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Schematics 10-1

130445-1 Rev. A

MA-2402 Service Manual

10 Schematics

The schematics referenced and provided are repre-
sentative only. There may be slight variations between
amplifier to amplifier. These schematics are intended
to be used for troubleshooting purposes only.

Summary of Contents for Macro-Tech 2402

Page 1: ...5 1000 U S A Telephone 219 294 8000 Trademark Notice PIP Grounded Bridge and SmartAmp are trademarks and Amcron Crown Macro Tech IOC ODEP and IQ System are registered trademarks of Crown International Inc Other trademarks are the property of their respective owners Models MA 2402 Some models may be exported under the name Amcron ...

Page 2: ...HIS EQUIPMENT TO RAIN OR MOISTURE The information furnished in this manual does not include all of the details of design production or variations of the equipment Nor does it cover every possible situation which may arise during installation operation or maintenance If you need special assistance beyond the scope of this manual please contact the Crown Technical Support Group Mail P O Box 1000 Elk...

Page 3: ...III 130445 1 Rev A MA 2402 Service Manual 2000 Crown International Inc Revision History Revision Number Date Comments Rev A 02 2000 Initial Printing ...

Page 4: ...MA 2402 Service Manual IV 130445 1 Rev A 2000 Crown International Inc This page intentionally left blank ...

Page 5: ...e Translators 4 2 4 4 2 Last Voltage Amplifiers LVAs 4 2 4 5 Grounded Bridge Topology 4 2 4 5 1 High Side HS 4 2 4 5 2 Low Side LS 4 3 4 6 Output Device Emulation Protection ODEP 4 4 5 Maintenance 5 1 5 1 Cautions and Warnings 5 1 5 2 General Information 5 1 5 3 Test Procedures 5 1 5 3 1 Turn On Delay 5 1 5 3 2 Output Bias Adjustment 5 1 5 3 3 ODEP Voltage Adjustment 5 1 5 3 4 DC Offset 5 2 5 3 5 ...

Page 6: ...Distortion IMD 5 4 5 3 16 Displays 5 4 5 3 17 Post Testing 5 4 6 Parts 6 1 6 1 General Information 6 1 6 2 Ordering and Receiving Parts 6 1 6 2 1 Terms 6 1 6 2 2 Shipment 6 1 7 Exploded View Parts 7 1 8 Module and Schematic Information 8 1 9 Module Parts 9 1 10 Schematics 10 1 Table of Contents ...

Page 7: ...fic features vary depending on model 1 3 Scope This Service Manual in intended to apply to all ver sions of the MA 2402 amplifier The Parts Listings in clude parts specific for the US version and the Euro pean version E13CE For parts specific only to other versions contact the Crown Technical Support Group for help in finding part numbers 1 4 Warranty Each Reference Manual contains basic policies ...

Page 8: ...MA 2402 Service Manual 1 2 Introduction 130445 1 Rev A 2000 Crown International Inc Figure 1 1 MA 2402 Front and Rear Views ...

Page 9: ...he circuit breaker that protects each power supply Indicators Enable An amber front panel indicator that shows the on off status of the low voltage power supply Signal IOC A green front panel indicator for each channel that flashes to show amplifier output If a channel s output waveform differs from its input by 0 05 or more the indicator flashes brightly to show distortion This function provides ...

Page 10: ...uction Steel chassis with durable black finish aluminum front panel with Lexan overlay and specially designed flow through ventilation from front to side panels Figure 2 4 Typical Crosstalk TEF 45 0 45 100 1 K 10 K 20 K FREQUENCY Hz 100 1 K 10 K 20 K FREQUENCY Hz dB TEF Figure 2 3 Typical Phase Response Cooling Internal heat sinks with forced air cooling for rapid uniform heat dissipation Dimensio...

Page 11: ...y Response Figure 2 6 Typical Damping Factor Figure 2 7 Typical Output Impedance 10 100 1 K 10 K 100 K FREQUENCY Hz 2 1 0 1 2 3 4 dB 5 6 7 4 ohm 8 ohm 1 watt 504 0 126 8 31 8 MILLIOHMS 8 0 2 0 6 dB 20 100 1 K 10 K 20 K 400 200 100 0 600 800 1000 1200 1400 FREQUENCY Hz 8 ohm 10 100 1 K 10 K 100 K FREQUENCY Hz 2 ohm ...

Page 12: ...MA 2402 Service Manual 2 4 Specifications 130445 1 Rev A 2000 Crown International Inc This page intentionally left blank ...

Page 13: ...age or frequency 3 Voltage Conversion 100 240 VAC 50 60 Hz Units These units have mult tap transformers that accept 100 120 220 230 or 240 VAC and 50 or 60 Hz power mains Jumpers are used to configure the power supplies for different voltages Note that the circuit breakers fuse fan motor and low voltage transformer may need to be changed to accommodate different voltages Refer to Figure 3 1 for Ma...

Page 14: ...MA 2402 Service Manual 3 2 Voltage Conversion 130445 1 Rev A 2000 Crown International Inc This page intentionally left blank ...

Page 15: ...icator for each channel which shows the reserve en ergy status and a SPI IOC indicator for each channel which indicates signal output and distortion In general the packaging of this model is designed for maximum watt price weight size value with user friendly features For additional details refer to the specification section or to the applicable Reference Manual 4 3 Front End Operation The front e...

Page 16: ...age Translator stage channels the signal to the Last Voltage Amplifiers LVA s in a balanced configura tion The LVA and LVA with their push pull effect through the Bias Servo drive the fully complementary output stage The LVAs are configured as common emitter amplifiers This configuration provides sufficient voltage gain and inverts the audio The polarity inver sion is necessary to avoid an overall...

Page 17: ...nduction output devices when off Flyback diodes shunt back EMF pulses from reactive loads to the power supply to protect output devices from dan gerous reverse voltage levels An output terminating circuit blocks RF on output lines from entering the am plifier through its output connectors 4 5 2 Low Side LS The Low Side LS operates quite differently The power supply bridge rectifier is not ground r...

Page 18: ...adjustable via potentiometer Flyback diodes perform the same function as the HS flybacks The output of the LS is tied directly to chassis ground via ground strap 4 6 Output Device Emulation Protection ODEP To further protect the output stages a specially devel oped ODEP circuit is used It produces a complex ana log output signal This signal is proportional to the al ways changing safe operating ar...

Page 19: ...IDE OUTPUT PNP STAGE POSITIVE HIGH SIDE OUTPUT NPN STAGE HIGH SIDE BIAS SERVO LVA 1 LVA 1 VOLTAGE TRANSLATOR VOLTAGE TRANSLATOR OUTPUT DEVICE EMULATION PROTECTION ERROR AMP VGS BGS BALANCED INPUTS INVERTING BRIDGE BALANCE LOW SIDE BIAS DIODE STRING 1 1 MAIN NEGATIVE FEEDBACK NFb LOOP Figure 4 3 Typical Crown Grounded Bridge Amplifier Basic Block Diagram One Channel Shown ...

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Page 21: ...over or panel 5 2 General Information The following test procedures are to be used to verify operation of this amplifier DO NOT connect a load or inject a signal unless directed to do so by the proce dure These tests though meant for verification and alignment of the amplifier may also be very helpful in troubleshooting For best results tests should be per formed in order All tests assume that AC ...

Page 22: ...ustment 5 3 6 Voltage Gain Spec 26 dB Gain Gain of 20 0 3 Spec 0 775V Sensitivity 10 Spec 1 4V Sensitivity 10 Procedure No load connected Inject a 0 775 VAC 1 kHz sine wave with the Sensitivity Switch in the 26 dB position Measure 15 5 VAC 0 5 VAC at the amplifier output Inject a 0 775 VAC 1 kHz sine wave with the Sensitivity Switch in the 0 775V position Measure 64 VAC 6 VAC at the amplifier outp...

Page 23: ...m Stereo 800W at 0 1 THD Spec at 2 Ohm Stereo 1050W at 0 1 THD International Spec at 8 Ohm Stereo 512W at 0 1 THD Spec at 4 Ohm Stereo 742W at 0 1 THD Spec at 2 Ohm Stereo 924W at 0 1 THD Procedure North America Load each channel to 8 ohms Inject a 1 kHz sine wave and measure at least 64 50 VAC at the output of each channel Load each channel to 4 ohms Inject a 1 kHz sine wave and measure at least ...

Page 24: ...dB FTC continuous average 20 Hz 20 kHz power 0 dB 01 35 dB 05 Procedure Load each channel to 8 ohms Inject a SMPTE standard IM signal 60 Hz and 7 kHz sine wave mixed at 4 1 ratio Set the 60 Hz portion of the signal for 50 8 Vrms output Set the 7 kHz portion to 25 With the IM analyzer measure less than 0 01 IMD Repeat the test at 35 dB reference 50 8 Vrms and measure less than 0 05 IMD 5 3 16 Displ...

Page 25: ...bill can be established after which an amount due will be issued and shipment made upon receipt of payment New parts returned for credit are subject to a restocking fee and authorization from the Crown Parts Department must be obtained before returning parts for credit 6 2 2 Shipment Shipment will normally be made via UPS or best other method unless you specify otherwise Shipments are made to and ...

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Page 27: ...s chapter includes a mechanical part list for this product All serviceable parts and assemblies will have a Crown Part Number CPN listed in this chapter The parts listed are current as of the date printed Crown reserves the right to modify and improve its products for the benefit of its customers 7 Exploded View Parts ...

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Page 29: ...MA 2402 Service Manual 130445 1 Rev A 2000 Crown International Inc Exploded View Parts 7 3 Figure 7 1 MA 2402 Chassis Assembly Top ...

Page 30: ... 8 SEE SECTION 8 SEE SECTION 3 A10094 5 A10086 70806 D8854 8 C9491 9 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 2 2 1 3 4 3 1 1 2 2 1 1 2 1 8 1 2 1 1 2 6 1 8 8 8 1 1 2 2 6 3 3 750D X 5 8ID BUSHING TERMINAL DUAL BINDING POST W HARDWARE BP MA2402 DOMESTIC BP MA2402 EXPORT E13 6 INT STAR WASHER BLACK SEMS 6 32 X 31 TORX PNHD STAR 6 32X 312 PAN HD T...

Page 31: ...MA 2402 Service Manual 130445 1 Rev A 2000 Crown International Inc Figure 7 2 MA 2402 Chassis Assembly Bottom Exploded View Parts 7 5 ...

Page 32: ... BTM PC SEMS 6 32 X 31 TORX PNHD STAR 8 18 X 1 375 PH PNHD ST SCR Z NYL THUMBSCREW WASHER PWA MA2402 MAIN 75 SPACER TOGGLE NUT PLASTIC OCB 500 SNAP BUSHING 6 32 X 56 HEX WSHR HD W T15 PWA OUTPUT HEATSINK OUTPUT DIODES INSULATOR THROUGH HOLE OUTPUT TENSION RETAINING BD SUPPORTS F12609 8 103433 70605 A10109 10822 D4137 2 SEE SECTION 8 C6914 3 A10192 1 A10315 1 SEE SECTION 8 F12019 0 125547 1 C6912 7...

Page 33: ...Identical Refer to figure 7 3 for Exploded View 1 2 3 4 5 6 7 8 9 1 24 6 2 2 2 2 2 6 INS 1 38 X 13 56 PAPER 6 32 X 312 PAN HD T15 TT TYPE W SJ7147 PNP PWR XSISTOR Q08 Q09 Q10 Q16 Q17 Q18 BRKT TO3P HEATSINK 2SA1186 PWR PNP T03P SANKEN Q07 Q15 CLIP TO3P MOUNTING HS COP 3 4 FINS 7 SOLDER 2SC2837 PWR NPN TO3P SANKEN Q03 Q11 SJ7148 NPN PWR XSISTOR Q04 Q05 Q06 Q12 Q13 Q14 D8867 0 C9491 9 C8188 2 D 7666 ...

Page 34: ...ption Part CPN 7 5 Cap Shelf Assembly Channel 1 and 2 are Identical Refer to figure 7 4 for Exploded View 1 2 3 4 5 3 1 1 1 1 6 32X 312 PAN HD T15 TT TYPE W CLIP MA2402 RECTIFIER SPRING PWA MA2402 PIP2 CAP RECT SHELF MA2402 CAP RECT TAPE KAPTON POLYIMIDE 1 2 IN C9491 9 127467 1 SEE SECTION 8 127111 1 S6251 3 Figure 7 4 MA 2402 Cap Shelf Assembly ...

Page 35: ... to figure 7 5 for Exploded View Item Quantity Description Part CPN Figure 7 5 MA 2402 Fan Assembly 1 2 3 4 5 6 7 2 1 2 1 1 1 1 6 32 X 5 16 UNDERCUT FLTHD MSCR BRACKET FAN 6 32 X 312 PAN HD T15 TT TYPE W XMOTOR FAN BLADE 4 5 INCH CCW LBL 1A 05A FUSE REPLACEMENT LBL FAN VOLTAGE DOMESTIC C7062 0 D8439 8 C9491 9 SEE SECTION 3 C9938 9 D7340 9 127516 1 ...

Page 36: ...ntity Description Part CPN 7 7 Standard PIP Assembly Refer to figure 7 6 for Exploded View Figure 7 6 Standard PIP Assembly 1 2 3 4 5 6 2 1 1 2 2 4 8 X 1 4 6 PNHD PH BZ PWA PIP2FXQ PANEL PIP2FXQ PHONE JACK HARDWARE INCLD W PHONE JACK PHONE JACK HARDWARE INCLD W PHONE JACK M3 X 5 X 7MM PN HD BLK NYLOK C 7161 0 127210 1 127234 1 A10330 9 ...

Page 37: ...e Board This is the circuit board only without components 8 2 MA 2402 Modules 8 2 1 Cap Rectifier PWA 127100 2 Cap Rectifier PWA on 127101 2 PWB 8 2 2 Display PWA 127177 2 Display PWA on 127176 2 PWB 8 2 3 Main PWA 127245 3 Main PWA on 125414 3 PWB 8 2 4 Output PWA left and right are identical 102774 1 Output PWA on 102770 1 PWB 8 2 5 Relay PWA Ch 1 127476 1 Domestic Relay PWA on 127199 1 PWB 1272...

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Page 39: ...wn Part Number CPN listed in this chapter The parts listed are current as of the date printed Crown reserves the right to modify and improve its products for the benefit of its customers Please note where refer ence designations are listed as installed on next as sembly the CPN Crown Part Number for the associ ated part may be found in Section 7 Exploded View Parts 102774 2 127100 2 127177 2 12720...

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Page 45: ...MA 2402 Service Manual 130445 1 Rev A 2000 Crown International Inc Module Parts 9 7 102774 2 PWA Component Map Component Side ...

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Page 89: ...rnational Inc 10 Schematics 102773 127108 127175 127198 127252 127494 The schematics referenced and provided are repre sentative only There may be slight variations between amplifier to amplifier These schematics are intended to be used for troubleshooting purposes only ...

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Summary of Contents for Macro-Tech 2402

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