Panasonic rx ed 55 service manual

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ORDER NO. M09802025C2

Service Manual

Portable Stereo CD System

dfigfi

DIGITAL AUDIO

MASH *

multistage noise shaping
>l< MASH is a trademark of Nl'l'

Tape Deck: AR2 Mechanism Series
Traverse Deck: RAE01522 Series

Specnlcations
Radio
Frequency Range :
FM ; 87.5 - 108.00 MHz
AM; 522-1611 kHz
Intermediate Frequency :
FM ; 107 MHZ
AM ; 459 kHz
Sensitivity :
FM ; 3.1 WI 50 mW output (Max.)
AM ; 224 pVI rn/ 50 mW output (Max.)
CD player
Sampling frequency : 44.1 kHz
Decording : 16 bit linear

Beam source :
No. of channels :
Wow and flutter :
D/A converter :

Semiconductor laser (wavelength 780 nm)
2 channel, stereo

Less than possible measurement data
MASH (1 bit DAC)

Notes:
1. Weight and dimensions shown are approximate.
2. Design and specifications are subject to change without notice.

Tape Recorder
Track System :
Monitor System :
Recording System :
Erasing System :
Frequency Range :

Normal position ;
High position ;
Tape Speed :

General
Power output :
Speakers :
Jacks :
Output ;

Power Requirement :

AC ;
Battery ;

Memory back-up ;

Dimensions (W x H x D):

Weight:

Radio Cassette

RX-ED55

Colour

(8) ..

. Silver Type

Area
(EG) ...... Europe.
(EB) ...... Great Britain.

4 track, 2 channel, stereo
Variable sound monitor
AC bias

AC erase

50 - 12000 HZ
50 - 18000 Hz
4.8 om/s

4W x 2(RMS10%DIST.)
Bom,3t2 x 2

PHONES : 3.5 mm stereo (32 Q)

230 - 240 V, 50 Hz

Power Consumption : 32 W

12 v [Eight R20/LR20 (o. UM-1) batteries]
(Do not use rechargeable type batteries)
6 V [Four R6/LFl6 (AA, UM-3) batteries]
(Do not use rechargeable type batteries)
470 x 143 x 270 mm

4.1 kg without batteries

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.

Panasonic®

© 1998 Matsushita Electric industrial 00., Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Page 2

RX-ED55 |

I Contents
Page

Precaution of Laser Diode ................................................... -. ................ 2
Caution for AC Main Lead ..................
Handling Precautions for Traverse Deck
Accessories ........................................
Location of Controls
Setting the Clock ..
Selecting the Display
Changing the Sound Quality .
Listening to the Radio .
Listening to CDs ......
Listening to Cassettes.
Self-Diagnostic Function
Operation Checks and
Main Component Replacement Procedures

. . Page
Schematic Diagram .......................................................... 21 - 31
Printed Circuit Board Diagram .......................... .32 - 35

Type illustration of I05, Transistors and Diodes
Wiring Connection Diagram
Block Diagram ..............
Terminal Function of lC's
Measurements and Adjustments
Troubleshooting Guide .
Replacement Parts List
Cabinet Parts Location .
Mechanism Parts Locatio
Loading Unit Parts Location
Packaging

CAUTION:
THIS PRODUCT UTILIZES A LASER.

USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

I Precaution of Laser Diode

CAUTION:
Wave length: 780 nm

Maximum output radiation power from pick up: 100 pWNDE

This product utilizes a laser diode with the unit turned on", invisible laser radiation is emitted from the pick up lens.

Laser radiation from the pick up unit is safety level, but be sure the followings:

1. Do not disassemble the pick up unit, since radiation trom exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.

3. Do not lock at the focus lens using optical instruments.
4 Recommend not to look at pick up lens for a long time.

ACHTUNG:
adgestrahit.
Wellenlange: 780 nm
Maximale strahlungsleistung der laserinhelt: 100 pWNDE

Dieses produkt enthalt eine Iaserdiode. lm eingeschalteten zustand wird unsichtbare laserstrahlung von der lasereinheit

Die strahlung an der lasereinheit ist ungetahrllch, wenn folgende punkte beachtet werden:

1. Die lasereinheit nicht zerlegen, da die strahlung an der freigelegten lasardiode getahriich ist.
2. Den werksseitig justierten einstellregler der lasereinreit nicht verstellen.
3. Nicht mit optischen instrumenten in die fokussierlinse blicken.

4. Nicht iiber langere zeit in die tokussierlinse blicken.

CLASS 1

DANGER

INVISIBLE U551 MBIAIIIIII WNW OPEN.

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