Technics SLEH 780 Service Manual

Page 1

AD0202029C2

Service Manual

COMPAB'I'

MAS H

mulll-sta e noise she in
DIGITAL AUDIO 9 p 9

SB-PSQS

SB

Remote
Control
Transmitter

Compact Disc Player

SL-EH780E

Traverse Deck: RAEO152Z Mechanism
series

Colour
(N) .......... Gold Type

Because of unique interconnecting cables, when a component CD Changer
requires service, send or bring in the entire system.

Specifications

Audlo section

No. of channels: 2 (left and right, stereo)

Frequency response: 20 to 20,000 Hz

(+0.5 dB to -2 dB)
Output voltage: 0.78 V (at 0 dB)
Dynamic range: 85 dB
SIN: 95 dB

Total harmonic distortion:
Wow and flutter:

0.02 % (1 kHz, 0 dB)
Below measurable limit

Digital filter: 8 ts
DA converter: 1 bit DAG MASH
Output Impedance: 1 kn

Load impedance: More than 10 kt)
Pickup section

Wavelength: 780 nm

System SC-EH180
Sound Processor SH-EH780
Tuner/Amplifier SA-EH780
SL-EH780
Cassette Deck RS-DV280
Front Speakers* SB-DV280
Center Speaker" SB-PCQS
Surround Speakers* SB-PS95
" : Made in Spain.
General
Dimensions (WxHxD): 293x89x288 mm
Mass: 2.2 kg

Notes: Specifications are subject to change without notice.
Mass and dimensions are approximate.
Total harmonic distortion is measured by the digital spectrum
analyzer.

Note on CD-R and CD-Ftw

This unit can play CD-DA format audio CD-R and CD-FlW that have
been finalized upon completion of recording. It may not be able to
play some CD-R or CD-RW due to the condition of recording.

* Finalizing is a process that enables CD-Ft/CD-RW players to play

audio CD-Fl and CD-RW.

A WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public.

It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced prolessional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

Technics

© 2002 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.

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CONTENTS

Page

1 Note -------------- - - ------- 3
2 Handling Precautions tor Traverse Deck ................................ 3
2.1. Handling of traverse deck (optical pick-up) ................... 3

2.2. Grounding tor electrostatic breakdown prevention ------------ 3

3 Precaution of Laser Diode .4
4 Location of Controls ------ i 4
5 Operation Checks and Component Replacement Proceduress
5.1. Checking for the main P.C.B. ......................................... 5
5.2. Checking for the operation P.C.B. ................................... 5
5.3. Checking for the CD servo P.C.B. ---------
5.4. Replacement for the traverse deck ass ab
5-5. Replacement for the disc tray ...............

1 0
5.6. Disassembly and reassembly for mechanism base drive

unit ------------------------------------------------------------------------------ 12

5.7. Replacement for the motor ass 5&1 ---------------

6 Error Code Display and Servo Adjustment Function

6.1. Error code display procedure ----------------------

6.2. Servo adjustment procedure ----------------------------------------- 20

6.3- Error code based on troubleshooting ----------------------------- 21

Page

7 To Supply Power Source ...................................................... 22
8 Schematic Dlagram Notes .................................................... 22
9 Schematic Diagram ............................................................... 23
10 Printed Circuit Board Diagram ---------------------------------------------- 27

11 Type Illustration of lOs, Transistors and Diodes

29
12 Wiring Connection Diagram ---------------------------- 30
13 Block Diagram ---------------------------------------------------------------------- 31
14 Troubleshooting Guide --------------------------------------------------------- 33
15 Terminal Function of ma ------------------------------------------------------ 35
15.1. IC451 (CZBBFD000256):System Control* 35
15.2. IC701 (AN8839NSBE2):Servo Amp '- 35

15.3. IC702 (MN662790RSA1):Servo Processor/Digital Signal
Processor/Digital Filter/D/A converter ---------------------------- 35

15.4. IC703 (AN87398BE2):Focus Coil/Tracking Coil/Traverse
Motor/SpindleMotor Drive
16 Replacement Parts List
17 Cabinet Parts Location
18 Loading Unit Parts Location ------------------------------------------------- 41