Pioneer-PLL50-tt-sm 维修电路原理图.pdf

CIRCUIT DESCRIPTIONS REPAIR & ADJUSTMENTS STEREO TURNTABLE O,fPIONEER - -PL-L50 MODEL PL-L50 COM ES IN SEVEN VERSIONS DIS T INGU ISHED AS FOLLOWS: Type Voltage Remarks KU AC120V only U.S.A. model KUT AC120V only U.S.A. model without cartridge KCT AC120V only Canada model without cartridge HEM AC220V, 240V (switchable) European continent model HB AC220V, 240V (switchable) United Kingdom model s AC110V, 120V, 220V, 240V (switchable) General export model SIG AC110V, 120V, 220V, 240V (switchable) U.S. Military model This service manual is applicable to the KU, KUT, KCT, HB, HEM, Sand S/G types. As to the KUT, KCT, HEM, HB, Sand S/G types please refer to pages 47 - 48. Ce manual dinstruction se refere au mode de reglage, en franais.Este manual de servicio trata del metodo de ajuste escrito en espanol.CONTENTS ORDER NO. ARP-685-0 1. SAFETY INFORMATION . 2 10. P .C . BOARDS CONNECTION DIAGRAM . 26 2. SPECIFICATIONS . 3 3. FRONT PANEL FACILITIES . 4 4. BLOCK DIAGRAM . 5 5. CIRCUIT DESCRIPTIONS . 7 6. DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . 17 7. PARTS LOCATIONS . 20 8. EXPLODED VIEW AND PARTS LIST . 22 9. PACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 11. SCHEMATIC DIAGRAM . 29 12. ELECTRICAL PARTS LIST. . . . . . . . . . . . . . . 32 1 ADJUSTMENTS . 34 RGLAGE . 36 AJUSTE . 38 14. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 40 15. SUPPLEMENT FOR KUT, KCT, HEM, HB,S AND S/G TYPES . . . . . . . . . . . . . . . . . . . . . 47 PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153, .Japan PIONEER ELECTRONICS (USA INC. P.O. Box 1760, Long Beach, California 90801 U.S.A. TEL: (BOOJ 421-1404, BOOJ 237-0424 PIONEER ELECTRONIC (EUROPE N.V. Keetberglaan 1. 2740 Beveren, Belgium TEL: 03/7752808 PIONEER ELECTRONICS AUSTRALIA PTV. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia TEL: (03) 580-9911 FZ NOV. 1984 Printed in Japan RadioFans.CN 收音机爱 好者资料库PL-LSO 1. SAFETY INFORMATION1. SAFETY PRECAUTIONSThe following check should be performed for thecontinued protection of the customer and service technician. LEAKAGE CURRENT CHECK Measure leakage current to a known earth ground (water pipe, conduit, etc.) by connecting a leakage current tester such as Simpson Model 22-2 or equivalent between the earth ground and all exposed metal parts of the appliance (input/output terminals, screwheads, metal overlays, control shaft, etc.). Plug the AC line cord of the appliance directly into a 120V AC 60Hz outlet and turn the AC power switch on. Any current measured must not exceed 0.5mA. 2 Device under test Test all exposed metal surfaces G) 2-wire cord Also test with plug reversed (Using AC adapter plug as required) Leakage current tester Reading should not be above 0.5mA Earth ground AC Leakage Test ANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER. 2. PRODUCT SAFETY NOTICEMany electrical and mechanical parts in the appliance have special safety related characteristics. These are often not evident from visual inspection nor the protection afforded by them necessarily can be obtained by using replacement components rated for voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this Service Manual. Electrical components having such features are identified by marking with a 6 on the schematics and on the parts list in this Service Manual. The use of a substitute replacement component which dose not have the same safety characteristics as the PIONEER recommended replacement one, shown in the parts list in this Service Manual, may create shock, fire, or other hazards. Product Safety is continuously under review and new instructions are issued from time to time. For the latest information, always consult the current PIONEER Service Manual. A subscription to, or additional copies of, PIONEER Service Manual may be obtained at a nominal charge from PIONEER. RadioFans.CN 收音机爱 好者资料库2. SPECIFICATIONSMotor and Turntable Drive System . Direct-drive Motor . DC servo motor Turntable Platter . 304 mm diam. aluminum alloy die-cast Speeds . 33-1 /3 and 45 rpm Wow and Flutter . Less than *0.014% (WRMS) 0.025% (WRMS) 0.035% WTD Peak (DIN) Values marked with an * designate the wow and flutter for motor, and do not include the cartridge or tonearm load. Signal-to-Noise-Ratio . More than 78 dB (DIN-Bl (with Pioneer cartridge model PC-300T) Tonearm Type . Integrated straight tom ea rm PC-300T Specifications Type . IM type Stylus . 0.3 x 0.7 mil diamond (PN-300T) Output Voltage . 2.5 mV (1 kHz, 5 cm/s LAT. Peak) Tracking Force . 1.0 g to 1.5 g (proper 1.25 g) Frequency Response . 10 to 33,000 Hz Recommended Load . 50 kQ Weight . 5.9 g Su bf unctions Auto lead-in, auto return, auto cut, repeat Arm elevation, manual play, Auto disc size selector, record detection, Auto speed selector INFORMATION TO USER FOR U.S.A. MODEL Miscellaneous Power Requirements HEM, HB, HP models . AC 220 V /240 V-(switchable), 50, 60 Hz KUT, KCT, KU, KC models . AC 120 V, 60 Hz S, SIG models . AC 110 V/120 V/220 V/240 V-(switchable), 50, 60 Hz Power Consumption HEM, HB, HP models . 13W KUT, KCT, KU, KC models . 12 W S,S/Gmodels . 9W Dimensions . 420 (W) x 108 ( H) x 365 ( D) mm 16-1/2 (W) x4-1/4 (H) x 14-3/8 (D) in.Weight . 4.8 kg/11 lb Accessories EP Adapter . 1 Operating Instructions . 1 NOTE: Specifications and design subject to possible modification without notice, due to improvements. This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufactures instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may find the following booklet prepared by the Federal Communications Comission helpful: reorient the receiving antenna relocate this component with respect to the receiver move this component away from the receiver plug this component into. a different outlet so that component and receiver are on different branch circuits. How to Identify and Resolve Ratio-TV Interference Problems. This booklet is available from the US Government Printing Office, Washington, D.C., 20402, Stock No. 004-000-00345-4. The above instructions apply only to units which will be operated in the United States. 3 3. FRONT PANEL FACILITIES- CD POWER switch Press this switch to turn the power on and off. ON) (depressed position) : Power is switched ON. STAND-BY (released position): Power is switched OFF. REPEAT switch/indicator Press this switch so that the indicator lights for repeat play. LOCATE switches Use these switches to start manual playback, or during playback to change the track being played. When the switches are pressed, the tonearm will move to the right or left. .,. .,.): Tonearm moves to left. .,.,. I: Tonearm moves to right. ARM ELEVATION switch(UP)/ indicator Use the switch for manual play.Use the switch to suspend record play temporarily.Use the switch when changing the tracks during manualplay. PL-LSO UPI indicator lights: The tonearm rises ( the stylus moves away from the record). UPI indicator goes out: The tonearm descends (the stylus is lowered onto the record). START/STOP switch Depress this switch when starting auto play or when stopping play. SPEED switch Set this switch in accordance with the speed of the record which is to be played. AUTO: Automatically sets rotation speed in accordance with the size of the record: Rotates at 33-1 /3 rpm with 30 cm records. Rotates at 45 rpm with 17 cm records. (331: Rotates at 33-1 /3 rpm (451: Rotates at 45 rpm (J) Platter Rubber mat Platter shaft Tonearm CARTRIDGE (PC-300T) NOTE: A cartridge is not provided with the KUT and KCT mode/1 and so your own cartridge should be mounmd, following th instructions laid down in CARTRIDGE MOUNTING. l EP adapter This is used when playing records with a large center hole. Cabinet Dust cover 4 PL-L50 4. BLOCK DIAGRAMPHONO MOTOR CIRCUIT A DRIVING AMP B HALL- AMP c V-1 CONVERTER D .DRIVING AMP E RESET CIRCUIT F SAMPLE ,S HOLD CIRCUIT G VOLTAGE REGULATOR H BUFFER AMP FG AMP TIMING Cl RCUIT K PHASE COMPARATOR L LOCK INDICATOR M l/2 VCC2 CIRCUIT POWER SUPPLY CIRCUIT 5 + B1 (12Vl +B2(5Vl 05 + C4 RESET Cl +B1tt Rl2 C7 + -QI PD6033 3 RESET S I -0 21 S/S S 2-0 I S3 -0 EV S4 -0 ARM l EV I EV 2 1 (2/2) 03 M54547P e 6 ADDRESS 17 SIZE 30 SIZE REP LED UP LED 26 25 24 ARM DRIVING MOTOR 0201 ARM RESET SWITCH ADDRESS SENSOR CIRCUIT SIZE DETECTOR CIRCUIT 09 LED DRIVER 06 (REP) + 82 D71UP) COVER 0/C DETECTOR SWITCH + 81 TRACKING SENSOR CIRCUIT 5v-.-w. r- - -,0201: : I I I I I I L_ _.J VR201 TRACKING SENSOR GAIN ADJ 5. CIRCUIT DESCRIPTIONS5.1 CIRCUIT DESCRIPTIONS 5.1.1 Address Sensor Circuit The address sensor is located on the mechanism base unit. It detects the position of the tonearm and sends address pulses to the control IC as the tonearm moves. The address sensor is made up of an internal schmitt trigger circuit photo interrupter and a slit wheel which is synchronized with the carriage. The slit wheel spins when the carriage moves and intermittently cuts off I ight to the photo interrupter (0301) in pulses which correspond to the carriage movement. These pulses are counted by the control IC, which detects the distance the carriage moves, the tonearm lowering position and the end of the record. It also registers band addresses. The address pulses from the photo interrupter work as follows: When the light is cut off, the output is L, and when the .:ight is not cut off the output is H. One address signal pulse is approximately equivalent to 0.114 mm of tonearm movement. QI PD6033 Voltage regulator +sv- Tonearm motor drive output (toward outside edge) 5 01 0 ARM l Tonearm motor drive output (toward center) 6 02 0 EV 1 Tonearm EV drive output (drawing plunger in) ON I OFF Drawing time 1 sec 7 03 0 EV 2 Tonearm EV drive output (holding plunger in) ON I OFF 8 04 0 TRACKING Tonearm tracking output during tracing ON I OFF 9 05 0 33/45 Phono motor 33/45 switch output - 10 06 0 PH ONO-MOTOR Phono motor START/STOP output Start i Stop 11 Q7 12 RO I 0/C Cover 0/C detection input Open i Closed 13 Rl 14 Vss -GND 15 R2 I 45rpm 33/45 switch 45 input Closed i AUTO 16 R3 I 33rpm 33/45 switch 33 input Tonearm START/STOP switch inut I AUTO 17 R4 I REP Repeat switch input ON I OFF 18 R5 I Locate switch input (Toward outside edge) ON I OFF 21 R8 I SIS Tonearm START/STOP switch input ON I OFF 22 R9 0 UP LED Tonearm UP display LED output UP I DOWN 23 R10 0 REP LED Repeat display LED output ON I OFF 24 KO I 30 SIZE 30 cm record detector input 25 Kl I 17 SIZE 17 cm record detector input 26 K2 I ADDRESS Address sensor input -11.Iu 27 K3 I REST Rest switch input On rest I Off rest 28 Vee -+5V 12 17cm EP Fully automatic playing 13 Power on I , Cover open Initial reset o Tone a rm at rest Place 17cm record on turntable. 1 o Phono motor stationary 0 ov r lo C e c se d o Speed switch set to AUTO position. Cover closed START/STOP Fully automatic ON playing starts. Turntable (33rpm) . -0- -UP LED ON-, I 01 logic in initial reset complete status I -8 2-9 3 H 10 4 H 11 5 H 12 6 H 13 7 H 14 H 15 H 16 H 17 H 18 -19 H 20 L(GND) 21H When on AUTO or 33 rpm 22H When on AUTO or 45 rpm 23 H When the switch is not pressed: 24 H -25H -,-26 H -,-27 H _,_28 Automatic return L H -L 5V Detects Detects end of record end of record Tonearm up Tur EV solenoid OFF 0 I L-1 -I/ - - - - - - - - - - - - - - - - - - - - - - - - -0-. I I I I I I u? I .,.,. Playing selection I ? .,.- ./ ects no m record. Lead-in ects 17cm ird. v 3Tonearm moves toward record center. Tonearm returns J, Turntable stops turning. Tonearm moves toward outside edge of records. _,_,., I 14 IIIIRest For model number PL-L50 Player operation Sensor Detection Tonearm position during operation Unit operations Tonearm DOWN Tracing j Iii I I I I I 17cm lowering Tonearm stops, Tonearm I position address EV solenoid tracking I drawn in ON I L-. I Detects rest I +tTonearm stops + -UP LED OFF II I I 1-. I I ? Dow 1 I ? ft/ I ? I I ._? I I ._ I ?L-,II I I I I I I I , Timing chart 17cm EP fully automatic operation 1 cycle -C,- Speed switch set to AUTO -c:;:i I -QJ -_j_ -Ro,dsi 4E-detection Lead-in -Turntable Lead-in Arrival at 17cm Tonea, rpms begins lowering position down ( 17cm ) detection ARM I4 ARM 5 l C-.i Rest Arrival at rest 1 Approximately DOWN I Approximately i sec 1 0.5 sec Approximately 0.3 sec 0.5 sec I I I tracking ON I 33rpm set Turntable stops turning - -l lf mnnr lflJ -EV ON I ., . -D- -., I IlfLf :llil ? -1 t EV Cover open Cover close ON Record removed from turntable I ., - - - - - - - - - -.-0-_, I d 16 6. DISASSEMBLYDust cover assembly Rubber mat assembly Motor assembly Under base Fig. 6-1 17 6.1 UNIT DISASSEMBLY 1. Open the dust cover and remove the rubber sheet andturntable.2. Close the dust cover and gently turn the unit over.Place the unit on something soft that wont scratch the dust cover. 3. Removing screw O releases the under base.4. Removing screw f) releases the motor assembly.5. Removing screw releases the control board unit.6. Removing screw 8 releases the SW board unit, and removing screw0releases the PU board unit. 7. To remove the dust cover, open it up and remove the plastic rivets labeled 0 . (The plastic rivets can be removed easily by pushing the pins from the inside of the dust cover.) 8. Removing screwfjwill release the mechanism base unit. Mechanism base board assembly 6.2 CARRIAGE REMOVAL 1. Remove the fixer from the carriage and the wire from the pulley. (See Figure 6.2) 2. Remove screw fl)and pull the guide bar away from the carriage in the direction indicated by the arrow. The carriage and tonearm assembly can now be removed. 3. Removing the spring will release the carriage board assembly, and removing screw 0 will release the mechanism base board assembly.Wire Fixer Pulley Fig. 6-2 Removing Carriage Wire Carriage board assembly Fig. 6-3 Carriage Removal 18 6.3 REPLACING THE CARRIAGE WIRE After assembling the carriage and tonearm assemblies in the opposite order of the previous section, replace the carriage wire according to the following steps.1. Adjust the length of the wire unit as shown in figure 6-42. Attach the wire unit grommet