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CIRCUIT DESCRIPTIONS 

REPAIR & ADJUSTMENTS 

STEREO  TURNTABLE 

O,f}PIONEER' 

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PL-L50 

MODEL PL-L50 COM ES IN SEVEN  VERSIONS DIST 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 

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 d'instruction se refere au  mode de reglage, en fran�ais.

• 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 

R�GLAGE  ..........................  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:  03/775·28·08 

PIONEER  ELECTRONICS  AUSTRALIA  PTV.  LTD.  178-184  Boundary  Road,  Braeside,  Victoria  3195,  Australia 

TEL:  (03)  580-9911 

FZ  ©  NOV.  1984  Printed in Japan 

Summary of Contents for PL-L50

Page 1: ... 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...

Page 2: ...ARD AND MUST BE COR RECTED BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER 2 PRODUCT SAFETY NOTICE Many 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 hav...

Page 3: ...to improvements This equipment generates and uses radio frequency energy and if not installed and used properly that is in strict accordance with the manufacture s instructions may cause interference to radio and television recep tion 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...

Page 4: ...lay 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 stop ping 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 accordanc...

Page 5: ...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 B 1 12Vl B2 5Vl 05 C4 RESET Cl B 1 tt Rl2 C7 ...

Page 6: ... I 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 ...

Page 7: ...pulse is approximately equivalent to 0 114 mm of tonearm movement QI PD6033 Voltage regulator sv 1 w r r A I ADDRE ___ l ___ _j Photo interrupterj Slit wheel Fig 5 1 Address Sensor Circuit 5 1 2 Tracking Sensor Circuit This circuit detects tracking errors by means of a shutter which is synchronized with the tonearm and a photo in terrupter The tracking sensor is made up of a shutter synchro nized ...

Page 8: ...rm elevation down until the hold signal ends 12V Tonearm drive The tonearm drive is controlled by input to 03 pin 4 pin 5 and pin 15 Their truth values are shown in Fig 5 4 Lead in locate in 03 receives locate in signals from the control IC 01 and with an output of approximately OV from 03 pin 14 01 and approximately 11V from pin 11 02 the tone arm motor begins turning in the lead in direction Lea...

Page 9: ...81 turns off and 080 remains off Due to this H is input into 01 pin 25 When the 30 cm record size slits are not covered it s the same as no record and 082 and 09 go ON and OFF according to the revolutions of the turn table The waveforms show in figure are then input into 01 pin 24 01 then determines that there is a 17 cm record because of this When there is a 30 cm Record Since the 17 and 30 cm re...

Page 10: ... the rotor attract and repel each other causing the motor to start turning When the motor starts turning the signal approximately 0 5mV p p produced by a frequency generator FG in the mtor rotation unit is amplified to about 0 3V p p by an FG amplifier 05 06 and is input into the FG ampli fier input pin 17 inside PA2017 Possible frequencies at this point are 55 55 Hz for 33 rpm and 75 Hz for 45 rp...

Page 11: ...in 15 vcc 11 13 I J l w 0 331 3 H OPEN 45 L 0 T OPENJ Fig 5 9 Phono Motor Circuit Approximately 0 3V p p A C _ A Pin 6 3 6V l 7V ov 3 7V Pin 8 2 3 V Pin 10 3 6V 7 1 V ov Fig 5 10 Phono Motor Circuit Waveforms 11 ...

Page 12: ...OR 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 in ut I AUTO 17 R4 I REP Repeat switch input ON I OFF 18 R5 I l Locate switch input toward record center ON I OFF 19 R6 I EV Tonearm elevation switch input ON I OFF 20...

Page 13: ...atic 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 21 H When on AUTO or 33 rpm 22 H When on AUTO or 45 rpm 23 H When the switch is not pressed 24 H 25 H 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 ...

Page 14: ...4 I I I I Rest For model number PL L50 Player operation Sensor Detection Tonearm position during operation Unit operations Tonearm DOWN Tracing j I ii 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 t Tonearm stops UP LED OFF I I I I 1 I I _ Dow 1 I _ ft I I I _ I I _ I f f _f J J L I I I I I I I I I ...

Page 15: ... at 17cm Tonea rpms begins lowering position down 17cm detection ARM I 4 ARM 5 l l EV1 Drawing plunger in 6 EV2 EV Holding plunger in 7 DOWN Approxim I tracking O TRACKING 8 33 45 I 45rpm set PHONO MOTOR Turntable turns o c _ 30 SIZE lf1J1f1Jl1lf 17 SIZE 25 ADDRESS 26 UJUUlJUlJUlJ L REST 27 t f cb Cover Cover ER ON open closed Record placed on N 15 ...

Page 16: ...n 3tely 1 sec Approximately 1 sec I EV i i 1 Tonearm UP complete Tonearm returns C 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 lfmnnrlflJ EV ON I D I IlfLf llil UlJUUUUUUl 1 t EV Cover open Cover close ON Record removed from turntable I 0 _ I d 16 ...

Page 17: ...6 DISASSEMBLY Dust cover assembly Rubber mat assembly Motor assembly Under base Fig 6 1 17 ...

Page 18: ...tic rivets labeled 0 The plastic rivets can be re moved 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 th...

Page 19: ... wire and the worm wheel connect the wire to the wire guard and attach the worm wheel to the mechanism base 4 As shown in figure 6 4 put the wire around the pulley and push the fixer into the carriage until it locks with a click Take care not to let the wire overlap Wire unit Grommet F t j i 380mm 1 OOmml Wire guide Fig 6 4 Wire Replacement 6 4 LEAD LINE DISPOSAL 1 Slide carriage to the left as fa...

Page 20: ...erefore when replacing be sure to use parts of identical designation For your Parts Stock Control the fast moving items are indicated with the marks and GENERALLYMOVES FASTER THAN This classification shall be adjusted by each distributor because it depends on model number temperature humidity etc Rubber mat assembly PEA 074 Turntable platter PNR 200 Hinge assembly PXB 395 Cover PNY 186 PU cord PDX...

Page 21: ...tch 0 C SW PSG 053 ill IC 05 NJM78M05A 1c 04l NJM1s12A Control board unit XWM 174 Slide switch PSH 007 Solenoid assembly PXB 392 Tonearm assembly PPD 678 Carriage board assembly PWX 084 Slideknob PAC 215 Functionknob A PAC 202 Power transformer assembly PTX 050 Ph Tr board unit Motor PXM 135 SW board unit XWS 032 Power switch PSA 008 21 ...

Page 22: ...bber Power knob A 44 PBA 173 Screw Function knob A 45 PBA 170 Screw Slide knob 46 PXB 394 Dust cover assembly Switch cap 47 PBM 012 Plastic rivet Cover 48 PXB 395 Hinge assembly Switch lever 49 PEB 269 Insulator A Turntable platter 50 PEB 270 Insulator B Rubber mat assembly 51 PBA 138 Screw Motor 52 N93 603 EP adaptor Rotor unit 53 WA2100400025 Washer Circuit boart unit 54 PNY 273 Carriage Screw 5...

Page 23: ..._J 1 2 I 3 47 A B 11 C j 3f y 68 15 14 I 60 D 15 L_ I 2 I_ 3 ...

Page 24: ...4 I 5 I 6 L A 37 B 66 40 7 c 61 D I I 5 6 4 ...

Page 25: ...king Mark No Part No Description 1 PRB 275 Operating instructions 2 PHH 188 Packing case 3 PHA 178 Protector L 4 PHA 179 Protector R 5 PNY 198 Packing 6 PBA 178 Screw 7 PNY 194 Carriage clamper 8 PEA 074 Rubber mat assembly 101 Sheet 102 Sheet D ...

Page 26: ...CTION DIAGRAM A B c D i 26 SOLENOID ASSEMBLY PXB 392 Ph Tr BOARD UNIT CARRIAGE BOARD ASSEMBLY PWX 084 PU BOARD UNIT PU CORD ASSEMBLY PDX 016 1 I 2 81 82 PH101 I 3 LEAD IN STATUS LEAD OUT STATUS l c o QI Q2 Q 3 Q6 Q8 9 DO 06 07 3 ...

Page 27: ...I ILH ffMCSH LH HVCIH Q9 4 QS Q3 I 5 I 6 MECHANISM BASE BOARD ASSEMBLY PWX 083 0 NO NC ON OFF 59 ARM REST SWITCH PSH 007 REST POSITION ON NO REST POSITION OFF QI Q2 Tr BOARD B UNIT Q7 Q6 CONTROL BOARD UNIT XWM 174 I 4 I 5 I 6 ...

Page 28: ... A UNIT rEIJ OFF 0 NC NO ON SB OPEN CLOSE SWITCH PSG 053 COVER CLOSE ON COVER OPEN OFF 7 57 POWER POWER TRANSFOMER ASSEMBLY PTX 050 1 RED WHT __ R_E_D r1 CJ 6 _0Hz L _____J I_ SW BOARD UNIT XWS 032 POWER CORD ASSEMBLY PDE 221 8 I 9 L A B c D 9 ...

Page 29: ...I Jr I LEAD O UT L H L I _J STOP H H 7 3 2 I L L n PLA Y STATUS H L L VH 2 _ OP A MP ____ L G R RG R G L LG DARLINGl ON TRAHSIS TOR x I 7 AJIAJ OG P t D 3 Q 3 MOTOR S ELEVATION DRIVER I I I F R DRIVER I I MOTOR I I I I PU LEAD Vcc2 VNI R7 3 311 I I LINE 9 JC II 12 13 15 JI I POA 0 26 I I A14 3 3k I I I I 2Wl I I 10 l 15 I I I I I x 3 I R G R G L LG T SW MO l PU BOARD UNIT I I LEAD IN L L H I LEAD ...

Page 30: ... factor of I be sure to use parts of identical de marked capacitors and resist This is the basic schematic diagrc due to improvements in design SWITCHES ICONTROL BOARD UNIT I S 1 START I STOP 52 LOCATE 53 ARM ELEVATION 4 LOC ATE 55 REPEAT 56 SPEED I SW BOARD UNIT I 57 POWER I OTHER I S 8 OPEN I CLOSE 59 AR M REST 3 The underlined 20 C MOTOR BOARD UNIT PXM 146 l t11 MU TE EV 19 53 i o_ 0 EV J 18 1 ...

Page 31: ... 3 AUT0 45 ON OFF 0 Q _ OFF indicates the switch position ONTROL 7 Rl3 33 c 2 0 1 TPI I I Qt PA2017 I Q2 5 2SA933LN Q6 2SC1740LN HA HB RCX 010 LA 1 LA2 LB l LBZ VRI VR 2 PTL 017 PCP 086 PCP 084 Q5 6 BUFFER R23 22k tOOk C24 10 16 __J I 8 I 9 External Appearance of Transistors and ICs 2SA933LN 2SC1740LN Suffix hFE Lot No fTypeNo c 8 TypeNo hFE 2SA933S 2SC1740S E C BA6251 M54547P NJM7812A NJM78M05A T...

Page 32: ...n ______ PartNo 6 Control board unit Tr board A unit Tr board Bl unit SW board unit PU board unit Ph Tr board unit Carriage board assembly XWM 174 XWS 032 PWX 084 Mechanims base board assembly PWX 083 6 Power transformer assembly 6 Power cord assembly Motor assembly Circuit board unit Control Board Unit XWM 174 SEMICONDUCTORS PTX 050 PDF 221 PXM 146 PWM 179 Mark _S ym_ b_o _l _D_es_cr ip t_io_n___...

Page 33: ... 1A01 CKDYF 1032 50 RD1 6PMDDDJ Motor Assembly PXM 146 Mark Symbol Description Part No Rotor unit PXV 104 Circuit board unit PWM 179 The motor assembly comprizes the Rotor Unit and the Circui Board Unit PWM 179 Circuit Board Unit PWM 179 SEMICONDUCTORS Mark Symbol Description 01 02 CAPACITORS Mark Symbol Description C4 C12 C2 C8 C9 C13 C17 C6 C7 C1 C3 C11 C5 C10 RESISTORS Part No PA2017 2SA933 Par...

Page 34: ...rn the adjustment screw O clock wise When using the test record the position will be set for 30cm records Test record Adjustment position PLS2001 310 3 counts PLS4001 13 6 counts 0 Fig 13 1 Tone Arm Adjustment 34 13 2 TRACKING SENSOR GAIN AND OFFSET ADJUSTMENT Gain Adjustment 1 Remove the dust cover and panel cover 2 Connect a DC voltmeter to CN5 pin 4 GND and pin 5 TRKG 3 Turn screwfjcounterclock...

Page 35: ... 3 Turn screw O until the tip of the needle is 5 to 7 mm above the surface of the record Turning the screw clockwise lowers the needle Turning the screw counterclockwise raises the needle Locate switch C bmm spacer Fig 13 3 Tone arm height adjustment 13 4 Phono Motor Speed Adjustment 1 Place the strobe sheet on the platter Turn on the power switch and the locate switch II II to turn the phono moto...

Page 36: ... une montre Lorsque l on utilise le disque d essai la position sera reglee pour les disques de 30 cm Disque d essai Position de reglage PLS2001 310 3 comptes PLS4001 13 6 comptes Fig 13 1 Reglage du bras de pick up 36 13 2 REGLAGE DU GAIN DU SENSEUR D ALIGNEMENT ET DU DECENTRAGE Reglage du Gain 1 Deposer le couvercle anti poussiere et le couvercle du panneau 2 Connecter un voltmetre CC a la broche...

Page 37: ...7 mm au dessus de la surface du disque En tournant la vis dans le sens des aiguilles d une montre abaisser l aiguille En tournant la vis dans le sens contraire des aiguilles d une montre soulever l aiguille Cu d ecartement de 6mm Fig 13 3 Reglage de la hauteur du bras de pick up 13 4 REGLAGE DE LA VITESSE DU MOTEUR DU LECTEUR DE DISQUE 1 Placer la feuille stroboscopique sur le plateau Mettre en se...

Page 38: ... este usando el disco de prueba la posici6n quedara fijada para discos de 30 cm Disco de prueba Posicion de ajuste PLS2001 310 3 cuentas PLS4001 13 6 cuentas Fig 13 1 Ajuste del brazo fonocaptor 38 13 2 AJUSTE DE GANANCIA DEL SENSOR DE SEGUIMIENTO Y DE DESCENTRADO Ajuste de Ganancia 1 Sacar la cubierta para el polvo y la cubierta del panel 2 Conectar un voltimetro de C C al pasador No 4 GND y al p...

Page 39: ...aguja este de 5 a 7 mm sabre la superficie del disco Girando el tornillo en el sentido de los punteros del reloj se baja la aguja Girando el tornillo en el sentido contrario a los punte ros del reloj se sube la aguja localizaci6n C Chavetas de 6mm Fig 13 3 Ajuste de la altura del braze de fonocaptor 13 4 AJUSTE DELA VELOCIDAD DEL MOTOR DEL TOCADISCOS 1 Colocar la hoja de estroboscopia sabre el pla...

Page 40: ...W ON NO Tonearm lowers in the 30cm area Check the size sensor Does the phone motor turn YES Does the tone arm leave the rest YES Does the tonearm go to the 17cm area YES Does the EV DOWN function YES Does the tonearm track YES Does the phone motor switch to 45 YES Is there sound YES Does auto return work YES End NO NO The switches fail to work NO See 14 3 The phone motor doesn t 1 turn START STOP ...

Page 41: ...k on the microcom puter See 14 6 The tonearm doesn t move Are both pins 11 and 14 NO of03 approximalety 11V YES Perform mismounting and soldering checks on the area from03 pins 4 and 5 to CN3 JP301 JP302 and the drive motor Perform wiring and sol dering checks from the drive motor PXM 137 to JP302 301 and CN3 14 3 THE PHONO MOTOR DOESN T TURN START STOP The phono motor doesn t START Using the loca...

Page 42: ...a of R13 15 16 17 and 03 pins 1 2 and 3 The switches fail to work NO With the power off check whether the switches short out when pushed YES NO Does the Microcomputer port of the pressed switch become L NO YES Perfrom an LED check Symptom There is sound while playing but the stylus bounces because the tonearm fails to track at that time the tonearm is at an ex treme angle Perform a pattern check f...

Page 43: ...mately 11V being applied to the both terminals of the drive motor NO With CN3 removed is the voltage YES between CN3 male pins and 2 approximately 11V NO Does the tonearm only move toward the center of the record Check connections and soldering up to JP301 the mechanism base board and the JP302 motor Is 01 pin 27 H NO i 1 YES YES Are both 01 pins 4 and 5 H NO YES Are they both L NO NO Is one of th...

Page 44: ...atterns and soldering from 01 pins 6 and 7 to 02 pins 7 and 6 Check the patterns and soldering from 02 pins 10 and 11 to 03 pins 7 and 8 Is CN2 OK properly connected Perform error and pattern checks from 03 pins 9 and 10 to R22 and CN3 pin 3 OK At that time do both terminals of the EV Perform error connecti on patterns and sol solenoid draw the following voltages dering checks from CN2 female to J...

Page 45: ... tonearm doesn t move Move the tonearm with the locate i switch using an oscilloscope Do the fol lowing pulse waveforms appear at With CN3 female removed and 5 JP301 pin 3 NO applied to pin 5 and an external GND applied to pin 6 do the waveforms sv JlIUlnIU at left appear when the worm gear s OV moved manually YES YES I Do they appear at 01 pin 26 also NO Check the pattern from CN3 male pin 3 to 0...

Page 46: ...08 and 9 Also check the patterns from the 08 and 9 col lectors to O1 pins 24 and 25 14 11 SPEED SELECTOR FAILURE 46 The 33 45 selector doesn t work Is the speed switch 01 pin 16 L at NG 33rpm and 01 pin 15 L at 45rpm YES When the 33 45 switch is changed N O does 01 pin 9 change from H to L YES At that time does 02 pin 14 change from H to L YES Does the speed selector move freely Does it get stuck ...

Page 47: ...II J 0 5n ORS RN2H Q llll Q K 1n 01O RSlP QJ Q K Ex 2 When there are 3 effective digits such as in high precision metal film resistors 5 62kn 562 x 10 5621 RN SR ID ll F The mark found on some component parts indicates the importance of the safety factor of the part Therefore when replacing be sure to use parts of identical designation For your Parts Stock Control the fast mouing items are indicat...

Page 48: ...nd S G types LINE VOLTAGE SELECTOR t PSB 014 ill POWER TRANSFORM ER ASSEMBLY PTX 058 ill SW BOARD UNIT XWS 032 SW BOARD UNIT XWS 032 V LT r2 0 1RED CN1l S7 BLU 1 220V Ir POWER S PS A o oa vn I BRN I 120V I I STAN DBY SW I I Cl WHT 1 0 AC 11 OV 120V 220V 240V POWER CORD ASSEMBLY 2 1 D 0 047 I cb W 50 60 Hz P DF 2 2 0 2 I J P3 48 ...

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