Garrard-401-tt-sm维修电路图 手册.pdf
RadioFans.CN GARRARD MODEL 401 TRANSCRIPTION TURNTABLE Instruction Manual GARRARD ENGINEERING LIMITED NEWCASTLE STREET SWINDON WILTSHIRE RadioFans.CN As the owner of this Garrard Model 401 Transcription Turntable you have 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 take care of your Model 401 but, if you require any further advice, please do not hesitate to contact your Garrard Agent, or our Technical Service Department at Kembrey Street, Swindon, Wiltshire, Telephone Number Swindon (0793) 6211. Telex 44180. This manual is supplied with Model 401, Serial No. . preface 2 RadioFans.CN 3 THE GARRARD MODEL 401 TRANSCRIPTION TURNTABLE RadioFans.CN page 4general information page 5technical specifications page 6operation page 7maintenance page 8 adjustments page 11installation page 14servicing page 15spare parts, diagrams page 17spare parts list The Garrard Model 401 is the culmination of half a century of experi- ence in the design and manufacture of high quality record playing equipment and has the elegant appearance characteristic of the best British engineering products. The superlative performance of this model is achieved by such fea- tures as a heavy, balanced turntable with a robust, super-finished spindle and a sturdy intermediate driving wheel. Each speed can be set precisely by means of a special eddy current braking 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 full instructions. contents general information 4 RadioFans.CN Turntable: Diecast aluminium with an anti-static rubber mat and stroboscopic engraving on rim for 331/3, 45 and 78 rev/min at 50 c/s. A version for 60 c/s is also available. It is accurately balanced, has a diameter of 12 in (305 mm) and weighs approximately 6 lb (2.5 Kg). Base Plate: Die cast aluminium, ribbed for rigidity. Motor Shaded-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 is required 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.s Rumble: Negligible Insulation: Tested at 1500 volts ac. for one minute between motor windings and frame 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 plate Weight: 17 1/2lb (7.9kg) technical specifications 5 Measured with Gaumont Kalee Type 1740 meter with 3000c/s constant frequency record at 331/3, 45 and 78 rev/min RadioFans.CN Referring to Diagram 1. (1)Place a record on the turntable. (2)Turn the speed selector to the setting appropriate for the record 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 the rim of the turntable, appropriate to the speed for which you are setting, appear to remain stationary. The lower marking represents 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 for approximately 10 minutes so that it may reach its normal operating temperature. Speed should always be re-checked after changing the speed range. To protect the intermediate wheel, the speed selector is interlocked with the motor switch and cannot be operated unless the motor is switched off. Do not hold the turntable stationary whilst the motor is switched on and never disconnect the power supply until the motor has been switched off operation 6 Motor Switch Speed Adjuster Speed Selector Stroboscopic Markings Diagram 1 RadioFans.CN The bearings of the motor, intermediate wheel and turntable spindle are of the oil-retaining type and rarely need lubrication. When the need for oil becomes apparent, lift off the turntable and lubricate these bearings sparingly with the oil supplied. The motor must be switched off before removing the turntable or replacing it on its spindle. If any difficulty is experienced in removing the turntable an assistant should give the spindle top a downward tap with a small piece of wood, such as the handle of a screwdriver, whilst the turntable is being lifted. The top bearing of the Motor can be reached through one of the holes in the aluminium brake disc, see Diagram 2. The top bearing of the Intermediate Wheel should have one drop of oil only applied to it. The bearings of the Turntable Spindle are lubricated by saturating the felt pad surrounding the spindle and by removing the screw from the top of the housing to 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 wheel which must be kept clean by wiping it with a clean, dry cloth, the lever pivots on the underside of the base plate which should be lightly oiled and the sliding sur- faces which should be smeared with a light grease. maintenance 7 Diagram 2 RadioFans.CN The Model 401 has been designed to give reliable service over long periods of use. These instructions have been included to enable you to make the few minor adjustments which may become necessary after a prolonged period. Turntable Speed When set to 331/3rev/min. with the pointer of the speed adjuster central, the lower stroboscopic turntable markings should appear to remain stationary when viewed in the light of the neon lamp. If this is not the case, remove the turntable, insert a suitable screwdriver through the small hole in the base plate and turn the speed adjust- ment screw C on Diagram 3, slightly clockwise if the speed is high and counterclockwise if it is low. Having made this adjustment, the other two speeds should also be correct within close limits. If the speed adjuster does not enable the correct speed to be set check that the position of the intermediate wheel is that specified under the heading Intermediate Wheel. Should this be satisfactory and turntable speed is too high, slacken the large nut on the under- side of the lug attached to the motor casting and which locks the magnet carrier pivot. Then, inserting a screwdriver into the slot at the lower end of the pivot A, situated on the left of the screw mentioned in 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 a red spot, is available to increase fast speed range. adjustments 8 diagram 3 RadioFans.CN Intermediate Wheel The height of this rubber-tyred wheel in relation to the motor pulley should be such that there is about 1/32 in(1 mm) clearance between the tyre and an adjacent pulley step at any speed setting. If there is not, slacken the three screws at the top of the motor pulley B and raise or lower the pulley before re-tightening the screws equally. Turntable Brake This 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 screws holding the brake pad lever E, on the underside of the base plate, move the lever outwards slightly, then re-tighten the screws. The action of the switch will be impeded if the brake is set too far out. Power Supply Voltage Range If 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 volt age 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 lamp below 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 shown in the spares list at the end of this manual. adjustments 9 diagram 4 RadioFans.CN Power Supply Frequency If 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 Spares Department 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 the replacement pulley after checking its identification; brass for 60 c/s and partial nickel plate for 50 c/s, then after checking its position re-tighten the three screws equally. The operating frequency for the stroboscopic marking on the turntable, in cycles per second, is stamped on its underside. This will be either 50 or 60. Finally it will probably be necessary to make the adjustments mentioned under the heading Turntable Speed. Model 401 Neon Lamp Note that Model 401 may be fitted with a neon lamp other than that referred to in the text, line diagrams and parts list of this booklet This lamp is fitted across 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 both 110/125 and 220/250 AC voltage ranges. See page 20. adjustments 10 RadioFans.CN The Model 401 should be mounted on a board at least 1/2 in (13 mm) thick, or a substantial metal plate, which is also large enough to accommodate the chosen pickup arm. The board or plate must be cut and drilled in accordance with the instructions on the template supplied or, if preferred, with the dimensions on Diagram 8. When the board or plate has been cut, take off the nut holding the cover of the connecting block shown on Diagram 7, remove the cover and attach one end of a power supply to the screwed terminals as shown on Diagram 4 securing it by means of the adjacent clip; then check that the wire links are in the correct position for the power supply voltage and replace the cover. Solder a lead for earthing purposes to the tag, shown on Diagram 7, then screw the four fixing studs into the base plate, at the place shown on the same diagram and the three other corresponding holes in the base plate, until the spring clips stop them. The leads are then passed through the cut-out in the mounting board from the top and the base plate secured to the board by means of the four studs, in the manner shown on Diagram 6. Release both Transit Screws completely before fitting the Turntable. These have red heads for identification and tighten the clamping plate which secures the motor to its yoke for protection dur- ing transit. They are released by turning them fully counterclockwise using a screwdriver. Re-tighten the screws before transporting the unit at any future time. Take out both screws holding the cover of the neon lamp to the top of the base plate then detach the cover being careful to retain the spring washers beneath the screw heads. Referring to Diagram 5, move the lower moulding backwards, towards the turntable spindle until it can be lifted clear of the base plate complete with the neon lamp 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 base plate. Finally, connect to the power supply and to a good earth 11 RadioFans.CN installation 12 RadioFans.CN installation 13 RadioFans.CN N.B. The power supply should be disconnected for all servicing except voltage check. Numbers in brackets correspond to those on Diagrams 9 and 10. FaultCauseAction Turntable fails to re-1. No power supply reaching motor.Check supply with voltmeter. If correct, volve.check action of motor switch (52), tightness of 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 necesary by speed control 2. Wire links (40) set incorrectly for powerCheck against diagram on cover of change-over supply voltage.block or Diagram 4 Turntable 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 chart 14 RadioFans.CN spare parts 1-23 15 RadioFans.CN spare parts 24-60 16 RadioFans.CN Ref.GarrardRef.Garrard No.Part No.Description of PartNo.Part No. Description of Part 171510Base Plate1340085Screw, short, for Lever Pivot 271902Control Plate with Panel41012Nut 71269Control Panel only42501Spring Washer 371505Controls (3)71319Pivot Bush 471277Neon Lamp Housing40946Pivot Washer 71276Cover for Lamp Housing1471274Motor Pulley, 50 c/s (Partially nickel 540023Screws, fixing
