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Kappa 255a
Automotive Amplifier SERVICE MANUAL

Infinity Systems Incorporated 250 Crossways Park Dr. Woodbury, New York 11797

Rev2

10/2004

Kappa 255a

- 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 EXPLODED VIEW............................................................................13 PCB DRAWINGS .............................................................................14 BLOCK DIAGRAMS...........................................................................20 ELECTRICAL PARTS LIST .................................................................22 SEMICONDUCTOR PINOUTS.............................................................30 SCHEMATICS ..................................................................................31 REVISIONS .....................................................................................43

Occasional refinements may be made to existing products without notice but will always meet or exceed original specifications unless otherwise stated

1

Kappa 255a

KAPPA 255A SPECIFICATIONS
POWER 4 OHM 2 OHM BRIDGE 4 OHM 1 OHM STABLE FREQUENCY RESPONSE EQUALIZATION FIXED AT 40Hz Q=1 +11dB CROSSOVER FLAT/LOW/HIGH PASS SWITCH DECADE SWITCH VAR. CONTROL SLOPE INPUT SENSITIVITY FULL DIFFERENTIAL INPUT POWER FUSE THD + NOISE 4 ohm 2 ohm bridge 4 ohm SIGNAL TO NOISE CHANNEL SEPARATION DAMPING FACTOR TURN ON TIME DC OFFSET OPERATING VOLTAGE REMOTE ON CURRENT QUIESCENT CURRENT MAX CURRENT PROTECTION auto reset spkr short spkr to ground thermal over voltage under voltage DIMENSIONS 4 x 50 and 1 x 200 watts 4 x 75 and 1 x 300 watts 2 x 150 and 1 x 200 watts PROTECTION 20-20KHz (+0 -3dB) SEE CHART BELOW

2 (40-320 & 250-2KHz) 2 12 250 mV ~ 9 V >100K IMP 40A X 2 (ATC) 0.05% 0.10% 0.10% >95dB (A Weighted Referenced to Full Power) >50dB (100 TO 20KHz) >204 3 SEC <50 mv 10 -16vdc <2ma <2.5 AMP 80 Yes Yes Yes 18vdc 8vdc 23 x 2 3 /16 x 8 1 /2 in. (W x H x L) 584.2 x 55.6 x 215.9 mm

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.

2

Kappa 255a

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. In bridged-mono configurations, front and rear amplifiers can deliver up to 150 watts (rms) for the same load. · · · · · · · · · · · · · 2-ohm operation, rated at 75 watts (rms) per channel for front and rear channels and 300 watts (rms) for the subwoofer channel Bridge/stereo switches for fast system setup Built-in 12 dB-per-octave electronic crossovers, variable from 32 to 320 Hz, with an "x15" front-channel switch (to increase the frequency range from 480 Hz to 4.8 kHz) Dynamic Bass OptimizerTM (DBO) 12 dB-per-octave subsonic filter with variable frequency (20 to 80 Hz) and Q for enhancing subwoofer low frequencies while conserving amplifier power Front and rear channels, individually selectable as highpass, low-pass, or through-pass External switch for subwoofer inputs allows direct connection to source units with subwoofer outputs Amplifier input sensitivity controls to match a wide range of input signal levels from 250 mV to 9 V Five protection levels guard against over-voltage, undervoltage, over-power, overtemperature, and over-current situations 2-color LED array indicates green when power is on and orange when protection is activated Industrial-grade, gold-plated, "pre-wire and plug-in" connectors for an easy-to-install highquality interface Transparent control cover to deter tampering yet provide a clear view of installation settings Built-in automotive type fuses to protect the amplifier UniblocTM chassis provides improved heat-sink capacity and exceptional RFI shielding characteristics

3

Kappa 255a

APPLICATIONS
Enclosed are several diagrams to help you plan your own system installation. Figures 1 through 3 (on pages 4 and 5) show how to configure the Kappa 255a to drive front and 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. For system expansion, see Figure 4 on the next page.
NOTE: For simplicity, Figures 1 through 4 do not show power, remote, and input connections.

R+

+

L

R+

+

L

Figure 1. This wiring diagram shows a Kappa 255a amplifier driving front and rear pairs of full-range speakers and a single subwoofer.

KAPPA 255a
(front panel)
RF

+ + LF

+ + RR LR

Set Switches As Shown
(set controls for your system plan)
FRONT REAR
9V

SUBWOOFER
9V

x15 x1
32Hz 320Hz

LP HP FLAT

C R O .25V S S O 32Hz V M E BR O R D 320Hz O ST E LP U T HP P FLAT U T

G A I N

C R O .25V S S 20Hz O V M D FREQ E BR O R 80Hz D B O ST MIN E U O Q T P MAX U T INT SUB INPUT EXT X O 32Hz V 60 E Hz R 320Hz EXT REAR INPUT FRONT LP

G 9V A I N .25V

G A I N

-

REM

R+

+

L

Set to EXT for source unit with subwoofer outputs

KAPPA 255a
(rear panel)

KAPPA 255a
(top panel)

SUBWOOFER 1 and 2 are common outputs and are supplied as a convenience for dual-subwoofer applications

+

-

Subwoofer

R+

+

L

R+

+

L

Figure 2. This wiring diagram shows a Kappa 255a amplifier driving a pair of tweeters, a pair of midrange speakers, and a pair of subwoofers (4 minimum).

KAPPA 255a
(front panel)

RF Tweeter

+ + -

+ + -

LR Mid

Set Switches As Shown
(set controls for your system plan)
FRONT REAR
9V

SUBWOOFER
9V

x15 x1
32Hz 320Hz

LP HP FLAT

C R O .25V S S O 32Hz V M E BR O R 320Hz D O ST E LP U T HP P FLAT U T

G A I N

C R O .25V S S 20Hz O V M D FREQ E BR O R 80Hz D B O ST MIN E U O Q T P MAX U T INT SUB INPUT EXT

G 9V A I N .25V

G A I N

LF Tweeter

RR Mid

REM

R+

+

L

X O 32Hz V 60 E Hz R 320Hz EXT REAR INPUT FRONT LP

Set to EXT for source unit with subwoofer outputs

FRONT LP creates bandpass when rear output is set to HP

KAPPA 255a
(rear panel)

+ Subwoofer
(4 min.)

+ Subwoofer
(4 min.)

KAPPA 255a
(top panel)

4

Kappa 255a

APPLICATIONS (continued)
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 single subwoofer.
R+ +
L

R+

+

L

Set Switches As Shown
(set controls for your system plan)
FRONT REAR
9V

KAPPA 255a
(front panel)

x15 x1
32Hz 320Hz

LP HP FLAT

9V G C A R I O .25V N S S O 32Hz V M E BR O R 320Hz D O ST E LP U T HP P FLAT U T

G C A A R I I O .25V N .25V N S S 20Hz O V M D FREQ E BR O R 80Hz D B ST MIN O E U O Q T P MAX U T INT SUB INPUT EXT X 32Hz O V 60 E Hz R 320Hz EXT REAR INPUT FRONT LP

SUBWOOFER 9V G

R Plate

+ + -

+ + -

L Midbass

L Plate
Set to EXT for source unit with subwoofer outputs

R Midbass

REM

R+

+

L

FRONT LP creates bandpass when rear output is set to HP

KAPPA 255a
(top panel)

KAPPA 255a
(rear panel)

SUBWOOFER 1 and 2 are common outputs and are supplied as a convenience for dual-subwoofer applications

+

-

SYSTEM EXPANSION
Figure 4. In this expanded system, a Kappa 52a drives a front pair of tweeters. The 52a's lowpass outputs feed a Kappa 255a to drive stereo pairs of midrange and midbass speakers. An external subwoofer signal feeds the Kappa 255a to drive the subwoofer(s). Another Kappa 52a drives a rear pair of speakers from the source unit's rear outputs.

Subwoofer

KAPPA 52a
Front L/R Inputs (from Source Unit) L/R Outputs (Low-Pass)

To Front L/R Tweeters

KAPPA 255a
Front L/R Inputs
FRONT REAR
9V

To L/R Midrange Speakers
x15 x1
32Hz 320Hz

Subwoofer Inputs (from Source Unit)
FRONT REAR

LP HP FLAT

9V G C A R I O .25V N S S O 32Hz V M E BR O R D 320Hz O ST E LP U T HP P FLAT U T

G G C A A R I I O .25V N .25V N S S 20Hz O V M D FREQ E BR O R 80Hz D B O ST MAX E U O Q T P MIN U T INT SUB INPUT EXT
X O 32Hz V E R 320Hz EXT

SUBWOOFER 9V

2

5

5

a

50w x 4 + 200W x 1

50W X 4 + 200W CLASS D DIGITAL SUBWOOFER AMPLIFIER

60 Hz REAR INPUT

FRONT LP

x15 x1

LP HP FLAT

C R O S S O V E BR R O ST U T P U T

BR LP HP FLAT O ST U T P U T

To L/R Midbass Speakers To Subwoofer(s)
REAR INPUT

EXT FRONT LP

SUBWOOFER

INT EXT

SUB INPUT

KAPPA 52a

Rear L/R Inputs (from Source Unit)

To Rear L/R Speakers

5

Kappa 255a

PRECAUTIONS AND NOTES
· The Kappa 255a has five levels of circuit protection that monitor the amplifier and will shut it down if the electrical system voltage drops below 10 Vdc or exceeds 15.5 Vdc, temperatures are above 194° F (90° C), short circuits occur, or current draw exceeds product specifications. For best performance, check the intended mounting site to make sure the operating environment does not create conditions that will trigger circuit protection. · Prior to installation, turn off all audio systems and other electrical devices. Also disconnect the () negative lead from the vehicle's battery. · At the installation site, locate and make a note of all fuel lines, hydraulic brake lines, and electrical wiring. Use extreme caution when cutting or drilling in and around these areas. · Use the amplifier as a mounting template to mark locations for the mounting holes. · Check clearances on both sides of a planned mounting surface before drilling any holes or installing any screws. Remember that mounting screws can extend up to an inch behind the surface. · Always wear protective eyewear when using tools. · The Kappa 255a uses gold-plated, industrial-grade Weco® plug-in connectors for power and speaker wiring. Because of precision tolerances, do not insert the connectors into the amplifier without pre-wiring them first. Once the wires are fastened in each shell, they provide additional gripping area for easy connector removal. · When routing cables, keep input signal cables away from power cables and output speaker wires, as shown in Figure 5 (below). · When making connections, make sure that each connection is clean and properly secured. Observe the polarity markings on the front and rear panels. Refer to the application drawings (Figures 1 through 3 on pages 4 and 5) to set up the amplifier for operation of various configurations. · If the amplifier's fuses need replacement, use only the same rating and type as replacements. Do not substitute another kind.

SPEAKER Cables

RF AUDIO Cables

RR

Chassis Ground

Source Unit

SUB

Ignition Battery
+

Fuses

LF

LR

Kappa 255a Amplifier

Chassis Ground POWER and REMOTE Cables

Chassis Ground

Figure 5. To minimize possible noise pickup, use this suggested cable routing scheme to plan your amplifier installation.

6

Kappa 255a

INSTALLATION
The Kappa 255a is easy to install. For optimum performance, we recommend using high-quality, twistedpair shielded RCA audio cables and 14-gauge or larger speaker wire. Also, you'll need a minimum of 10-gauge stranded copper wire (e.g., red and black jackets) for the power connections. Use 18-gauge (e.g., blue jacket) wire for remote turn-on. Depending on your total system plan, allow for adequate time and the possibility of overnight storage of your vehicle, since it may take more than one day to complete the installation.

MOUNTING THE AMPLIFIER...
The Kappa 255a can be mounted in virtually any location inside the vehicle. However, make sure to keep the amplifier away from heater vents or ducts. 1. At the chosen site, use the amplifier as a mounting template and mark locations of the four mounting holes. 2. Drill a small pilot hole at each marked location. 3. Mount the amplifier and securely tighten the mounting screws.

PARTS LIST...
Examine and verify that the package includes the following items: · (1) Kappa 255a Power Amplifier · (2) Spare ATC fast-blow fuses (40 A) · (1) Control cover with (2) machine screws · (1) Weco 5-pin audio connector · (2) Weco 4-pin audio connectors · (1) Weco 2-pin power connector · (4) #8 mounting screws

WIRING THE AMPLIFIER...
Refer to Figure 6 (below) for details of the Kappa 255a's front and rear panel connections. 1. For power, remote, and speaker wires, strip 1 /4" off one end of each jacket to reveal bare wire for insertion into the Weco connectors. 2. Using the Weco 2-pin power connector, connect a black wire from the nearest bare-metal chassis component to the () terminal. Then, connect a red wire from the vehicle's +12-volt battery terminal to the (+) terminal. 3. Make sure the wires are firmly seated in the Weco 2-pin connector and that each screw is completely tightened. Insert the wired connector into the POWER socket (on the amplifier's rear panel). Press it in until it stops.

KAPPA 255a WIRING CONNECTIONS
(front panel)

R

L

KAPPA 255a WIRING CONNECTIONS
(rear panel) Figure 6. Wiring connections for the Kappa 255a amplifier.

7

Kappa 255a

INSTALLATION (continued)
4. Using the Weco 5-pin connector, connect a blue wire from the source unit's remote connection to the REM terminal. Depending on polarity requirements (see Figures 1 through 3 on pages 4 and 5), connect speaker wires from the subwoofer(s) to the L and R (+ and ) terminals, as required by your system plan. 5. Make sure the wires are firmly seated in the Weco 5-pin connector and that each screw is completely tightened. Insert the wired Weco 5-pin connector into the SUBWOOFER socket (on the amplifier's rear panel). Press it in until it stops. 6. Using Weco 4-pin connectors, connect speaker wires from the front and rear speakers to the amplifier. Depending on your system plan (see Figures 1 through 3 on pages 4 and 5), match the polarities on the L and R (+ and ) terminals.
NOTE: In 3-way applications, the rear amplifier provides bandpass channels to drive midrange or midbass speakers.

SETTING INPUT SENSITIVITY...
Initially, turn the front and rear input sensitivity GAIN controls to their minimum (counter-clockwise) positions (refer to Figure 7). 1. Reconnect the () negative lead to your vehicle's battery. Apply power to the audio system and play a favorite music track from CD or tape.
NOTE: After the source unit is on, green LEDs (on the top panel) will illuminate, indicating the amplifier is on. If not, check the wiring, especially the remote connection from the source unit. Also refer to "Troubleshooting" on the next page.

2. On the source unit, increase the volume control to maximum position. Slowly increase the Front and Rear GAIN controls (clockwise) towards three o' clock and, at the same time, listen to the quality of the reproduced sound. At some point, you'll hear distortion on the music peaks. Stop the adjustment and turn it back slightly.

7. Make sure the wires are firmly seated in each Weco 4pin connector and that each screw is completely tightened. Insert the wired Weco 4-pin connectors into the FRONT and REAR sockets (on the amplifier's front panel). Press each one in until it stops. 8. Connect RCA cables from a source unit to the L /R, FRONT/REAR INPUT jacks. If the source unit has subwoofer outputs, also connect a pair of RCA cables from those jacks to the SUB INPUT jacks and set the SUB INPUT switch to EXT (see Figure 7).

SETTING DBO...
Dynamic Bass Optimizer (DBO) is a new approach to enhancing low-frequency reproduction in a vehicle. Conventional bass boost controls add bass at a fixed frequency and cause the amplifier to consume considerable power. DBO conserves valuable power at the lowest frequencies and allows you to adjust the level and "character" of the bass sound, instead of just the amount of boom. Since a subwoofer in a tuned box is given to overexcursion below the tuned frequency, set the FREQ control below the box's resonant (tuned) frequency (see Figure 8 on page 2). Power typically wasted in this region will now be conserved and instead be available for frequencies the enclosure will reproduce. Use the Q control to boost the bass at the set frequency by as much as 12 dB (at MAX position see Figure 8 on Page 2). For sealed enclosures, use DBO to enhance the output so it sounds more like a tuned box. This is a result of 12 dB of rolloff being added to the enclosure's rolloff and a flattening of frequency response (at the curve's knee) when Q is boosted. For infinite baffles, set the FREQ control to the speaker's Fs value (to keep the subwoofer from trying to create bass below the resonant frequency) and adjust the Q control according to personal taste.

SETTING THE CROSSOVERS...
1. To use the Kappa 255a in a front/rear system, set the CROSSOVER controls to frequencies recommended by the speaker manufacturer (see Figure 7). If the value is unknown, set the control midway. 2. For a 3-way system, set the OUTPUT and REAR INPUT switches to create the appropriate bandpass filters (see Figures 2 and 3 on pages 4 and 5).
FRONT REAR
9V

x15 x1
32Hz 320Hz

LP HP FLAT

9V G C A R I O .25V N S S O 32Hz V M E BR O R D 320Hz O ST E LP U T HP P FLAT U T

50W X 4 + 200W CLASS D DIGITAL SUBWOOFER AMPLIFIER

G G C A A R I I O .25V N .25V N S S 20Hz O V M D FREQ E BR O R 80Hz D B MIN O ST E U O Q T P MAX U T INT SUB INPUT EXT X O 32Hz V 60 E Hz R 320Hz EXT REAR INPUT FRONT LP

SUBWOOFER 9V

INSTALLING THE CONTROL COVER...
After wiring and testing the Kappa 255a amplifier, install the control cover using the enclosed machine screws to deter tampering and help seal out dust.
NOTE: Do not over-tighten the machine screws. Doing so may crack the cover.

Figure 7. Kappa 255a controls for crossover, input, output, and DBO (Dynamic Bass Optimizer).

8

Kappa 255a

TROUBLESHOOTING
Use the following guide to identify symptoms and solve problems. Make sure the vehicle's electrical system is working properly and power is reaching the Kappa 255a (i.e., green LEDs on the top panel are on). SYMPTOM
No audio

SYMPTOM

LIKELY CAUSE

SOLUTION
Verify the following electrical system is between 10 ~ 15.5 Vdc; temperature is not over 194°F (90°C); no short circuits; speaker loads are not less than 1 ohm (2 ohms in mono) Set Input Sensitivity correctly (see previous page)

LIKELY CAUSE
Low /No Remote Turn-On Voltage Speakers are not connected or are blown

SOLUTION
Check connections; test turn-on voltage Check wiring; use VOM/DVM to measure speaker coil impedance See Setting Input Sensitivity on previous page Check polarity of connections; refer to Applications

Audio cycles A protection circuit off and on; is turning the Amber protecamplifier off and on tion LEDs (on top panel) are on

Distorted audio

Input sensitivity is not set properly

Audio cycles GAIN is set too high off and on; Amber protection LEDs (on top panel) are on Fuse blows Incorrect wiring or short circuit

Audio lacks "punch"

Speakers are wired with wrong polarity

Check connections; refer to Applications

9

Kappa 255a

Service Bulletin
Service bulletin INF9701 Rev1 - August 2001 To: All Infinity Service Centers This is considered a Major repair 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. In the event you receive a Kappa 255a for any servicing reason, perform the modification as shown below. Affected units will have an "HC" in the prefix in a white serial # label (bottom of the unit).
Note: Many components in this product, including two due for replacement, are Surface Mount Devices.

Procedure: 1) Remove the (24) 9/64" allen screws from both lower sides of the chassis. 2) Remove the (2) #10 Torx screws from the bottom chassis underneath the tamper-proof labels. 3) Turn amplifier vertically and strike on a hard surface, dislodging the main PCB; slide entire assembly out of the chassis. 4) Remove and replace any defective IRFS250 output transistors. (Q10-13 are Infinity part# TR1238) 5) Change R3 on the Digital Predriver Module (PC1207) from 22kW to 2.2kW (Infinity part# RS1703). PC1207 is the small upright board located near the main PCB filter capacitors. R3 is on the component side of the board facing the outside of the amplifier. See Figure 1. 6) Change R15 on PWM Module (PC1149) from 1kW to 2.2kW W (Infinity part# RS1703). PC1149 is the small upright board located near the main power supply transformers. R15 is on the component side of the board facing the inside of the amplifier. See Figure 2. 7) Reinsert main PCB into chassis; confirm that all (20) insulators are still in place, attached with heat sink compound to each output device. 8) Insert and tighten all (24) chassis screws, including the (2) Torx screws on the bottom of the unit. Note: the (4) shorter, 5/8" screws are inserted at the ends of the amp chassis. 9) Attach all power, speaker and signal cables to amplifier and test.

Model KAPPA 255a KAPPA 255a

Serial number "HC" in the prefix below -01701 "HC" in the prefix -01701and above

Status Damaged Q10,11,12 or 13 Modified by factory

Action Change R3 & R15 to 2.2kW NONE REQUIRED

10

Kappa 255a

Service Bulletin
Service Bulletin INF2001-02 - September 2001 To: All Infinity Service Centers Warranty labor rate: MAJOR repair 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. All KAPPA 255A amplifiers with serial numbers starting with letters "CL" should be modified. The serial number is printed on a white label, located on the bottom of the Kappa 255A enclosure. Note: Many components in this product, including the one due for replacement, are Surface Mount Devices. Procedure: 1) 2) 3) 4) 5) 6) 7) Remove the (24) 9/64" Allen screws from both lower sides of the chassis. Remove the (2) #10 Torx screws from the bottom chassis underneath the tamper-proof labels. Turn amplifier vertically and strike on a hard surface, dislodging the main PCB; slide entire assembly out of the heatsink. Locate, identify, and remove Q18 SMD transistor on the bottom of the main PCB. See illustrations on page 2. Prepare the nearby area on the PCB by applying a white .5" x .75" BONDPLY insulator, (Infinity part# TO-220 BONDPLY-100) in the area where a new TIP31C transistor will be mounted. Apply a transistor TIP31C (Infinity part# TR1183) on top of the insulator; press firmly to set. Transistor should be flat on the PCB. Extend the three leads of the transistor by soldering a length of 22 gauge buss wire to each lead, the length determined by the connection points. Solder each wire piece to each lead (longer is better as it can always be cut) and then trim to the correct length. You will NOT be re-connecting the three leads to the tiny solder pads for the original SMD device; study the illustrations to locate the three final connection points. Cut three pieces of 1/16" vinyl or shrink tubing to insulate the three exposed leads, leaving enough wire exposed at the end to make the final soldered connections. Solder the three leads in the areas shown in the illustration. Transistor Q18 and new connecting wires MUST NOT be higher than the square plastic standoff next to it. Add a dab of RTV (silicon seal or similar non-conductive compound) to the area of the three leads. Test the unit, still out of the heatsink, by applying power, with signal and subwoofer connections WITH NO LOUDSPEAKER LOAD other than a DMM or an oscilloscope on the output terminals. Reinsert main PCB into chassis; confirm that all (20) insulators on the output devices are still in place, attached with heat sink compound on each one. Insert and tighten all (24) chassis screws, including the (2) Torx screws on the bottom of the unit. Note: the (4) shorter, 5/8" screws are inserted at the ends of the amp chassis. Attach all power, speaker and signal cables to amplifier and test with loudspeaker load.
MODEL KAPPA 255a SERIAL NUMBER "CL" in the serial # prefix All units affected STATUS Q18 Overheating ACTION Replace Q18 with TIP31C transistor

8) 9) 10) 11) 12) 13) 14)

11

Kappa 255a

12

Kappa 255a

Kappa 255a Exploded View

13

Kappa 255a

14

15

Kappa 255a

16

Kappa 255a

17

18

19

Kappa 255a

20

Kappa 255a

21

Kappa 255a

KAPPA 255A Electrical Parts List
Part # MAIN PCB CAPACITORS CP1126 CP1355 CP1412 CP1415 CP1417 CP1426 CAP POLY FILM 1uF 10% 50V CAP,AE,2200uF 20% 2 CAP,AE,47uF 20% 16v CAP,AE,2.2uF 20% 50 CAP,AE,22uF 20% 16 CAP,SMD,0.1uF 20% 50V Z5U C3,3A C1,1A,2,2A C14 C10,11,49,50 C26-29,47,48 C8A-8D,9A-9D,12,13,13A13D,16,17,17A,18,18A,20,2123,31,31A,35,40,41A,42A,43-46 C51,52 C10A-10D,11A-11D C8 C4A,5A C30 C15,15A,32,32A,41,42 C9 C4,5 C34 C33,36 C19,37,38 C6A,7A C24,25 2 4 1 4 6 33 2 8 1 2 1 6 1 2 1 2 3 2 2 Description Reference Designator Qty

CP1475 CP1496 CP1520 CP1545 CP1547 CP1552 CP1562 CP1584 CP1587 CP1609 CP1614 CP1624 CP1631

CAP,SMD,33pF,5%,50v NPO 1 CAP,SMD,100pF 10% 50V X7R CAP,SMD,.01uF 10% 50V T/ CAP,AE,4700uF 20% CAP,AE,100uF 20% 35 CAP,SMD,.1uF 20% 100v Z5U CAP,AE,330uF 20% 16 CAP,AE,6800uF,20%,63V CAP,CER DISC 0.001uF 10% CAP,MF,1uF,5%,100 CAP,Mylar 6.8uF,5%,100V CAP,AE,2200uF,20% CAP,AE,220uF 20% 35

SEMICONDUCTORS DI1005 DI1010 DI1053 DI1054 DI1132 DI1167 IC1041 TR1063 TR1108 TR1125 TR1131 TR1134 TR1135 TR1157 TR1183 TR1184 TR1208 TR1209 TR1238 TR1255 TR1256 TH1006 DIODE,Rect,3A/200V 1N5401 DIODE,Rect,FAST,1A/100v UF1002 DIODE,Rect Dual Comm Cathd 16A DIODE,Rect Dual Comm Anode 16A DIODE,SMD,Swch LL-34 Pkg DIODE,SMD,ZENER,16V,5%,CP T/R IC,SMD,DUAL,J-FET-TL072 XSTR,NPN,40v/600mA MPS2222A XSTR,NPN,SMD,50V/150mA 2SC4936 XSTR,NPN,SMD,50V/150mA 2SA1781 XSTR,NPN,SMD,50v/100mA 2SC3859 XSTR,NPN,40V/600mA SOT-89 PXT2222A XSTR,NPN,60V/600MA SOT-89 PXT2907A Fet Pwr 60v/35A/28mohm IRFZ44 XSTR,NPN,3A/100v/40W TIP31C XSTR,NPN,3A/100v/40W TIP32C XSTR,NPN,SMD,120V/50mA 2SA1514K XSTR,NPN,SMD,80v/50mA 2SC3906K Fet powr 200V/30A/190W IRFP250 XSTR,NPN,25A/100V TIP35C XSTR,NPN,25A/100V TIP36C THERMISTOR,NTC,10Kohm @ 25degC D1,1A,2,2A D5,6,7,8,9,17,18,19,D20,21,22,28,29 D3,3A D4,4A D9A-9D,11,12,14,15,16,23-27 Z1-3 IC1 Q11A-11D Q9,27 Q8,15,28 Q7 Q18 Q16,17 Q1,1A,2,2A,3,3A,4,4A,5,5A,6,6A Q9A-9D,26 Q10A-10D,25 Q19 Q12A-12D,14 Q10-13 Q7A-7D Q8A-8D TH1 4 13 2 2 14 3 1 4 2 3 1 1 2 12 5 5 1 5 4 4 4 1

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Kappa 255a
Part # INDUCTORS MI1100 MI1150 MI1179 MI1095 MI1149 MI1148 RESISTORS RS1260 RS1385 RS1700 RS1701 RS1702 RS1703 RS1704 RS1705 RS1706 RS1710 RS1717 RS1722 RS1725 RS1826 RS1831 RS1868 RS1871 RS1878 RS1898 RS1916 RS1946 RS1957 RS2159 RS2160 RS2273 MISC. BR1344 BR1369 BR1372 BR1391 CC1028 CO1315 CO1316 CO1318 CO1321 FH1001 HA1036 TE1110 TE1178 BusBar,Copper,3-Term BusBar,Copper,7 Term,63 BusBar,Copper,2 Term,1000 BusBar,Copper,7 Term,1 Ferrite Bead CONN,Power,Pin Gold CONN,Speaker,Pin Gol CONN,RCA Jack Dual Separate Gn CONN,Header 4-Pos. R HOLDER,Fuse,Right Angle HARNESS, SHIELDED WIRE, 10" Terminal Pocket CONN,Faston Female 0.032" x 0. BB1,3 BB4,7 BB2,5,12,14,15,16BB10,11 BB8,9 FB1,1A,2,2A,3,3A,4FB4A,5,5A,6,6A,7,7A, FB8,8A,FB13,14 POWER CONN CONN 3 FRONTIN, REARIN, SUBWIN CONN1,2 F1,1A COAX SUBWFR FRONT(+L,-L,+R,-R) REAR(+L,-L,+R,-R) CLIP1-6 2 2 8 2 18 2 5 3 2 2 1 16 6 RES,MO,FP,3.3Kohm 5% 1W RES,CF,68 ohm 5% 1/4W RES,SMD,1Kohm 5% 1/8W RES,SMD,10Kohm 5% 1/8W RES,SMD,100Kohm 5% 1/8W RES,SMD,2.2Kohm 5% 1/8W RES,SMD,22Kohm 5% 1/8W RES,SMD,4.7Kohm 5% 1/8W RES,SMD,47Kohm 5% 1/8W RES,SMD,3.3Kohm 5% 1/8W RES,SMD,100 ohm 5% 1/8W RES,SMD,470 ohm 5% 1/8W RES,SMD,15Kohm 5% 1/8W RES,SMD,27 ohm 5% 1/8W RES,SMD,7.5Kohm 5% 1/8W RES,CF,0.1 ohm 5% 5W RES,SMD,5.1Kohm 5% 1/8W RES,SMD,10 ohm 5% 1/8W RES,SMD,10Kohm 1% 1/8W RES,CF,5.1 ohm 5% 1/4W RES,SMD,49.9Kohm 1% 1/8W RES,SMD,4.99Kohm 1% 1/8W RES,SMD,2.2 OHM 5% 1/8W RES,SMD,11Kohm 1% 1/8W RES,WW,0.05 ohm 5% 5W L R10 R9A-9D R40,42,43,48 R8,11-13,17A-17D,24-26,39,41,68 R7 R34,52 R14 R16A-16D,23,37 R18A-18D,38,49 R22 R1,1A,2,2A,3,3A,4,4A,5,5A,6,6A,29,30 R45 R69,69A,70,70A,15A-15D R31-33,44 R12A-12D R9,10A-10D,11A-11D R13A-13D R14A-14D,47 R36 R7A-7D,8A-8D R15-18 R35 R27,28 R19,20 R21,46 1 4 4 14 1 2 1 6 6 1 14 1 8 4 4 9 4 5 1 8 4 1 2 2 2 INDCTR,Air Core 0.38uH INDCTR,Pwr Out 70uH KA2 INDCTR,Pwr,30uH +/-10 INDCTR,Common Mode GT's XFMR,Auxiliar KA25 XFMR,Pwr,KA255a L2A-2D,6 L3 L4 L1,1A T1 T1A 5 1 1 2 1 1 Description Reference Designator Qty

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Kappa 255a
Part # Description PWM MODULE PCB CAPACITORS CP1426 CP1434 CP1562 CP1565 CAP,SMD,0.1uF 20% 50V Z5U CAP,SMD,2.7NF,10%,100v CAP,AE,330uF 20% 16 CAP,AE,22uF 20% 10V C2-5,10 C1 C6 C19 5 1 1 1 Reference Designator Qty

SEMICONDUCTORS DI1132 TR1108 TR1134 TR1135 MD0322011 IC1002 TY1000 RESISTORS RS1700 RS1701 RS1702 RS1703 RS1705 RS1709 RS1710 RS1711 RS1717 RS1724 RS1733 RS1783 RS1826 RS1878 MISC. CO1249 CO1267 CONN,Header 4-Pos. Right Angle CONN,Header 2-Pos. Right Angle P1 P2,3,4 1 3 1 RES,SMD,1Kohm 5% 1/8W RES,SMD,10Kohm 5% 1/8W RES,SMD,100Kohm 5% 1/8W RES,SMD,2.2Kohm 5% 1/8W RES,SMD,4.7Kohm 5% 1/8W RES,SMD,680ohm 5% 1/8W RES,SMD,3.3Kohm 5% 1/8W RES,SMD,220ohm 5% 1/8W RES,SMD,100 ohm 5% 1/8W RES,SMD,6.8K ohm 5% 1/8W RES,SMD,510 ohm 5% 1/8W RES,SMD,12Kohm 5% 1/8W RES,SMD,27 ohm 5% 1/8W RES,SMD,10 ohm 5% 1/8W R2,15,18 R9,11 R5 R8 R6,19 R10 R23 R14 R16,17 R4 R3 R7 R12,13 R1 3 2 1 1 2 1 1 1 2 1 1 1 2 1 DIODE,SMD,Swch LL-34 Pkg XSTR,NPN,SMD,50V/150mA 2SC4936 XSTR,NPN,40V/600mA SOT-89 PXT2222A XSTR,NPN,60V/600MA SOT-89 PXT2907A PCB PWM MODULE PWM IC TL494CN SCR MCR22-2 D1 Q2 Q3,4 Q1,5,6 IC1 SCR1 1 1 2 3 1 1 1

MD0314011 PRE-AMP DRIVER MODULE PCB CAPACITORS CP1411 CP1412 CP1417 CP1426 CP1475 CP1496 CP1520 CP1557 CP1563 CAP,AE,100uF 20% 20V CAP,AE,47uF 20% 16v CAP,AE,22uF 20% 16 CAP,SMD,0.1uF 20% 50V Z5U CAP,SMD,33pF,5%,50v NPO 1 CAP,SMD,100pF 10% 50V X7R CAP,SMD,.01uF 10% 50V T/ CAP,SMD, 56pf, 5%,50v CAP,SMD,150pF,5%,50v NPO 1 C34,35 C27,28,33,42 C25,31 C4,5,10,11,21,22,29,30,36,37,38,39 C3,6,12,13,16,17,26,32,40,41 C7,18 C2,15,23,24 C8,9,19,20 C1,14

2 4 2 12 10 2 4 4 2

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Kappa 255a
Part # SEMICONDUCTORS DI1132 IC1175 TR1108 TR1125 TR1131 TR1166 TR1167 RESISTORS RS1700 RS1701 RS1702 RS1703 RS1706 RS1717 RS1721 RS1722 RS1725 RS1783 RS1831 RS1871 RS1983 RS2090 MISC. SW1072 XX1264 CO1279 CO1248 CO1267 CO1280 Slide Switch 2P2T Horizontal Shaft, 4 gang, Anodized CONN,Header 3-Pos. Right Angle CONN,Header 6-Pos. Right Angle CONN,Header 2-Pos. Right Angle CONN,Header 4-Pos. Right Angle SW1 VR1 HD1 HD3 HD1 HD4 1 1 1 1 1 1 RES,SMD,1Kohm 5% 1/8W RES,SMD,10Kohm 5% 1/8W RES,SMD,100Kohm 5% 1/8W RES,SMD,2.2Kohm 5% 1/8W RES,SMD,47Kohm 5% 1/8W RES,SMD,100 ohm 5% 1/8W RES,SMD, 2.Kohm 5% 1/8W RES,SMD,470 ohm 5% 1/8W RES,SMD,15Kohm 5% 1/8W RES,SMD,12Kohm 5% 1/8W RES,SMD,7.5Kohm 5% 1/8W RES,SMD,5.1Kohm 5% 1/8W RES,SMD,560 ohm 5% 1/8W 20K OHM POT. 20% LINEAR R2,3,12,22,23,32 R4,18,19,24,38,39,44,46,49 R13,14,33,34 R10,11,30,31,52,53 R14 R17,20,37,40 R43,45,48,50 R15,16,35,36 R6,9,26,29 R51 R7,8,27,28 R1,21 R42,47 VR1 6 9 4 6 1 4 4 4 4 1 4 2 2 2 DIODE,SMD,Swch LL-34 Pkg HI-PERF. DUAL OP-AMP NJM5532M XSTR,NPN,SMD,50V/150mA 2SC4936 XSTR,NPN,SMD,50V/150mA 2SA1781 XSTR,NPN,SMD,50v/100mA 2SC3859 XSTR,PNP, 150V/600mA 2N5401 XSTR,NPN, 160V/600mA 2N5551 D1,2 IC1,2,3 Q2,7 Q3,8 Q1,6 Q4,9 Q5,10 2 3 2 2 2 2 2 Description Reference Designator Qty

MD0315011 LP/HP CROSSOVER PCB CAPACITORS CP1177 CP1426 CAP POLY FILM 0.22uF 5% 63V CAP,SMD,0.1uF 20% 50V Z5U C1,2,9,10 C5,6,7,8 4 4

SEMICONDUCTORS IC1041 IC1162 RESISTORS RS1701 RS1702 RS1703 RS1779 RS2084 RES,SMD,10Kohm 5% 1/8W RES,SMD,100Kohm 5% 1/8W RES,SMD,2.2Kohm 5% 1/8W SMD 0 OHM JUMPER 20K OHM POT. 20% LINEAR R1-7, 12-18, 22,23 R20,21 R8-11 J1-4 VR 16 2 4 4 2 IC,SMD,DUAL,J-FET-TL072 IC,SMD,QUAD,J-FET-TL074 IC3 IC1,2 1 2

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Kappa 255a
Part # MISC. CO1247 CO1267 CO1279 CO1280 XX1264 SW1073 CONN,Header 8-Pos. R CONN,Header 2-Pos. Right Angle CONN,Header 3-Pos. Right Angle CONN,Header 4-Pos. Right Angle Shaft, 4 gang, Anodized Slide Switch 2P3T Horizontal HD3 HD4 HD1 HD2 VR SW2 1 1 1 1 1 1 Description Reference Designator Qty

MD0316011 DIFFERENTIAL MODULE PCB CAPACITORS CP1415 CP1426 CP1475 CAP,AE,2.2uF 20% 50 CAP,SMD,0.1uF 20% 50V Z5U CAP,SMD,33pF,5%,50v NPO 1 C1-8 C17,18 C9-16 8 2 8

SEMICONDUCTORS IC1041 RESISTORS RS1898 RS1946 RS1957 RS2113 MISC. CO1279 CO1330 CONN,Header 3-Pos. Right Angle CONN,Header 12-Pos. Single row+B214 MODULATOR/SUM/CROSSOVER PCB CAPACITORS CP1177 CP1412 CP1417 CP1426 CP1428 CP1625 CAP POLY FILM 0.22uF 5% 63V CAP,AE,47uF 20% 16v CAP,AE,22uF 20% 16 CAP,SMD,0.1uF 20% 50V Z5U CAP,SMD,1000pF,10%,100v NPO 1 CAP POLY FILM 0.47uF 5% 63V C3,3A C11,14 C9 C1,2,15,16 C10,12,13 C6 2 2 1 4 3 1 HD2 HD1 1 1 RES,SMD,10Kohm 1% 1/8W RES,SMD,49.9Kohm 1% 1/8W RES,SMD,4.99Kohm 1% 1/8W RES,SMD, 24.9Kohm 1% 1/8W R18,20,22,24 R1,2,5,6,9,10,13,14 R17,19,21,23 R3,4,7,8,11,12,15,16 4 8 4 8 IC,SMD,DUAL,J-FET-TL072 IC1,2,3,4 4

SEMICONDUCTORS IC1041 IC1162 IC1175 RESISTORS RS1701 RS1702 RS1703 RES,SMD,10Kohm 5% 1/8W RES,SMD,100Kohm 5% 1/8W RES,SMD,2.2Kohm 5% 1/8W R1-4, 6-10, 17,19 R20 R5,11,12 11 1 3 IC,SMD,DUAL,J-FET-TL072 OP-AMP IC,SMD,QUAD,J-FET-TL074 OP-AMP HI-PERF. B351 NJM5532M DUAL OP-AMP IC1 IC2 IC3 1 1 1

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Kappa 255a
Part # RS1721 RS1790 RS1962 RS1983 RS2083 RS2085 RS2090 RS2286 RS2308 MISC. SW1072 CO1279 CO1280 CO1257 XX1264 Slide Switch 2P2T Horizontal CONN,Header 3-Pos. Right Angle CONN,Header 4-Pos. Right Angle CONN,Header 9 PIN Right Angle Shaft, 4 gang, Anodized BASS/SELECT/INPUT HDR3 HDR1 HDR2 VRA,FREQ-VRB,VRA/FREQ,GAIN,Q 2 1 1 1 4 Description RES,SMD, 2.Kohm 5% 1/8W RES, F/CHIP, 2.7K ohm 5% 1/4W RES,SMD, 62Kohm 5% 1/8W RES,SMD,560 ohm 5% 1/8W 2K OHM POT. 20% LINEAR 200K OHM POT. 20% LINEAR 20K OHM POT. 20% LINEAR 500 OHM POT. 20% LINEAR RES,SMD,620 ohm 5% 1/8W Reference Designator R16,18 R21 R14 R15 VRA FREQ-VRB VAR-FREQ-GAIN Q R13 Qty 2 1 1 1 1 1 3 1 1

MD0323011 FRONT CHANNEL CROSSOVER PCB CAPACITORS CP1177 CP1426 CP1534 CAP POLY FILM 0.22uF 5% 63V CAP,SMD,0.1uF 20% 50V Z5U CAP POLY FILM 15NF 5% 63V C1,2,9,10 C5-8 C3,4,11,12 4 4 4

SEMICONDUCTORS IC1041 IC1162 RESISTORS RS1701 RS1702 RS1703 RS2084 MISC. SW1071 SW1073 XX1264 CO1279 CO1280 CO1247 CO1267 CO1304 Slide Switch 4P2T Horizontal Slide Switch 2P3T Horizontal Shaft, 4 gang, Anodized CONN,Header 3-Pos. Right Angle CONN,Header 4-Pos. Right Angle CONN,Header 8-Pos. R CONN,Header 2-Pos. Right Angle CONN,Header 2-Pos. Single row SW1 SW2 VR HD1 HD2 HD3 HD4 CONN1 1 1 1 1 1 1 1 1 RES,SMD,10Kohm 5% 1/8W RES,SMD,100Kohm 5% 1/8W RES,SMD,2.2Kohm 5% 1/8W 20K OHM POT. 20% LINEAR R1-7,12-18,22,23 R20,21 R8-11 VR 16 2 4 4 IC,SMD,DUAL,J-FET-TL072 OP-AMP IC,SMD,QUAD,J-FET-TL074 OP-AMP IC3 IC1 1 1

MD0326011 MODULATOR MODULE PCB CAPACITORS CP1411 CP1417 CAP,AE,100uF 20% 20V CAP,AE,22uF 20% 16 C3 C5,7 1 2

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Kappa 255a
Part # CP1426 CP1440 CP1445 CP1557 CP1622 Description CAP,SMD,0.1uF 20% 50V Z5U CAP,SMD,560pF,5%,100v NPO 1 CAP,AE,47NF 10% 100v CAP,SMD, 56pf, 5%,50v CAP,AE,1000uF,20%,16V Reference Designator C1,4,6,10,13 C16 C8,11,14 C9,12,15 C2 Qty 5 1 3 3 1

SEMICONDUCTORS DI1010 DI1127 DI1132 IC1214 IC1217 TR1063 TR1134 TR1166 TR1167 RESISTORS RS1700 RS1701 RS1702 RS1704 RS1705 RS1711 RS1715 RS1722 RS1724 RS1790 RS1791 RS1796 RS1821 RS1912 RS1968 RS1984 MISC. CO1250 CO1280 CONN,Header 7-Pos. Right Angle CONN,Header 4-Pos. Right Angle LAMP HARNESS HA1015 TE1173 TE1110 HA1036 CO1331 LA1028 XX1140 XX1268 DI1132 RS1705 TR1134 PWM-Lamp Harness Crimp Terminal 22-30 AWG Terminal Pocket Harness- Shielded wire CONN,Header 3-Pos. Right Angle Pilot Lamp 3mm 14v Green Filter Red/Amber Filter DIODE,SMD,Swch LL-34 Pkg RES,SMD,4.7Kohm 5% 1/8W XSTR,NPN,40V/600mA SOT-89 PXT2222A HD2 HD1 1 1 RES,SMD,1Kohm 5% 1/8W RES,SMD,10Kohm 5% 1/8W RES,SMD,100Kohm 5% 1/8W RES,SMD,22Kohm 5% 1/8W RES,SMD,4.7Kohm 5% 1/8W RES,SMD,220ohm 5% 1/8W RES,SMD,5.6Kohm 5% 1/8W RES,SMD,470 ohm 5% 1/8W RES,SMD,6.8K ohm 5% 1/8W RES, F/CHIPF, 2.7K ohm 5% 1/4W RES,SMD, 39K ohm 5% 1/8W RES,SMD, 6.2K ohm 5% 1/8W RES, F/CHIP, 10 ohm 5% 1/4W RES,SMD,11Kohm 1% 1/8W RES,SMD,2.2 Meg ohm 5% 1/8W RES,SMD,3.9Kohm 5% 1/8W R1,5,8,18,26,31 R9,17,19,20,27,29 R13 R3 R12 R23 R28 R2,4,6,25 R21 R24 R22 R10 R7,15 R30 R14 R11,16 6 6 1 1 1 1 1 4 1 1 1 1 2 1 1 2 DIODE,Rect,FAST,1A/100v UF1002 DIODE,SMD,ZENER,5.6V,5%,CP T/R DIODE,SMD,Swch LL-34 Pkg LM6218N DUAL OP-AMP IR2111 HALF-BRIDGE DRIVER XSTR,NPN,40v/600mA MPS2222A XSTR,NPN,40V/600mA SOT-89 PXT2222A XSTR,PNP, 150V/600mA 2N5401 XSTR,NPN, 160V/600mA 2N5551 D4 Z2,3 D1-6 IC2 IC1 Q4 Q1 Q3 Q2 1 2 6 1 1 1 1 1 1

CONN 1,2 LAMP 1,2,3,4,5,6,7,8 LAMP 2,4,5,7 LAMP 1,3,6,8 D1,2 R1,2 Q1,2

2 8 4 4 2 2 2

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Kappa 255a
Part # Description Reference Designator Qty

MISC. MECHANICAL/EXTERNAL/PACKAGING
MI1095 MI1100 MI1150 CC1028 BR1365 BR1380 BR1382 SC1189 SC1220 SC1224 SC1257 SC1258 SP1073 SP1082 SA0308131 SH1105 XX1262 CO1312 CO1313 CO1325 FS1061 SC1208 SC1254 SC1255 COMMON MODE INDUCTOR AIR CORE INDUCTOR 0.38uH INDUCTOR POWER OUT 70uH FERRITE BEAD TRANSISTOR BAR TO-220 TRANSISTOR BAR TO-218 REAR BRACKET M3 X 1.25 X 10 M2X 2. 0 X 0.79 HL THREAD 6-20 X 3/8" TORX PAN 6-20 X 1" SOCKET HEAD 6-20 X 5/8" SOCKET HEAD SILICON PAD TO-3P 1" X 0.75" 1/4" SPONGE ACCESSORY BAG OWNER'S MANUAL ACRYLIC COVER 5 PIN SPEAKER PLUG 2 PIN POWER CONNECTOR 4 PIN SPEAKER PLUG AUTO FUSE 40A/32V #8 X 7/8 THREAD 6-32 X 1/4" Phil - Nick Plated 6-32 X 3/8" Phil Nick Plated 1 1 1 1 2 1 1 3 2 2 25 4 20

1 1 1 1 1 2 2 4 1 1

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30

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31

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32

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33

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35

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36

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37

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38

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39

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40

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Kappa 255a

DATE
11/14/96

REVISION
C

CHANGE DESCRIPTION
CHANGE R31-34 FROM 5.1 TO 27 CHANGE R9 FROM 10/5W TO 0.1/5W CHANGE F1 FROM 30A TO 40A CHANGE R15A-D FROM 8.2K TO 15K CHANGE R22 FROM 10K TO 3.3K CHANGE R21,46 FROM 0.1/5W TO .05/5W CHANGE R45 FROM 1K TO 470 CHANGE Z3 FROM DZD15-TB TO ZDZ16-TB ADD R48 1K, D9 UF4002 ADD R49 47K CHANGE FRONT CHANNEL FROM X10 TO x15 CHANGE PHASE SUBWOOFER AMP CHANGE L3 FROM 37µH TO 30µH CHANGE DIGITAL PRE DRIVER MODULE PART NUMBER FROM PC1157 ZD143 TO PC1207 ZD213 CHANGED R3 FROM 22K TO 2.2K DELETE D2 TO D7,C7,C8,C9,C11,R20,R21,R22,R24,R25,SCR2 DELETE D3 CHANGED R15 FROM 1K TO 2.2K

REASON OF CHANGE

CHANGED

ECN#

12/18/96

E

PREMATURE SUTDOWN

S.ROJAS

01/19/97 02/20/97 02/27/97 08/15/97 12/03/96 03/06/96 08/15/97 01/19/97

F G H 01 01 01 02 03

POP-CLICK ON/OFF FREQUENCY LOWER THD LOWER THD & POP-CLICK ON/OFF INCREASED VOLTAGE IR2111 FROM 11V TO 13V FALSED TRIGGERING ON SHORT CIRCUIT PROTECTION FALSED TRIGGERING ON SHORT CIRCUIT PROTECTION DECREASE SENSITIVITY REMOTE ON/OFF 8V INSTEAD 6.5V. FREQUENCY CHANGE

S.ROJAS A. BUTTERS S.ROJAS M. RODRIGUEZ S.ROJAS M. RODRIGUEZ S.ROJAS R. MACIAS R. MACIAS S.ROJAS A. BUTTERS 10216 7D272 10216

CHANGED FREQ. FROM X10 (320-3.2kHz) to x15 (480-4.8kHz)

43