Pioneer pl 55 x service manual

Page 2

CONTENTS

SPECIFICATIONS ........................................................ 2
PARTS AND THEIR FUNCTIONS .......................................... 3
OPERATION OF MOTOR AND MECHANISM
3.1 Motor ............................................................ 5
3.2 Prior to Start of Playing .............................................. 6
3.3 Return Operation ................................................... 7
3.4 Stopping Under Manual .............................................. 8
ADJUSTMENT
4.1 Tonearm Will Not Return to The Arm Rest ............................... 9
4.2 Tonearm Returns to The Arm Rest Before The Record Finishes ............... 9
4.3 Tonearm Return Speed Is Incorrect ..................................... 9
4.4 Tonearm Stops before It Reaches The Arm Rest ........................... 9
4.5 Tonearm Hits The Inside of The Arm Rest ................................ 9
4.6 Tonearm Bounds in The Arm Rest ...................................... 10
4.7 Arm Elevator Will Not Move at A Correct Speed ........................... 10
4.8 Turntable Will Not Turn or Stop ....................................... 10
4.9 Adjustment of The Shorting Switch Contacts ............................. 10
4.10 Adjustment Procedure .............................................. 10
4.1 1 Adjustment of Motor Speed ........ V .............. . ..................... 11
SCHEMATIC DIAGRAMS AND P.C. BOARD PATTERN
5.1 Schematic Diagrams ................................................. 12
5.2 Power Supply Circuit Assembly . . . . . . . . . . . . . . .. ........................ 13
EXPLODED VIEW
6.1 Contents .......................................................... 15
6.2 Main Panel ........................................................ 17
6.3 Auto Return Assembly .............................................. 18
6.4 Speed Selector ..................................................... 19
6.5 Tone Arm ........................................................ 20
6.6 Circuit Board ...................................................... 21
' 6.7 Anti-Skating ......... ; ................... - .......................... 22
6.8 PU-Plate ........................................................ 22
6.9 Power Supply Circuit ............................................... 23
6.10 StartLever................. ...................................... 23
6.11 Upper Board ..................................................... 24
6.12: Under Board ....................................................... 25
6.13 Packing .......................................................... 26
6.14 Accessory Case ..................................................... 27