Pioneer PL-51A Service Manual
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Pioneer PL-51A, PL-5IA CONTENTS 1. SPECIFTCATTONS . . 2. OPERATION..i. .. 3. PRINCIPLE OF MOTOR OPERATION. . 4. ADJUSTMENT 5. EXPLODED VNEWS AND PARTS LIST 5.1 Facking . 5.2 Mechanism. . 6. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERN AND PARTS 6.1 Schmatic Diagram . . 6.2 Power Supply Circuit Assembly (KWR-030) . . . LI ST .4 .5 .6 .7 .8 . l',| . '16 .17
1. SPE CtF|CAT|ONS PHONO MOTOR AND TURNTABLE Motor. .. Dcservomotor Speed . Two speeds: 33-1/3 rpm, 45 rpm Wow and flutter . . . . 0.05% (WRMS) or less S/N ' . . . 58dB or more (in case of using Pioneer cartridge model PC.50) Turntable platter. 3lcm diam, Aluminum-diecast alloy TONEARM Tonearm type. . . . . Static balance, S-shapq, pipe arm Effective
2. OPERATIO'U STROBOSCOPE The proper part depend upon the below. and STROBOLIGHT ffiL*ffiXA $s"113 RPhd BUT5ON Push this but,ton for playing a record " 33-1/3 rpn'r speed 45 RPh{ BUTTON Push this button for playing a cord. 45 rpm speed re- 33 113 rpm 45 rpn'l SPEED CCINT'ROL KNOBS with either of tire speed selectors pr
Pioneer PL-51A, 3. PRINCIPLE OF MOTOR OPERATION Construction of motor control for the PL-51A is depicted in Fig. 2. 1. Applying power sets the oscillator into operation. Output of this circuit passes to the pole position detecting circuit (L1-LG). 2. Here, assume that coupling between L1 and L4 is the tightest. Voltage induced in L4 is rectified and applied to Q106/Q109 in the driver. 3. Q109 in turn conducts and causes current to flow in the associated drive coil (A-1). The rotor moves in the direction shown by arrow in Fig. 1. Th
4. ADJUSTM ENT When adjustment of the fine speed control does not give a satisfactory speed, adjust the motor in accordance with the following procedure. 1. Remove the bottom cover. 2. Set the fine speed control to the midposition. 3. While observing the edge of the turntable platter with a strobe, adjust screws inside the motor as shown in Fig. 3. 4. Alt
Pioneer PL-51A, 5. EXPLODED VIEWS AND PARTS LIST 5.1 PACKING NOTICE: Any parts asterisked(*) are subject to being not supplied. Key No. Description Part No. 1 2 3 6 7 o q* 'l 0 10-1 11* 12 13 14 15 16 17 18 19 20 21 22 1a 24 25 26 2t* 2A 29* 30 31* 32 33 O- Rubber mat Rubber mat ring Card board Rubber mat bag 345x395x0.05(t)mm Vinyl bag Operati ng instructions Top packing Dust cover Dust cover bag 70Ox650x0.05(t)mm Styrotector (A ) Styrotector (B ) Unit {PL-51} Vinyl cover Furnished parts box Screwd river EP adaptor Main weight
Pioneer PL-51A, PL-5IA The following symbols stand for screwsj nuts, washers, etc. as shown in EXPLODED VIEW on pp. 9-10. N.... nut FW..... flatwasher SW..... springwasher E...... E-typewasher T.... Tappingscrew Parts List of Mechanism NOTES: Sems A: Screw and spring washer Sems B: Screw, spring washer and f lat washer Sems F: Screw and flat washer NOTICE: Any parts asterisked (*) are subject to being not supplied Key No. Description Part No. 1 2 J 4 5 t) 1 o o 10 11 12 1a 14 15 17 18 19 20 21 22 a1 24 26 27 28 29 30 JI 32 JJ 34 35 JO a1 Rubber mat ring Rubher mat Turntable platter Dust cover Ovalcountersu nk head screw M4x10 Lock p
Pioneer PL-51A, Key No. Description Part No. JO 39 40 41 42 AA 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 b-J 64 btJ 6l 68 69 7A 71 72 73 74 75 16 77 78 Under board P late Tapping screw M3 x 10 Washer 4d Pan head sems A screw M3 x 5 Main weight assembly Sub weight A Elevator arrn Elevation shaft Set screw M2.6 x 2 Washer Spri ng Washer Arm base Arm clamp Arm rest Clamp pin R est stand Set screw M2"6 x Knob Wood screw 3.1d x 16 Arm board Spri ng Arm lift plate Pan head sems A screw M3 x 5 Lifter shaft angle Cable Terminal strip (1L4P) Lift plate Pan head sems A screw M3 x 5 Leaf spri ng Pan head sems A screw M3 x 5 Push button But
Pioneer PL-51A, PL-5IA Key No. Description Part No. 79 80 ot at* 83* 84 85 86. 8l- B8 89 92 93 94 96- 97 98 99 100 101 102 103 104 105 106 101 1 08', 1 09' 110 111 1 12' 113 114 C @ a3) Pan head sems B screw M3 x 5 Pan head sems A screw M3 x 5 Leaf spring Steel ball l5l32"l Bail lever shaft Rubber washer {t=1} Tef lon washer Lever Spacer {A) Microswitch Pan head sems A screw M3 x 16 Pan head sems A screw M3 x 16 Potentiometer ( Fine speed adjustment) Function lever Cam Power cord Terminal board assembly P late P late Wood screw
Pioneer PL-51A, 6. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERN AND PARTS LIST 6.1 SCHEMATIC DIAGRAM R ch OUTRJT L ch OUTPUTCF-- Eart h 52 PO$JER S}JITCH LJl3L____i 0 POWER Dros llZ-192 SUPPLY CIRCUIT ASS'Y KWR-O3O-E POIER P.C. BOARD KNP- O5S-A TRANS FORI"lER KTT-015 SPEED SELECTOR swtTCH s r - (! )< O STROBO LAI1P 5P TERMINAL Dtor-rM srDol-01 r----' !r rr*_t L 16 25D234 HT---tr-, f,ll t( ) l ,-l F---:-alsl trll i | ,l
Pioneer PL-51A, PL.5IA 6.2 POWER SUPPLY CIRCUIT ASS'Y (KWR-O3O} Foil Side r I D,o, _,oo sIB0l-01 Q ro1 25DZ34 ! rrsr 034 I D,o, wz-192 | t- r-- ___J tr) cf) O (.) (') - () O CD t (v- O (-) J) c') (-) ct FUSE O.3A . Croz "4- 33/35 o ol o2 o Dlor - Dto+ o-{f--o Hf.-.o SIB0l-01 x 4 e-t(..+ e=fl+ o o E+;i *+i o o :4 :3 ?- StH *l- 6:'' 6 2sD234 Cro: . e#\ 100/?5 o6 o KWR-O3O-E o 5 o t7
Pioneer PL-51A, . CAPACITORS: lN pF UNLESS OTHERWTSE NOTED p: pF e RESISTORS: lN f,i,7aW UNLESS OTHERWISE NOTED k: ke. M:Mf,r Parts List of Power Supply Circuit Assembly CAPACITORS Symbol Description Part No. c1 01 c102 c1 03 Electrolytic E lectrolytic Electrolytic 330 35V 33 35V 100 25V CEA 331P 35 cEA 330P 35 CEA 101P 25 RESISTORS Symbol Description Part No. R 101 R 102 Carbon film 680 Carbon film 680 RD%PS 681J RD74PS 681J SEMICONDUCTORS Symbol O1O1 Transistor 25D234 i D101 Diode Sl801.Ol D102 Diode 51801-01 D103 Diode 51801-01 D104 Diode SIBO1-O1 Dl05 Zener diode W2.192 OTHE RS Symbol Description Part No. Fuse
Pioneer PL-51A, I'IC,NEEFI ELECTFIONIC COEIPOFIATIGIN a 1, 1-Chom--, Megu.o. M.glro ku Tokyo 153 J-p.. U,S. F'IONEEFl ELECTFIONICS COFIFC'FIATIG,N 75 Orfo.cr D.,wc Mc-,r-.h.. N,:.a J.rs-V O7a7a.tS A PIONEEFI ELECTFIONIC (ELJFIOPE' N.V. Mei.-Ce.Ler Mt: . 21, aOOO An.we.p. B.a!g!!,i FIG|NEEFI ELECTFIONIC€i AL'SiTFIALIA PTY. LTO. P56 A C iy Foad. Soutti Me bou.ne V'.t..,a 3eO5 Aust.ar'a o MABCH 1Sl5
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