Sphinx-Myth11-pwr-sm 维修电路原理图.pdf

1. SERVICE MANUALMYTH 11STEREOPOWER AMPLIFIERPOWERSTANDBYPROTECTRadioFans.CN 收音机爱 好者资料库SPHINX Myth 11 Service Manual 2 1. UNPACKING.32. CONTACTING THE MANUFACTURER.33. THE POWER AMP AT A GLANCE.4Front panel.4Rear panel .54. OPERATION .6Power on.6Power off.65. TECHNICAL SPECIFICATIONS.76. ADJUSTMENT PROCEDURES.8Bias.8Offset .87. PROBLEMS AND SOLUTIONS .98. DIAGRAMS AND PARTS LISTS.10Measurement Set-up .11General Overview Myth 11.12Power Supply.13Amplifier Left.14Amplifier Right.15Input / Output.16Control .17Parts List.18RadioFans.CN 收音机爱 好者资料库SPHINX Myth 11 Service Manual 3 The Sphinx Myth 11 designThis service manual will help you to optimallyservice and repair the Sphinx Myth 11 StereoPower Amplifier.This high quality high end stereo power amp is ofdiscrete design throughout (no ICs are used).The power amp uses specially selected PowerMOS-FETs with a power bandwidth of over 20 MHz,a very fast slew rate and an unsurpassed phaselinearity over the power bandwidth. Each channeluses four 120W/10 A FETs, operates as a purevoltage source with an extremely low impedanceand is thus very stable.The most unique feature is that it works in fullClass-A mode up to 10 W!Thanks to the generous energy reserve of 69,600F, unlimited power is available for the largestsignal peaks.To obtain the maximum quality from this power ampit is necessary to use it with top quality audiocomponents, preferably with other Sphinxcomponents.1. UNPACKINGBefore leaving the factory every Myth 11 issubjected to stringent and extensive technical andexterior quality inspection.This ensures you will enjoy many years of highquality audio from a perfect-looking product.Attention: The power amp weighs over 10 kg!Never lift it out of the box without someonehelping you.After unpacking your Myth 11 we thereforerecommend you carefully check it for any transportdamage.Even if the component is in perfect condition youshould still keep the packing materials. If you needto transport your Myth 11 at a later time it will bebest protected by the original packing materials.2. 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:Phone:(+31) 35 602 0302Fax:(+31) 35 602 2806E-mail:audionleuronet.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 theMyth 11 for information about functions notdescribed in this manual.It is important to familiarise yourself with thespecial functions, operation and possibilitiesof the Sphinx Myth 11.SPHINX Myth 11 Service Manual 4 3. THE POWER AMP AT A GLANCEFront panel1. STANDBY: To switch the component on and off.2. POWER LED: Indicates the selected function:stand-by offamp on red3. STANDBY LED: Indicates the selected function:stand-by redamp on off4. PROTECT LED: Normally off. When blinking redit indicates that the protection circuit is activePOWERSTANDBYPROTECT1234SPHINX Myth 11 Service Manual 5 Rear panel1. Warning label: This shows important safetywarnings.2. OUTPUT R: To connect the cable from the rightloudspeaker:red+black-3. CONTROL IN: To connect the optical cable fromanother Sphinx component like a pre-amp.4. INPUT: To connect the cinch cables from theoutput of the signal source.5. Manufacturers label: This shows importantdata for the component, such as serial numberand mains power voltage.6. OUTPUT L: To connect the cable from the leftloudspeaker:red+black-7. AC POWER: Connect the power amp to amains outlet (230 - 240 VAC) and the mainspower switch.The mains fuse is placed behind the cover.Warning!Do not open!High voltage inside!Do not expose this unitto rain or moisture.AC Voltage: 220V/60Hz.Max. Power:600 WMade in The NetherlandsManufactured by :Sphinx LaboratoriesFuse:3,15 ATINPUTCONTROLINOUTPUT ROUTPUT LLR1234567SPHINX Myth 11 Service Manual 6 4. OPERATIONOnce you have finished connecting all components,you can switch on the Myth 11.Connect the mains cable to a mains outlet.Power onSwitch the Myth 11 on with the O / I switch (7) on therear panel.The STANDBY LED (3) will blink for a while afterwhich it will light red. The Myth 11 is now in stand-bymode.From now on you should switch the power amp onand off with the STANDBY button (1) on the frontpanel or the STANDBY button of another Sphinxcomponent connected to the optical CONTROL INjack.This way all circuits will remain at workingtemperature and the audio quality will be 100 %within 15 minutes after activating. Additionally itconsiderably increases the life span of thecomponent.Switch the Myth 11 on with the STANDBY button:the LED (3) will extinguish and the POWER LED (2)will light.If you activate the power amp for the first time orafter a long period of non-use with the power off,the amp will be at maximum performance after onehour.From stand-by mode it takes only around 15minutes.Power offYou switch the Myth 11 off (stand-by) with theSTANDBY button (1).N.B.: If you need to switch the system on againimmediately, you should wait for at least 60 secthough.Because switching on the amp within 30 sec willactivate the protection circuits: the red PROTECTLED (4) will blink rapidly.Only if you will not be using the amp for a longperiod (e.g. during holidays) should you switch theamp off with the O / I switch (7).In stand-by mode the Myth 11s power consumptionis still around the 70 W mark.SPHINX Myth 11 Service Manual 7 5. TECHNICAL SPECIFICATIONSBandwidth0 - 300,000 Hz (+0/-0.25 dB)Phase response error2x 94.5 W into 8 ohm (19.8 dBW), THD 2x 157.5 W into 4 ohm (22.0 dBW), THD 2x 217.6 W into 2 ohm (23.4 dBW), THD 0.01%THD+N (IHF-A)0.06% / 0.006% (2nd harmonic, 10 - 20,000 Hz)IMD85 dB / 98 dBChannel separation90 dB (1 20,000 Hz)Slew rate100 V/sDamping factor500 (1 1,000 Hz)InputCinch: unbalanced level, nominal1.25V (1.9 dBV) Impedance20 kSupply capacitance26,000 F total per channelPower consumption550 W max. (70 W standby)Dimensions (h x w x d)73 x 434 x 350 mmWeight10 kgThis unit conforms to the EMC interference regulations issued by the EU and to the CE standards.This unit complies with safety regulation VDE 0860 and therefore with international safety regulation IEC 65.Technical specifications may be changed by SPHINX without prior notice if technical developments make thisnecessary.1999 Audioscript BVSPHINX Myth 11 Service Manual8 6. ADJUSTMENT PROCEDURESThe Myth 11 only has three parameters for eachchannel (so six in total) that might need adjustment:- 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 partsof the Myth 11 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!BiasWith this procedure you set the proper bias level forthe power FETs. This ensures their Class Aoperation at low power levels.Connect the amplifier according to the drawing“Measurement Set-up” (page 11).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 Set the millivolt-meter to the DC-range. Place the two measuring clips of the meteracross one of the source resistorsLeft: R30L, R31L, R39L, R40LRight:R30R, R31R, R39R, R40R The level for each should be 8 mV DC (2 mV).If not: adjust potmeter P2L (Left) or potmeterP2R (Right) until the level is 8 mV. Repeat this procedure after 20 minutes tofinalise the adjustment. Switch the oscillator on and set it to 1 kHz and alevel of 0 dBV (1 V). Check the distortion with a THD analyser: itshould be conform to the specified value(0.006% IHF-A 1 20 kHz 50 W into 8ohm).If this is correct the procedure is finished.You may now switch off the amplifier or continuewith another adjustment procedure.OffsetThe 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“Measurement Set-up” (page 11).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. Set the millivolt-meter to the DC-range. Place the measurement clips of the meter overthe output terminal. The level should not exceed +1 or -1 mV DC.If it does: adjust potmeter P1L (Left) or P1R(Right) until the level is within this range. Repeat this procedure after 20 minutes tofinalise the adjustment. Switch the oscillator on and set it to 1 kHz and alevel of 0 dBV (1 V). Check the distortion with a THD analyser: itshould be conform to the specified value(0.006% IHF-A 1 20 kHz 50 W into 8ohm).If this is correct the procedure is finished.You may now switch off the amplifier or continuewith another adjustment procedure.SPHINX Myth 11 Service Manual9 7. PROBLEMS AND SOLUTIONSAt the moment of writing the Myth 11 has oneknown specific problem.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 topageProtection activatesTemperature of amplifier is toohighRe-adjust bias14/15Hum at the output.Modified from November 1998.Cinch input connector notmodified.Separate the ground from L&Rcinch input and place a 10 Ohmresistor between.10SPHINX Myth 11 Service Manual10 8. DIAGRAMS AND PARTS LISTSThe next pages contain the front and rear panel lay-out and a complete set of schematic drawingsincluding the associated parts lists (if applicable).hier massa doorslijpenRIGHTLEFTTussen beide massas een weerstand van 1R solderenModificatie tegen brommen.Massas linker kanaal en rechter kanaal nu appart aansluitenCN1RIGHTCN2LEFTR1RRight GNDLeft GNDTO RIGHT AMPTO LEFT AMPSPHINX Myth 11 Service Manual11 Measurement Set-up+GND+GNDLeftRightMYTH 11out1out2inp2inp1gndTHDAmplitudeFrequencyOscillatorTHD out(+)(-)(+)(-)THD ANALYZERxyinp2time/divinp1gndSCOOPout1out2inp2inp1ScoopSWITCH-BOXmVmV8R8RGNDGNDGNDGNDSPHINX Myth 11 Service Manual12 General Overview Myth 11Myth 11 protectionM11-prot.schMyth 11 inputM11-inp.schMyth 11 rectifierM11-rect.schMyth 11 amplifier leftM11-ampl.schMyth 11 amplifier rightM11-ampr.schSPHINX Myth 11 Service Manual13 Power SupplyD1SB356D4SB356C2220n/250VC1220n/250VC3220n/250VC4220n/250VC6220n/250VC9220n/250VC8220n/250VC7220n/250V+C5220u/63VD31N4007D21N400721212121FASENUL21212121121221212121-OUT1+OUT1+50V1GND_BEVGNDOUT1AC1_SEC1AC1_SEC2AC2_SEC1AC2_SEC2AC3_SEC1AC3_SEC2AC4_SEC1AC4_SEC2NTC1NTC-3AC-PRIM1AC-PRIM2NC1NC2NC3NC4SPHINX Myth 11 Service Manual14 Amplifier LeftC21L10u/100VC1L120pC2L220pC3L1uC14L100nC9L100nC4L100nR1L475RR2L22kAGNDR9L22RR10L22RR11L1k00R12L475RR13L22kR3L475RR4L12kP3L200RQ1L2SK389Q4L2SC1775+C10L100u/16VD1LLEDAGNDAGND+C13L220u/63VAGNDQ2L2SC1775Q3L2SC1775R7L820RR8L820RR5L22kR6L120kQ5L2SA970Q6L2SA970R15L39RR17L39RR16L56RR14L15kC12L100n+C11L220u/63VAGNDAGNDR20L300RR21L300RQ8L2SC2240Q7L2SC2240R18L3k3R19L220RP4L500RQ9L2SC2240C6L100nR24L1kR23L2R2R22L2R2R25L22RR26L22RR27L56R/2WR28L100RR30L0R22/5WR37L100RR39L0R22/5WR29L68RR31L0R22/5WR38L68RR32L47R/2WR40L0R22/5WQ10L2SC2705C5L10pQ11L2SA1145Q15L2SJ200Q18L2SJ200Q14L2SK1529Q17L2SK1529Q12L2SC4382Q13L2SA1668D6L1N4007D7L1N4007C7L47nAGNDSGNAUDIOGNDAUDIOC26L470pC28L100n+C32L2200u/63V+C34L2200u/63V+C36L2200u/63V+C38L2200u/63V+C40L2200u/63V+C42L2200u/63V+C44L2200u/63V+C45L2200u/63VC27L470pC29L100n+C33L2200u/63V+C35L2200u/63V+C37L2200u/63V+C39L2200u/63V+C41L2200u/63V+C43L2200u/63V+C46L2200u/63V+C47L2200u/63V+50VNUL-50VAGNDAGNDREL1LSCHRA_4WR44L22KL1LEE-K-021R33L10R/5WR34L10R/5WC8L220nC24L10nC23L1n/400VAGNDFRAMEOUTPUT-OUTPUT+R35L220RR36L100RC19L1nQ16L2SC1775D2L1N4148ABBAC4LC6LC2LOPTO1LCNY17DGNDC3LOPTO+OPTO-PTCL1PTCL2C5LC8LC10LC9LC7LNCC1LSPHINX Myth 11 Service Manual15 Amplifier RightC21R10u/100VC1R120pC2R220pC3R1uC14R100nC9R100nC4R100nR1R475RR2R22kAGNDR9R22RR10R22RR11R1k00R12R475RR13R22kR3R475RR4R12kP3R200RQ1R2SK389Q4R2SC1775+C10R100u/16VD1RLEDAGNDAGND+C13R220u/63VAGNDQ2R2SC1775Q3R2SC1775R7R820RR8R820RR5R22kR6R120kQ5R2SA970Q6R2SA970R15R39RR17R39RR16R56RR14R15kC12R100n+C11R220u/63VAGNDAGNDR20R300RR21R300RQ8R2SC2240Q7R2SC2240R18R3k3R19R220RP4R500RQ9R2SC2240C6R100nR24R1kR23R2R2R22R2R2R25R22RR26R22RR27R56R/2WR28R100RR30R0R22/5WR37R100RR39R0R22/5WR29R68RR31R0R22/5WR38R68RR32R47R/2WR40R0R22/5WQ10R2SC2705C5R10pQ11R2SA1145Q15R2SJ200Q18R2SJ200Q14R2SK1529Q17R2SK1529Q12R2SC4382Q13R2SA1668D6R1N4007D7R1N4007C7R47nAGNDSGNAUDIOGNDAUDIOC26R470pC28R100n+C32R2200u/63V+C34R2200u/63V+C36R2200u/63V+C38R2200u/63V+C40R2200u/63V+C42R2200u/63V+C44R2200u/63V+C45R2200u/63VC27R470pC29R100n+C33R2200u/63V+C35R2200u/63V+C37R2200u/63V+C39R2200u/63V+C41R2200u/63V+C43R2200u/63V+C46R2200u/63V+C47R2200u/63V+50VNUL-50VAGNDAGNDREL1RSCHRA_4WR44R22KL1REE-K-021R33R10R/5WR34R10R/5WC8R220nC24R10nC23R1n/400VAGNDFRAMEOUTPUT-OUTPUT+R35R220RR36R100RC19R1nQ16R2SC1775D2R1N4148ABBAC4RC6RC10ROPTO1RCNY17DGNDC7RC8RPTCR1PTCR2C2RC5RC1RC3RNCNCC9RSPHINX Myth 11 Service Manual16 Input / OutputINPUTOPTOAMP_PHTRANRSIGLSIGRGNDLGNDOPTO+OPTO-SPHINX Myth 11 Service Manual17 ControlR22470R/2WR23470R/2WR6A560RD65V1D6A5V1+C610u/16V+50V+5VDGNDR14k7R44k7R34k7R24k7C2100n+5V+5VC1100nDGNDDGNDR910kR747kR84k7C5100n+50VDGNDC191nR194k7R21100kR242k2C3100n+C41u/16VDGNDDGND+5V+5VC9100nS2S1DGNDR52k2C12100nDGNDR14390RC7100nD1LEDDGNDR15390RC8100nD2LEDDGNDR18390RC11100nD3LEDDGNDC10100nC13100nR10560RR13560RDGNDDGNDDGNDDGNDDGNDR122k2R112k2C14100nQ1BD879D4BYD77led protectled stand_bypower ledLOW BIASLOW BIASDGND+50VD7BYD17D5BYD17C17100nC18100nC16100nR264k7R2010kR1710kR274k7R1610kQ4BC817Q5BC817Q6BC807+C15330u/6V3DGND+5VC211nC201nDGNDRA21RA32RA43/MCRL4GND5RB06RB17RB28RB39RB410RB511RB612RB713VCC14X215X116RA017RA118U1PIC16C71+50VGNDCR1CR3CL1CR9CR10CL2KAST1KAST2CL10CL8CL7CL9CR6CR4CL6CL4CL3CR8RELAYS RIGHTRELAYS LEFTOVERCURRENTOVERVOLTAGEOPTO INPUTOVER VOLT.PTC2PTC1CR7CR5CR2CL5SPHINX Myth 11 Service Manual18 Parts ListDesignatorPart TypeDescriptionC1100nMKT capacitorC1220n/250VMKT capacitorC10100nMKT capacitorC10L100u/16VElectrolytic capacitorC10L1PINConnectorC10R100u/16VElectrolytic capacitorC11100nMKT capacitorC11L220u/63VElectrolytic capacitorC11R220u/63VElectrolytic capacitorC12100nMKT capacitorC12L100nMKT c