Panasonic sl ct 720 eb service manual

Page 1

AD0502011CS

Service Manual

COMPACT

DIGITAL AUDIO

Specifications

Audio (CD-DA)
Sampling frequency:
No. of channels:

Headphones output level:

Frequency response:
Output voltage:
SIN -

Wow and flutter:
DIA converter:
Pickup

Light source:
Wavelength:

M P3
Supported bit rates:

Supported sampling
frequency:

Maximum number of items

44.1 kHz

2 channels (left and right, stereo)
HMS max. 6 mW+6 mW/16 (2
(adjustable)

20 to 20,000 Hz (+0 dB to -1.5 dB)
06 Vrms (50 k0.)

More than 96 dB

Below measurable limit

1 bit, MASH

Semiconductor laser
780 nm

(Support variable bit rate)
32 kbps to 320 kbps
(128 kbps is recommended)

48 kHfl44.1 kHz/32 kHz

(total no. at albums and tracks):999

Maximum album levels:

General

100

Operational temperature range: 0 - 40 degree
Rechargeable temperature range: 5 - 40 degree

Power supply:

DC input (via included AC

adaptor);

AC adaptor input;
SL-CT720GD;
SL-CWzoSG;

DC 4.5 V

AC 220 V. 60 HZ
AC 110 -127/220 - 240 V, 50/60 Hz

Panasonic

Portable CD Player

SL-CT720P

SL-CT720PC
SL-CT720EB
SL-CT720EE
SL-CT720EG

Colours

(A) ........... Blue Type [Except for SL-CT72OP]
(S) ........... Silver Type [Except for SL-CT72OPC]
(D) ........... Orange Type [SL-CT72OPC only]

Power consumption:

Using AC adaptor (MP3ICD-DA);
0.9 W/0.8 W
Recharging; 3.7 W
Play time:
Using an a flat stable surface at 25 degree, E0 is off, Hold is on, Anti-
skip is on P08 1 (CD-DA), recommended bit rate (MP3:128 kbps),
and the Digital Re-master is off (MP3). Play times are in hours and
approximate.
Batteries used:

2 alkaline batteries (LRS);

MP3 disc/CD-DA disc

Approx, 120/70 h
2 supplied rechargeable batteries;
Approx. 50/28 h
2 supplied rechargeable and 2 alkaline batteries;
Approx, 170/100 h
o The play time may be less depending on the operating conditions.
. Play time will be considerably reduced when playing CD-RW.
Recharging time: Approx. 3 to 4 h
Dimensions (W x H x D): 136,4x16.1x136.4 mm
Mass: 200 g (with batteries)
154 9 (without batteries)

Notes: Specifications are subject to change without notice.
Mass and dimensions are approximate.

Note on CD-R and CD-RW (CD-DAIMP3 only)

For CD-DA format, use a music disc and finalize it after recording.
The unit may not be able to play some discs due to the condition of
the recording.

A process performed after recording that enables CD-R/CD-RW
players to play audio CD-R and CD-RW.

© 2005 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.

Page 2

SL-CTI20P / SL-CT720PC I SL-CT7ZDEB / SL-CT720EE l SL-C'I'IZDEG

AWARNING

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 professional 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.

CONTENTS

Page
1 Accessories ............................................................................ 3
2 Location of Controls ............................................................... 3

3 PreCaution ot Laser Diode .....................
4 Handling Precautions for Traverse Deck --

4.1. Handling of traverse deck (optical pick-up)-
42. Caution when replacing traverse deck ----------------------------- 5
4.3. Grounding for electrostatic breakdown prevention ------------ 5
5 Operation Checks and Component Replacement ProceduresG
5.1. Checking for the PCB. -------------- 6
5.2. Replacement for the CD lid unit, shalt plate, spring A and
...... 7
5.3. Replacement for the traverse motor and optical pick-up ---9
0
-10
6 Display of Self-Diagnostic Function ------------------------------------- 10

spring B -------------------------------------------------

54. Replacement for the rest switch

5.5. Replacement for the spindle motor

7 Checking the Operation Problems on the Traverse Deck
(Optical Pick-up) ------------------------------------------------------------------- 11
7.1. Check the operations described below on the traverse
------------------- 11
8 Automatic Adjustment Results Display Function (Selfvcheck

deck after replacing ........

Function) ------------------------------------------------------------------------------- 12

Page

8.1. How to display automatic adjustment results ----------------- 12
8.2. Display of automatic adjustment results (Self-Check

Function) -----------------
9 Type Illustration of [05, Transrstors and Diodes

1!] Schematic Diagram Notes

11 Schematic Diagram --------------------------------------------------------------- 15
12 Printed Circuit Board and Wiring Connection Diagram -------- 19
13 Block Diagram ---------------------------------------------------------------------- 21
14 Terminal Function ol Ics ...................................................... 23

14-1. ICSOHCZBBGFOOOGSG): System Control ----------------------- 23

14.2. |0501(MN6627962JB): Servo Amp, Servo Processor,
Digital Signal Processor, Digital Filter & D/A Converter --23

15 Supply 01 Rechargeable Battery as Replacement Parts 25

16 Caution in use at Rechargeable Battery ----------------------- -- 25
17 Replacement Parts List --------------------------------------------------------- 26
13 Cabinet Parts Location --------------------------------------------------------- 29
19 Traverse Unit Parts Location ------------------------------------------------ 30
20 Packaging ----------------------------------------------------------------------------- 31

20.1. For SL-CT720P/PC ------------------------------------------------------ 31

20.2. For SL-CT720EB/EE/EG ----------------------------- 32

21 Schematic Diagram for printing with letter size ................... 33