Jvc-QLF-6-Service-Manual电路原理图.pdf
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1、JVCMODELtaL-FeQUARTZ FULLY AUTOMATICTURNTABLENo. 2464. FEB. 1979ContentsPages1. Specifications .2. ServicePrecautions.Features.4. NamesofPartsandTheirFunctions.5. Replacement Procedures(1) Stylus.(2) Headshell “.,.(3) Cartridge.(4) Motor.(5) HO/VODampingKnobs “ “ 66. Lubrication(1) HO/VODampingMecha
2、nism .(2) Motor.(3) FullyAutomaticMechanism.7. Adjustment Procedures(1) UARTZ LOCK/PITCH CONTROL Meter .(2) OuartzLockAdjustment . 8Tonearm Section(3) HeadsheliAngle “.(4) TonearmElevator.(5) Overhang .(6) Lead-in.(7) Lead-out.(8) TrackingForce.(9) Anti-skating.(10) HO/VODamping .8. OL-F6BlockDiagra
3、m .9. Troubleshooting Charts(1) Platter does not rotate. . (2) Platter rotates at high speed. .(3) Pitch Control operates abnormally. .10. Exploded Views and Parts List10-(1) Cabinet ed oil-dampedtonearm: 233 mm: 15 mm: 13 - 20 g24 g (when using the providedsub-counterweight)2. Service Precautions.
4、Be sure to use JVC standard parts. When repairing the speed control circuit board con-nect the m938 G motor in order to prevent damageto the transistor used.in the platter drive section. Be sure to adjust motor speed with the u nit levelotherwise fluctuations which make adjustment impos-sible may oc
5、cur. When repairing circuit board with the heat sink re-moved, attach mobile heat-sink to prevent the tran-sistor temperature from rising.CARTRIDGE SECTION(Except for USA, Canada and U.Type : Moving magnet (MD- l025EB)Frequency response : 10 Hz - 25 000 HzOutput : 3 mV (1 kHz)Channel separation : 25
6、 dB (1 kHz)(using the test record TRS-: 47 - 100 k-ohms: 10 x 10 6 cm/dyne (dynamic)30 x 10 6 cm/dyne (static): DT-Zl EB, 0.3 x 0.7 mil.(diamond , elliptical)Optimum tracking force: 1.75 g :!: 0.25 gGENERALPower consumptionDimensionsLoad resistanceComplianceStylusWeightAccessoriesEP adapter: 15W: He
7、ight 14.2 cm (with closedcover)Width 45.6 cmDepth 40.0 cm(Since the dimensions show onlythe design measurements, con-sideration is requ ired wheninstalling the unit in a limitedspace such as a rack , etc.: 11 kg (without the packaging)Sub-counterweight: 1Place the adapter on the centerspindle when p
8、laying a recordhaving a bigger diameter centerhole such as a doughnut record.: 1Design and specifications subject to change without notice.3. Features. Newly developed oil-damped tonearm assures hightrackability.Highly sensitive, new gimbalsupport tonearm system. Double-quartz servo circu it and hig
9、h torque, non-resonance coreless motor give high reliability. Extra-heavy aluminum diecast platter (2 kg includingthe mat, inertia 330 kg/cmHowling margin is greatly improved with the newsuper-compound (type-l) board used as the base.Operation buttons and controls are positioned at thefront for easy
10、 operation. NR-type headshell with minimum resonance is em-ployed.Moving-magnet cartridge with a elliptical stylus.Fine pitch control allows adjustment within:!: 6 %(approx. a half note). Quartz lock/Pitch control meter for convenient speedcheck.Fully automatic mechanism.QL-No. 24644. Names of Parts
11、 and Their FunctionsMatDust coverCenter spindlePlatterFig. 11. OIL DAMPED TONEARMOrdinarily tonearms have a resonance frequency ofbetween 5 to 10Hz. If the peak of the range of atonearm is too high, accurate tracking of the tone-arm with the record groove cannot be obtained be-cause the tonearm reso
12、nates at a frequency generatedby ambient vibrations or sound pressure, or the tone-arm can be influenced by adverse conditions of therecord such as warps, etc. The OIL DAMPEDTONEARM i designed to suppress the range ofresonance by maintaining a low resonant point ofthe tonearm to prevent howling. Wit
13、h this OILDAMPED TONEARM, accurate tracking of therecord groove as well as a good resistant character-istic to howling is possible, thus resulting in an im-proveved SIN ratio. I n order to improve the soundquality, the OIL DAMPED TONEARM plays animportant role.QL-No. 24642. HQ DAMPING knobThis contr
14、ols the horizontal movement of the tone-arm while aiding to keep the tonearm s resonatingpoint low. Set the knob to the same indication num-ber as the optimum tracking force of this unit.3. VQ DAMPING knobThis controls the vertical movement of the tonearmwhile aiding to keep the tonearm s resonating
15、 pointlow. Set the knob to the same indication number asthe optimum tracking force of this unit.4. Speed select knobSelect a proper position of the speed select knob inaccordance with the rpm of the record.33- 1/3 rpm record (LP) . “33“45rpmrecord(EP).45“5. QUARTZ LOCK/PITCH CONTROL select buttonQUA
16、RTZ LOCK:Depress the button to the QUARTZ LOCK position( ) for playing a record at an accurate rotationspeed in the quartz lock mode. In this case, themeter lights green.PITCH CONTROL:Depress the button a second time to obtain theP ITCH CO NT RO L position (-) in order to per-form fine pitch adjustm
17、ent for the sound meetingyour preference. I n this case, the meter I ights orange.6. PITCH CONTROL meterWhen the QUARTZ LOCK/PITCH CONTROLselect button is set to the QUARTZ LOCK positionthe meter is green-lit and the indicator displays “When the QUARTZ LOCK/PITCH CONTROLselect button is set to the P
18、ITCH CONTROL posi-tion , pitch control can be performed by turningthe PITCH CONTROL knob and the meter isorange- I it.#6 % means +6 %b6 % means - 6 %7. PITCH CONTROL knobFine pitch control can be performed with theQUARTZ LOCK/PITCH CONTROL select buttonset to the PITCH CONTROL position. Pitch adjust
19、-ment range is :!: 6 %. The indicator in the meterdeflecting to the left (#) from the center (0) indi-cates an increase to the accurate 33- 1/3 or 45 rpmand the deflection to the right (b) means a decrease.8. ANTI-SKATING knobThis device cancels out the centripetal force thatpulls the tonearm to the
20、 center of the platter. Thisprevents the stylus tip from skating toward thecenter of the platter and at the same time eliminatesany excessive stylus tip force on the inner wall ofthe record groove. Use the 8 marked dial when em-ploying a spherical stylus. Use the marked dialwhen employing an ellipti
21、cal stylus or a SHIBATAstylus.Turn the dial to the same number as on the track ingforce dial.9. REPEAT knobDecide how many times you want to re-listen to therecord by using this knob. When you set the knobto “ , the record will continue to play repeatedly.Note: This knob cannot be turned to indicate
22、 from1 - 0 or 0 - 1 if the START button is de-pressed with the power cord disconnectedfrom the outlet. For this, refer to the notein the section “Necessary procedures priorto record playing“ on page 2.10. START/REJECT buttonsWhen you start playing a record, depress theST ART button. The tonearm move
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