Panasonic rx e 250 service manual

Page 1

ervice M

Portable Stereo Component CD System

«lulu-nan mm \hamnfi

[rites

DIGITAL AUDIO

Tape section: AR300 Mechanism series

ORDER NO. MD940504601
A6 I
Radio Cassette

RX-E250

Colour

I (K_)_. .BlackTypeJ

CD section: RAE0113Z Traverse deck series

I SPECIFICATIONS
I GENERAL

Power Requirement AC: 120 V, 60 Hz
Battery; 12 V (Eight D" size, RZO/LRZO
batterres)
Memory Backup battery tor
Computer/clock
6 V (Four AA" size, RGILRG
batteries)
Power Consumption 37 W (AC only)
Power Output Wooter;22W(1t W x 2).RMS (max)
Speaker 10 cm (4") x 2
Outputs HEADPHONES; 320, 03,5
SPEAKER; 2.7~8Q
Dimensions 597 (W) x 153 (H) x 249 (D) mm

(23/2" x 6 x 9%")
Main unit; 297 x 153 x 249 mm

Area
r7-gT-V-*li'-i-'_4l
Suffix for
I Model No. L Area Colour
(P) U.S.A )
*W __, (K)
(PC) Canada I
1-,, ___7 ifliefli .,___
No. of Channels 2 channels, stereo
Frequency Range 20 Hz - 20 kHz (40, -2 dB)
Wow and Flutter Less than possible measurement data
D/A converter MASH (i hit DAG)

I RADIO
Frequency Range FM; 87.9 - 107.9 MHz (200 Hz steps)
87.5 - 108 MHz (100 kHz steps)
AM: 520 ~17 10 kHz

Intermediate Frequency FM;10.7 MHz
AN; 450 kHz
Sensitivity FM; 8 (18/50 nW output

(-3 dB Lrnit Sens)
AM; 50 dB/rn/SO nW output

(11"lm" x 6" x 9mm") I TAPE DECK
Speaker box: 150 x 152 x 233 mm Frequency Range 30 -16000 Hz (with ncrmal tape)
(5715" x 6" x Sails) Recording System AC bias AC erase
Weight 5.4 kg (14 lbs. 14 oz) without batteries Tape Speed 4.8 cms (171a ips)
Monitor System Variable souid monitor
I CD PLAYER Track System 4-track 2 Sampling Frequency 44.1 kHz playback
Decoding tsabit linear
Beam Source Semiconductor laser (wavelength 780 nm) # fl)
l-'MASH is a trademark of NTT.
L... __ ,_ .
Notes:

1. Weights and dimensions shown are approximate.
2. Design and specifications are subject to change without notice.

* © 1994 Matsushita Electric Corporation ottm erica.
All rights reserved. Unauthorized sapling and
distribution is a violation of law.

.__ 4 __ 1- _,_._,,_

Panasonic.

Page 2

RX-E250

AX WARNING
This service literature is designed Ior experienced repairtechnicians only and is not designed for use by the general public, It does not contain
warnings or cautions to advise non-technical individuals ol 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 literature by anyone else could result in serious injury or death.

I CONTENTS

PAGE
' SAFETY PRECAUTIONS ............................................................. 2
° PRECAUTION OF LASER DIODE ............................................... 2
' LOCATION OF CONTROLS
' CONNECTION .................. .
' HANDLING PRECAUTIONS FOR TRAVERSE DECK ................ 5

' DISASSEMBLY INSTRUCTIONS ..........
' MEASUREMENTS AND ADJUSTMENTS
' SCHEMATIC DIAGRAMS ......................
'TERMINAL GUIDE OF ICs, TRANSISTORS & DIODES ........25

PAGE
' PRINTED CIRCUIT BOARD 26 ~ 31
' WIRING CONNECTION DIAGRAM ............................................ 32

0 DIGITAL SERVO SYSTEM ..
0 TROUBLESHOOTING GUIDE
'TERMINAL FUNCTIONS OF ICs ........................................ 36 ~ 39
' MECHANISM PARTS LOCATION .
0 CABINET PARTS LOCATION
0 REPLACEMENT PARTS LIST
0 RESISTORS & CAPACITORS ............................................ 49 ~ 52

I SA FETY PRECAUTION (This Safety Precaution" is applied only In the U S. A.)

1 Before servicing, unplug the power cord to prevent an electric shock.

When replacing parts, use only manulacturer 5 recommended components for safety.

Check the condition of the power cord. Replace il wear or damage is evident. .

Alter servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc. will

Before returning the serviced equipment to the customer, be sure to make the following insulation out 9 l
COW-uncle!

resistance test to prevent the customer trom being exposed to a shock hazard.

PPPI".

I . INSULATION RESISTANCE TEST

Unplug the power cord and short the two prongs of the plug with a jumper wire.

1.
2. Turn onthe power switch.
3

Measure the resistance value with ohmeter between the jumper AC plug and each exposed metal

mm.
"mini \1 I"

I)

Fig. 1
Rdblllmu=JM9752MQ

cabinet part, such as screwheads, antenna, control shafts, handle brackets, etc, Equipment with hoot-«1 D
antenna terminals should read between 3M9 and 5.2M!) to all exposed parts'. (Fig. 1) Equipment Eff," fl
Onmmeler

without antenna terminals should read approximately infinity to all exposed parts. (Fig, 2)
"Note: Some exposed parts may be isolated lrom the chassis by design, These will read infinity.
4. It the measurement is outside the specified limits, there is a possibility ot a shock hazard. The

Fig, 2
Ilium I: AUDIO! '3

equipment should be repaired and rechecked belore it is returned to the customer.

CAUTION:
THIS PRODUCT UTILIZES A LASER.

USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCES OR PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY

RESULT IN HAZARDOUS RADIATION EXPOSURE.

I PRECAUTION OF LASER DIODE

CAUTION: This unit utilizes a class 1 laser. Invisible laser radiation is emitted from the optical pick up lens when the unit is turned on:

Do not look directly into the pick up lens.

Do not disassemble the optical pick up unit.

PP'PFJNT

radiation exposure.

Do not use optical instruments to look at the pick up lens
Do not adjust the preset variable resistor on the optical pick up.

It the optical pick up is replaced, use the manufacturers specified replacement pick up only.
Use of control or adjustments or performance ot procedures other than those specified herein may result in hazardous

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