Technics SL-PD647

Service Manual
multi-stage noise SH i
anise [DIGITAL M ASH
WISI
DIGITAL AUDIO
NEW MECHANISM SERIES
(RAE0301: Type A/RAE0302: Type B)
SPECIFICATIONS
@ Audio
No. of channels
Frequency response
2 (left and right, stereo)
2—20,000Hz, +1dB
Output voltage ; 2V (at OdB)
Dynamic range ‘ 92dB
SIN 100dB
0.007 % (1 kHz, OdB)
Below measurable limit
MASH (1 bit)
Approx. 1kQ
More than 10kQ
Total harmonic distortion
Wow and flutter
DA converter
Output impedance
Load impedance
Mi CONTENTS
Page
PRECAUTION OF LASER DIODE ........cscsssssssssssssessnssensensnssanssaerene 2
ACCESSORIES wi siisicecincssiucsvscessdesinistesesces tes! ccesecosenicossedtoenssesecnestoece 3
CONNECTIONS w.. scseseereccssasessasasesaessesssesasstsecasasicivansannesucanansavagesossesie 3
FRONT PANEL CONTROLS AND FUNCTIONG..........:0c0cs0s00 4,5
BEFORE MOVING uu.........ssesssscsscssssesecncesecsarcnnensesoeenssneeseessessenneennenes 6
HANDLING PRECAUTIONS FOR OPTICAL PICKUP .............000 7
INSTRUCTIONS FOR TRAVERSE OIL ..........sessssssssssssstsnsesereneesors 7
DISASSEMBLY INSTRUCTIONS ..........c0sccssciestsssessssssecersencnse 8~15
HOW TO CHECK THE MAIN AND SERVO P.C.B. .............. 16, 17
OPERATING THE UNIT WITHOUT THE FRONT PANEL
ASS’Y (OPERATING P.C.B. AND KEYS) .........:scsccssesssesseae 18
DISPLAY FUNCTION OF AUTOMATICALLY-ADJUSTED
RESULTS (SELF-CHECK FUNCTION).........cccssescseeees 19, 20
NEW DIGITAL SERVO CIRCUIT.......c:cssccsecssssscsssssecssssssesereneeres 20
Technics
ORDER NO. AD9304104C8
Compact Disc Changer
SL-PD647
Colour
(K)... Black Type:
Area
Suffix for
© [ewe «|
Asia, Latin America,
Middle Near East
and Africa.
¢ Technics (or Panasonic) developed the world’s first MASH
type DAC and ADC.. MASH technology was invented by
(K)
NTT (LSI Labs).
© MASH is a trademark of NTT.
@ Pickup
Wavelength 780nm
i General
Power consumption 15W .
Power supply
For (E, GN) areas.: AC 50/60Hz, 230—240V
For (GC) area: AC 50/60 Hz, 110V/127V/220V/240V
Dimensions (W x H x D) 430 x 130.x 401mm
Weight 5.0kg
Design and specifications are subiect to change without notice.
Weight and dimensions are approximate.
Page
NEW DIGITAL SERVO SYSTEM ...........essssenrersersenrseensnseseens 21, 22
TROUBLESHOOTING GUIDE..........sscsssenesee wu 23, 24
MEASUREMENTS AND ADJUSTMENTS..... wn 25, 26
TERMINAL FUNCTION OF IC’S.........esessseseeseee » 27~30
BLOCK DIAGRAM. .....ccscsserssssscssessesseenernesenrensnenense w 3133
SCHEMATIC DIAGRAM............ 34~39
PRINTED CIRCUIT BOARDS .............. . 40~43
WIRING CONNECTION DIAGRAM ....cccsssscsssssessenersessneseessseseeroene 44
INTERNAL CONNECTION OF FL.......cssssssssssssscrsseesnsssnsersnsesonsenss 45
REPLACEMENT PARTS LIST sssnseuad - 46~48
PACKAGING......... succenveucunandoaulbsGecedaccuadtsansccnedensansanstvastodssccivessdlceare 47
EXPLODED VIEWS...... 49~52
RESISTORS AND CAPACITORG.........sscssssssesssesssesnersesstecntestseneeee 53

Technics SL-PD647 Specifications

General

Brand	Technics
Model	SL-PD647
Category	CD Player
Language	English

Summary

NEW MECHANISM SERIES

SPECIFICATIONS

Technical details of the audio and general features.

PRECAUTION OF LASER DIODE

ACCESSORIES

CONNECTIONS

FRONT PANEL CONTROLS AND FUNCTIONS

Power STANDBYON switch

Switches the unit between on and standby modes.

Time mode select button (TIME MODE)

Selects different time display modes for track information.

Spiral button (SPIRAL)

Plays first tracks from all loaded discs sequentially.

Random mode button (RANDOM MODE)

Cycles through different random playback modes.

Repeat button (REPEAT)

Activates track or disc repeat playback.

Disc trays (1-5)

Slots for loading up to five discs.

Search buttons ( SEARCH )

Moves forward or backward through tracks.

Skip buttons (SKIPI)

Skips to the beginning of a track.

Disc buttons (DISC 1-5)

Selects a specific disc for playback.

Play button (PLAY)

Starts playback of the selected disc or track.

Loading drawer

Allows discs to be loaded or unloaded.

Program mode button (PROGRAM MODE)

Sets up programmed playback sequences.

Stop button ( STOP)

Stops playback and returns to the beginning.

Pause button (II PAUSE)

Temporarily halts playback.

Loading drawer openclose button ( OPENCLOSE)

Opens or closes the disc loading drawer.

Disc skip button (DISC SKIP)

Rotates the disc tray to select the next disc.

Display section

Disc indicators (1 (5))

Indicates which disc is currently selected or playing.

Disc number display

Shows the currently selected disc number.

Track number display

Displays the current track number being played.

Timeprogram sequence display

Shows elapsed time or program sequence.

Delete play indicator (DEL)

Indicates when a disc is in delete play mode.

Program play indicator (PGM)

Indicates when the unit is in program play mode.

Play mode indicators (YYY)

Shows current playback mode (Spiral, Random).

Repeat indicator ( )

Illuminates when repeat function is active.

Pause indicator (II)

Indicates when the unit is paused.

Play indicator ()

Indicates when the unit is playing.

BEFORE MOVING

HANDLING PRECAUTIONS FOR OPTICAL PICKUP

Handling of optical pickup

Precautions for handling the sensitive optical pickup unit.

Grounding for electrostatic breakdown prevention

Methods to prevent static discharge damage during handling.

INSTRUCTIONS FOR TRAVERSE OIL

DISASSEMBLY INSTRUCTIONS

Removal of the cabinet

Step-by-step guide for removing the main cabinet.

Removal of the front panel assy

Procedure for detaching the front panel assembly.

Removal of the tray assy

Steps to remove the disc tray assembly.

Removal of the operation P.C.B.

Instructions for removing the operation printed circuit board.

Removal of the power switch P.C.B.

Procedure for removing the power switch PCB.

Removal of the rotary tray

Steps to remove the rotary tray mechanism.

Removal of the rear cover

Guide for detaching the rear cover of the unit.

Removal of the clamp plate assy

Instructions for removing the clamp plate assembly.

Removal of the clamper assy (yoke, magnet and clamper)

Steps to remove the clamper assembly parts.

Removal of the traverse deck

Procedure for detaching the traverse deck mechanism.

Removal of the tray base guide (L)

Steps to remove the left tray base guide.

Removal of the tray base guide (R)

Steps to remove the right tray base guide.

Removal of the mechanism base assy

Procedure for removing the main mechanism base assembly.

Removal of the main P.C.B.

Steps to remove the main printed circuit board.

Removal of the worm base and sensor P.C.B.

Instructions for removing the worm base and sensor PCB.

Removal of the tray motor assy

Procedure for detaching the tray motor assembly.

Removal of the worm assy

Steps to remove the worm assembly.

Removal of the power supply P.C.B.

Instructions for removing the power supply printed circuit board.

Removal of the tray roller

Procedure for removing the tray roller.

Removal of the close lock gear and open lock gear

Steps to remove the close and open lock gears.

Removal of the drive gear(A) and drive gear(B)

Instructions for removing drive gears A and B.

Removal of the pulley gear

Procedure for removing the pulley gear.

Removal of the loading motor P.C.B.

Steps to remove the loading motor printed circuit board.

Removal of the drive cam, elevation cam and reduction gear

Instructions for removing the drive cam, elevation cam, and reduction gear.

Removal of the servo P.C.B.

Procedure for removing the servo printed circuit board.

Removal of the optical pickup

Steps to remove the optical pickup unit.

Removal of the spindle motor

Procedure for detaching the spindle motor.

Adjustment of turntable height

Instructions for adjusting the turntable height.

Installation of the elevation cam and drive cam

Steps for installing elevation and drive cams.

Installation of the worm assy

Procedure for installing the worm assembly.

Installation of the traverse deck

Steps for mounting the traverse deck.

Installation of the tray assy

Procedure for installing the tray assembly.

Notes on the installation of the FPC board for the front panel assy

Important notes for connecting the FPC board to the front panel.

HOW TO CHECK THE MAIN AND SERVO P.C.B.

Check the main P.C.B.

Procedure for checking the main printed circuit board.

Check the servo P.C.B.

Procedure for checking the servo printed circuit board.

OPERATING THE UNIT WITHOUT THE FRONT PANEL ASSY

Short the jumpers on the main P.C.B.

Instructions for shorting jumper wires for operation.

DISPLAY FUNCTION OF AUTOMATICALLY-ADJUSTED RESULTS

Procedures to display the error code

Steps to access and display error codes for diagnostics.

Error code based troubleshooting

Guide for troubleshooting based on displayed error codes.

NEW DIGITAL SERVO CIRCUIT

How to distinguish between types A and B.

Information on differentiating between servo circuit types A and B.

NEW DIGITAL SERVO SYSTEM

DIGITAL SERVO SYSTEM (OLD)

Description of the older digital servo system.

DIGITAL SERVO SYSTEM FOR TYPE A (NEW)

Description of the new digital servo system for Type A.

DIGITAL SERVO SYSTEM FOR TYPE B (NEW)

Description of the new digital servo system for Type B.

Flow chart on automatic adjustment sequence

Visual representation of the automatic servo adjustment process.

TROUBLESHOOTING GUIDE

MEASUREMENTS AND ADJUSTMENTS

Measuring Instruments and Special Tools

List of required tools and test equipment for measurements.

PREPARATION

Steps to prepare the unit for adjustments and measurements.

Adjusting Procedure

Detailed steps for performing various adjustments.

TERMINAL FUNCTION OF ICS

IC101 (AN8802 SCE1 V): Servo amp

Pin functions for the IC101 servo amplifier.

IC103 (AN8389 SE1): Coilmotor drive

Pin functions for the IC103 coil and motor drive IC.

IC102 (MN66271 MN662712 RA): Servo processordigital signal processordigital filter & DA converter

Pin functions for IC102 servo processor and D/A converter.

IC401 (UPD78043 B014): System control & FL drive

Pin functions for IC401 system control and FL drive IC.

BLOCK DIAGRAM

SCHEMATIC DIAGRAM

Terminal guide of ICs, transistors and diodes

Lists pinouts and functions for various components.

PRINTED CIRCUIT BOARDS

A SERVO P.C.B.

Layout of the servo printed circuit board.

B TRAY MOTOR P.C.B.

Layout of the tray motor printed circuit board.

C SENSOR P.C.B.

Layout of the sensor printed circuit board.

D LOADING MOTOR P.C.B.

Layout of the loading motor printed circuit board.

E POWER SWITCH P.C.B.

Layout of the power switch printed circuit board.

F OPERATION P.C.B.

Layout of the operation printed circuit board.

G MAIN P.C.B.

Layout of the main printed circuit board.

WIRING CONNECTION DIAGRAM

INTERNAL CONNECTION OF FL

Grid connection diagram

Diagram showing grid connections for the FL display.

Anode connection table

Table detailing anode connections for display elements.

REPLACEMENT PARTS LIST

EXPLODED VIEWS

Cabinet and chassis parts location

Diagram showing the location of cabinet and chassis parts.

EXPLODED VIEWS

Loading mechanism parts location

Diagram showing the location of loading mechanism components.

RESISTORS AND CAPACITORS