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Cambridge Audio 651A Service Manual

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651A
Specifications
Power output
THD (unweighted)
power
Frequency response (-1dB)
S/N ratio (ref 1W)
Input impedances
Power Amp damping factor
Max. power consumption
Standby power consumption
Bass/Treble controls
USB input
USB maximum current rating
Dimensions (H x W x D)
Weight
Service Manual

Technical specifications

75 watts (into 8Ω)
<0.002% @ 1kHz, 80% of rated power
<0.03% 20Hz - 20kHz, 80% of rated
<0.02% 20Hz - 20kHz @ 10W
5Hz - 50kHz
>92dB (unweighted)
47kohms
>100
600W
<0.5W @ rated mains
Shelving, ultimate boost/cut
+/- 7.5dB @ 20Hz and 20kHz
USB Audio 1.0
16 bit 32kHz, 44.1kHz, 48kHz.
500mA
120 x 430 x 350mm
(4.7 x 16.9 x 13.8")
8.4kg (18.5lbs)
Amended Aug 2013 to include APD variant model

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Summary of Contents for Cambridge Audio 651A

  • Page 1: Technical Specifications

    Amended Aug 2013 to include APD variant model Service Manual 651A Specifications Technical specifications Power output 75 watts (into 8Ω) THD (unweighted) <0.002% @ 1kHz, 80% of rated power <0.03% 20Hz - 20kHz, 80% of rated power <0.02% 20Hz - 20kHz @ 10W...

  • Page 2: Table Of Contents

    All trademarks and registered trademarks are the property of their respective owners. © Copyright Cambridge Audio Ltd 2013. Cambridge Audio and the Cambridge Audio logo are trademarks of Cambridge Audio.

  • Page 3: Safety Instructions

    (2009/125/EC) Directives when used and installed according to this at plugs, convenience receptacles and the point where they exit from instruction manual. For continued compliance only Cambridge Audio the apparatus. accessories should be used with this product and servicing must be 11.
  • Page 4 Cambridge Audio product, Positioning it can be returned by your dealer to Cambridge Audio or an authorised Cambridge Audio service agent. You will need to ship this product in either Choose the installation location carefully. Avoid placing it in direct sunlight its original packaging or packaging affording an equal degree of or close to a source of heat.

  • Page 5: Rear Panel Connections

    651A Service Manual azur 651A Front panel controls Standby/On Volume Switches the unit between Standby mode (indicated by dim power LED) Use to increase or decrease the level of the sound from the outputs of the and On (indicated by bright power LED). Standby is a low power mode amplifier.

  • Page 6: Front Panel Controls

    Note: When using two pairs of speakers, use speakers with a minimum nominal impedance of 8 ohms. A USB B type socket is fitted to the 651A to enable the playback of audio from a personal computer running either Microsoft Windows or Apple Mac IR (Infrared) Emitter In OS X operating systems.

  • Page 7: Exploded Diagram

    651A Service Manual Exploded Diagram...

  • Page 8: Spares Table

    TOROID TR. 230VAC@50Hz TI-073322 NORATEL FOR 650A/651A TOROID TR. 115VAC@60Hz TI-073324 NORATEL FOR 650A/651A PY1482 3200-073324E000 PY1597 9465-015000E041 Azur 550A/650A/651A Front Panel CONTROL BOARD ASSY (TWO BOARDS) PF427 Azur 651A Preamp+MCU BOARD ASSY REV A PY1599 9465-015000E311 Azur 550A/650A/651A VOLUME BOARD ASSY REV A...

  • Page 9: Front Panel Pcb Schematic

    651A Service Manual Front Panel PCB Schematic Table...

  • Page 10: Front Panel Pcb Layout

    Front Panel PCB Layout...

  • Page 11: Front Panel Pcb Bom

    651A Service Manual Cambridge Audio 651A Front Panel PCB BOM 651A Front Panel PCB BOM Factory Part Value Description/Type Component Ident ManPN Tolerance PackageInfo AP Part Number Number RESISTORS 1/4W Metal Film R5, R6 10mm Pitch 220R 1/4W Metal Film...

  • Page 12: Input Pcb Schematic

    Input PCB Schematic...
  • Page 13 651A Service Manual...

  • Page 14: Input Pcb Layout

    Input PCB Layout Cambridge Audio 651A Input PCB Layout...

  • Page 15: Input Pcb Bom

    651A Service Manual Cambridge Audio 651A Azur 651A Input PCB BOM Value Description/Type Component Ident ManPN Tolerance PackageInfo Factory Part Number AP Part Number RESISTORS 100R 1/4W Metal Film R5, R16, R17 10mm Pitch 220R 1/4W Metal Film 10mm Pitch...
  • Page 16 Cambridge Audio 651A 1000uF 35V Electrolytic C11, C13, C14 13mm Dia DIODES D1-D8, D11,D14, 400V 1A Rectifier 1N4004 DO41 D9,D12 Link DO41 24 AWG DO41 Not Populated 75V 150mA Signal Diode D10, D15, D16 1N4148 D035 INTEGRATED CIRCUITS -15V 1A...

  • Page 17: Preamp Pcb Schematic

    651A Service Manual Preamp PCB Schematic...
  • Page 19 651A Service Manual...

  • Page 20: Preamp Pcb Layout

    Preamp PCB Layout...

  • Page 21: Preamp Pcb Bom

    651A Service Manual Preamp PCB BOM 651A Preamp PCB BOM Factory Part Value Description/Type Component Ident ManPN Tolerance PackageInfo AP Part Number Number RESISTORS 1/4W Metal Film 10mm Pitch 1/4W Metal Film R14, R15 10mm Pitch 1/8W Metal Film R38, R49 7.5mm Pitch...
  • Page 22 10nF 50V Ceramic C40, C66, C67 2.5mm Pitch 1100-103043-000 C1, C2, C4, C7, C19, C20, C24, 47nF 63V Met. Polyester 5mm Pitch Box 1117-473053E000 C26, C36, C37, C47, C53 CMPA104K100RB07 7.5mm Pitch 100nF 100V Polypropylene C14, C16 1114-104063E000 C55, C60, C62, 100nF 50V Mono Ceramic 5mm Pitch...

  • Page 23: Protection Pcb Schematic

    651A Service Manual Protection PCB Schematic...

  • Page 24: Protection Pcb Layout

    Protection PCB Layout Cambridge Audio 651A...

  • Page 25: Protection Pcb Bom

    651A Service Manual Protection PCB BOM 651A Protection PCB BOM Factory Part Value Description/Type Component Ident ManPN Tolerance PackageInfo AP Part Number Number RESISTORS 0805 Thick Film R74, R103 R95, R96, R116, 0805 Thick Film R122 R92, R94, R97, 100k...

  • Page 26: Speaker Pcb Schematic

    Speaker PCB Schematic...
  • Page 27 651A Service Manual For soldering the wires please copy sample...

  • Page 28: Speaker Pcb Layout

    Cambridge Audio 651A Speaker PCB Layout Speaker PCB Layout...

  • Page 29: Speaker Pcb Bom

    651A Service Manual Speaker PCB BOM 651A Speaker PCB BOM Factory Part Value Description/Type Component Ident ManPN Tolerance PackageInfo AP Part Number Number RESISTORS 1/4W Metal Film 10mm Pitch 1/8W Metal Film 7.5mm Pitch 1/2W Carbon R1, R2 12mm Pitch...

  • Page 30: Power Amp Pcb Schematic

    Power AMP PCB Schematic...
  • Page 31 651A Service Manual...
  • Page 33 651A Service Manual...

  • Page 35: Power Amp Pcb Layout

    651A Service Manual Power AMP PCB Layout...

  • Page 36: Power Amp Pcb Bom

    Power AMP PCB BOM 651A Power Amp PCB BOM Factory Part Value Description/Type Component Ident ManPN Tolerance PackageInfo AP Part Number Number RESISTORS R27, R65, R78, 0.22R 3W Wirewound 20mm Pitch 1072-208330E000 Raise off PCB R113 3W WireWound R28, R66...
  • Page 37 651A Service Manual No Stuff Met. Polyester C17, C35 5mm Pitch Box No Stuff 10pF 50V NP0 Ceramic C8, C31 2.5mm Pitch 1181-100042-000 100pF 50V NP0 Ceramic C7, C32 2.5mm Pitch 1181-101042-000 1nF 63V Polypropylene C4, C13, C14, C49 5mm Pitch Box...

  • Page 38: Mains Pcb (Eu) Schematic

    Mains PCB (EU) Schematic...

  • Page 39: Mains Pcb (Eu) Bom

    651A Service Manual Mains PCB (EU) BOM 651A EU 230V Mains PCB BOM Value Description/Type Component Ident ManPN Tolerance PackageInfo Factory Part Numer AP Part Number RESISTORS 1/8W Metal Film 7.5mm Pitch 1/8W Metal Film 7.5mm Pitch CAPACITORS 1nF 400V...

  • Page 40: Mains Pcb (Cu) Schematic

    Mains PCB (CU) Schematic...

  • Page 41: Mains Pcb (Cu) Bom

    651A Service Manual Mains PCB (CU) BOM 651A Mains CU 115V PCB BOM Value Description/Type Component Ident Manufacturer ManPN Tolerance PackageInfo Yanion P/N NOTES RESISTORS 1/8W Metal Film 7.5mm Pitch 1/8W Metal Film 7.5mm Pitch CAPACITORS C & C 1nF 400V...

  • Page 42: Mains Pcb Layout

    Mains PCB Layout Cambridge Audio 651A Mains PCB Layout...

  • Page 43: Usb Input Audio Pcb Schematic

    Cambridge Audio 651A 651A Service Manual USB Input Audio PCB Schematic USB Input Audio PCB Schematic...

  • Page 44: Usb Input Audio Pcb Layout

    Cambridge Audio 651A USB Input Audio PCB Layout...

  • Page 45: Usb Input Audio Pcb Bom

    651A Service Manual Cambridge Audio 651A USB Input Audio PCB BOM Value Description/Type Component ManPN Tolerance PackageInfo Factory Reference Service Part Ident Number Number RESISTORS 0603 Thick Film R14, R25 0603 No Fit R26, R36 0603 Thick Film R15, R16...
  • Page 46 Cambridge Audio 651A INTEGRATED CIRCUITS 34 PCM2704 16-BIT, PCM2704DB SSOP 28 32/44.1/48-kHz STEREO DAC WITH USB 35 2k EEPROM 24LC02B-I/OT SOT23-5 Preload with AP30822/X HEX code Buffer IC 74HC1G125GW SOT-353 Dual Audio Op NE5532D SOIC08 38 IP4220 USB ESD IP4220CZ6...

  • Page 47: Ic Details

    651A Service Manual IC Pin Layouts for the Cambridge Audio Azur 550A/650A Amplifier Input PCB BC327 (Q1) NE5532 (U4, U7, U8, U9, U10, U11 & U12) 7915 (U1) 7805 (U3) 7815 (U2)
  • Page 48 IC Pin Layouts for the Cambridge Audio Azur 550A/650A Amplifier TC9163AF (U5) RC4580P (U6) Preamp PCB BC327 (Q2) BC337 (Q3) NE5532 (U3, U4, U5 & U6)
  • Page 49 651A Service Manual IC Pin Layouts for the Cambridge Audio Azur 550A/650A Amplifier RC4580P (U1 & U2) PIC16F882 (U7) BA6218 (U8) Power Amp PCB 2SC2240GR (Q1, Q6, Q7, Q9, Q10, Q15, Q19, Q20, Q23, Q24, Q26 & Q32)
  • Page 50 IC Pin Layouts for the Cambridge Audio Azur 550A/650A Amplifier MPSA92 (Q3, Q8, Q25, Q28, Q29 (650A ONLY) Q30, Q34, Q35, Q36, Q38, Q41 & Q46) 2SA970GR (Q2, Q4, Q5, Q11, Q14, Q16, Q21, Q22, Q27 & Q29) MPSA42 (Q12, Q13, Q17, Q18, Q31, Q37 & Q40)
  • Page 51 651A Service Manual IC Pin Layouts for the Cambridge Audio Azur 550A/650A Amplifier STD03NY (U2 & U4) Mains PCB MPSA14 (Q3) Front Panel PCB BC337 (Q1) M74HC4094B1R (U2)
  • Page 52 IC Pin Layouts for the Cambridge Audio Azur 550A/650A Amplifier TSOP34836 (U1) Speaker PCB BC337 (Q1) BC327 (Q4) CD4011BE (U1) OP4N25 (U2) TSOP34836 (U3)
  • Page 53 651A Service Manual IC Pin Layouts for the Cambridge Audio Azur 550A/650A Amplifier LM393AP (U4) BC337 (Q1) MPSA14 (Q2 & Q3) Volume PCB NE5532D (U1 & U2) Protection PCB NE5532D (U5)
  • Page 54 IC Pin Layouts for the Cambridge Audio Azur 550A/650A Amplifier LM393D (U6)

  • Page 55: Revised Part Table And Explanation Of Apd Changes

    Azur 650A/651A Volume Pot Skirt (Black ) AP21554A not shown PZ166 Azur 650A/651A Tone Pot Skirt (Silver) AP21555A not shown PZ167 Azur 650A/651A Tone Pot Skirt (Black ) AP21555A not shown PF572 Azur 651A SWITCHED MODE POWER SUPPLY not shown PF573...

  • Page 56: Input Pcb Schematic With Apd

    Input PCB Schematic with APD...
  • Page 57 651A Service Manual...

  • Page 58: Preamp Pcb Schematic With Apd

    Preamp PCB Schematic with APD Tone Control and IPod Input...
  • Page 59 651A Service Manual Headphone Driver and Pre Out Mute circuit...
  • Page 60 PIC, Logic and EMC points...

  • Page 61: Amp Pcb Schematic

    651A Service Manual AMP PCB – Schematic...
  • Page 62 Right Audio Channel...
  • Page 63 651A Service Manual Power Supply...
  • Page 64 VI Protection...
  • Page 65 651A Service Manual Wires...

  • Page 66: Switched Mode Power Supply Schematic

    Switched Mode Power supply Schematic...

  • Page 67: Auto Power Down Trigger Board Schematic

    651A Service Manual Auto Power Down Trigger board schematic...

  • Page 68: Auto Power Down(Trigger) Gerbers

    Auto Power Down(Trigger) Gerbers...
  • Page 69 651A Service Manual...

  • Page 70: Apd Trigger Cable

    APD Trigger Cable...

Table of Contents