Arcam PA240 Service Manual
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Arcam PA240 Service Manual

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SERVICE MANUAL
POWER AMPLIFIER
ISSUE A
PA240

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Summary of Contents for Arcam PA240

  • Page 1 SERVICE MANUAL POWER AMPLIFIER ISSUE A PA240...
  • Page 2 Revision History Issue A - Initial release EN-2...

  • Page 3: Table Of Contents

    Electrostatic Discharge (ESD) Precautions EN-7 L283 PSU PCB Issue 1 EN-40 General Information EN-8 L308 Lifter PCB Issue 1 EN-44 PA240 Specifications EN-9 L285 Front Panel PCB Issue 1 EN-49 Functional Verification and Test Procedure EN-10 Overall Dimensions EN-52 Troubleshooting...

  • Page 4: Safety Summary

    Safety Summary The following general safety precautions must be observed during all phases of operation, service, and repair of this unit. Failure to comply with these precautions or with specific warnings elsewhere in these instructions violates manufacturer safety standards and intended use of this unit. Harman Luxury Audio Group assumes no liability for failure to comply with these requirements. DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the unit in the presence of flammable gasses or fumes.

  • Page 5: Safety Guidelines

    Safety Guidelines Read these instructions. Refer all servicing to qualified service personnel. Objects have fallen, or liquid has spilled into the Warning equipment, or Keep these instructions. Servicing is required when the apparatus has been Mains plug/appliance coupler is used to disconnect damaged in any way, such as power-supply cord or The equipment has been exposed to rain, or device and it shall remain readily operable.
  • Page 6 WEEE directive requirements. Modification not expressly approved by contact with the unit. ARCAM may void your authority, granted by the FCC, to Correct disposal of this product Never disassemble or modify the unit in any way. use the product.

  • Page 7: Electrostatic Discharge (Esd) Precautions

    Electrostatic Discharge (ESD) Precautions Keep circuit boards in their original packing until ready for use. Avoid having plastic, vinyl or styrofoam in the working area. Wear an anti-static wrist strap. Discharge personal static before handling circuit boards. Remove and insert circuit boards with care When removing circuit boards, handle only by non-conductive surfaces.

  • Page 8: General Information

    General Information The PA240 is a high-performance power amplifier that delivers 2 channels of efficient Class G amplification. With an impressive 380W per channel, the PA240 is designed to offer the greatest flexibility and power without compromising on control. Featuring the best-in-class components including a toroidal based power supply, acoustically damped chassis, paralleled transistor output stages and exceptionally low levels of distortion, the PA240 masters the reproduction of music with all its originality and detail for an unmatched level of sound quality and clarity.

  • Page 9: Pa240 Specifications

    Weight (net) 18kg Weight (gross) 19.7kg All specification values are typical unless otherwise stated. Arcam has a policy of continuous improvement for its products. This means that designs and specifications are subject to change without notice. E&OE. EN-9...

  • Page 10: Functional Verification And Test Procedure

    Functional Verification and Test Procedure Check mains power consumption at idle (no inputs or loads connected) Mode should be set to ST. Check THD into 4R (XLR input) Input should be set to RCA. 4R load – balanced feed to analyser input. Gain should be set to 31dB.
  • Page 11 Check maximum output level (XLR jack) Switch to XLR input with rear panel switch. Double AP output signal level. THD should be < 0.01%, typically 0.002%. Check all other channel. Check short circuit protection Set input level to get approx. 3V on the speaker output. Short one of the outputs.

  • Page 12: Troubleshooting

    The PA720 / PA240 / PA410 power amplifier is correctly plugged in and switched on. Your audio/video source (e.g. pre amplifier) is correctly connected. The PA720 / PA240 / PA410 is not in protection mode, as described in the next section. The PA720, PA240 and PA410 is not muted.

  • Page 13: Theory Of Operation

    • Balanced (XLR) audio inputs. level required by the amplifier • Single ended (RCA) audio inputs. Host MCU The host MCU IC300 controls all the functions of the PA240 such as input type selection, muting, controlling EN-13...

  • Page 14: L288 Pre Amplifier Pcb Issue 3

    L288 Pre Amplifier PCB Issue 3 EN-14 EN-14...
  • Page 15 Part Number L288AY 23425 Part Description Issue AMP024 Input PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Input PCB Assembly Part Number Quantity Description Issue Designators 1A022 Resistor 1206 Surface Mount 0.25W 1% 22R R175 1A210 Resistor 1206 Surface Mount 0.25W 1% 1K0 R179 R315 R318 1A310...
  • Page 16 Part Number L288AY 23425 Part Description Issue AMP024 Input PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Input PCB Assembly Part Number Quantity Description Issue Designators 1N247 Resistor 0603 Surface Mount 0.063W 1% 4K7 R130 R134 R143 R152 R160 R168 R322 1N310 Resistor 0603 Surface Mount 0.063W 1% 10K R111 R226 R300 R302 R306 R307 R321 R326 R7 R8...
  • Page 17 Part Number L288AY 23425 Part Description Issue AMP024 Input PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Input PCB Assembly Part Number Quantity Description Issue Designators 2RX610 Capacitor Low Impedance Radial Electrolytic 5mm Dia C101 C102 C103 C104 C110 C111 C112 C113 C145 5mm Pitch 10UF 50V - RoHS OK C146 2RX647...
  • Page 18 Part Number L288AY 23425 Part Description Issue AMP024 Input PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Input PCB Assembly Part Number Quantity Description Issue Designators 5HMX795F512L IC Microprocessor PIC32MX795F512L TQFP 100 IC300 package 5N2001 IC ESD Protection TPD2E001DZDR SOP-4 Package IC202 5N3232E IC RS232 Charge Pump Driver MAX3232ECWE Static...
  • Page 19 Part Number L288AY 23425 Part Description Issue AMP024 Input PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Input PCB Assembly Part Number Quantity Description Issue Designators 8K8308 Con 1.00MM Vertical SM FFC 8WAY CON3 8K8330 Con 1.00MM Vertical SM FFC 30WAY CON5 8K8520 Con 1.00MM Vertical FFC 20WAY 52806 Series...
  • Page 20 Dia 3.2mm Dia 3.2mm FIX1 FIX2 DRAWING TITLE 20_E050 16/12/20 Add R2, fit R3 AMP024 Top Level 20_E038 08/09/20 None to this sheet ARCAM Filename: L288 CT1 Top Level.SchDoc 19_E040 02/12/19 PCB change only 0W063 0W063 0W063 0W063 Notes: 19_E027...
  • Page 21 G6K-2F-TR DC12 R180 DRAWING TITLE 20_E050 16/12/20 None to this sheet AMP024 Inputs AGND 0W125 20_E038 08/09/20 Change RCA sockets to black P188 ARCAM Filename: L288 CT2 Input.SchDoc 19_E040 02/12/19 PCB change only C146 DZ100 10UF BZX84C Notes: 19_E027 17/04/19 Correct RCA inputs A &...
  • Page 22 C222 P239 DRAWING TITLE 20_E050 16/12/20 None to this sheet AMP024 Network L206 20_E038 08/09/20 None to this sheet 220R@100MHz ARCAM DGND Filename: L288 CT3 Net.SchDoc 19_E040 02/12/19 PCB change only P240 DGND Notes: 19_E027 17/04/19 Fit 33pF caps on RMII signals, add 120pF to XTAL, PA SHORT moved CH GND A &...
  • Page 23 SCR1 SW300B SCR2 SKU: OS102011MA1QN1 0 - Arcam +3V3 MCU R301 1 - Lexicon SCR1 DEBUG DGND R300 SW301B SCR2 +3V3 MCU CON300 0W063 0W063 OS102011MA1QN1 BLACK ICD pin 2 DEBUG CLK P301 SCR1 SW302B RED ICD pin 3 DEBUG DATA...

  • Page 24: L292 Power-Amplifier Pcb Issue 3

    L292 Power-Amplifier PCB Issue 3 EN-24 EN-24...
  • Page 25 Part Number L292AY 23425 Part Description Issue AMP024 Amplifier PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Amplifier PCB Assembly Part Number Quantity Description Issue Designators 1A033 Resistor 1206 Surface Mount 0.25W 1% 33R R1037 R1053 R3037 R3053 1A068 Resistor 1206 Surface Mount 0.25W 1% 68R R1001 R1098 R3001 R3098...
  • Page 26 Part Number L292AY 23425 Part Description Issue AMP024 Amplifier PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Amplifier PCB Assembly Part Number Quantity Description Issue Designators 1M010 Resistor 0805 Surface Mount 0.125W 1% 10R R1020 R1022 R1079 R3020 R3022 R3079 R530 R533 1M022 Resistor 0805 Surface Mount 0.125W 1% 22R R1005 R1091 R3005 R3091...
  • Page 27 Part Number L292AY 23425 Part Description Issue AMP024 Amplifier PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Amplifier PCB Assembly Part Number Quantity Description Issue Designators 1N020 Resistor 0603 Surface Mount 0.063W 1% 20R R1078 R3078 1N047 Resistor 0603 Surface Mount 0.063W 1% 47R R1019 R1097 R3019 R3097...
  • Page 28 Part Number L292AY 23425 Part Description Issue AMP024 Amplifier PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Amplifier PCB Assembly Part Number Quantity Description Issue Designators 1N610 Resistor 0603 Surface Mount 0.063W 1% 10M0 R606 R607 R608 R609 R616 R617 R618 R619 R626 R627 R628 R629 1N847 Resistor 0603 Surface Mount 0.063W 1% 4R7...
  • Page 29 Part Number L292AY 23425 Part Description Issue AMP024 Amplifier PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Amplifier PCB Assembly Part Number Quantity Description Issue Designators 2KA447 Capacitor Boxed Polyester 5mm Pitch 5% 100VDC 470N C1000 C3000 2KD410 Capacitor Boxed Polyester EPEM 5mm Pitch 5% 100VDC C1 C2 C4 C5...
  • Page 30 Part Number L292AY 23425 Part Description Issue AMP024 Amplifier PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Amplifier PCB Assembly Part Number Quantity Description Issue Designators 2U610 Capacitor Non-Polar Radial Electrolytic 10UF 63V - This C501 C502 part is RoHS compliant.
  • Page 31 Part Number L292AY 23425 Part Description AMP024 Amplifier PCB Assembly Issue 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Amplifier PCB Assembly Part Number Quantity Description Issue Designators 4A856BD Transistor Dual PNP BC856BD SOT-363 Package RoHS TR1003 TR1005 TR1019 TR1022 TR3003 TR3005 TR3019 TR3022 4A857B Transistor BC857B SOT23 Package...
  • Page 32 Part Number L292AY 23425 Part Description Issue AMP024 Amplifier PCB Assembly 3.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Amplifier PCB Assembly Part Number Quantity Description Issue Designators 5B4562 Opamp LM4562 SOIC-8 Package IC1001 IC3001 5B8542TI Opamp TLV8542 SO-8 package IC600 IC601 IC602 IC603 5S412DY IC Quad Analogue Switch DG412DY SO-16 Package...
  • Page 33 Blank PCB L292PB AMP024 AMP PCB DRAWING TITLE 20_E002 06/01/20 PCB change only AMP024 Top Level 19_E040 03/12/19 PCB change only ARCAM Filename: L292 CT1 Top Level.SchDoc 19_E035 08/11/19 None to this sheet Notes: 19_E027 17/05/19 None to this sheet A &...
  • Page 34 100N 100N SPK ON CON1000 100V FIX1001 FIX1002 FIX1003 FIX1004 FIX1000 FIX1005 FIX1006 FIX1007 ARCAM Filename: L292 CT2 L Channel.SchDoc 19_E035 08/11/19 Change R1100 to 300k 0W063 0W063 Notes: 19_E027 17/05/19 Add CON1000 for production testing, change R1041, 1048 -14V...
  • Page 35 1206 -VLIFT DRAWING TITLE 20_E002 06/01/20 PCB change only AMP024 Amp L Output 19_E040 03/12/19 PCB change only ARCAM Filename: L292 CT3 L Channel Output.SchDoc 19_E035 08/11/19 None to this sheet Notes: 19_E027 17/05/19 None to this sheet A & R Cambridge Ltd.
  • Page 36 AMP024 Pre Driver R AGND 19_E040 03/12/19 PCB change only C3041 C3042 C3043 10UF 100N 100N ARCAM Filename: L292 CT4 R Channel.SchDoc 19_E035 08/11/19 Change R3049 to 300k Notes: 19_E027 17/05/19 Change R3041, 3048 -14V A & R Cambridge Ltd.
  • Page 37 1206 -VLIFT DRAWING TITLE 20_E002 06/01/20 PCB change only AMP024 Amp R Output 19_E040 03/12/19 PCB change only ARCAM Filename: L292 CT5 R Channel Output.SchDoc 19_E035 08/11/19 None to this sheet Notes: 19_E027 17/05/19 None to this sheet A & R Cambridge Ltd.
  • Page 38 P541 DRAWING TITLE 20_E002 06/01/20 PCB change only C514 AMP024 Protection 100UF 19_E040 03/12/19 PCB change only R534 P542 P543 ARCAM Filename: L292 CT6 Protection.SchDoc 19_E035 08/11/19 None to this sheet P544 100R -30V -14V TR507 Notes: 19_E027 17/05/19 None to this sheet...
  • Page 39 +14V DGND +3V3 +3V3 DRAWING TITLE 20_E002 06/01/20 PCB change only AMP024 Bias Circuit 19_E040 03/12/19 PCB change only ARCAM DGND DGND Filename: L292 CT7 Bias Circuit.SchDoc 19_E035 08/11/19 None to this sheet Notes: 19_E027 17/05/19 None to this sheet...

  • Page 40: L283 Psu Pcb Issue 1

    L283 PSU PCB Issue 1 EN-40 EN-40...
  • Page 41 Part Number L283AY 23425 Part Description Issue AMP019 Mains Input PCB Assembly 1.0.0 Bill of Materials Report Type Fitted Parts Only AMP019 Mains Input PCB Assembly Part Number Quantity Description Issue Designators 1KA522 Resistor Metal Glazed 0.5W 5% 2M2 1M210 Resistor 0805 Surface Mount 0.125W 1% 1K0 R8015 R8016 1N222...
  • Page 42 Part Number L283AY 23425 Part Description Issue AMP019 Mains Input PCB Assembly 1.0.0 Bill of Materials Report Type Fitted Parts Only AMP019 Mains Input PCB Assembly Part Number Quantity Description Issue Designators 8K2308 Con Minifit HCS 8WAY CON5 8K3406 Con JST PH Series Vertical 6WAY CON3 8K3802 CON JST VH V 2W...
  • Page 43 Filename: C8005 R8015 PA TEMP T2 18_E007 04/01/2019 Mains selector switch changed to A1404 100N Filename: Vout C8007 ARCAM L283 AMP019 CT1 Mains Input.SchDoc 18_E048 28/11/18 No changes to this sheet 0W125 100N DGND T2 Notes: 18_E037 01/10/2018 Change PSU to encapsulated type A &...

  • Page 44: L308 Lifter Pcb Issue 1

    L308 Lifter PCB Issue 1 EN-44...
  • Page 45 Part Number L308AY 23425 Part Description AMP024 Lifter PCB Assembly Issue 1.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Lifter PCB Assembly Part Number Quantity Description Issue Designators 1A010 Resistor 1206 Surface Mount 0.25W 1% 10R R78 R79 1A033 Resistor 1206 Surface Mount 0.25W 1% 33R R76 R81...
  • Page 46 Part Number L308AY 23425 Part Description Issue AMP024 Lifter PCB Assembly 1.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Lifter PCB Assembly Part Number Quantity Description Issue Designators 2JC310 Capacitor SM 0603 X7R Ceramic 10% 50V 10N C23 C25 2JC410 Capacitor SM 0603 X7R Ceramic 10% 50V 100N 2JK510...
  • Page 47 Part Number L308AY 23425 Part Description Issue AMP024 Lifter PCB Assembly 1.0.0 Bill of Materials Report Type Fitted Parts Only AMP024 Lifter PCB Assembly Part Number Quantity Description Issue Designators 5MLM19 IC Analogue thermal sensor Natsemi LM19 TO-92 IC1 IC2 Package 7F013 Ferrite Bead SM0603 120R@100MHz...
  • Page 48 C5 and C6 fitted, R5 changed to 330R MMBTA56L AMP024 Lifter TOOL1 TOOL2 19_E007 03/01/2019 C11 and C19 parts changed, Net name changes, NF C5,C6 100K N LIFT OFF TOOL3 TOOL4 ARCAM Filename: L308 CT1 Lifter.SchDoc 18_E048 28/11/18 No changes to this sheet 0W063 Notes: 18_E023 01/08/18...

  • Page 49: L285 Front Panel Pcb Issue 1

    L285 Front Panel PCB Issue 1 EN-49...
  • Page 50 Part Number L285AY 23425 Part Description Issue AMP019 Front Panel PCB Assembly 1.0.0 Bill of Materials Report Type Fitted Parts Only AMP019 Front Panel PCB Assembly Part Number Quantity Description Issue Designators 1N210 Resistor 0603 Surface Mount 0.063W 1% 1K0 R1 R2 R4 3D041 LED SM RGB 1.6x1.6mm...
  • Page 51 19_E027 15/08/19 No changes to this sheet AMP019 Display Filename: 19_E007 20/03/19 No changes to this sheet Filename: ARCAM L285 CT1 Front Panel.SchDoc 18_E048 28/11/18 No changes to this sheet Notes: 18_E023 13/08/18 Fit white LED A & R Cambridge Ltd.

  • Page 52: Overall Dimensions

    Overall Dimensions EN-52...
  • Page 53 A & R CAMBRIDGE LTD DATE: LINEAR TOLERANCE 0.2MM ALL DIMENSIONS IN CHECKED BY: UNLESS OTHERWISE STATED MILLIMETERS UNLESS ANGULAR TOLERANCE 1 OTHERWISE STATED ORIGINAL SCALE 1:2.5 UNLESS OTHERWISE STATED MATERIAL: FINISH: PART NUMBER AND DRAWING NUMBER PA240 DRAWING TITLE PA240 ASSEMBLY EN-53...

  • Page 54: Exploded Drawings

    Exploded Drawings EN-54...
  • Page 55 NEW COVER & LIFTER PCB Nos E.0.0 MCM ITEM No. PART No. DESCRIPTION QTY. E553AY - See NEXT SHEET FASCIA ASSY - PA240 TGP3863 / VKC2A211B131 COVER - HDA AVR10/20/30 + PA AMPs HA4V06B TORX SCREW M4 x 6 BLACK 23425...
  • Page 56 BADGE METAL - PA240 F348 MAINS BUTTON SPRING - SOLO UNO See DISPLAY PCB ASSY MAINS SW PACKER PCB See DISPLAY PCB ASSY MAINS SW PCB ASSY - PA240 / PA720 H042 HEX PILLAR M3 x 6mm M/F 23425 DRAWN BY: 9-10-2018 DATE: A &...
  • Page 57 INSULATOR - A49 PSU H067 THREADED PCB SUPPORT M3x60mm L288AY INPUT PCB ASSY - PA240 L184CA FFC - INPUT to DISPLAY PA240 / PA720 HF4V09B SCREW SPECIAL No.4x9 HA3A08B M3x8mm SUPA PAN HEAD BLACK HB3A10B Taptite Pan Supa M3x10mm Black...
  • Page 58 E854CH from CUA1A324 CHASSIS - A49 & C49 TGP3544 / CKL1A201 FOOT - AVR TGP3525 / CHG1A483 CUSHION FOOT L190CA FFC - INPUT PA240 / PA720 POWER AMP ASSY - HA10C120A M10x120 COACH BOLT SEE OTHER SHEET HJ10A00F M10 NYLOC NUT...
  • Page 59 LIFTER PCB BRACKET - AVR ( HL4CA ) IF REQUIRED M4 WASHER E156MC INSULATOR - HEATSHUNT - A49 E822MI INSULATOR - POWER AMP - PA240 / PA720 TGP3653 / CMD1A784 (CMY1A397) LIFTER HEATSHUNT BAR - AVR HA3V20A SCREW M3x20 HF4V09B SCREW SPECIAL No.4x9...
  • Page 60 WWW.ARCAM.CO.UK THE WEST WING, STIRLING HOUSE WATERBEACH, CAMBRIDGESHIRE, CB25 9PB +44 (0) 1223 203200...

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