Infinity 7540a Service Manual Download Page 1

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Reference Series

7540a
7541a

4 CHANNEL POWER AMPLIFIER

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797

Rev

/2005

Summary of Contents for 7540a

Page 1: ...Reference Series 7540a 7541a 4 CHANNEL POWER AMPLIFIER SERVICE MANUAL Infinity Systems Inc 250 Crossways Park Dr Woodbury New York 11797 Rev3 10 2005...

Page 2: ...78W 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 inpu...

Page 3: ...Reference 7540a 7541a 2...

Page 4: ...e 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 o...

Page 5: ...inimum 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...

Page 6: ...ttery 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...

Page 7: ...g 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 conn...

Page 8: ...Reference 7540a 7541a 7...

Page 9: ...7 1 2 3 4 5 6 8 A B C D E Reference 7540a 7541a 8...

Page 10: ...Power Amplifier Reference 7540a 7541a 9...

Page 11: ...7540a 7541a BLOCK DIAGRAM Power Amplifier Reference 7540a 7541a 10...

Page 12: ...m R291 150 2W C16 47 25V J116 6m m Q432 C3198GR R191 150 2W Q281 C3198GR J90 12 5m m Q181 C3198GR C05 2200 25V WL Q144 A1023Y R62 4 7KF C421 68P J147 10m m R161 4 7 0 5W R450 120 Q134 C1027Y C241 2 2...

Page 13: ...60 J19 TH01 R22 R152 R42 R43 J20 R251 D54 Q02 Q11 Q12 J131 R447 D151 C142 Q21 R437 Q01 C461 Q33 R150 J126 R452 D04 Q23 J06 D451 J71 R62 C132 R52 C421 Q433 Q432 J103 R291 C241 J170 Q281 R191 Q181 J89 Q...

Page 14: ...Reference 7540a 7541a 13...

Page 15: ...Reference 7540a 7541a 14...

Page 16: ...R CARBON FILM 1 5WJ 1K OHM R31 42 52 92 107 127 128 131 135 141 36 R145 165 166 207 227 228 231 235 241 245 R265 266 307 331 335 341 345 365 366 407 R431 435 441 445 465 466 RES 00 00598 RESISTOR CARB...

Page 17: ...2 147 148 J149 208 209 210 215 223 224 226 227 JUP 00 00052 JUMPER 0OHM JUMPER 11m m J126 127 167 168 205 5 JUP 00 00046 JUMPER 0OHM JUMPER 12 5m m J44 45 46 47 48 49 50 71 72 81 23 J82 89 90 91 92 93...

Page 18: ...491 492 4 RES 08 00201 RESISTOR SMD 0805 1 10WJ 5 6K OHM R113 115 213 215 313 315 413 415 8 RES 08 00210 RESISTOR SMD 0805 1 10WJ 6 8K OHM R396 496 2 RES 08 00132 RESISTOR SMD 0805 1 10WJ 10K OHM R110...

Page 19: ...TOR RES 00 00417 1 5WF 13 7K OHM R171 271 371 471 2 REF 7541a RESISTOR RES 00 00508 1 5WF 33K OHM R171 271 371 471 REF 7540a RESISTOR RES 08 00225 SMD 0805 1 10WJ 820 OHM R108 208 308 408 3 REF 7541a...

Page 20: ...Reference 7540a 7541a 19...

Page 21: ...Reference 7540a 7541a 20...

Page 22: ...Reference 7540a 7541a 21...

Page 23: ...R41 220 0 5W Q23 A1266GR C04 2200 25 WL D04 1SS133 R60 10 5KF R42 1K R43 47 R53 47 R52 1K D03 1SS133 Q33 A1266GR R51 220 0 5W D01 1N5404 L03 CL 310 FH01 30Ax2 R46 47 T01 44PHI 4T 11T 8T 8T Q54 FQP50N0...

Page 24: ...Q151 C3200GR C151 100P D151 1SS133 R152 10K C161 104 M R161 4 7 0 5W R151 1 5K R171 13 7KF C171 100 16V R172 820F C291 220 16V D291 1N4744 15V R291 150 2W R160 0 1 3W Q135 TIP35C Q145 TIP36C Q144 A10...

Page 25: ...K R411 10K C405 22P VR302A 50KC C393 47P R465 1K C392 104 M TL U310 B 7 6 5 NJM2068LD U306 B 7 5 6 NJM2068M R396 6 8K R393 39K R466 1K REAR L VR302C 50KC REAR R R365 1K R397 150K R366 1K U310 A 1 3 2...

Page 26: ...R60 10 5KF R42 1K R43 47 R53 47 R52 1K D03 1SS133 Q33 A1266GR R51 220 0 5W D01 1N5404 L03 CL 310 FH01 30Ax2 R46 47 T01 44PHI 4T 11T 8T 8T Q54 FQP50N06 Q43 FQP50N06 Q21 C3198BL D41 YG225D2 D42 YG225D2...

Page 27: ...V R291 150 2W R160 0 1 3W Q135 TIP35C Q145 TIP36C Q144 A1023Y Q134 C1027Y R150 120 R136 47 R146 47 Q143 C3198GR R137 3 9K Q140 C3200GR Q133 A1266GR D191 1N4744 15V C191 220 16V R191 150 2W R135 1K R13...

Page 28: ...REAR L VR302C 50KC REAR R R365 1K R397 150K R366 1K U310 A 1 3 2 NJM2068LD C303 22 16V SRE R302 47KF R301 22KF VR303 B 20KB C304 10P R303 47KF C406 22P R311 10K VR302D 50KC R423 270K U301 A 1 2 3 NJM...

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