Scott-PS-17-PS-47-PS-57-PS-67-PS-76-PS-87-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL stereo turntables PS17 PS47 PS51 PS 117 PS11 PS87 (ffi SCOTT The Name to listen to. H. H. SCOTT, INC., 20 Commerce Way, Woburn, Mass. 01801, Tel. 617 933-8800 RadioFans.CN 收音机爱 好者资料库 1. Notice: The following safety precautions must be followed to assure continued reliability and safet

2、y against fire and shock hazard: 1) Replacement parts used during servicing of this appliance must have identical characteristics as those offered and recommended by n. H. Scott, Inc. 2) Satisfactory and approved service procedures dictate that ALL PARTS, no matter how apparently unimportant, be rep

3、laced exactly as in the original design. EXAMPLES: a) Braided glass tubing over resistors, b) Heatsinks on transistors. c) Ceramic tube spacers. d) All mechanical parts, i,e, covers, brackets, etc. 3) A dielectric test is to be performed on each appliance following the re-assembly and before returni

4、ng the unit to the customer. 4) The dielectric test, to be performed on H. H. Scott, Inc. electronic components serviced in ,the U. s. and Canada for use in these countries, shall consist of not less than the following:* 1) A dielectric tester designed to supply not less than 1100 volts at 60 Hz and

5、 employing leakage current indicator/s is to be used, 2) The tester is to be connected per the instructions enclosed with the instrument, or as follows: a) The tester is connected to the power line receptacle, and the power switch is turned on. b) Sufficient time is allowed for the tester supply to

6、stabilize and then the output voltage is adjusted for 1080 volts. c) Leads of the tester, usually marked GND and HV, are connected between chassis ground and both blades of the male plug of the power cord. d) Switch tester to 11test11 and observe leakage indicator. LEAKAGE CURRENT MUST NOT EXCEED 0.

7、5 mA. * Dielectric tests made by service personnel in countries other than United States and Canada must use test equipment and procedures specified by the safety agency serving that country. CAUTION: Remove head shell from tone arm before applying dielectric test. RadioFans.CN 收音机爱 好者资料库 2. Specifi

8、cations: Speed control% Wow/flutter (WRMS) S/N ratfo Tone arm length Stylus pressure range Anti skating range Power consumption Drive system PS-17 PS-47 None +3 0.07% 0.05% 52 dB 55 dB 213mm 210mm 1.5-4 grams 1-4 grams 0-4 grams 0-4 grams 10 Watts 2 Watts Belt Belt Recommended Equipment; 1. AC Vacuu

9、m tube voltmeter. 2. DC Millivolt meter or Dl. 3. Oscilloscope. 4. Volt-Ohm meter. 5. Wow/flutter meter. PS-57 +3 0.05% 55 dB 210mm 1-3 grams 0-4 grams 2 Watts Belt PS-67/87 +3 0,03% 60 dB 210mm 1-3 grams 0-4 grams 11 Watts Direct 6. Broadcast test record. (CBS labs STR 151 or equivalent). 7. Supply

10、 of light machine oil, (not motor oil). 8. Tube of grease. (LUBRIPLITE or equivalent). 9. Suitable hand tools, ca,1es, variable power line transtormer, 10. Suitable line voltage and current monitoring meters. -NOTICE- PS-76 +3 0.04% 60 dB 220mm 1-3 grams 0-3 grams 4 .5 Watts Direct Scott Electronic

11、Components are manufactured with a serial number code to identify the manufacturing plant and the year of manufacture. The following information will explain the code. 1) The first six digits are the unit srial number. 2) The first of the two letter suffix is the manufacturing plant code. 3) The sec

12、ond letter identifies the year of manufacture. A-1975 B-1976 C-1977 D-1978 etc. H. H. Scott, Inc. reserves the right to make changes in model design and technology without giving prior notice. 2 RadioFans.CN 收音机爱 好者资料库 3. General Information This manual has been prepared to cover the various aspects

13、 of servicing six differertt H. ll, Scott, Inc. turntables. Since the cartridge installation and tone arm balance procedures are included in the operator1s manual supplied with each appliance purchased, only a genera 1 procedure ha:; been included he.re. Cartridges are not normally supplied by H. H.

14、 Scott, Inc. All models, except the Model No. PS-17, use a form cf electron- ically controlled DC or AC motor, that provides accurate speed and pitch control, as well as simple electronic switching between the two speeds, 33 1/3 and 45 rpm. The model NOS. PS -17, PS-4 7 and PS-57 are belt dri v,m mo

15、le ls, all others are direct drive. All models are designed for playing a single 12 inc.h (30.48cm) diameter record, and may also be used to play records of smaller diameter. The tone arm will return to rest at the end of each play. 4. Maintenance CAUTION: Before proceeding with any maintenance or s

16、ervice, disconnect power supply cord and provide stylus protection. The tone arm assemblies, used in all models, are essentially maintenance free and require no routine service. The later a 1 bearing consists of a double race, precision ball assembly, adjusted at th.e factory for zero end play. The

17、vertical bearings are precision ball and cone, also pre-adjusted. Adjustment or lubrication is not recommended, Maintenance is not normally required on the models PS-67 PS-76 and PS-87 direct drive models, except for routine pickup stylus inspection and possible replacement. Routine maintenance of t

18、he models PS-17, PS-47 and P3-57 is usually limited to drive belt and stylus inspection and possible replacement. 4.1 Lubrication: Tr:!.ction points in these turntables are lubricated with high quality, extended life lubricants, which will rarely need replace- ment. When the need is apparent, it wil

19、l be necessary to remove the bottom cover, as well as the turntable and turntable mat. Motors are to be re-lubricated with a suitable light machine oil. Other friction points, such as turntable spindle bearings, pivot points and cams, arc to be re-lubricated with high quality white colored grease. A

20、 suitable type is sold in North America under the brand name LUBRIPLATE. NOTE: lt is highly advisable to remove all old lubricant before adding the new, If this is not done, it is possible that the old lubricant will cor.taminate and cause premature failure of the new lubricant, 3 5. Service Adjustm

21、ents (see also troubleshooting guide) 5,1 Turntable Speed: Electronic control models may require service of the control circuits. These can be treated in much the same 11ay as a solid state audio amplifier, 5.2 Pickup Tracking: Should there be a complaint regarding pickup tracking problems, check to

22、 determine that the cartridge is correctly mounted and that the stylus is clean and free of any accumulation of dust, Also check for proper ANTI SKATING adjustment, (refer to cartridge manufacturer Is specification or as noted in 5 .10 of this manua 1). 5.3 Pickup Height: All models, except the PS-7

23、6, include the AUTOMATIC RETUR at end of play feature, actuated by levers and cams. The distance between pickup stylus and top surface of a single record in the arm return mode is typically 5/16 inch (8 mm), Adjustment of this elevation is accomplished by means of cam screws, screw adjustment, or in

24、 some models, only by bending a metal tab on the lift arm. CAtrrION: Before attempting any adjustment that requires bending of components, study the exploded view for the particular model, to determine that no parts are missing or damaged. 5.4 Pickup Lowering Position: The models PS-57 and PS-87 are

25、 fully automatic types with mechanism to start and lower the pickup stylus onto the lead-in. groove of any standard record. These models are set at the factory for proper pickup lowering, automatic return and shut-off, Should improper operation develop, it will be an indication that the tone arm has

26、 been forced during a cycle, or that the tone arm lever set screws have been loosened. Usually, proper adjustment can be made quite simply by loosening the two set screws, (identified as 1173-411 in exploded view) re-adjusting the tone arm lowering position on a record, and then tightening the two s

27、crews. Fine adjustment is done with adjusting screw 73-3. Minor adjustment can be made with this screw only. 4 5.5 Tone Arm Return, Cut/Reject Control All models, except PS-76, are equipped with an automatic arm return mechanism, ganged with a control button marked CUT or REJECT. These features allo

28、w minimum operator attention and permit record interruption and motor shut-off at any time. The power is shut off when the tone arm is returned to the .REST position. As in item 5.4, proper adjustment of these controls has been set at the factory. Re-adjustment procedures will follow as in item 5.4.

29、 5,6 Single/Repeat: The del Nos. PS-57 and PS-87 include a feature, which permits the operator to select whether to play the record through once and have the player shut down, or to continue with repeat playing of the record until intentionally interrupted. Since operation of this control moves only

30、 levers df fixed size and shape, failure will usually be caused by binding or damaged parts. To correct, clean and re-lubricate or replace parts. 5.7 Record Size Selector: The fully automatic models include a lever marked SIZE SELECTOR with three positions, 17, 25 and 30. These are the approximate c

31、m equivalent to 7, 10 and 12 inch records. This simple system of levers and cams will require minimum maintenance and little, if any, adjustment. 5.8 Anti Skating: An anti skating mechanism is included as an integral part of the tone arm base in all models. This device works on the principal of spri

32、ng loading the tone arm to compensate for forces applied to the stylus by the rotating disc, Service of this mechanism is limited to replacement of parts only with factory supplied original equipment types, or to replacement of the complete tone arm assembly. Lubricant is not used in servicing the a

33、nti skating mechanism. FOR PROPER SETTING OF THE ANTI SKATING CONTROL, REFER TO THE CARTRIDGE MANU1ACTURRR IS SPECIFICATIONS. These specifications supersede the anti skating adjustntent outlined in the opera tor Is manual, or in item 5. 10, No. 6 of this rr.anua 1. 5 5.9 Cartridge Installation: 1. A

34、 cartridge is not generally supplied as part of these turntables, so that the customer has complete choice of cartridge brand and type. 2. Suitable cartridges are any standard 12.7mm/l/2 type (ceramic or prefer.Cbly magnetic) with a !racking Force of 1.5 to 3.0 grams. 3. Read instructions supplied w

35、ith cartridge thoroughly before proceeding. 4. Refer to Fig. 1 (please note that mounting screws, washers and nuts are supplied with head shell for mounting the cartridge). 5. Unpack the cartridge and c1nefully remove stylus guard (if so equipped) and stylus. Carefully place stylus and guard in a sa

36、fe lccation. 6. Using tweezers or long nose pliers, carefully connect wires following the color code as shown in figure 1. 7. Using screws, washers and nuts (supplied), loosely install cartridge to the head shell as shown in Fig. 1. (a small flat screwdriver is required). Do not fully tighten screws

37、. Replace stylus in cartridge. 8. Install the head shell onto the tone arm upside down (with stylus tip upward) and rotate lock nut clockwise until head shell is tightly installed, MOUNTING SCREWS WASHERS COLOR CODE L WHITE LG SLUE R !ED AG CAEEN LEAD WIRES tt- TERMINAL CLIPS STYLUS Fig. l. Typical

38、pin connections on the rear of a stereo c;anridge Left Signal WHITE Left Ground BLUE Right Signal RED Right Grourd GREEN Note: Use your terminal clips in connecting lead wires to cartridge pins. Do Not use solder on cartridge pins. 9. Adjust cartridge in head shell by sliding cartridge back and fort

39、h until the stylus tip is positioned 52mm (2 1/16 inches)+ 1.6mm (1/16 inch) from the small rubber ring at the connecting point of head shell and tone arm. Make certain that cartridge is square in the head shell. 10, Carefully remove head shell without changing cartridge position and tighten the mou

40、nting screws. 11. Re-install the head shell on the tone arm in its normal position. 6 5.10 Stylus Pressure Adjustment: For proper performance of your phono cartridge. the stylus pressure must be adjusted to the tracking force recommended by the cartridge manufacturer. Proceed as follows: 1. Unlock t

41、one arm hook, also remove cartridge stylus cover. 2. Start motor. Ensure that the cue lever is in down p:,sition so that the arm can move freely. Set anti-skate control to 1011 NOTE: If the arm lifter is sticky in operation at the beginning, lightly push down on the arm lifter with your fingers. 3.

42、Zero balance the arm by rotating the counter weight until the arm is laterally balanced. 4. Now adjust only the counter weight dial ring so that the dial position 011 lines up with the RED line marked on te tone arm, being careful not to rotate the counter weight, S. Finally, rotate the counter weig

43、ht until the dial indicates the manufacturers specified stylus pressure. 6. Normally, the anti-skate adjustment is set to the same number as the stylus tracking force. The anti-skate setting for elliptical or Shibata styli should be set to the. cartridge manufacturers specification. _ otl!r ),Veight

44、 D , o,unter Weigh . TOR DRIVE BLOCK. It should be noted that the turntable diecasting is an integral part of the motor system, acting as a flywheel to 11smooth out the effect of electrical pulses applied to the motor. 9 TROUBLESHOOTING GUIDE FAULT CAUSE CORRECTION Turntable Speed 1) No voltage to t

45、urntable Check power. supply out let. Check power cord and power fuse in electronic controlled models. a) Will not start: 2) Motor bearings binding or frozen. Check assembly for mechanical damage. Repair, lubricate Nos. 1, 2, 3 , or replace as indicated. 4, 6, 8, 9 and 10. 3) Fuse open in electronic

46、 models. Replace fuse, repair electronics as required. b) Turns slow: 4) Drive belt defective or missing. Determine cause of defect and orrect. Replace belt. Nos. 2, 4, 5, 5) Oil on belt. Determine cause of oil, correct and replace belt. 7, 8, 11 and 13. -.- Winding resistance of DC motors, approx.

47、15 ohms with c) Turns fast: 6) Motor winding open. rotor stalled. AC motors measure 400 ohms between black Nos . 8, 11 and and white leads; 640 ohms between black and red leads. 13. Replace motor as required. 0 d) Speed changes Winding resistance of DC motor freQuency generator without apparent wind

48、ing is 80 ohms (PS 47 l former 870645-1 PS-47/PS-57 8 Power transformer 871076 PS-67 /PS-87 49 Fibre washer, 5 X lQ X 0.2t PS-17 49 Fibre washer, 5 X 10 X 0.3t PS-47 49 Clutch lever 891432 PS-57 /67 /87 14 PARTS LIST DRAWING DP.SCR IPTION NO. PART NO. REMARKS so Fibre washer, 5 X 10 X lt PS-17/PS-47

49、 50 Clutch lever spring 891474 PS-57 /67 /87 51 E-washer, E-4 PS-17 /PS-47 51 Fibre washer, 6 X 13 x o. St PS-57/67/87 52 Switch lever 890621 PS-17 /PS-47 52 Switch lever assf 891016 PS-57/67/87 53 Nut, M-3 PS-17 /PS-47 53 Clutch lever coil spring 891947 PS-57 /67 /87 54 Screw, FM+ 3 x 8 PS-17/47/67/87 55 Motor cover 892943 PS-17/47/57 55 Capacitor 892428 PS-67 /PS-87 56 Screw_ , FM