Garrard-401-tt-sm维修电路原理图.pdf

RadioFans.CN 收音机爱 好者资料库GARRARDMODEL 401TRANSCRIPTION TURNTABLEInstruction ManualGARRARD ENGINEERING LIMITED NEWCASTLE STREET SWINDON WILTSHIRERadioFans.CN 收音机爱 好者资料库As the owner of this Garrard Model 401 Transcription Turntable youhave a product supreme in its class which will maintain its high standard of performance throughout many years of use, with the minimum of attention. This manual will help you to operate and takecare of your Model 401 but, if you require any further advice, pleasedo not hesitate to contact your Garrard Agent, or our TechnicalService Department at Kembrey Street, Swindon, Wiltshire,Telephone Number Swindon (0793) 6211. Telex 44180.This manual is supplied with Model 401, Serial No. .preface23THE GARRARD MODEL 401 TRANSCRIPTION TURNTABLEpage 4general informationpage 5technical specificationspage 6operationpage 7maintenancepage 8 adjustmentspage 11installationpage 14servicingpage 15spare parts, diagramspage 17spare parts listThe Garrard Model 401 is the culmination of half a century of experi-ence in the design and manufacture of high quality record playingequipment and has the elegant appearance characteristic of the bestBritish engineering products.The superlative performance of this model is achieved by such fea-tures as a heavy, balanced turntable with a robust, super-finishedspindle and a sturdy intermediate driving wheel.Each speed can be set precisely by means of a special eddy currentbraking system and stroboscopic markings on the turntable illuminat-ed by a high-intensity neon lamp.Every Model 401 is supplied complete with a set of fixing screws, an adaptor for playing records with 1.5in (38 mm) centre holes, lubricating oil, a mounting template, an individual test report and fullinstructions.contentsgeneral information4Turntable:Diecast aluminium with an anti-static rubber mat and stroboscopicengraving on rim for 331/3, 45 and 78 rev/min at 50 c/s. A version for60 c/s is also available. It is accurately balanced, has a diameter of12 in (305 mm) and weighs approximately 6 lb (2.5 Kg).Base Plate:Die cast aluminium, ribbed for rigidity.MotorShaded-pole induction type, magnetically screened by a heavy cast-iron case and suspended on 6 tensioned springs. The rotor is dynam-ically balanced within exceptionally close limits.Voltage:Dual range-110/125 and 220/250 volts a.c. A separate neon lamp isrequired for each range.Frequency:50 or 60 c/s, dependent on the motor pulley and turntable fitted.Alternative pulley and turntable available.Power Consumption:Approximately 12 watts.Wow:Less than 0.08% r.m.s.Flutter:Less than 0.04%r.m.sRumble:NegligibleInsulation:Tested at 1500 volts ac. for one minute between motor windings andframe and at 500 volts d.c. with an insulation test meter when a resis-tance greater than 20 Megohms must be registered.Motor Switch:Double-pole, fitted with a switch click supressor across each pole.Speed Ranges:31.9 to 34.6, 43.2 to 46.8 and 75 to 81 rev/min. approximately.Size:14 5/8in (371mm) from back to front; 13 3/4in (349mm) wide; 2 in(51mm) above and 3 15/16in (100mm) below underside of base plateWeight:17 1/2lb (7.9kg)technical specifications5Measured with Gaumont KaleeType 1740 meter with 3000c/sconstant frequency record at331/3, 45 and 78 rev/minReferring to Diagram 1.(1)Place a record on the turntable.(2)Turn the speed selector to the setting appropriate for therecord to be played, or check that this has already been done.(3)Turn the motor switch control clockwise to start the turntable. This operation also switches on the indicator lamp.(4)To set speed accurately, place a record on the turntable and switch on, as already described. Place pickup on record and turn the speed adjuster until the stroboscopic markings on therim of the turntable, appropriate to the speed for which you are setting, appear to remain stationary. The lower markingrepresents 331/3rev/mm., the centre one 45 rev/mm. and the upper one 78 rev/mm.For highly accurate work, it is desirable to let the motor run forapproximately 10 minutes so that it may reach its normal operatingtemperature. Speed should always be re-checked after changing thespeed range.To protect the intermediate wheel, the speed selector is interlockedwith the motor switch and cannot be operated unless the motor isswitched off.Do not hold the turntable stationary whilst the motor is switched onand never disconnect the power supply until the motor has beenswitched offoperation6Motor Switch Speed Adjuster Speed Selector Stroboscopic MarkingsDiagram 1The bearings of the motor, intermediate wheel and turntable spindle are of theoil-retaining type and rarely need lubrication. When the need for oil becomesapparent, lift off the turntable and lubricate these bearings sparingly with the oilsupplied. The motor must be switched off before removing the turntable orreplacing it on its spindle. If any difficulty is experienced in removing theturntable an assistant should give the spindle top a downward tap with a smallpiece of wood, such as the handle of a screwdriver, whilst the turntable is beinglifted.The top bearing of the Motor can be reached through one of the holes in thealuminium brake disc, see Diagram 2.The top bearing of the Intermediate Wheel should have one drop of oil onlyapplied to it.The bearings of the Turntable Spindle are lubricated by saturating the felt padsurrounding the spindle and by removing the screw from the top of the housingto apply a few drops of oil through the hole then revealed.After lubrication, it is essential to remove every trace of oil from the motor pulley,intermediate wheel and the inside of the turntable rim.Further points for periodical attention are the periphery of the intermediate wheelwhich must be kept clean by wiping it with a clean, dry cloth, the lever pivots onthe underside of the base plate which should be lightly oiled and the sliding sur-faces which should be smeared with a light grease.maintenance7Diagram 2The Model 401 has been designed to give reliable service over longperiods of use. These instructions have been included to enable youto make the few minor adjustments which may become necessaryafter a prolonged period.Turntable SpeedWhen set to 331/3rev/min. with the pointer of the speed adjustercentral, the lower stroboscopic turntable markings should appear toremain stationary when viewed in the light of the neon lamp. If this isnot the case, remove the turntable, insert a suitable screwdriverthrough the small hole in the base plate and turn the speed adjust-ment screw C on Diagram 3, slightly clockwise if the speed is highand counterclockwise if it is low. Having made this adjustment, theother two speeds should also be correct within close limits.If the speed adjuster does not enable the correct speed to be setcheck that the position of the intermediate wheel is that specifiedunder the heading Intermediate Wheel. Should this be satisfactoryand turntable speed is too high, slacken the large nut on the under-side of the lug attached to the motor casting and which locks themagnet carrier pivot. Then, inserting a screwdriver into the slot at thelower end of the pivot A, situated on the left of the screw mentionedin the previous paragraph, turn the pivot a fraction of a turn in a coun-terclockwise direction. If the speed is too low turn the pivot in a clock-wise direction. Always re-tighten the nut after making an adjustment.If, when using the speed adjuster control, there is difficulty in obtain-ing fast turntable speed, an alternative motor pulley, identified by ared spot, is available to increase fast speed range.adjustments8diagram 3Intermediate WheelThe height of this rubber-tyred wheel in relation to the motor pulleyshould be such that there is about 1/32 in(1 mm) clearance betweenthe tyre and an adjacent pulley step at any speed setting. If there isnot, slacken the three screws at the top of the motor pulley B andraise or lower the pulley before re-tightening the screws equally.Turntable BrakeThis will bring the turntable to rest within 2 or 3 revolutions of switch-ing off. If it continues to turn for a longer period slacken both screwsholding the brake pad lever E, on the underside of the base plate,move the lever outwards slightly, then re-tighten the screws. Theaction of the switch will be impeded if the brake is set too far out.Power Supply Voltage RangeIf this is altered, say from 220/250 volts to 110/125 volts, the two fol-lowing adjustments will be required.(1)After disconnecting the power supply and removing the voltage changeover and connecting block cover, alter the posi-tions of the wire links in accordance with Diagram 4.(2)With the supply still disconnected, remove the neon lampbelow cover D, as instructed in the Installation section, and fit a suitable replacement which is available from our Spares Department. The reference numbers of both lamps are shownin the spares list at the end of this manual.adjustments9diagram 4Power Supply FrequencyIf this is altered, say from 50 c/s to 60 c/s, it will be necessary to fit the alterna-tive motor pulley and turntable, both of which are available from our SparesDepartment and referred to in the spares list at the end of this manual.To fit the pulley, remove the turntable, slacken the three small screws at the bot-tom of the stepped pulley and lift the pulley off the motor spindle. Do not con-fuse this collar with that on the aluminium brake disc below the pulley. Fit thereplacement pulley after checking its identification; brass for 60 c/s and partialnickel plate for 50 c/s, then after checking its position re-tighten the threescrews equally. The operating frequency for the stroboscopic marking on theturntable, in cycles per second, is stamped on its underside. This will be either50 or 60.Finally it will probably be necessary to make the adjustments mentioned underthe heading Turntable Speed.Model 401 Neon LampNote that Model 401 may be fitted with a neon lamp other than that referredto in the text, line diagrams and parts list of this booklet This lamp is fittedacross the front of the unit, illuminating the stroboscopic turntable directly,as in the photograph on page 3 and it is wired so that it is suitable for both110/125 and 220/250 AC voltage ranges. See page 20.adjustments10The Model 401 should be mounted on a board at least 1/2 in (13mm) thick, or a substantial metal plate, which is also large enough toaccommodate the chosen pickup arm. The board or plate must becut and drilled in accordance with the instructions on the templatesupplied or, if preferred, with the dimensions on Diagram 8. When theboard or plate has been cut, take off the nut holding the cover of theconnecting block shown on Diagram 7, remove the cover and attachone end of a power supply to the screwed terminals as shown onDiagram 4 securing it by means of the adjacent clip; then check thatthe wire links are in the correct position for the power supply voltageand replace the cover. Solder a lead for earthing purposes to the tag,shown on Diagram 7, then screw the four fixing studs into the baseplate, at the place shown on the same diagram and the three othercorresponding holes in the base plate, until the spring clips stopthem.The leads are then passed through the cut-out in the mounting boardfrom the top and the base plate secured to the board by means of thefour studs, in the manner shown on Diagram 6.Release both Transit Screws completely before fitting theTurntable. These have red heads for identification and tighten theclamping plate which secures the motor to its yoke for protection dur-ing transit. They are released by turning them fully counterclockwiseusing a screwdriver. Re-tighten the screws before transporting theunit at any future time.Take out both screws holding the cover of the neon lamp to the topof the base plate then detach the cover being careful to retain thespring washers beneath the screw heads. Referring to Diagram 5,move the lower moulding backwards, towards the turntable spindleuntil it can be lifted clear of the base plate complete with the neonlamp in its holder. Do not lift it so far that the leads to the lamp hold-er are strained. Unscrew the lamp from its holder. Check that the volt-age range marked on its metal cap is correct for the power supply.Re-assemble in the reverse order taking care to avoid over-tighten-ing the screws holding the lower moulding and its cover to the baseplate. Finally, connect to the power supply and to a good earth11installation12installation13N.B. The power supply should be disconnected for all servicing except voltage check. Numbers in brackets correspond to those on Diagrams 9 and 10.FaultCauseActionTurntable fails to re-1. No power supply reaching motor.Check supply with voltmeter. If correct,volve.check action of motor switch (52), tightnessof wire links (40) and all connections.2. Discontinuity of motor coil winding(s).Check resistance with ohm-meter. Connected for 220/250 volts, reading should be approximately 400 ohms and for 110/125 volts, approximately 100 ohms. Replace coil(s) if necessary.3. Intermediate wheel tension spring (15)Replace or re-secure spring.stretched or detached.Turntable speed too fast1. Incorrect motor pulley (14) for powerCheck pulleys identification: partially nickel or slow for correctionsupply frequency.plated 50 c/s, brass 60 c/s. Replace if necesaryby speed control2. Wire links (40) set incorrectly for powerCheck against diagram on cover of change-oversupply voltage.block or Diagram 4Turntable speed varies1. Driving surfaces of motor pulley (14),Wipe surfaces with a clean dry cloth.with audible effect.intermediate wheel (16) and/or turntable(Wow or Flutter)contaminated with lubricant.2. Intermediate wheel (16) height incorrect.See Adjustments page 8.3. Loose nut on magnet carrier (10).Tighten nut.Rumbling sound1. Power supply lead too heavy or pulledReplace or re-route lead.through speaker(s).tight.2. Intermediate wheel (16) height incorrect.See Adjustments page 8.3. Motor transit screws (48) not released.Release screws. See Installation, page 11.service chart14spare parts 1-2315spare parts 24-6016Ref.GarrardRef.GarrardNo.Part No.Description of PartNo.Part No. Description of Part171510Base Plate1340085Screw, short, for Lever Pivot271902Control Plate with Panel41012Nut71269Control Panel only42501Spring Washer371505Controls (3)71319Pivot Bush471277Neon Lamp Housing40946Pivot Washer71276Cover for Lamp Housing1471274Motor Pulley, 50 c/s (Partially nickel540023Screws, fixing Housing (2)plated)42501Spring Washers (2)71670Motor Pulley, 60 c/s (Brass)40501Plain Washers (2)72090Collar, for Pulley, with Screws671345Neon Lamp Holder, below Cover71346Screws, for Collar (3)771329/01Neon Lamp, 220/250 volts. Philips Type1541792Tension Spring, for IntermediateGL42M or equivalentWheel71329/02Neon Lamp, 110/125 volts. Philips Type1651858Intermediate WheelGL15M or equivalent1771311Top Plate for Support Bracket844249Screws, long, for Lever Pivots (2)71314Support Bracket with Sp