Technics SEHD 550 Service Manual

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AD0101015C25

Service Manual

Service Schematics

This publication consists of schematics for product
identified in the schematics. It is not intended as a
substitute for a service manual, which is available from
MATSUSHITA in CD or print format. For proper repair
instructions it is neccessary to consult the CD or print

version of the full service manual.

SE-HD550

Colour

(N) ........... Gold Type
Areas

(E) ........... Europe.

(EB) ......... Great Britain.

(EG) ......... Germany, Italy, France.

(E'P) ......... Russia.

requires service, send or bring in the entire system.

[Because of unique interconnecting cables. when a component

Specifications

Amplifier section (Low frequency)
Power output:
DIN1 kHz, THD 1 °/o,
both channels driven;
HMS 1 kHz, THD 10 %,
both channels driven;
Total harmonic distortion:
Halt power at 1 kHz;

2x11W(6$1)
2x15W(60)

0.07 no (6 o)

Headphones
Jack type:
Load impedance:

General

Power supply:
(E), (E6). (EP) areas:
(EB) area;

Amplifier
System SC-HD550
Tuner STsHDSSO
Amplifier SE-H D550
CD Player SLsHDSSO
_Cassette Deck FiS-HDSSO
Speakers SB-H0550

*: Made in Spain.

3.5 mm STEREO
16 - 32 (2

AC 230 V. 50 Hz
AC 230 - 240 V. 50 HZ

LDId impedance: 5 0 Power consumption: 79 W
STANDBY condition: 0.9 W
Amplifier section (High frequency) Dimensions (WxHxD): 210x104.6x273 mm
Power output: Mass: 33 kg
DIN1D kHz, THD 1 °/o,
both channels driven: 2x7 W (6 9) Notes: Specifications are subject to change without notice.
RM5 10 kHz. THD 10 "/0. Mass and dimensions are approxrrnate.
both channels driven; 2x10 W (6 Q) Total harmonic distortion is measured by the digital spectrum
Load impedance: 6 n analyzer.
SIN: 78 dB
Rated power, 2 V input, VGCA ON; 98 dB
A WARNING

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

It does not contain warnings or cautions to advise non-technical indiwduals of potential dangers in attempting to servrce 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.

Technicsi

© 2001 Matsushita Electric Industrial Co.. Ltd. All
rights reserved.
distribution is a violation of law.

Unauthorized copying and

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CONTENTS

Page

1 Schematic Diagram Notes ------------------------------------------------------ 2

1 Schematic Diagram Notes

- This schematic diagram may be modified at any time
with the development of new technology.

Notes:

5501 :
S503:
8504:
S505:

5506:
5507:
V 3501 :

Power standby/on switch( (5 /l)
Bass down switch (BASS V )

Bass up switch (BASS A )

VGCA (variable gain control amplifier)
switch (VGCA)

Treble down switch (TREBLE v )
Treble up switch (TREBLE A )
input selector VR (INPUT SELECTOR)

VR502: Volume control VFt (VOLUME)

- indicated voltage values are the standard values for the unit

measured by the DC electronic circuit tester (high-
impedance) with the chassis taken as standard. Therefore,
there may exist some errors in the voltage values.
depending on the internal impedance of the DC circuit
tester.

No mark : Power ON
- important safety notice:

Components identified by A mark have special
characteristics important for safety.

Furthermore special parts which have purposes of fire-
retardant (resistors), high-quality sound (capacitors). low-
noise (resistors). etc. are used.

When replacing any of components, be sure to use only
manufacturers specified parts shown In the parts list.

-The supply part number is described alone in the
replacement parts list.

- Caution!
IC and LSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care during
repair.
Cover the parts boxes made oi plastics with aluminum foil.
Ground the soldering iron.
Put a conductive mat on the work table.
Dolnot touch the legs ol IC or LSI with the fingers directly.
- Voltage and signal line

*- : Positive voltage line

I I * I I : Negative voltage line

:> : Audio signal line

Page
2 Schematic Diagram ................................................................. 3