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Summary of Contents for Infinity 7540a
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Page 1: Channel Power Amplifier
Reference Series 7540a 7541a 4 CHANNEL POWER AMPLIFIER SERVICE MANUAL Infinity Systems, Inc. 250 Crossways Park Dr. 10/2005 Woodbury, New York 11797 Rev3... -
Page 2: Table Of Contents
(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. -
Page 3: Features/Test Conditions
Reference 7540a/7541a... -
Page 4: Controls/Connections
HIGH-LEVEL INPUT CONNECTIONS within 18" of the battery terminal. Do not The 7540a/7541a 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 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.
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Page 6: Installation
If using the 7540a/7541a to drive a subwoofer(s), LP: Allows bass to pass through to the speakers; set the crossover mode to LP (low pass). -
Page 7: Basic Troubleshooting
Reference 7540a/7541a 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 8: Typical System Wiring
Reference 7540a/7541a... -
Page 9: Exploded View/Parts List
Reference 7540a/7541a... -
Page 10: Mechanical Parts List
Reference 7540a/7541a Power Amplifier... -
Page 11: Amplifier Block Diagram
Reference 7540a/7541a Power Amplifier 7540a/7541a BLOCK DIAGRAM... -
Page 12: Drawings
Reference 7540a/7541a WT-9519 TM0006-01 7.5m/m TER02 7.5m/m WF-9604 7.5m/m L/CH 7.5m/m R/CH FH01 105(M)"TL" BJ06 R262 35m/m 20m/m 680/2W 680/2W 1N5404 104(M) 4.7/0.5W R362 104P 17.5m/m C261 R261 680/2W 17.5m/m R462 C3198GR 4.7/0.5W 430K 104(M) 8.2K R461 Q90 C3198GR C361 4.7K... - Page 13 Reference 7540a/7541a...
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- Page 15 Reference 7540a/7541a...
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Page 16: Electrical Parts List
Reference 7540a/7541a Electrical Parts List TRS-00-00087 TRANSISTOR SMALL SIGNAL PNP KTA1023Y Q01,144,244,344,444 TRS-00-00088 TRANSISTOR SMALL SIGNAL NPN KTC1027Y Q134,234,334,434 TRS-00-00091 TRANSISTOR SMALL SIGNAL PNP KTA1268GR TRS-00-00111 TRANSISTOR SMALL SIGNAL NPN KTC3200GR Q151,251,351,451 TRS-00-00110 TRANSISTOR SMALL SIGNAL NPN KTC3198GR Q02,90,131,132,143,181,231,232,243,281 Q331,332,343,431,432,443... - Page 17 Reference 7540a/7541a Electrical Parts List cont'd ELC-00-00199 CAPACITOR ELECTROLYTIC "SMS" 100/16V C11,12,13,171,181,271,371,471 ELC-00-00200 CAPACITOR ELECTROLYTIC "SMS" 220/16V C191,291 ELC-00-00201 CAPACITOR ELECTROLYTIC "SMS" 330/16V C192,292 ELC-00-00250 CAPACITOR ELECTROLYTIC "SRE" 4.7/50V C128,228 ELC-00-00641 CAPACITOR ELECTROLYTIC "SRE" 22/16V C102,103,123,124,202,203,223,224,302,303 16 C323,324,402,403,423,424 MYC-00-00020 CAPACITOR...
- Page 18 Reference 7540a/7541a Electrical Parts List cont'd THS-00-00013 THERMISTOR NTC RESISTOR FTD5-350 TH01 ELC-00-00234 CAPACITOR ELECTROLYTIC "SMS" 470/50V (12.5x20m/m) C51,61 ELC-00-00727 CAPACITOR ELECTROLYTIC "WL" 2200/25V (16x25m/m) C04,05,06 ELC-00-00714 CAPACITOR ELECTROLYTIC "HC/DL" 4700/50V (25x30m/m) C52,62 COR-TF-00405 CORE 44PHI MAGNETICS T01 , 4(0.7x15):11(0.7x4):8(0.7x1):8(0.7x1)
- Page 19 Reference 7540a/7541a Reference 7541a Electrical Parts List Addendum The following chart below represents the only electrical parts differences in 7540a and 7541a models: MODEL PART NAME PART NUMBER SPEC DESIGNATOR REF 7540a RESISTOR RES-00-00586 1/5WF 820 OHM R172,272,372,472 REF 7541a...
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Page 20: Ic/Transistor Pinouts
Reference 7540a/7541a... - Page 21 Reference 7540a/7541a...
- Page 22 Reference 7540a/7541a...
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Page 23: Ref 7540A Schematics
B+SW 13.54V 13.61V FH01 14.4V A1023Y WF9604 CL-310 14.4V 30Ax2 10/0.5W 1N5404 105(M)"TL" 430K C800 10/16V 4.7K 1N4004 4.7K C3198GR 8.2K 4.44V 10.5KF FQP50N06 4.7KF 104P FR154 VCC2 4.7/50V FR154 FQP50N06 FR154 4.7/50V 5.06V FQP50N06 -28V FR154 VEE2 13.54V YG225D2 38.86V CL-510 473P... - Page 24 C126 C192 C191 R126 R125 330/16V 220/16V 10KF 10KF +15V R191 FRONT-R VCC2 150/2W R-OUT C128 R128 38.86V 4.7/50V"SRE" REAR-R RCA101-C D191 R131 C400 C200 +15V DJB-554A 1N4744(15V) R135 R136 104P 104P U111-A C131 R127 37.78V R132 Q133 NJM2068LD 2.2/50V R129 A1266GR 5.6K...
- Page 25 +15V 38.86V +15V R331 R335 R336 37.78V C331 R332 Q333 2.2/50V A1266GR R312 5.6K C305 Q331 Q334 Q332 C332 C3198GR 0.89V C1027Y 37.78V C3198GR 100P C302 R302 R305 C311 PROT Q335 22/16V"SRE" 47KF 47KF TIP35C Q351 C356 22P C3200GR R311 C313 C315 R369...
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Page 26: Ref 7541A Schematics
Reference 7541a Power Amplifier REF 7541a SCHEMATIC PAGE 1 B+SW FH01 A1023Y WF9604 CL-310 30Ax2 10/0.5W 1N5404 105(M)"TL" 430K C800 4.7K 10/16V 1N4004 4.7K C3198GR 8.2K 10.5KF FQP50N06 4.7KF 104P FR154 VCC2 4.7/50V FR154 FQP50N06 FR154 4.7/50V FQP50N06 FR154 VEE2 YG225D2 CL-510 473P... - Page 27 Reference 7541a Power Amplifier C126 REF 7541a SCHEMATIC PAGE 2 C192 C191 R126 R125 330/16V 220/16V +15V 10KF 10KF R191 FRONT-R VCC2 150/2W R-OUT C128 R128 4.7/50V"SRE" REAR-R RCA101-C D191 R131 C400 C200 +15V DJB-554A 1N4744(15V) R135 R136 104P 104P U111-A C131 R127...
- Page 28 Reference 7541a Power Amplifier REF 7541a SCHEMATIC PAGE 3 +15V +15V R331 R335 R336 C331 R332 Q333 2.2/50V A1266GR R312 5.6K C305 Q331 Q334 Q332 C332 C3198GR C1027Y C3198GR 100P C302 R302 R305 C311 PROT Q335 22/16V"SRE" 47KF 47KF TIP35C Q351 C356 22P C3200GR...
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