Sphinx-Myth1-pre-sm 维修电路原理图.pdf

1. SERVICE MANUALMYTH 1PREAMPLIFIERLINE 3LINE 1CDPHONESVIDEOMUTELINE 4LINE 2TUNERTAPE / MONSTANDBYRadioFans.CN 收音机爱 好者资料库SPHINX Myth 1 Service Manual 2 1. UNPACKING.32. CONTACTING THE MANUFACTURER.33. THE PRE-AMP AT A GLANCE .4Front panel.4Rear panel .54. OPERATION .6Power on.6Selecting an input .6Adjusting the volume level .6Temporarily set volume to zero.6Power off.65. SPHINX REMOTE CONTROL.7Buttons.7Operation.8Selecting without switching.8Batteries.8Encountering problems.86. TECHNICAL SPECIFICATIONS.97. ADJUSTMENT PROCEDURES.10Offset .108. PROBLEMS AND SOLUTIONS .119. DIAGRAMS AND PARTS LISTS.12General Overview Myth 1.13Power Supply.14Input / Output.15Amplifier Left.16Amplifier Right.17Controller .18Keyboard.19Parts list.20RadioFans.CN 收音机爱 好者资料库SPHINX Myth 1 Service Manual 3 The Sphinx Myth 1 designThis service manual will help you to optimallyservice and repair the Sphinx Myth 1 Preamplifier.This pre-amp uses the newest technologies andrefined designs and is extremely simple to operate.Designs that successfully have been used in theaward winning Project Eight.Such as the ultra-linear extremely low-noiseClass-A audio circuits, built from the finest hand-selected parts.The signal path is completely balanced from input tooutput, and left and right are totally separated.The power supply is of a unique design (fully Class-A!) and consists of three completely separate andindependent sections: one for the digital control,plus one each for the left and right channel.Input selection is done by means of precisionrelays. The ALPS volume control is motor-driven.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 1 is subjectedto stringent and extensive technical and exteriorquality inspection.This ensures you will enjoy many years of highquality audio from a perfect-looking product.After unpacking your Myth 1, we thereforerecommend you carefully check it for any transportdamage.In case of damage: please contact your Sphinxdealer immediately and retain all packing materialsfor possible proof of damage and possible claims.Even if the component is in perfect condition youshould still keep the packing materials. If you needto transport your Myth 1 at a later time it will be bestprotected 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 1 for information about functions notdescribed in this manual.It is important to familiarise yourself with thespecial functions, operation and possibilitiesof the Sphinx Myth 1.SPHINX Myth 1 Service Manual 4 3. THE PRE-AMP AT A GLANCEFront panel11. CD: To select the CD input. The red LED willlight.2. LINE 1: To select the Line 1 input. The red LEDwill light.3. LINE 3: To select the Line 3 input. The red LEDwill light.4. VIDEO: To select the Video line input. The redLED will light.5. MUTE: Press this button to temporarily mute thesound. The red LED will light.6. PHONES: To connect dynamic stereoheadphones.7. TUNER: To select the Tuner input. The red LEDwill light.8. LINE 2: To select the Line 2 input. The red LEDwill light.9. LINE 4: To select the Line 4 input. The red LEDwill light.10. TAPE / MON: To select the TAPE IN input. Thered LED will light.11. STANDBY: To switch the component on and off:onLED is offoffLED is red12. Receptor window for the IR signals from theRemote Control.13. VOLUME: This rotary knob adjusts the volumelevel.LINE 3LINE 1CDPHONESVIDEOMUTELINE 4LINE 2TUNERTAPE / MONSTANDBY12345678910111213SPHINX Myth 1 Service Manual 5 Rear panel1. TUNER: To connect the signal cable from thetuner.2. CD: To connect the signal cable from the CDplayer.3. TAPE OUT: Connect this output to the input ofthe recorder.4. TAPE IN: Connect this input to the output of therecorder.5. LINE 4: To connect the signal cable from thesignal source for LINE 4.6. LINE 3: To connect the signal cable from thesignal source for LINE 3.7. LINE 2: To connect the signal cable from thesignal source for LINE 2.8. LINE 1: To connect the signal cable from thesignal source for LINE 1.9. VIDEO: To connect the signal cable from theaudio output of the video source.10. Control Out: To connect the optical cable(s) toother Sphinx component(s).11. OUT 1 /2 L+R: Connect this output with a signalcable to the input of your power amp.12. Manufacturers label: This shows importantdata for the component, such as serial numberand mains power voltage.13. Warning!: This shows important informationabout the safety regulations for the Myth 1.14. AC Power: Connect the mains cable to a mainspower outlet (100 - 240 VAC).The mains fuse is placed behind the cover.Here you also find the mains power switch O / I.1234567891011121314SPHINX Myth 1 Service Manual 6 4. OPERATIONConnect the mains cable to a mains outlet.Once you have finished connecting all components,you can power on the Myth 1 with the mains switchO / I (14) .The volume control will then automatically turncounter-clockwise and for a while the STANDBYLED will blink red, after which it will remain red. Thepre-amp is now in standby mode.From now on you should switch the amp on or offwith the STANDBY button (11).That way, all circuits will remain at optimumoperating temperatures and the audio quality will be100% immediately after switching on. Additionally itsignificantly increases the life span of thecomponent.The Myth 1 is now in stand-by mode.Power onSwitch the Myth 1 on with the STANDBY button.The pre-amp will select the CD input after which itun-mutes the output.Selecting an inputYou may select an input with one of the buttons 1. to9.: the LED will illuminate.The new input becomes active after you haveselected it. You will hear a click. This is caused bythe precision relays for the inputs: the old one isreleased while the new one is energised.Adjusting the volume levelThe large VOLUME control to the right adjusts thevolume level from OFF to maximum (fully clockwise).The level change is immediate.Temporarily set volume to zeroPress the MUTE button (5) temporarily mutes thesound. The red LED will light. Another press on thisbutton un-mutes the output.Power offYou switch the Myth 1 off (to stand-by) with theSTANDBY button (11).SPHINX Myth 1 Service Manual 7 5. SPHINX REMOTE CONTROLThis single Sphinx Remote Control lets you controlall functions: not only of the Myth 1, but of all otherSphinx equipment.Only the following buttons and indications on theRemote apply to the Myth 1 (the others will notfunction):Buttons1. PRE-AMP: To select the amp. All buttonspressed hereafter will control only the pre-ampfunctions.The buttons TUNER and CD will have no effect.2. STANDBY: Use this red button to switch theMyth 1 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/MON button(9) on the front panel.Note: The LED of the selected input (see 5.) willremain illuminated.5. 1 - 7: To select inputs CD to VIDEO (Note: 8 to0 do not function):1CDCD input2TUNERTuner3LINE 1Line input 14LINE 2Line input 25LINE 3Line input 36LINE 4Line input 37VideoAudio from video source6. ? button: Pressing this button has the sameeffect as rotating the VOLUME control on thefront panel clockwise. You increase the volume.7. ? button: Pressing this button has the sameeffect as rotating the VOLUME control on thefront panel anti-clockwise. You decrease thevolume.SPHINX Myth 1 Service Manual 8 OperationThe Sphinx Remote is used with 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).Otherwise it is possible that, although the Remotesends a signal, nothing happens because thetransmitted signal is not recognised by thecomponent.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 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 systemcomponents.How 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 approximatelyone year during normal use, but shorter when usedmore intensely.Replacement batteries: 1.5 V, model micro orpenlite or LR03 or AAA or AM4 (one of these codesis indicated on the packaging and the batteries).You may also use rechargeable 1.5 V batteries.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 componentexceeds 7 mUse 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 off light sourceComponent is not switched on(!)Switch it onComponent reacts differently than expected ornot at allWrong component selectedSelect the correct oneComponent or Remote doesnot functionCheck component withits original remoteBatteries in Remote emptyUse new batteriesSPHINX Myth 1 Service Manual 9 6. TECHNICAL SPECIFICATIONSBandwidth0 111,000 Hz (+0/-3 dB)Phase response error0.5Gain9.5 dB max.THD+N (IHF-A)0.020 / 0.002% (2nd harm., 10 - 20,000 Hz)IMD84 / 100dBChannel separation98 dBSlew Rate 24 V/sInputs8x cinch (gold-plated) Level, nominal (for 1 V output)0.13 V (-18 dBV) impedance47 kohmOutputs2x cinch Out 1, Out 2 (gold-plated)1x cinch Tape (gold-plated) level10.5 V max. (20.42 dBV) (1 - 100,000 Hz, THD 0.002%) impedance10 ohmVolume controlALPS motorised channel imbalanceless than 2 dBSphinx Control2x opticalRemote controlFull functionPower supplyInternal, completely stabilisedSupply capacitance16,280 F totalPower consumption11 W (9 W stand-by)Dimensions (h x w x d)75 x 434 x 350 mmWeight7 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 1 Service Manual10 7. ADJUSTMENT PROCEDURESThe Myth 1 only has one parameters for eachchannel (so two in total) that might needadjustment:- 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 1 have been replaced.OffsetThe Offset adjustment procedure minimises the DCoffset value of the amplifier output. 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. The level should not exceed +1 or -1 mV DC.If it does: adjust potmeter P2L (Left) or P2R(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(0.002% IHF-A 1 20 kHz).If this is correct the procedure is finished. You may now switch off the amplifierSPHINX Myth 1 Service Manual11 8. PROBLEMS AND SOLUTIONSAt the moment of writing the Myth 3 has no knownspecific 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 topageBandwidth 100 kHzValue of C2L, C2R too large(220 pF)Change C2L, C2R value to 47pF16/17SPHINX Myth 1 Service Manual12 9. 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).SPHINX Myth 1 Service Manual13 General Overview Myth 1LINE-ORLINE-OLMOTOR1MOTOR2TO-AMPLTO-AMPRMyth 1 input / outputm1-io.schLINE-ORLINE-OLMOTOR1MOTOR2TO-AMPLTO-AMPRTO-AMPLLINE-OL-26V+26VMyth 1 left channelm1-ampl.schTO-AMPLLINE-OL-26V+26V-26V+26VMyth 1 power supplym1-ps.sch-26V+26VANA1ANA2LEDSOUTPMyth 1 controlm1-ctrl.schANA1ANA2LEDSOUTPTO-AMPRLINE-OR+26V-26VMyth 1 right channelm1-ampr.schTO-AMPRLINE-OR+26V-26VANA1ANA2LEDSOUTPMyth 1 keyboardm1-keyb.schANA1ANA2LEDSOUTPP1A2 X 20KVolume controlSPHINX Myth 1 Service Manual14 Power SupplyC28100NC25100NC26100NC27100NC30100NC29100NC46100NC45100NC32100NC33100NC34100NC37100ND221N4007D231N4007D241N4007D251N4007D271N4007D261N4007+C312200U/63V+C382200U/63VVoutVinGNDU17818DGND+18V+26V-26VD281N4007D291N4007D301N4007D311N4007+5V_OUTGRBLUBLAWIRE/BRPR2PR3PR4PR1KAST2ES4VI2VI1SW1A115_230SW1B115_230E$23E$22KAST1C51100NMOTOCHASMOTOR2MOTOR1SPHINX Myth 1 Service Manual15 Input / OutputR42L1MR42R1MR43R1MR43L1MR44R1MR44L1MR47R475RR45L1MR45R1MR28L47RR41L1MR40R1MR40L1MR46L1MR41R1MR28R47RR47L475RR46R1MR48R1MR27R47RR27L47RR48L1ML2/L1AL2/L1BTUNER/CD1ALINE_OUTATUNER/CD1BLINE_OUTBU$14.1AU$14.2ATAPE1BTAPE1ACN1AGND+REL1MT2-24V+REL2MT2-24V+REL3MT2-24V+REL4MT2-24V+REL7MT2-24V+REL8MT2-24V+REL5MT2-24V+REL6MT2-24V+REL10MT2-24VLINE2LINE1TUNERCDLINE4LINE3VIDEOTAPE INTAPE OUTTO-AMPLTO-AMPRR29L1MR29R1MAGNDAGNDAGNDLINE-ORLINE-OLR26R4R99R26L4R99HPRHPLD81N4148D91N4148D101N4148D111N4148D61N4148D131N4148D51N4148D121N4148D151N4148C24220NR251MAGNDR712K7R722K7OPTO1AMP_PHDIODOPTO2AMP_PHDIOD+18V1234567891011121314151617181920212223242526CN2HD-26HPRHPLHPGNDHPGND+12V+12V+18V+18VGNDGNDGNDRL3RL4RL1RL2RCDRTURVIDEORTAPEOPTOOUTRELCOMRLINEOUTOPTOOUTMOTOR2MOTOR1L2L1TUNERCDL4L3VIDEOTAPELINEOUTSPHINX Myth 1 Se