Sphinx-Project10-int-sm 维修电路原理图.pdf

1. SERVICE MANUALPROJECT TENINTEGRATEDSTEREO AMPLIFIERRadioFans.CN 收音机爱 好者资料库SPHINX Project Ten Service Manual 2 1. UNPACKING.32. SPHINX WARRANTY CARD.33. CONTACTING THE MANUFACTURER.34. THE AMP AT A GLANCE.4Front panel.4Rear panel .55. SPHINX REMOTE CONTROL.6Buttons and LED indication.6Operation.7Selecting without switching.7Batteries.7Encountering problems.76. TECHNICAL SPECIFICATIONS.87. GENERAL CHECKLIST .9Protection modes.9Short Circuit.9Standby mode.9Necessary Equipment.98. ADJUSTMENT PROCEDURES.10Bias.10Offset .119. PROBLEMS AND SOLUTIONS .1210. DIAGRAMS AND PARTS LISTS.13Connection diagram bias adjustment.14Connection diagram offset adjustment.15Connections main board and display board of Project 10.16General overview Project 10.17Project 10 power supply and input selection.18Project 10 volume board.19Project 10 amplifier left .20Project 10 amplifier right .21Project 10 control.22PCB drawings of Project 10.23Parts list.24RadioFans.CN 收音机爱 好者资料库SPHINX Project Ten Service Manual 3 The Sphinx Project Ten designThe Sphinx Project Ten was designed for the ever-increasing group of quality-conscious audiophiles.We are very proud of the tradition connected withthe SPHINX name, especially concerning audioquality perfection.This service manual will help you to optimallyservice and repair the Sphinx Project TenIntegrated Stereo AmplifierThis integrated high-end stereo amplifier is ofexceptional quality. With exception of the balancedinput section, it is of discrete design throughout (noICs are used). The pre-amp section is built aroundDual FETs and the amplifier is DC-coupled frominput to output.The two mono power amps (each channel is totallyindependent) use special power transistors with apower bandwidth of over 20 MHz, a very fast slewrate and an unsurpassed phase linearity over thepower bandwidth. The amplifiers are therefore verystable and can effortlessly drive every type andformat of loudspeaker (even the most complex onessuch as electrostatic and magnetostatic.) atmaximum quality.All internal audio cabling is Siltech pure silver andthe amp outputs are sent to the loudspeakerconnectors via heavy duty, completely sealed gold-plated relays.To obtain the maximum quality from this integratedamp it is necessary for it to be properly aligned andto be used with top quality audio components,preferably other Sphinx components.1. UNPACKINGBefore leaving the factory every Project Ten issubjected to stringent and extensive technical andexterior quality inspection. This ensures the usermany years of high quality audio from a perfect-looking product.We recommend owners to ship the Project Ten inits original carton.After unpacking the Project Ten we thereforerecommend you carefully check it for any transportdamage.If you find any damage and the product has notbeen shipped in the original carton the ensuringrepair costs will not be covered by the warranty.2. SPHINX WARRANTY CARDTo be entitled to any warranty repairs the ownermust have send the filled out warranty card toSphinx or a distributor where it has been registered.Other regulations may apply in your specificcountry: when in doubt, please consult the properauthorities.3. CONTACTING THE MANUFACTURERIn case of any problem not covered in this manualor if you have other questions you may contact theSphinx International Service Department in TheNetherlands (local time: GMT +1h) during officehours at the following numbers:Telephone(+31) 35 602 0302Fax(+31) 35 602 2806E-mailaudionleuronet.nlIt is always very helpful and efficient if you have allrelevant information about the specific product andthe problem ready.Please also refer to the User Manual of theProject Ten for information about functionsnot described in this manual.It is important to familiarise yourself with thespecial functions, operation and possibilitiesof the Sphinx Project Ten.SPHINX Project Ten Service Manual 4 4. THE AMP AT A GLANCEFront panel1. VOLUME: With this motor-controlled knob youmay adjust the volume of the loudspeakers.The volume can be controlled manually or via theoptional Remote Control.2. STANDBY: To switch the component on and off.When the component is off (standby) this isindicated by the red LED.When the component is active the LED will begreen.3. MUTE: Press this button to temporarily mute thesound. The red LED will light.4. CD: To select the CD input.5. TUNER: To select the TUNER input.6. LINE 1: To select the LINE 1 input.7. LINE 2: To select the LINE 2 input (cinch orbalanced).8. TAPE MON: To select the TAPE IN input.As soon as you have pressed one of the buttons5. to 9. the corresponding red LED next to it willlight.9. PHONES: To connect dynamic stereoheadphones.123456978SPHINX Project Ten Service Manual 5 Rear panel11. ON/OFF: This is the mains power switch.12. Fuse holder: Contains a fuse (3.15 A slow).13. AC Power: Connect the mains cable to a mainspower outlet (230 - 240 VAC).14. CONTROL OUT: To connect the optical cablegoing to another Sphinx component.15. RIGHT OUTPUT: To connect the cable from theright loudspeaker:red+white-16. LEFT OUTPUT: To connect the cable from theleft loudspeaker:red+white-17. Manufacturers label: This shows importantdata for the component, such as serial numberand mains power voltage.18. BALANCED LINE 2 RIGHT: To connect theXLR signal cable (balanced cable) from the rightoutput of the signal source for Input 2.19. BALANCED LINE 2 LEFT: To connect the XLRsignal cable (balanced cable) from the leftoutput of the signal source for Input 2.20. CINCH/BALANCED: This switch is to select theinput connector for LINE 2:outLINE 2 (cinch)inBALANCED LINE 221. LINE 2: To connect the cinch signal cable fromthe signal source for LINE 2.22. LINE 1: To connect the cinch signal cable fromthe signal source for LINE 1.23. TUNER: To connect the cinch signal cable fromthe tuner.24. CD: To connect the cinch signal cable from theCD player.25. TAPE IN: Connect this input to the output of therecorder.26. TAPE OUT: Connect this output to the Input ofthe recorder.11121314151617181920212223 2425 26SPHINX Project Ten Service Manual 6 5. SPHINX REMOTE CONTROLThis single Sphinx Remote Control lets you controlall functions: not only of the Project Ten, but of allother Sphinx equipment.Only the following buttons and indications on theRemote apply to the Project Ten (the others will notfunction):Buttons and LED indication1. PRE-AMP: To select the amp. All buttonspressed hereafter will only control the ampfunctions.The buttons TUNER and CD will have no effecton the amp.2. STANDBY: Use this red button to switch theProject Ten to stand-by.3. : Pressing this green button mutes theoutputs (temporarily) and you will not hear anysound. The red LED will be illuminated. Anotherpress on this button un-mutes the outputs4. TAPE/MONITOR: Use this button to select theTape IN input. Pressing this button has thesame effect as pressing the TAPE button on thefront panel.Note: The LED of the selected input (see 5.) willremain illuminated.5. 1 - 4: To select inputs CD to Line 2 .1CD2Tuner3Line14Line 26. ? button: Pressing this button has the sameeffect as clockwise rotating the VOLUME controlon the front panel. You will increase the volume.7. ? button: Pressing this button has the sameeffect as anti-clockwise rotating the VOLUMEcontrol on the front panel. You will decrease thevolume.SPHINX Project Ten Service Manual7OperationThe Sphinx Remote is used for several differentmodels and can therefore transmit different controlcodes, depending on which model has beenselected with the select buttons (1.).Important: Always press the PRE-AMP buttonbefore you send a command (even if you only haveone Sphinx component).If not it is possible that although the Remote willsend a signal (LED blinks) nothing happensbecause the transmitted signal is not recognised bythe component.Indoors the Remote may be used up to a distanceof 7 meter, provided there is no strong sunlight inthe room and if you aim the Remote at thecomponent.Always aim the Remote straight at the front panel ofthe component, the maximum offset angle is 30.Selecting without switchingSuppose for instance that you would like to selectthe Tuner to Radio 4 without interrupting the CDplayback.In that case you momentarily depress (not longerthan 0.5 sec) the TUNER button and the 4 button.The same procedure is used for the other systemcomponentsHow to operate the Remote Control with thedifferent Sphinx components will be explained in thecorresponding User Manual of each component.BatteriesThe four batteries have a life span of approx. oneyear during normal use, but shorter when usedmore intensely.Replacement batteries: 1.5 V, model penlight orAAA . You may also use rechargeable 1.5 Vbatteries.Note: Position the new batteries exactly as shown inthe illustration at the bottom of the batterycompartment, otherwise the Remote will notfunction!Encountering problems.Remote Control does not workWrong component selectedSelect the correct oneDistance to component exceeds 7mUse remote at closerrangeAngle between Remote andcomponent exceeds 30Decrease angleSensor window on front dirtyClean windowBatteries empty or incorrectlyplacedUse new batteries orreplace the old onescorrectlyStrong (sun)light in roomShade offComponent is not switched on (!)Switch it onComponent reacts differently than expected ornot at allWrong component selectedSelect the correct oneComponent or remote does notfunctionCheck componentwith its originalremoteBatteries of remote emptyUse new batteriesSPHINX Project Ten Service Manual86. TECHNICAL SPECIFICATIONSBandwidth0 - 60,000 Hz (+0/-3 dB with RF input filter)Phase response error2x 80 W into 8 (19.0 dBW), THD 2x 120 W into 4 (20.8 dBW), THD 2x 160 W into 2 (22.0 dBW), THD 0.02%Output voltage / current, max.34 V / 20 ATHD+N (IHF-A)0.01% (80 W into 8 )IMD106 dBChannel separation80 dB (1 - 20,000 Hz)Slew rate25 V/sDamping factor200 (1 - 20,000 Hz)Inputs XLR, balanced cinch, unbalanced1x Line 21x Line 2, 1x Line 1, 1x CD, 1x Tuner, 1x Tape level, nominal0.15 V (-16.5 dBV) for 60 W into 8 impedance20 k (3 k balanced)Outputs cinch1x Tape level10 V max. (20 dBV) (1 - 20,000 Hz, THD 1 M)? 2x non-inductive load resistor 8 / 100 Watt? 1x harmonic distortion analyser(internal distortion 60 MHz)? 1x connection unit / switch box(to connect scope, resistors and amp outputs todistortion analyser)? 2x shorting connector(for balanced pre-amp inputs)? 2x balanced cable set(to connect distortion analyser to Project Ten)SPHINX Project Ten Service Manual108. ADJUSTMENT PROCEDURESThe Project Ten is an integrated amplifier, meaningthe pre-amp and power amp sections are combinedinto one cabinet.The Project Ten only has two parameters for eachchannel (so four in total) that might needadjustment:- Bias: to set the bias current and bias voltage ofthe amplifier for normal use.- Offset: to set the DC-offset voltage of theoutput.These adjustments might be necessary when theamplifier has been used for a period of time (andsettings have changed due to ageing) or when apart of the Project Ten have been replaced.Attention:When re-adjusting any setting please ensure thatthere is no loudspeaker connected to the output!Otherwise the loudspeaker may be seriouslydamaged.Attention:The amplifier is able to generate high outputvoltages of over + or -40 V.Please be very careful during the adjustments!The Project Ten is a two channel amplifier.After removing the top cover plate you will see theLeft and Right Channels clearly marked.The power transistors are mounted underneath theheatsinks.BiasWith this procedure you set the proper bias level forthe power transistors. This ensures their Class Aoperation at low power levels.Connect the amplifier according to the drawing“Connection Diagram Bias Adjustment” (page 14).The input of the amplifier must be shorted (by wayof the MUTE function of the oscillator). Switch the amplifier ON and wait until it hasreached the proper working temperature (thistakes an hour). Set the millivolt-meter to the DC-range. Place the two measuring clips of the meteracross one of the emitter resistorsLeft: R267, R271, R273, R277Right:R467, R471, R473, R477(refer to schematic in Pj10main.PDF).These resistors are positioned to the left of thepower supply condensers. The level for each should be 40 mV DC(2 mV).If not: adjust potmeter P202 (Left) or potmeterP402 (Right) until the level is 40 mV. Switch the oscillator on and set it to 1 kHz and alevel of 0 dBu. Check the distortion with a THD analyser: itshould be conform the specified values (0.01%IHF-A 1 20 kHz 80 W into 8 ohm). If this is correct the procedure is finished. You may now switch off the amplifier or continuewith another adjustment procedure.SPHINX Project Ten Service Manual11OffsetThe Offset adjustment procedure minimises the DCoffset value of the amplifier output. This DC offset isimportant when capacitive loads are used, such aselectrostatic loudspeakers. These loudspeakersoften use a very low-impedance step-uptransformer. The amplifier sees this load as ashort for the DC voltage.Connect the amplifier according to the drawing“Connection Diagram Offset Adjustment” (page 15).The input of the amplifier must be shorted (by wayof the MUTE function of the oscillator). Switch the amplifier ON and wait until it hasreached the proper working temperature (thistakes an hour). Set the millivolt-meter to the DC-range. Place the measurement clips of the meter overthe output terminal. The level should not exceed +5 or -5 mV DC.If not: adjust potmeter P201 (Left) or P401(Right) until the level is within this range. Switch the oscillator on and set it to 1 kHz and alevel of 0 dBu. Check the distortion with a THD analyser: itshould be conform the specified values (0.01%IHF-A 1 - 20 kHz). If this is correct the procedure is finished. You may now switch off the amplifier or continuewith another adjustment procedure.Attention:Do not connect speakers on the Project 10 whenadjusting the offset.Please be careful during the adjustments!SPHINX Project Ten Service Manual129. PROBLEMS AND SOLUTIONSAt the moment of writing the Project Ten has noknown specific problems.If in the future you encounter any problem(s) youmay enter the info in this table. This table can thenbe used for future reference.Please also send (by fax or e-mail) the specificinformation to the Sphinx International ServiceDepartment (see page 3): this info can then beadded to the general database to aid others.ProblemCauseSolutionRefer topageAmplifier doesnt workFuses are blowed (short circuitoutput)Replace fuses type 3.15A SBPage 18SPHINX Project Ten Service Manual1310. DIAGRAMS AND PARTS LISTSThe next pages contain the front and rear panel lay-out and a complete set of schematic drawings including theassociated parts lists (if applicable).Connection diagram bias adjustment .14Connection diagram offset adjustment.15Connections main board and display board of Project 10 .16General overview Project 10 .17Project 10 power supply and input selection .18Project 10 volume board.19Pro