Fairlight-UP4-pre-sm 电路图 维修手册.pdf

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1、 Fairlight UP-4 Mic Preamp Service Manual 23 October 2009 Issue 001 Rev A RadioFans.CN 收音机爱 好者资料库 Fairlight UP-4 Mic Preamp Page 2 2 Important Notice COPYRIGHT The material in this document is copyright to Fairlight.AU Pty Ltd, and may not be quoted or reproduced in any form without written permissi

2、on from the company. Fairlight is a trademark of FairlightAU Pty Ltd. All other trademarks are the property of their respective owners. LIMITED WARRANTY POLICY All the software and hardware provided with, or purchased especially for, Fairlight products has been tested for functionality. FairlightAU

3、Pty Ltd will make its best efforts to correct re- ported defects for future releases subject to technical practicalities. FairlightAU will also replace any defective media on which software has been delivered provided that the item to be replaced is returned to the dealer who supported the product w

4、ithin 90 days of purchase. FairlightAU Pty Ltd makes no warranty or representation either expressed or implied with re- spect to the systems performance or fitness for a particular purpose. In no event will FairlightAU Pty Ltd be liable for direct or indirect damages arising from any defect in the p

5、roduct or its documentation. Further, FairlightAU Pty Ltd will not accept any liability for any programs, sounds, audio recording or sequences stored in or used with Fair- light products, including the cost of recovery of such data. Product features and specifications are subject to change without n

6、otice. Fairlight.AU re- serves the right to change any part of this document without notice. The warranties, remedies and disclaimers above are exclusive and take precedence over all others, oral or written, express or implied, to the extent permitted by law in the geographical area of the products

7、use. No employee of Fairlight.AU, agent, distributor or employee of an agent or distributor is authorized to offer any variation from this policy. Copyright 2006 FairlightAU Pty Ltd, Unit 3, 15 Rodborough Rd, Frenchs Forest, NSW 2086, AUSTRALIA. Telephone +61 2 9975 1777 Fax +61 2 9975 1999 END USER

8、 LICENSE AGREEMENT You have acquired a device (“DEVICE”) which includes software licensed by FairlightAU from one or more software licensors (“FairlightAUs Software Suppliers”). Such software products, as well as associated media, printed materials, and “online” or electronic documentation (“SOFTWAR

9、E”) are protected by international intellectual property laws and treaties. The SOFTWARE is licensed, not sold. All rights reserved. IF YOU DO NOT AGREE TO THIS END USER LICENSE AGREEMENT (“EULA”), DO NOT USE THE DEVICE OR COPY THE SOFTWARE. INSTEAD, PROMPTLY CONTACT Fairlight.AU FOR INSTRUCTIONS ON

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11、 Fairlight UP-4 Mic Preamp Page 3 3 You may use the SOFTWARE only on the DEVICE. NOT FAULT TOLERANT. THE SOFTWARE IS NOT FAULT TOLERANT. Fairlight.AU HAS INDEPENDENTLY DETERMINED HOW TO USE THE SOFTWARE IN THE DEVICE, AND FairlightAUS SOFTWARE SUPPLIERS HAVE RELIED UPON FairlightAU TO CONDUCT SUFFIC

12、IENT TESTING TO DETERMINE THAT THE SOFTWARE IS SUITABLE FOR SUCH USE. NO WARRANTIES FOR THE SOFTWARE. THE SOFTWARE is provided “AS IS” and with all faults. THE ENTIRE RISK AS TO SATISFACTORY QUALITY, PERFORMANCE, ACCURACY, AND EFFORT (INCLUDING LACK OF NEGLIGENCE) IS WITH YOU. ALSO, THERE IS NO WARR

13、ANTY AGAINST INTERFERENCE WITH YOUR ENJOYMENT OF THE SOFTWARE OR AGAINST INFRINGEMENT. IF YOU HAVE RECEIVED ANY WARRANTIES REGARDING THE DEVICE OR THE SOFTWARE, THOSE WARRANTIES DO NOT ORIGINATE FROM, AND ARE NOT BINDING ON, Fairlight.AUS SOFTWARE SUPPLIERS. Note on Java Support. The SOFTWARE may co

14、ntain support for programs written in Java. Java technology is not fault tolerant and is not designed, manufactured, or intended for use or resale as online control equipment in hazardous environments requiring fail-safe performance, such as in the operation of nuclear facilities, aircraft navigatio

15、n or communication systems, air traffic control, direct life support machines, or weapons systems, in which the failure of Java technology could lead directly to death, personal injury, or severe physical or environmental damage. Sun Microsystems, Inc. has contractually obligated FairlightAUs Softwa

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17、LIMITATION SHALL APPLY EVEN IF ANY REMEDY FAILS OF ITS ESSENTIAL PURPOSE. IN NO EVENT SHALL FairlightAUs SOFTWARE SUPPLIERS BE LIABLE FOR ANY AMOUNT IN EXCESS OF U.S. TWO HUNDRED FIFTY DOLLARS (U.S.$250.00). Limitations on Reverse Engineering, Decompilation, and Disassembly. You may not reverse engi

18、neer, decompile, or disassemble the SOFTWARE, except and only to the extent that such activity is expressly permitted by applicable law notwithstanding this limitation. SOFTWARE TRANSFER ALLOWED BUT WITH RESTRICTIONS. You may permanently transfer rights under this EULA only as part of a permanent sa

19、le or transfer of the Device, and only if the recipient agrees to this EULA. If the SOFTWARE is an upgrade, any transfer must also include all prior versions of the SOFTWARE. EXPORT RESTRICTIONS. You acknowledge that SOFTWARE is of US-origin. You agree to comply with all applicable international and

20、 national laws that apply to the SOFTWARE, including the U.S. Export Administration Regulations, as well as end-user, end-use and country destination restrictions issued by U.S. and other governments. For additional information on exporting the SOFTWARE, see RadioFans.CN 收音机爱 好者资料库 Fairlight UP-4 Mi

21、c Preamp Page 4 4 Obtaining Technical Support Users requiring technical support should contact their local distributor. Information can also be found on the world wide web at: Manual Errors and Omission To help ensure that Fairlight provides the most accurate and comprehensive documentation, please

22、report any errors or omissions to: Service Manual UP4 MIC PREAMPLIFIER October 23, 2009 Fairlight UP-4 Mic Preamp Page 5 5 UP4 Mic Preamplifier The UP4 is a four channel, one rack unit remote controlled universal preamplifier designed by Smart Research. If used in conjunction with the DREAM family b

23、oth gain and phantom power functions are accessible directly from the surface controls or via the Softmix GUI. The remote connection to the DREAM family is accomplished via a simple Ethernet connection. The design whilst allowing for remote control maintains the best achievable performance for any f

24、orm of available audio circuitry. Input and output levels of up-to +28dBu are accepted and with an EIN figure of -133dBu the system defines the state of the art for a universal input stage. Providing the ability to locate the preamplifier at the nearest available point to the signal source, the UP4

25、can reduce many forms of signal degradation that may appear when driving cables direcly with un-buffered low level signals These may manifest themselves as, radiated noise pickup, microphone cable noise, capacitive ringing effects, slew rate degradation, loss of high frequencies and increased distor

26、tion. UP4 key Specifications EIN50Ohm source, +64dB gain, referenced to +4dBu133dBu Frequency Response - Between 10 and 100khz+/- 0.1dB THD100-20Khz, 1Khz/0dBu signal 12dB gain setting0.0003% THD100-20Khz, 1Khz/-64dBu signal 64dB gain setting0.02% CMRR At 0dB gain setting, 1kHz-70dBu CMRR At +64dB g

27、ain setting, 1kHz-80dBu Input Headroom All gain settings +28dBu Output Headroom All gain settings+28dBu Crosstalk Measured at +64 Gain, clip second channel-100dBu Input Impedance Optimised at low/high gains. Ohms. 6K8/1K6 Power consumption Selectable 100-230 volts40 Watts Remote Control: Two options

28、 have been provided. Ethernet allows for control from devices such as Fairlights Dream; or Apple and IBM computers (software is provided). Also, various PUP units can interface using an audio XLR data cable. This long range signal can be patched through normal audio tie lines, such as a multicore be

29、tween a stage and mixing position. Technical discussion PUP represents many years of development by Alan Smart. Noise, CMRR, Distortion, Headroom, Crosstalk, Dynamic Range are exemplary, and outperform all other tested units evaluated so far (Focusrite Blue, Massenburg); and also beating all publish

30、ed specs so far examined (Amek 9098, DACS, APHEX - though one DACS unit however has a better published CMRR spec at 1KHz). The circuit is a unique variant of instrumentation amplifier topology, starting with the good CMRR performance typical of this format. All internal audio circuitry is fully bala

31、nced, maintaining symmetry from input to output, which helps further reject noise, crosstalk, and distortion products. Service Manual UP4 MIC PREAMPLIFIER October 23, 2009 Fairlight UP-4 Mic Preamp Page 6 6 Gain adjustment is achieved with only 5 relays, while offsets are nulled to typically 25micro

32、volts by DC-servo circuits in all stages, resulting in the need for only one Polycarbonate capacitor in the audio path. No electrolytics are used. Headroom at all points of the circuit is maintained to the power rails, at +28dBu, and at all gain settings. Many other designs suffer from degraded inpu

33、t headroom as a result of using a long tailed pair configuration; while the output performance is variously compromised from op-amp-only; pseudo-balanced; or transformer circuits falling prey to real-world situations not fully defined or tested in the lab. For example the pseudo-balanced opamp circu

34、it favored by 80% of manufacturers induces around 9dB of noise as a result of the positive feedback employed. As this is a dynamic problem, it measures well without signal present, and only manifests when excited by low level signals, resulting in worse noise performance in use. Driving outputs from

35、 op-amps directly brings other drawbacks such as far higher distortion under load and long cables, instability, and degraded slew rate performance. Again, often problems that manifest in system use, and so slip through the design stage, and dont show up on a specification sheet. To optimize these ou

36、tput drive issues we have developed a discrete transistor output circuit, capable of driving into long cables and difficult loads, and switch-select between balanced or unbalanced configuration. (This circuit is also in use in the C2 and other products). Discrete FETs are used for break-before-make

37、switching of phase reverse and muting functions; and with balanced, proprietary drive circuitry, outperform the charge introduction, off isolation, and rdson performance of the commonly used SSM2402 family of i.c. switches. OP275 amplifiers are used for the audio signal path. These were chosen in li

38、stening tests for their sound and hybrid FET/Transistor inputs, together with their overall performance. Large-geometry transistors bypass the first stage input transistors to provide an EIN figure of 133dB (see specifications). NPN or PNP input transistors can be fitted, so that should any advantag

39、eous new devices become available we have the best chance for their inclusion. As a result of both remote control and the surface mounting of components, a compact physical layout has been possible. Cables to and from front panel controls become unnecessary, and pcb layout problems are reduced such

40、as crosstalk, noise pickup and stability. This was an advantage in producing the 01/7 SSL Channel card, reducing wiring and installation. UP4 INSTALLATION NOTES POWER SUPPLY The unit is rated at 50 watts, and can be set to work from 90-250v supplies, at 50 or 60Hz. Operation in USA or CANADA, 110-12

41、0v supply: A north American NEMA type 3-pin power cable is supplied; the external voltage selector switch will be set to 115v (see below); and a T500mA; 250volt rated 20mm long slow-blow fuse fitted. Operation in the UK, AUSTRALIA or EUROPE, 220-250v supply: A power cable with the proper attachment

42、plug for the country will be required; the external voltage selector switch will be set to 230v (see below); and a T250mA; 250volt rated 20mm long slow-blow fuse fitted. Service Manual UP4 MIC PREAMPLIFIER October 23, 2009 Fairlight UP-4 Mic Preamp Page 7 7 Operation in JAPAN, 95-105v supply: A 100v

43、 transformer is fitted, and a USA power cable is supplied. The external voltage selector switch will be set to 100v (see below); and a T500mA; 250volt rated 20mm long slow-blow fuse fitted. Checking or changing the supply voltage setting: Locate the power input connector on the left of the unit as y

44、ou face the rear panel. The bottom of this connector is a voltage selector switch and fuse drawer. The supply voltage setting is marked at the top of this drawer, nearest the connector pins. (115v is shown on the diagram below). To change the voltage setting, turn the power off and disconnect the po

45、wer cable from the compressor. Slide the fuse drawer out with a flat screwdriver, and rotate it through 180 degrees, so that the new voltage marking is upmost, and push it back in. Checking or changing the fuse: Turn the power off and disconnect the power cable. Slide the fuse drawer out with a flat

46、 screwdriver. The fuse fits nearest the inside, and there is space for a spare fuse nearest the outside. For115v or 100v operation use T500mA, and for 230v use T250mA. (T indicates a slow-blow type fuse, 20mm long, and all fuses should be 250v rated types). If the fuse fails in use, and fails when r

47、eplaced, there is a fault condition, and you must contact the factory to arrange servicing. Do not attempt repairs or change the fuse value. WARNING : for continued protection against fire you must ensure that the correct value of fuse is fitted. Voltage selector switch and fuse drawer AUDIO CONNECT

48、IONS All inputs and outputs are balanced. We have developed a custom output stage capable of high output currents. This is a non-floating circuit, that has a better noise performance than possible with the commonly used electronically floated circuit, and better square wave performance than using a

49、transformer. This means that you must set the outp ut switc hes located near the output connectors to match the equipment you are connecting to: pin 2 hot /unbalanced (right position); balanced (middle position), or pin 3 hot /unbalanced (le ft position). The input connectors can be wired as normal, and because the main signal path is fully symmetrical, you can chose to wire either as pin 2 or pin 3 hot with no difference.