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Infinity Kappa 255a Service Manual

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Kappa 255a
Automotive Amplifier
SERVICE MANUAL
Infinity Systems Incorporated
250 Crossways Park Dr.
Woodbury, New York 11797
Rev1 9/2001

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  • Page 1 Kappa 255a Automotive Amplifier SERVICE MANUAL Infinity Systems Incorporated 250 Crossways Park Dr. Woodbury, New York 11797 Rev1 9/2001...

  • Page 2: Table Of Contents

    - CONTENTS - SPECIFICATIONS ……..…………………………………………………………..2 FEATURES ..……………………………….……………….……………….…...…3 APPLICATIONS (SET-UP GUIDE) ………………..……..……………………….4 PRECAUTION AND NOTES..…..………………….….…………………………..6 INSTALLATION ….………..…………..…………….……………………………..7 TROUBLESHOOTING ….………..………………….……………………………..9 SERVICE BULLETIN #INF9701 ….…………...…………………..……………..10 SERVICE BULLETIN #INF2001-02 ….…………………………………………..11 PCB DRAWINGS ….………..……………………………………………………..13 BLOCK DIAGRAMS………...……………….……………….…………..….…….19 ELECTRICAL PARTS LIST ..……………….……………….…………..….…….21 SCHEMATICS …………..……………………..…….…….….………..………….29 REVISIONS ……………..……………………..…….…….….………..………….41 Occasional refinements may be made to existing products without notice but will always meet or exceed original specifications unless otherwise stated...

  • Page 3: Specifications

    All tests to be done from 20 to 20KHz at 14.4 VDC into 4 ohm loads, unless otherwise specified. Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and construction details in this and related Infinity publications are therefore subject to change without notice.

  • Page 4: Features

    FEATURES The Kappa 255a is a 5-channel power amplifier that offers full-range stereo and bridged-mono operation on four analog channels and band-limited mono operation on a class-D channel for subwoofer applications. The front/rear amplifiers are rated at 50 watts (rms) per channel into a 4-ohm load, while the subwoofer channel is rated at 200 watts (rms) into a 4-ohm load.

  • Page 5: Applications (Set-Up Guide)

    Figures 1 through 3 (on pages 4 and 5) NOTE: For simplicity, Figures 1 through 4 do not show power, show how to configure the Kappa 255a to drive front and remote, and input connections. rear speakers and a subwoofer, tweeters and midrange speakers and a pair of subwoofers, and a tweeter/midrange component set, midbass speakers, and a subwoofer.
  • Page 6 A P P L I C A T I O N S ( c o n t i n u e d ) Figure 3. This wiring diagram shows a Kappa 255a amplifier driving a front set of tweeter/midrange components, a rear pair of midbass speakers, and a –...

  • Page 7: Precaution And Notes

    P R E C A U T I O N S A N D N O T E S • The Kappa 255a has five levels of circuit protection that • Always wear protective eyewear when using tools. monitor the amplifier and will shut it down if the •...

  • Page 8: Installation

    M P L I F I E R . . . A R T S I S T Refer to Figure 6 (below) for details of the Kappa 255a’s Examine and verify that the package includes the following front and rear panel connections. items: 1.
  • Page 9 (tuned) frequency (see Figure 8 on page 2). Power typically wasted in this region will now be 1. To use the Kappa 255a in a front/rear system, set the conserved and instead be available for frequencies the CROSSOVER controls to frequencies recommended by enclosure will reproduce.

  • Page 10: Troubleshooting

    Make sure the vehicle’s electrical system is Audio cycles A protection circuit Verify the following– working properly and power is reaching the Kappa 255a off and on; is turning the electrical system is (i.e., green LEDs on the top panel are on).

  • Page 11: Service Bulletin #Inf9701

    Models: Kappa 255a Subject: Damaged Output Transistors When the voltage from an automotive battery powering the Kappa 255a dips repeatedly dips below 8 volts, the class D regulator can become unstable. As result, excessive current flow can damage output transistors Q10,11,12,13 in the subwoofer section.

  • Page 12: Service Bulletin #Inf2001-02

    Model: Kappa 255a Subject: No Sound from Subwoofer Output In the event you receive a Kappa 255a with the complaint: “No sound from the subwoofer output”, replace transistor Q18 SMD (Surface Mount Device) with a TO-220 package, TIP31C transistor. For details, see instructions as described below.
  • Page 13 Infinity Systems Inc. 250 Crossways Park Dr. Woodbury, New York 11797 (516) 496-3400...

  • Page 22: Electrical Parts List

    KAPPA 255A Electrical Parts List Part # Description Reference Designator MAIN PCB CAPACITORS CP1126 CAP POLY FILM 1uF 10% 50V C3,3A CP1355 CAP,AE,2200uF 20% 2 C1,1A,2,2A CP1412 CAP,AE,47uF 20% 16v CP1415 CAP,AE,2.2uF 20% 50 C10,11,49,50 CP1417 CAP,AE,22uF 20% 16 C26-29,47,48 CP1426 CAP,SMD,0.1uF 20% 50V Z5U...
  • Page 23 Part # Description Reference Designator INDUCTORS MI1100 INDCTR,Air Core 0.38uH L2A-2D,6 MI1150 INDCTR,Pwr Out 70uH KA2 MI1179 INDCTR,Pwr,30uH +/-10 MI1095 INDCTR,Common Mode GT's L1,1A MI1149 XFMR,Auxiliar KA25 MI1148 XFMR,Pwr,KA255a RESISTORS RS1260 RES,MO,FP,3.3Kohm 5% 1W RS1385 RES,CF,68 ohm 5% 1/4W R9A-9D RS1700 RES,SMD,1Kohm 5% 1/8W R40,42,43,48...
  • Page 24 Part # Description Reference Designator PWM MODULE PCB CAPACITORS CP1426 CAP,SMD,0.1uF 20% 50V Z5U C2-5,10 CP1434 CAP,SMD,2.7NF,10%,100v CP1562 CAP,AE,330uF 20% 16 CP1565 CAP,AE,22uF 20% 10V SEMICONDUCTORS DI1132 DIODE,SMD,Swch LL-34 Pkg TR1108 XSTR,NPN,SMD,50V/150mA 2SC4936 TR1134 XSTR,NPN,40V/600mA SOT-89 PXT2222A Q3,4 TR1135 XSTR,NPN,60V/600MA SOT-89 PXT2907A Q1,5,6 MD0322011 PCB PWM MODULE IC1002...
  • Page 25 Part # Description Reference Designator SEMICONDUCTORS DI1132 DIODE,SMD,Swch LL-34 Pkg D1,2 IC1175 HI-PERF. DUAL OP-AMP NJM5532M IC1,2,3 TR1108 XSTR,NPN,SMD,50V/150mA 2SC4936 Q2,7 TR1125 XSTR,NPN,SMD,50V/150mA 2SA1781 Q3,8 TR1131 XSTR,NPN,SMD,50v/100mA 2SC3859 Q1,6 TR1166 XSTR,PNP, 150V/600mA 2N5401 Q4,9 TR1167 XSTR,NPN, 160V/600mA 2N5551 Q5,10 RESISTORS RS1700 RES,SMD,1Kohm 5% 1/8W R2,3,12,22,23,32...
  • Page 26 Part # Description Reference Designator MISC. CO1247 CONN,Header 8-Pos. R CO1267 CONN,Header 2-Pos. Right Angle CO1279 CONN,Header 3-Pos. Right Angle CO1280 CONN,Header 4-Pos. Right Angle XX1264 Shaft, 4 gang, Anodized SW1073 Slide Switch 2P3T Horizontal MD0316011 DIFFERENTIAL MODULE PCB CAPACITORS CP1415 CAP,AE,2.2uF 20% 50 C1-8...
  • Page 27 Part # Description Reference Designator RS1721 RES,SMD, 2.Kohm 5% 1/8W R16,18 RS1790 RES, F/CHIP, 2.7K ohm 5% 1/4W RS1962 RES,SMD, 62Kohm 5% 1/8W RS1983 RES,SMD,560 ohm 5% 1/8W RS2083 2K OHM POT. 20% LINEAR RS2085 200K OHM POT. 20% LINEAR FREQ-VRB RS2090 20K OHM POT.
  • Page 28 Part # Description Reference Designator CP1426 CAP,SMD,0.1uF 20% 50V Z5U C1,4,6,10,13 CP1440 CAP,SMD,560pF,5%,100v NPO 1 CP1445 CAP,AE,47NF 10% 100v C8,11,14 CP1557 CAP,SMD, 56pf, 5%,50v C9,12,15 CP1622 CAP,AE,1000uF,20%,16V SEMICONDUCTORS DI1010 DIODE,Rect,FAST,1A/100v UF1002 DI1127 DIODE,SMD,ZENER,5.6V,5%,CP T/R Z2,3 DI1132 DIODE,SMD,Swch LL-34 Pkg D1-6 IC1214 LM6218N DUAL OP-AMP IC1217...
  • Page 29 Part # Description Reference Designator MISC. MECHANICAL/EXTERNAL/PACKAGING MI1095 COMMON MODE INDUCTOR MI1100 AIR CORE INDUCTOR 0.38uH MI1150 INDUCTOR POWER OUT 70uH CC1028 FERRITE BEAD BR1365 TRANSISTOR BAR TO-220 BR1380 TRANSISTOR BAR TO-218 BR1382 REAR BRACKET SC1189 M3 X 1.25 X 10 SC1220 M2X 2.

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