Cambridge-Dacmagic2008-dac-sm维修电路原理图.pdf

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1、 Audio Partnership, Gallery Court, Hankey Place, London, SE1 4BB, UKTel: +44 (0)20 7940 2200 Fax: +44 0 20 7940 2233 DACMAGIC. Issue Date: November 2008 SERVICE MANUAL AP25144/1 Specifications: D/A converters Dual Wolfson WM8740 24bit DACs Digital filter Texas Instruments TMS 320VC5501 DSP upsamplin

2、g to 24bit 192kHz Frequency response 20Hz to 20kHz (0.1dB)* THD 1kHz 0dBFs 0.001% 24bit THD 1kHz -10dBFs 0.001% THD 20kHz 0dBFs 0.002% S/N ratio -112dBr Total correlated jitter 130pS Crosstalk 1kHz -100dB Crosstalk 20kHz -90dB Output impedance 50ohms Output level (unbalanced) 2.1V rms Output level (

3、balanced) 4.2V rms (2.1V per phase) Digital input word widths supported 16-24bit* Digital input sampling frequencies supported 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz Audio output upsampling Fixed 24bit 192kHz Dimensions (H x W x D) 52 x 215 x 191mm (2.0 x 8.6 x 7.6”) Weight 1.2kg/2.6lbs * Steep filte

4、r disabled *16bit for USB 1RadioFans.CN 收音机爱 好者资料库CAMBRIDGE AUDIO AZUR DACMAGIC SERVICE MANUAL TABLE OF CONTENTS Specifications 1 TableofContents 2 FrontPanelDetails 3RearPanelConnections 4SafetyInstructions 56ExplodedDiagram 7 BillofMaterials 810 MainPCBSPDIFI/O,ABUS,RS232 11MainPCBDSP,DIR,DIT12Mai

5、nPCBDAC13 MainPCBDAC(PowerSupply) 14FrontPanel(Control)LEDandMute15 2RadioFans.CN 收音机爱 好者资料库Rear panel connections 1. Unbalanced Audio Outputs Single-ended conventional stereo outputs for connection to the line-level phono/RCA inputs of an amplifier. 2. Balanced Audio Outputs The DacMagic also featu

6、res true balanced (XLR) outputs. This is a higher quality output that can reject noise and interference with equipment with balanced inputs. These balanced outputs are ideally suited for connection to the Cambridge Audio 840A or 840E amplifiers. XLR connectors should be wired as follows: Pin 1 Groun

7、d; Pin 2 Hot (in-phase); Pin 3 Cold (phase-inverted). 3. Digital Outputs The digital outputs allow a digital recording device to be connected. These outputs loop or pass-through unprocessed digital audio from the selected digital input. Two types are available (both the co-axial and the optical are

8、active concurrently and can be used to connect and run equipment at the same time): S/P DIF co-axial to obtain best results, use a high quality 75 ohm digital RCA interconnect cable (not one designed for normal audio use). TOSLINK optical use a high quality TOSLINK fibre-optic interconnect cable des

9、igned specifically for audio use. Note: These outputs are pass-through only; there is no upsampling or any other modification done to the LPCM input signal. 4. & 5. Digital Inputs 1 and 2 The DacMagic is fitted with two sets of digital inputs which enable the connection of source components. Each in

10、put has both S/P DIF and TOSLINK types fitted. Only one of the two types for each input should be connected at any one time. If both the optical and co-axial inputs have connections made to them (even if only one is attempting to function), neither will work. S/P DIF co-axial to obtain best results,

11、 use a high quality 75 ohm digital RCA interconnect cable (not one designed for normal audio use). TOSLINK optical use a high quality TOSLINK fibre-optic interconnect cable designed specifically for audio use. Note: This unit only accepts two-channel LPCM digital audio (e.g. Dolby Digital 2.0). You

12、cannot connect a Dolby Digital 5.1 or a DTS signal as they will not be recognised. If you wish to connect a DVD or similar device, please ensure that the sound output of your player is set to two-channel PCM. 6. USB In USB Type B input allowing direct connection to a PC via a Type B to Type A USB le

13、ad. The DacMagics operation is independent of your PC soundcard it will operate whether your PC has a soundcard or not. 7. AC 12V 1.5A Power Adaptor Socket Once you have completed all connections, plug the supplied power adaptor into the DacMagic. Important Note: Use the supplied power supply unit O

14、NLY. Rear Panel Connections3Front panel controls 1. Power On/Off Switches the unit between On and Off. 2. Source Press to select between USB playback or Digital Inputs 1 and 2. The corresponding LED will light up to show which source has been selected. 3. Filter/Phase Select Momentarily press to sel

15、ect between three different filter modes: linear phase, minimum phase or steep. The corresponding LED will light up to show which filter has been selected. 4. Phase Indicates the output phase selected. Press and hold the Filter/Phase select button for approximately two seconds to select normal or in

16、verted phase output. When the LED lights up, the phase is inverted by the DacMagic. If you suspect that your source material or amplifier, etc., is inverting the phase of the musical signal, you can use this function to re-invert the audio and regain absolute positive phase. 5. Incoming Sampling Rat

17、e In the presence of an incoming digital stream, the relevant LED will light up to indicate the incoming digital sampling frequency (between 32kHz and 96kHz LPCM). Front Panel Controls4SafetyInstructionsImportant safety instructions For your own safety please read the following important safety inst

18、ructions carefully before attempting to connect this unit to the mains power supply. They will also enable you to get the best performance from and prolong the life of the unit: ? 1. Read these instructions. ? 2. Keep these instructions. ? 3. Heed all warnings. ? 4. Follow all instructions. ? 5. Do

19、not use this apparatus near water. ? 6. Clean only with a dry cloth. ? 7. Do not block any ventilation openings. Install in accordance with the manufacturers instructions. ? 8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) t

20、hat produce heat. ? 9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the pro

21、vided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. 10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles and the point where they exit from the apparatus. 11. Only use attachments/accessories s

22、pecified by the manufacturer. 12. Use with only the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/ apparatus combination to avoid injury from tip-over. 13. Unplug this apparatus during lightning

23、 storms or when unused for long periods of time. 14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as the power-supply adaptor having been damaged, liquid has been spilled or objects have fallen into the apparatus, the

24、apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. WARNING To reduce the risk of fire or electric shock, do not expose this unit to rain or moisture. The unit must be installed in a manner that makes disconnection of the mains plug from the mains socket o

25、utlet (or appliance connector from the rear of the unit) possible. Where the mains plug is used as the disconnect device, the disconnect device shall remain readily operable. Only use the power supply adaptor supplied with this unit. Please ensure there is ample ventilation (at least 5cm clearance a

26、ll round). This unit must not be used near water or exposed to dripping or splashing water or other liquids. No objects filled with liquid, such as vases, shall be placed on the unit. WEEE symbol The crossed-out wheeled bin is the European Union symbol for indicating separate collection for electric

27、al and electronic equipment. This product contains electrical and electronic equipment which should be reused, recycled or recovered and should not be disposed of with unsorted regular waste. Please return the unit or contact the authorised dealer from whom you purchased this product for more inform

28、ation. CE mark This product complies with European Low Voltage (2006/95/EC) and Electromagnetic Compatibility (89/336/EEC) Directives when used and installed according to this instruction manual. For continued compliance only Cambridge Audio accessories should be used with this product and servicing

29、 must be referred to qualified service personnel. C-Tick mark This product meets the Australian Communications Authoritys Radio communications and EMC requirements. Ross Test Stamp This product meets Russian electronic safety approvals. 5SafetyInstructionsFCC regulations NOTE: THE MANUFACTURER IS NO

30、T RESPONSIBLE FOR ANY RADIO OR TV INTERFERENCE CAUSED BY UNAUTHORIZED MODIFICATIONS TO THIS EQUIPMENT. SUCH MODIFICATIONS COULD VOID THE USER AUTHORITY TO OPERATE THE EQUIPMENT. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of th

31、e FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference

32、 to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to co

33、rrect the interference by one or more of the following measures Re-orient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an e

34、xperienced radio/TV technician for help. Ventilation IMPORTANT The unit will become warm when in use. Do not stack multiple units on top of each other. Do not place in an enclosed area such as a bookcase or in a cabinet without sufficient ventilation. Positioning Choose the installation location car

35、efully. Avoid placing it in direct sunlight or close to a source of heat. No naked flame sources, such as lighted candles, should be placed on the unit. Also avoid locations subject to vibration and excessive dust, cold or moisture. The unit can be used in a moderate climate. This unit must be insta

36、lled on a sturdy, level surface. Do not place in a sealed area such as a bookcase or in a cabinet. Any space open at the back (such as a dedicated equipment rack) is fine, however. Do not place the unit on an unstable surface or shelf. The unit may fall, causing serious injury to a child or adult as

37、 well as serious damage to the product. Do not place other equipment on top of the unit. Due to stray magnetic fields, turntables or CRT TVs should not be located nearby due to possible interference. Electronic audio components have a running in period of around a week (if used several hours per day

38、). This will allow the new components to settle down and the sonic properties will improve over this time. Power sources The unit should be operated only from the type of power source indicated on the marking label. If you are not sure of the type of power-supply to your home, consult your product d

39、ealer or local power company. Overloading Do not overload wall outlets or extension cords as this can result in a risk of fire or electric shock. Overloaded AC outlets, extension cords, frayed power cords, damaged or cracked wire insulation and broken plugs are dangerous. They may result in a shock

40、or fire hazard. Be sure to insert each power cord securely. To prevent hum and noise, do not bundle the interconnect leads with the power cord or speaker leads. Cleaning To clean the unit, wipe its case with a dry, lint-free cloth. Do not use any cleaning fluids containing alcohol, ammonia or abrasi

41、ves. Do not spray an aerosol at or near the unit. Servicing These units are not user serviceable. Never attempt to repair, disassemble or reconstruct the unit if there seems to be a problem. A serious electric shock could result if this precautionary measure is ignored. In the event of a problem or

42、failure, please contact your dealer. 6Drawing RefDescriptionAP part number1Dacmagic Main PCB assemblyPY15122Dacmagic Control PCBPY15133Dacmagic SPS203 USB cablePY15144Dacmagic AC/AC adaptor UK 230VPY15154Dacmagic AC/AC adaptor CU 110VPY15164Dacmagic AC/AC adaptor EU 230VPY15194Dacmagic AC/AC adaptor

43、 AU 230VPY15255Dacmagic Rubber foot (set of 4)PY15176Dacmagic rubber standPZ154Cambridge Audio DacMagicDacMagic Exploded Diagram7AUDIO PARTNERSHIP PLCDACMAGIC BOM (AP22871/3)ValueDescription/TypeQtyComponent IdentManPNTolerancePackageInfoFactory P/NAP P/N10R0805 Thick Film3R8, R42, R1211%80520R1206

44、Thick Film2R62, R781%1206Rated current 2A3NO FIT1R674NO FIT2R105, R1065NO FIT4R113-R1166NO FIT1R12971R0805 Thick Film2R34, R351%80581R1206 Thick Film4R83-R85, R4031%120691R01206 Thick Film2R108, R1091%1206102R22W Carbon1R10710%20mm PitchStanding. Add Sleeving.1110R0805 Thick Film6R9, R14, R29, R30,

45、R117, R1181%8051210R1206 Thick Film1R591%12061322R0805 Thick Film2R3, R41%8051422R1206 Thick Film1R791%12061533RMNR145R2, R38, R39, R192, R19310%MNR141633R2W Carbon1R510%20mm PitchStanding. Add Sleeving.1733R0805 Thick Film4R44, R50-R521%8051847R0204 Melf6R10, R33, R36, R47, R104, R1721%2041947R0805

46、 Thick Film3R76, R77, R921%8052056R2W Carbon2R400, R40110%20mm PitchStanding. Add Sleeving.2175R0805 Thick Film2R18, R191%8052291R0805 Thick Film1R321%80523100RMNR141R110%MNR1424100R0805 Thick Film14R7, R11, R16, R17, R20, R22, R24, R25, R28, R56, R80-R82, R881%80525100R1206 Thick Film5R60, R61, R63

47、, R90, R911%120626100RMNR141R12410%MNR1427240R1206 Thick Film1R4021%120628430R0805 Thick Film1R311%80529750R0204 Melf8R93, R94, R184, R185, R200, R201, R208, R2091%204301K0805 Thick Film12R13, R65, R66, R70, R71, R75, R86, R89, R97-R99, R1431%805311K0204 Melf8R194-R197, R218-R2211%204321K20805 Thick

48、 Film1R1111%805331K50805 Thick Film1R61%805342K0805 Thick Film2R87, R1251%805352K0204 Melf8R180, R181, R188, R189, R204, R205, R212, R2130%204362K20805 Thick Film1R1451%805372K20204 Melf12R182, R183, R190, R191, R198, R199, R206, R207, R214, R215, R222, R2231%204383K30805 Thick Film2R21, R231%805393

49、K60805 Thick Film1R1101%805403K60204 Melf8R119, R120, R186, R187, R202, R203, R210, R2110%204418K20805 Thick Film1R1441%8054210K0805 Thick Film17R12, R26, R27, R41, R46, R49, R53-R55, R64, R68, R69, R95, R96, R122, R123, R1421%8054310KMNR143R43, R45, R7410%MNR144447K0805 Thick Film8R37, R40, R100-R1

50、03, R174, R1791%80545100K0805 Thick Film7R15, R48, R57, R58, R72, R73, R1121%80546NO FIT3C92, C108, C10947NO FIT4C117-C1204810pF 50V0805 NP0 Ceramic6C17, C18, C22, C105, C106, C2105%8054910pF 50V1206 NPO10C283, C290, C294-C296, C320, C324-C32710%12065022pF 50VNP0 08052C78, C7980551100pF 50V0805 NP0