series 5760a 5761a 6 CHANNEL POWER AMPLIFIER SERVICE MANUAL Infinity Systems, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Rev2aa10/2005...

  • Page 2: Table Of Contents

    (305mm x 470mm x 68mm) Fuse: 2 x 30A 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.

  • Page 3: Features/Test Conditions

    Reference 5760a/5761a Power Amplifier Features 4-Channel Operation • Advanced MOSFET Oversized Floating Rail Power Supply • Floating Ground Factory - Head - Unit Speaker - Level input • Variable lnput Sensitivity (250mV • Fully Complementary Output Stage with Class-A6 Voltage Amplification •...

  • Page 4: Controls/Connections

    HIGH-LEVEL INPUT CONNECTIONS within 18" of the battery terminal. Do not The 5760a/5761a amplifiers are install the fuse at this time. Route the wire to equipped with speaker-level inputs that allow the amplifier’s location, and connect it to the you to add an amplifier to head units that do amplifier’s positive (+12V) terminal.
  • Page 5 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.

  • Page 6: Installation

    LP: Allows bass to pass through to the speakers; should be selected when powering subwoofers. 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...
  • Page 7 REMOTE LEVEL CONTROL (OPTIONAL) All three Reference subwoofer amplifiers and 1. Initially turn the INPUT LEVEL control(s) to the 5760a/5761a amplifier have inputs for an optional minimum (counterclockwise). remote level control (100rc). This will allow the 2. Reconnect the (–) negative lead to the vehi- subwoofer level to be adjusted from the listening cle’s battery.

  • Page 8: Basic Troubleshooting

    Reference 5760a/5761a Power Amplifier ROUBLESHOOTING • PROBLEM: • PROBLEM: No audio (POWER LED is off). No audio (PROTECT LED is on). CAUSE and SOLUTION: CAUSE and SOLUTION: No voltage at BATT+ and/or REM terminals, or Voltage greater than 16V or less than 8.5V on bad or no ground connection.

  • Page 9: Typical System Wiring

    Reference 5760a/5761a...

  • Page 10: Exploded View/Parts List

    Reference 5760a/5761a...

  • Page 11: Mechanical Parts List

    Reference 5760a/5761a Power Amplifier Mechanical Parts List...

  • Page 12: Amplifier Block Diagram

    Reference 5760a/5761a Power Amplifier...

  • Page 13: Drawings

    Reference 5760a/5761a...
  • Page 14 Reference 5760a/5761a...
  • Page 15 Reference 5760a/5761a...
  • Page 16 Reference 5760a/5761a...

  • Page 17: Electrical Parts List

    Reference 5760a/5761a Electrical Parts List...
  • Page 18 Reference 5760a/5761a Electrical Parts List cont'd...
  • Page 19 Reference 5760a/5761a Electrical Parts List cont'd...
  • Page 20 Reference 5760a/5761a Electrical Parts List cont'd...
  • Page 21 Reference 5760a/5761a Reference 5761a Electrical Parts List Addendum The following chart below represents the only electrical parts differences in 5760a and 5761a models: MODEL PART NAME PART NUMBER SPEC DESIGNATOR REF 5760a RESISTOR RES-00-00415 1/5WF 12K OHM R171,271,371,471 REF 5761a...

  • Page 22: Ref 5761A Electrical Parts List Addendum Ic/Transistor Pinouts

    Reference 5760a/5761a...
  • Page 23 Reference 5760a/5761a Power Amplifier...
  • Page 24 Reference 5760a/5761a...

  • Page 25: Ref 5760A Schematics

    Reference 5760a...
  • Page 26 Reference 5760a...
  • Page 27 Reference 5760a...
  • Page 28 Reference 5760a...

  • Page 29: Ref 5761A Schematics

    DC C CDDCDD D CDDD Reference 5761a Power Amplifier PAGE 1...
  • Page 30 DC C CDDCDD D DDCDDD Power Amplifier Reference 5761a PAGE 2...
  • Page 31 DC C CDDCDD D DDCDDD Power Amplifier Reference 5761a PAGE 3...
  • Page 32 DC C CDDCDD D D CDDD Reference 5761a Power Amplifier PAGE 4...

  • Page 33: Packing

    Reference 5760a/5761a...

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