JBL A6000GTi Service Manual Download

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A6000GTi

Car Audio

Power Amplifier

Service Manual



2003 by Crown Audio, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000

U.S.A. Telephone: 574-294-8000. Trademark Notice:

Crown



is a

registered trademark of Crown International, Inc; JBL



is a registered

trademark of JBL. Other trademarks are the property of their respective
owners.

137159-1

11/03

Rev. 1

Summary of Contents for A6000GTi

Page 1: ...Inc P O Box 1000 Elkhart Indiana 46515 1000 U S A Telephone 574 294 8000 Trademark Notice Crown is a registered trademark of Crown International Inc JBL is a registered trademark of JBL Other tradema...

Page 2: ...e expense Crown Audio reserves all rights in connection with this document and in the subject matter presented therein The recipient hereby acknowledges these rights and shall not without Crown Audio...

Page 3: ...137159 1 Rev 1 A6000GTi Service Manual 2003 Crown Audio Inc III Revision History Revision Number Date Comments Rev 1 11 2003 Initial Draft...

Page 4: ...137159 1 Rev 1 A6000GTi Service Manual 2003 Crown Audio Inc IV This page intentionally left blank...

Page 5: ...IRCUITRY 3 5 3 2 1 Current Monitor 3 5 3 2 2 Current Limiter 3 5 3 2 3 Display Circuitry 3 5 3 2 4 Thermal Limit Control TLC 3 6 3 3 POWER SUPPLY 3 7 3 3 1 Switching Power Supply Operation 3 7 3 3 2 S...

Page 6: ...uency Response 4 13 4 6 5 Short Circuit Test 4 13 4 6 6 Output Power 4 13 4 7 CALIBRATIONS 4 14 4 7 1 Amplifier Power up 4 14 4 7 2 DC offset adjustment 4 14 4 7 3 Overlap correction 4 14 4 7 4 Curren...

Page 7: ...pe This Service Manual is intended to apply to all versions of the A6000GTi amplifier The Parts Listings include parts specific for all versions Parts are available from the Crown Parts Department 1 3...

Page 8: ...137159 1 Rev 1 A6000GTi Service Manual 2003 Crown Audio Inc Introduction 1 2 Figure1 1 JBL Warranty...

Page 9: ...n Parallel Required Battery Voltage 10 0 16 0 VDC DC Line Current For 6000W 700A At idle Amp draws 12 0A and no more than 200 watts 2 2 Performance Frequency Response 3dB from 10Hz to 200Hz at 1 watt...

Page 10: ...tch used to control filter rolloff Switch in 12 pos yields 12dB per octave rate of rolloff Switch in 24 pos yields 24dB per octave rate of rolloff LP Freq Crossover frequency adjustment from 32Hz to 3...

Page 11: ...ched loads overloaded power supplies excessive temperature input overload damage and high frequency blowups They also protect loudspeakers from input output DC large or dangerous DC offsets and turn o...

Page 12: ...the signal to the pass thru RCA connectors on the input panel The signal is then passed through the low pass Butterworth filter The pot R131 is used to adjust the signal phase from 0 to 180 The switc...

Page 13: ...tion of the differential comparator The balanced output of U502 forms the positive portion of the output waveform Vp The output of U505 is also balanced and forms the negative portion of the output wa...

Page 14: ...Quiescent operation will be considered first At the start of a switching cycle Swp and Swn are both turned on Current flows from Vcc through Swp through Lp through Ln through Swn and down to Vcc The c...

Page 15: ...rent in the Lp and Ln inductors to completely cancel at the B1 node This drastically reduces the filtering requirements necessary after the output stage If an audio signal is present at the input of t...

Page 16: ...current limit allows the amplifier to play thru current limit situations without severely degrading the sound 3 2 3 Display Circuitry After the input signal leaves the input board it is routed to the...

Page 17: ...wer supply switching devices When the devices begin to overheat the TLC circuit begins to compress the input signal scaling back the output power until the unit is capable of cooling itself again On t...

Page 18: ...nd the output voltage is stepped up to 288 volts peak to peak The AC voltage is rectified to 144 volts DC These are the rail voltages for the audio section 3 3 2 Switching Power Supply Protection Circ...

Page 19: ...8 which is a 0 04 ohm resistor to a set voltage limit of 0 65 volts U18 is the comparator that performs this function The output of U18 is tied to the shutdown pin of the PWM and to a 5 volt pull up r...

Page 20: ...emblies for broken traces and loose connections Be thorough The time you spend visually inspecting the amp is time well spent 4 2 Surface Mount Technology The A6000GTi amplifier uses surface mount tec...

Page 21: ...r remove the four large Torx head screws at bottom corners Figure 4 1 2 Turn the amplifier over to view the top Using a 5 32 inch Allen wrench remove the four cap head screws on the clear plexiglas co...

Page 22: ...isplay board Disconnect the ribbon cable from the back of the display board 9 Using a T 15 screwdriver remove the 23 Torx head screws on the perforated shield 10 Using a small flat blade screwdriver d...

Page 23: ...ed black blue red black blue 3 Disconnect the cable 4 Connect a 600 Ohm 10 watt resistor as shown in Figure 4 4 Be careful not to touch the leads as voltages in excess of 100V could be present 5 Wait...

Page 24: ...connectors 4 Using a 3 16 inch Allen wrench remove the two cap head screws in the power connectors Then remove the two power connectors and washers 5 Using a T 15 screwdriver remove the 2 Torx head s...

Page 25: ...driver remove the five Torx head screws from the bottom of the amplifier holding the plastic pip holder to the chassis 2 Disconnect the two ribbon cables from the pip board Both of these cable connect...

Page 26: ...screws holding down the PWA 6 Remove power supply assembly NOTE If power supply is difficult to remove double check to confirm that ALL screws have been removed 4 3 6 BCA Assembly Removal 1 Using a T...

Page 27: ...A See Figure 4 8 the other end is connected to the input PWA 5 Remove eight wires that connect the coil PWA to the Main PWA 2 red 2 black 2 blue 2 black white via a faston connection Carefully remove...

Page 28: ...ircuit should shut the amp down with approximately 16 0V and turn back on with approximately 14 5V Battery UV This LED E6 indicates the battery voltage is less than 8V Check the battery voltage The ci...

Page 29: ...2 in the audio section Check for gate to drain shorts on the mosfets as an indication of a blown part Replace the blown components and the gate drive module Often when a mosfet blows it damages the ga...

Page 30: ...e audio section and check the voltage again If the voltage is still low verify that at least 12 volts is present on the power input to the amplifier Measure the voltage on the secondary of the power t...

Page 31: ...4 9 Required Test Equipment 4 6 Electrical Checkout Procedure The test procedures in this section are used to verify the operation of the amplifier You may however find these tests helpful in troubles...

Page 32: ...Frequency Response Spec 3dB from 20 Hz to 200 Hz Procedure Load channels with 2 ohms Inject a 0 1Vrms 100 Hz sine wave Measure the output voltage This is your reference level Change the input frequenc...

Page 33: ...Measure the DC offset on each channel This level can be adjusted on for channel 1 by turning potentiometer R115 on the input board For channel 2 use potentiometer R215 Adjust the levels if necessary t...

Page 34: ...ect to a restocking fee and authorization from the Crown Parts Department must be obtained before returning parts for credit 5 2 2 Shipment Shipment will normally be made via UPS or best other method...

Page 35: ...the completed circuit board with all components assembled PWB stands for Printed Wire Board This is the circuit board only without components A6000GTi Power Supply PWA Number 134174 1 REV 6 PWA A6000...

Page 36: ...itial Release A6000GTI GATE DRIVE 2 PER AMP PWA Number 135041 1 REV A PWA A6000GTI GATE DRIVE Initial Release PWA Number 135041 1 REV B PWA A6000GTI GATE DRIVE Changed Q309 and Q319 to C7448 1 Changed...

Page 37: ...ply PWA NUMBER 134174 1 Schematic Sheet 1 2 A6000GTi Main PWA NUMBER 134258 1 Schematic Sheet 1 2 A6000GTi Front End PWA NUMBER 134254 1 Schematic Sheet 1 A6000GTi MPIP PWA NUMBER 134389 1 Schematic S...

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