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Manuale Technics Sl1200 1ma Pt


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Manuale Technics Sl1200 Prima Parte

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Manuale Technics Sl1200 1ma Pt

  1. 1. Service Manual ORDER NO. SD7908-1601 Turntable System SL-1200MK2 (M), (MC) A WARNING This service literature is designed for experienced repair techmcans only and is not designed for use by the general public. It does no contain warnings or c o l o n s to advise non-technical indiv.duals of potential dangers In attempting to service a product. Products powered by electricity should be serviced or repaired only by exper.enced professional technicians. Any attempt to service or repair the product or^products dealt with in this service literature by anyone else could rest.:" in serious injury or death. • The model SL-120OMK2 (M) is available in U.S.A. only. . • The model SL-1200MK2 IMC) is available in Canada only. SPECI FI CATIONS Specifications subject to change w i t h o u t notice. Weight and dimensions shown are approximate. Genera) Rumble: - 5 6 dB (IEC 9 8 A Unweighted) Power supply: 120 V , A C , 50 or 60 Hz - 7 8 dB [IEC 9 8 A Weighted) Power consumption: 12 W Dimensions: 45,3 x 16.2 x 36 cm Tonearm section IW x H x D l (17-27/32"x6-19/64"x14-11/64") Type: Universal Weight: 11 kg (24.3 lb) Effective length: 230mm (9-1/16") Arm height adjustment 31.8—37.8 mm (helicoid part 6 mm) Turntable section range: (l-2l/32"-3-35/64") Type: Quartz direct drive (helicoid part 15/64") Manual turntable Overhang: 15 mm (19/32") Drive method: Direct drive Effective mass: 12 g (without cartridge) Motor: Brushless DC motor Offset angle: 22° Turntable platter: A l u m i n u m diecast Friction: Less than 7 mg (lateral, vertical) Diameter 33.2 cm (13-5/64") Tracking error angle: Within 2°32' (at the outer groove of Weight 2 kg (4.4 lb.) 30 cm 112") record Turntable speeds: 33-1/3 rpm and 45 rpm Within 0°32' [at the inner groove of Pitch control: All quartz-locked ± 8 % range 30 cm (12") record Starting torque: 1,5 kg-cm (1.3 Ib-in) Stylus pressure Build-up adjustment range: 0-2.5 g characteristics: 0.7 s. f r o m standstill to 33-1/3 rpm Applicable cartridge 6-10 g Braking system: Electronic brake weight range: 1 3 . 5 - 1 7 . 5 g (including headshell) Speed change due to {with auxiliary 9.5-13g load torque: 0% within 1.0 kg-cm (0.87 Ib-in) weight): 1 7 — 2 0 . 5 g [including headshell) Wow and flutter: 0 . 0 1 % WRMS* 3.5-6.5 g 0.025% WRMS {JIS C5521) (with shell weight): 1 1 - 1 4 g (including headshell) ±0.035% peak (IEC 9 8 A Weighted) 7.5 g * This rating refers to turntable assembly alone, excluding Head shell weight: effects of record, cartridge or tonarm, but including © Matsushita Electric Industrial Co. Ltd.. platter. Measured by obtaining signal f r o m built-in fre- All rights resanred. unauthorized quency generator of motor assembly. copying and distribution Is • violation erf law Panasonic Company Panasonic Hawaii, Inc. Matsushita Electric of Canada Ltd. Division of Matsushita Electric 320 Waiakamilo Road, Honolulu, 5770 Ambler Drive, Corporation of America Hawaii 96817 Mississauga, Ontario One Panasonic Way, Secaucus, L4W 2T3 New Jersey 07094
  2. 2. SL-1200MK2 • CONTENTS DISASSEMBLY PROCEDURE 2, 3 PRINTED CIRCUIT BOARD 11,12 PARTS I D E N T I F I C A T I O N S 3 A D J U S T M E N T (Electrical) 13 A R M BASE ASSEMBLING PROCEDURE 4 REFERENCE V O L T A G E A N D W A V E F O R M AT EACH )C FEATURES 5 PIN 13, 14 ADJUSTMENTS 6 BLOCK D I A G R A M 15, 16 SCHEMATIC D I A G R A M 7.8 EXPLODED VIEWS 17, 18 REPLACEMENT PARTS LIST (Electrical) 9 R E P L A C E M E N T PARTS LIST (Mechanical) 19 TROUBLESHOOTING 10 EXPLODED VIEWS 20 • DISASSEMBLY PROCEDURE How to remove panel cover 1. Remove head shell and turntabte, 2. Secure arm w i t h arm clamp. 3. Remove 5 screws © of the panel cover as shown in Fig. 1. How to remove stater frame coil and F.G detector coil 4. Remove 3 connectors © and 2 read wires © f r o m power transformer as shown in Fig. 2. 5. Remove 3 screws © of the drive circuit board and 3 screws @ of the stater frame cover as shown in Fig. 2. 6. Disconnect 18 soldered parts © of the stater coil and 4 soldered parts © of the F.G detector coil as show in Fig. 3. 7. Remove 3 screws © of the stater frame ass'y as shown in Fig. 3. Fig. 1 How to remove bottom base ass'y 8. Remove 4 audio insulators. (Counterclockwise rotation) 9. Remove 1 7 screws and spacer © as show in Fig. 4. 10. Remove 11 screws © as shown in Fig. 4. How to remove stylus-illuminator lamp 1 1 . Remove 2 screws © of the stylus-illuminator lamp ass'y as shown in Fig, 5. 12. Remove 1 screw ® as shown in Fig. 6. How to remove neon-illuminator L.E.D. 13. Remove 4 screws © as shown in Fig. 5. 14. Remove 1 circlip © and switch cam © as shown in Fig. 5. 15. Remove strobo-illuminator case. How to remove tone arm 16. Remove 4 screws © of the arm base cover as shown in Fig. 5. 17. Remove 2 screws © of the phono cord clamper as shown in Fig. 5. 18. Remove phono cord clamper as shown in Fig. 7. 19. Remove 2 screws © of the phono cord p.c.b. as shown in Fig. 8, 20. Remove 2 screws © as shown in Fig. 8. 2 1 . Remove 2 screws 0 of the silicon oil dumper as shown in Fig, 8. 22. Remove 3 screws © as shown in Fig. 8. 23. Remove 2 screws © of the tone arm as shown in Fig. 9. m
  3. 3. PARTS IDENTIFICATION Arm-height adjustment ring Hinge Fig. 10 L31 i
  4. 4. • ARM BASE ASSEMBLING PROCEDURE 1. Attach the control ring to the arm base seat, (The 5. Rotate the control ring and make sure that the arm base control ring should be roated counterclockwise.) shifts w i t h i n the range of 0 ~ 6 m m . (See Figs. 14 and 15) 2. Completely tighten the control ring, and then loosen it If it does not shift w i t h i n the specified range, the arm 1.5~2.5 turns to set the scale to " 3 " . (See Fig. 11) base position is deflected. In that case, disassemble the parts and check as specified in step 3. Fig. 14 3. Hold the arm base and set the red line mark on the arm base to the scale ne3r "2", then turn the arm base clockwise. (See Fig. 12) Note: Take care not to allow deflection of the predetermined positions of the control ring and arm base seat. • ADJUSTMENT OF CANCELLER SPRING POSITION if the arm body or PU base plate is replaced, be sure to set the canceller knob to " 0 . 5 " and make sure that the can- Fig. 12 celler spring is in contact with the arm shaft. (See Fig. 16) If the canceller spring is deflected, adjust it as follows: 4. Adjust the arm base so that the red line mark on the arm 1. Clamp the arm on the rest. base is set to the scale "3" of the control ring. Next, 2, Set the canceller knob to " 0 . 5 " . secure the positioning base plate w i t h t w o setscrews. 3, Remove the PU base plate, adjust gear © so that the (See Fig. 13) canceller spring is in the position of Fig, 16. 4. Mount the PU base plate onto the arm base and cru'ck the spring position. Canceller spring Fig. 13 Fifl. 16
  5. 5. SL-1200MK2 • FEATURES Total quartz locked continuous pitch adjustment Y o u can then clearly see the spaces between the selections ±8% on the record, and cue the arm exactly where you want it. Quartz-phase-locked control means almost perfect accuracy The illuminator can then be pushed back down into the of turntable rotation. base. But w i t h most quartz turntables, this accurate control circuit must be cut out when the pitch control is employed. High sensitivity, low mass, gimbal suspension With the S L - 1 2 0 0 M K 2 , however, pitch is variable con- tonearm tinuously (analogically) by up to ±8% under total quartz- The highly sensitive tonearm features a genuine gimbal locked control. The pitch is controlled w i t h a large sliding suspension, the rotational center of which is precisely lever, located to the right of the turntable platter. defined at one point. Bearings are finished to a tolerance of Four lines of platter markings are also provided indicating ±0.5 microns. This and the extra-closeness of pivot center +6%, +3.3%, 0% (exact rated speed) and - 3 . 3 % change to the bearings, result in the minimal friction of 7 mg f r o m rated speed. (0.007 g) for both horizontal and vertical movement. Add to this the low 12-gram effective tonearm mass (including Aluminum diecast cabinet and special heavy rubber headshell, w i t h o u t cartridge) and you have a tonearm com- base material provide acoustic isolation patible with the wide range of compliances found in today's The effects of external vibrations are dramatically reduced cartridges. If you choose a popular high compliance MM in the turntable by this new turntable construction. cartridge, the low range resonance frequency will appear in The turntable base is precision-made aluminum diecast. the correct area to avoid warp frequencies of records, but A n d the underside of the main base is made of a heavy w i t h o u t entering the low end of the audio spectrum. This rubber material (special one-piece molding) which has tonearm is provided with a computer designed, light-weight, excellent vibration resistance and absorbing characteristics. high-rigidity headshell made of single-piece diecast aluminum The turntable platter is also vibration-damped with special- to resist partial vibration. The universal design allows head- ly fabricat rubber matting in the underside along with the shell interchangeability. Contacts are gold-plated. thick turntable sheet (rubber mat). Four targe-size insulating feet also help to absorb unwanted vibrations. Helicoid tonearm height adjustment These features make SL-1 200MK2 ideal for use with extra- A r m height is adjustable within a range of 6 mm to accom- high sound pressure levels. modate varying cartridge dimensions. Adjustments are done w i t h a precision-made helicoid. High torque for fast starts The integral rotor/platter motor delivers 1,5kgcm (1.3lbin) Other fine features starting torque. This high torque gives very quick starts • Quick stops are achieved w i t h a fully electronic braking enabling the platter to reach 33-1/3 rpm w i t h i n 0.7 s. (a system. quarter of a t u r n ) . This is a big advantage in many profes- • A strobe illuminator is provided. The stroboscope is con- sional applications where fast cueing is a necessity. trolled by the extremely stable quartz oscillator, rather than potentially unstable AC line frequency. Stylus illuminator for low-light conditions • Power on/off control built-into strobe illuminator for Y o u ' l l appreciate the stylus illuminator when you are using ease-of-operation. the turntable under low-light conditions. The illuminator • Soft-touch start-stop switch allowing precision control can be hidden in the turntable base, should you need it, capability without the annoyance of accidental operation. simply push a button and it will pop up gently and cast a • Technics integral rotor/platter motor construction with beam of light across the disc in the area traversed by the full cycle detection FG. tonearm. Cross section of SL-1200MK2 Heavy rubber Fig. 17
  6. 6. )MK2 SL-1200MK2 ADJUSTMENTS Pitch control {fine adjustment of speed) (See Figs. Adjustment of the tonearm height (See Fig. 22.) 18 and 19.) The height of the tonearm can be adjusted up to 6 m m , and When the pitch control knob is located at the center of the a scale is provided on the adjust ring tn 0.5 mm increments. position after turning on the power, the green LED indicator Be sure to set the proper arm height using the adjust ring is lit showing the operating condition for the predetermined scale and referring to the table. speed (either 33-1/3 or 45 rpm). The pitch control is variable in a range of 0-~±8%. Height of cartridge (mm) Scale reading on the arm-height (H) adjust ring Adjustment should be done on the basis of indicator scale. 15 0 Figures on the indicator show approximate percentages for 16 1 variable pitch control 17 2 When the strobe dots in 4 stages marked at the peripheral 18 3 edge of the turntable appear to be stationary, variation of 19 4 individual pitches is shown. (See Fig. 19.J 20 5 Note: 21 6 The strobe-illumination of this unit employs a strobe-illu- minator LED synchronized w i t h the precise quartz fre- For example, if the cartridge height is 17.5 m m , the arm- quency. height adjust ring should be positioned at the intermediate For fine adjustment of the turntable speed, be sure to location between 2 and 3 on the scale. (See Fig, 22.) effect the adjustment according to the LED illumination. Caution: The LED illumination is not synchronized with fluorescent Be sure to lock the tonearm by turning the arm lock knob lamps. in the direction indicated by the arrow after finishing the height adjustment for the tonearm. Adjustment of arm-lift height {See Figs. 20 and 21.) The arm-lift height (distance between the stylus tip and Lubrication (See Fig. 23.) record surface when cueing lever is raised) has been A p p l y 2 or 3 drops of oil once after every 2000 hours'of adjusted at the factory before shipping to approximately operation. 8-13mm. The time interval is much longer than that for conventional If the clearance becomes too narrow or too wide, turn the type motors (200-500 hours). adjustment screw clockwise or counterclockwise, while Please purchase original o i l . (Part number is SFWO 010.) pushing the arm lift d o w n . Clockwise rotation —distance between the record and stylus tip is decreased. Counterclockwise rotation —distance between the record and stylus tip is increased. Note: As the adjusting screw has hexagonal head, be sure to make the adjustment while depressing the arm lift, or the screw will not move freely. Also be sure that the hexagonal head retracts correctly into the arm lift when the latter is released. 1 *] . • J 1 Fig. 18 1 • aj, f • • ".I.i11 • • •, al the pilch rjf 1 : ' • • |2) appeafs sraliDnary al ! h * pilfih P D .3 3°* 1 - appears ilitiqnffy ai fhe pilch of 3j 0^ A) appear^ s1a11pnaiy al the pilch of 3 3*fc Fig. 19 LI] m
  7. 7. SdlQIYIdtiC DldCjrdlTI (This schematic diagram may be modified at any time with the development o1 1 , 2 . 3 , 4 , 5 . 6 , 7 POWER SWITCH seoi Braking adjustment- Adjustment of pitch control ± 0 % (Pitch) Pitch Adjustment (GAIN) D201, 202 SVDSR105C Q PITCH LOCK SWITCH SPEED SELECTOR SWITCH PITCH CONTROL VOLUME STRC TT™ : I M P O R T A N T SAFETY NOTICE T H E S H A D E D A R E A ON THIS SCHEMATIC D I A G R A M INCORPORATES SPECIAL FEATURES I M P O R T A N T FC SAFETY. WHEN S E R V I C I N G IT IS :ESSENTîAL T H A T O N L Y M A N U F A C T U R E R SPECIFIED PARTS BE USED FOR T H E CRITICS COMPONENTS IN T H E S H A D E D A R E A S OF THE S C H E M A T I C . m
  8. 8. ! development of new technology.) 7 , 8 K401 1.5K .-A/Vy-i P!l WITCH D204 0205 STYLUS-ILLUMINATOR STROBE ILLUMINATOR NOTO: 1. S 2 0 1 : Speed selector switch (33-1/3 r.p.m,) in 6 S601 : Power switch in " O N " position. " O N " position, (push conditionl 7, The drive circuit IC voltage and wave form are not 2. S202; Speed selector switch (45 r.p.m.) in " O F F " indicated In side the schematic diagram. position, [not-push condition} 8. Indicated voitege values are the standard values for 3. S203: Start/Stop switch in " O F F " position, (not- the unit measured by DC electronic circuit tester push condition) [high impedance) with thé chassis taken as 4. S 3 0 1 : Pitch lock switch in " O N " position, (center standard. Therefore, there may exist some errors in position) the voltage values, depending on the internal im- [8] 5. S 4 0 1 : Stylus-illuminator switch in " O F F " position. pedance of the DC circuit tester.
  9. 9. SL-1200MK2 REPLACEMENT PARTS LIST (Electrical) Notas: 1. Part numbers are indicated on most mechanical parts. Please use this part number for parts orders. 2. A indicates that only parts specified by manufacturer be used for safety. 3. SL-1200MK2(M) * [ M ] , SL-1200MK2 ( M C I * [MC] Ref. No. Part No. Part Name & Description Ref. No. Part No. Part Name & Description INTEGRATED CIRCUITS R108 ERD2SFJ103 Carbon, lOkil, 1/4W, ± 5% R109, 110 A ERX1ANJ4R7 Metal Fiim, 4.7fl, 1W, ± 5% IC101 AN6675 Integrated Circuit R201 A ERG1ANJ561 Metal Oxide, 560fi, 1W, ± 5% IC201 AN6680 Integrated Circuit R202 ERD25FJ103 Carbon, lOkil, 1/4W, ± 5% IC301 AN6682 Integrated Circuit R203 ERD25FJ470 Carbon, 47ÎÎ. 1/4W, ± 5% IC302 SVITC4011BP Integrated Circuit R204 ERD2SFJ272 Carbon, 2.7kfi, 1/4W, ± 5% R205 ERD2STJ124 Carbon, 120kfi, 1/4W, ± 5% R206 ERD25TJ183 Carbon, 18kfi, 1/4W, ± 5% TRANSISTORS Carbon, 56k fi. 1/4W, R207 ERD25TJ563 ± 5% Q1 2SD389A-Q Transistor R208 ERD2STJ224 Carbon, 220k fi. 1/4W, ± 5% Q2. 3, 202 2SD637 Transistor Q201 2SCI846 -R Transistor R209 ER025TJ154 Carbon, 150kfi, 1/4W, ± 5% Q203 2SC1328-T Transistor R210 ERD25TJ183 Carbon, 18kfi, 1/4W, ± 5% R211 ERD25FJ103 Carbon, lOkil, 1/4W, ± 5% R212 ERD26FJ121 Carbon, 120fi, 1/4W, ± 5% DIODES R213 ERD25FJ122 Carbon, 1.2kfi, 1/4W, ± 5% D1 A SVDS1RBA40 Rectifier R214 ER025TJ223 Carbon, 22kfl, 1/4W, ± 5% D2.301 MA10S1 Diode, Zener 5.1V R215 ERD25FJ472 Carbon, 4.7kfi. 1/4W, ± 5% D204 MA162A Diode R216 ERD2STJ154 Carbon, 150kfi, 1/4W, ± 5% D201, 202 SVDSR-105C Light Emitting Diode R217 ERD25TJ223 Carbon, 22kfi, 1/4W, ± 5% D203~206 SVDEBR5505S Light Emitting Diode R218 ERD2SFJ102 Carbon, 1kfi, 1/4W, ± 5% D401 SVDGL-9PG2 Light Emitting Diode R219 ERD25FJ332 Carbon, 3.3kfi, 1/4W, ± 5% R220 ERD25FJ221 Carbon, 220fi, 1/4W, ± 5% CRYSTAL R221 ERD25FJ471 Carbon, 470fi, 1/4W, ± 5% R301 ERO25CKF3301 Metal Film, 3.3kfi, 1/4W, ± 1% X201 SVQU306115 Crystal, 4.19328MHz Oscillator Carbon, 1/4W, R302 ERD25FJ471 470fi, ± 5% R303 ERD25FJ822 Carbon, 8.2kfi, 1/4W, ± 5% R304 ERD25FJ162 Carbon, 1.5kfi, 1/4W, ± 5% VARIABLE RESISTORS ERD25TJ223 Carbon, 22kfi, 1/4W, R306 ± 5% VR201 EVLS6AA0OB54 Braking Adjustment (BRAKE), 50kfi (B) R601 ERD25FJ4R7 Carbon, 4.70, 1/4W, ± 5% VR301 EVMH2GA00B53 Adjustment of Pitch Control ±0%(PITCH), 5 k f i |B) VR302 EVLS6AA0OB54 Pitch.Adjustment (Gain) 50kfi CAPACITORS VR303 EVBJ05C19ABE Pitch Control Volume C1 ECEB1HS471 Electrolytic, 470jiF, 50V C2 ECEA1VS330 Electrolytic, 33^iF, 35V C3 ECEA1ES220 Electrolytic, 22/jF, 25V SWITCHES C101, 102 ECEA1VS330 Electrolytic, 33/iF, 35V S201 EVQP5R04K Switch, Speed Selector (33-1/3 r.p.m. C103 ECEA1VS330 Electrolytic, 33j/F, 35V S202 EVQP5R04K Switch, Speed Selector (45 r.p.m.) C104, 105 ECQM1H104KZ Polyester, 0.1/iF, 50 V, ±10% S203 SFDSSS5GL13C Switch, Start/Stop C106, 107 ECQM1H104KZ Polyester, 0.1/iF, 50 V, ±10% S401 SFDSD2MSL-4 Switch, Stylus-illuminator C108 ECEA1ES101 Electrolytic, 100/jF, 25V S601 A SFDSSS5G L-2 Switch, Power C109, 110 ECQM1H104KZ Polyester, 0.VF, 50 V, ±10% cm ECQM1H562KZ Polyester, 0.0056j<F 50 V, ±10% LAMP C112 ECEA1JS4R7 Electrolytic, 4.7/jF, 63V PL1 SFDN12201 Lamp, Stylus-illuminator C201 ECEA1CS330 Electrolytic, 33^F, 16V C202, 203 ECEA50Z1 Electrolytic, IfF. 50V C204 ECQM1H473KZ Polyester, 0.047^F, 50V, ±10% TRANSFORMER C205 ECEA1AS221 Electrolytic, 220//F, 10V C206 ECEA50Z1 Electrolytic, VF. 50V T1 A SLT60EU7B Power Transformer C207 ECCD1H1Û1K Ceramic, 100pF, 50 V, ±10% C208 ECCD1H390K Ceramic, 39pF, 50 V, ±10% C209 ECEA1ES101 Electrolytic, 100/iF, 16V FUSE C210 ECQM1H224KZ Polyester, 0.22/¿F, 50 V, ±10% Fl A XBA2F03NU10O Fuse, 350mA C211 ECQM1H473KZ Polyester, 0.047/iF, 50 V, ±10% C212 ECEAS0Z3R3 Electrolytic, 3.3/iF, 50V C213 ECCD1H471K Ceramic, 470pF, 50 V, ±10% RESISTORS C214 ECEA1ES101 Electrolytic, lOOjiF, 25V R1 ËRD25FJ562 Carbon, 5.6k fi, 1/4W, ± 5% C215 ECEAS0Z1 Electrolytic, VF. 50V R2 ERD25FJ682 Carbon, 6.8kfi, 1/4W, ± 5% R3 ERD2SFJ272 Carbon, 2.7kfi, 1/4W, ± 5% C216 ECEA1ES470 Electrolytic, 47^F, 25V R4 ERD2SFJ561 Carbon, 560fl. 1/4W, 5% C301,302 A ECQK1123FZ Polyester, 0.01 2/jF, 125V, ± 1% R5 ERD25FJ471 Carbon, 470Í1, 1/4W, ± 5% C303 ECEA50Z1 Electrolytic: VF, 50V R101 ERD25FJ103 Carbon, 10kfi, 1/4W, ± 5% C304 ECEA1HS100 Electrolytic, 10/iF, 50V R102 A ERX1ANJ4R7 Metal Film, 4.7U, 1W, ± 5% C305 ECQM1H122<Z Polyester; " 0.0012/iF 50V, ±10% R103 ERD25FJ472 Carbon, 4.7kfi, 1/4W, ± 5% C306 ECEA50Z1 Electrolytic, VF, 50V R104 ERD25TJ473 Carbon, 47kfi, 1/4W, ± 5% C601 [Ml A ECQF1A473MD Polyester, 0.047^F, 400V, ±20% R105 ERD26FJ103 Carbon, 10kfi, 1/4W, ± 5% C601 [MCI A ECQU1A473ME Polyester, 0.047/iF, 400V, ±20% R106 ERD25FJ150 Carbon, 15fi, 1/4W, ± 5% R107 A ERX1ANJ1R5 Metal Film, 1.5fi, 1W, ± 5% TERMINAL GUIDE OF TRANSISTOR AND IC 0 AN6675 AN6680 AN6682 SVITC4011BP 2SC1846 2SC1328 2SD637 2SD389 • m m m 123456789
  10. 10. • TROUBLE SHOOTING Power switch doesn't Power circuity check NO F1,S601,T1 (A) operate • TP5 - 20V D 1 , Q1 ~ Q 3 Reference voltage circuity check NO Q1 ~ Q 3 (B) It doesn't rotate • TP5 - 20V D2 / S t a r t / S t o p switch N YES V "push" / Control circuity check NO IC201 • Check voltage and wave X201 I form at IC201 YES Drive circuity check NO • Check voltage and wave IC101 I form at IC101 YES Check voltage on Q201 NO Q201 • Base voltage - 10V Reference voltage circuity check NO (C)l Runaway operation 1 „ Q1 ~ Q 3 J * • TP5 - 20V D2 YES Control circuity check NO • Check voltage and wave IC201 form at IC201 YES < t Drive circuity check NO • Check voltage and wave IC101 formatlC101 YES FG circuity check NO Q203, • Check voltage on Q203 FG coil Turntable rotates Control circuity check NO X201 (D) abnormally • Check voltage and wave IC201 form at IC201 YES Pitch control circuity check NO IC301 • • Check voltage and wave IC302 form at IC301, IC302 Speed changeover is Speed select circuity check NO IC201 (E) defective • TP 13 - 3.4V S 2 0 1 , S 202 •TP14-0V D 2 0 1 , D202 Strobe not Check voltage at TP28 and TP29 NO Q202 (F) • TP28 - 18.4V illuminating D203~D206 • TP29-9.6V na