Technics SE-A900S

Control Amplifier
System: SU-A900D
SU-C800U
SE-A900S
System: SU-A800D
SU-C800U
SE-A800S
Remote Control
Transmitter
ORDER NO. AD9506166C8
ervice Manual
Amplifier
SU-C800U
Colour
Areas
Suffix for Area Colour
Model No.
Europe, Asia, Latin
America, Middle East,
Africa and Oceania
Remote Control
Transmitter
System: SU-A900D
Control amplifier SU-C800U
Power amplifier SE-A900S
System: SU-A800D
Control amplifier SU-C800U
Power amplifier SE-A800S
Because of unique interconnecting cables, when a component
requires service, send or bring in the entire system.
Specifications (DIN 45 500)
Total harmonic distortion Vol. Max 20 Hz — 20 kHz 0.01 %
Input sensitibity/impedance
PHONO 2.5 mV/47 kQ
TUNER, CD, AUX, TAPE 1, TAPE 2/DCC 200 mV/27 kQ
Phono maximun input voltage (1 kHz, RMS) 150 mV
S/N
PHONO 76 dB (77 dB, IHF ’66)
TUNER, CD, AUX, TAPE 1, TAPE 2/DCC 90 dB (97 dB, IHF ‘66)
Frequency response
PHONO RIAA standard curve +1 dB (30 Hz — 15 kHz)
TUNER, CD, AUX, TAPE 1, TAPE 2/DCC
3 Hz — 80 kHz (+0, — 3 dB)
+0 dB, — 0.3 dB (20 Hz — 20 kHz)
Tone controls
BASS 50 Hz, + 10 dB, -10 dB
TREBLE 20 kHz, +10 dB, —10 dB
Output voitage
TAPE 1, TAPE 2/DCC REC OUT 200 mV
PRE OUT 1V
Channel balance (AUX, 250 Hz — 6.3 kHz) +1 dB
Channel separatoion (AUX, 1 kHz) 50 dB
@ GENERAL
Dimensions (W x Hx D) 430 x 69.3 x 307 mm
Weight 2.7 kg
Notes:
1. Design and specifications are subject to change without notice.
Weight and dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
/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
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.
‘Technics
© 1995 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Technics SE-A900S Specifications

General

Brand	Technics
Model	SE-A900S
Category	Amplifier
Language	English

Summary

Product Specifications and Safety

Technical Specifications Summary

Details key performance metrics like THD, input sensitivity, S/N, frequency response, tone controls, and output levels.

Important Safety and Operational Notes

Provides essential safety warnings for technicians and operational notes for system servicing.

Operation Check and Component Replacement

Checking Operation and Main PCBs

Details procedures for checking the operation of major printed circuit boards and main components.

Power Supply and Operation Testing

Supplying Power for Standalone Operation

Describes how to connect a DC power supply to test the SU-C800U when not connected to a power amplifier.

Performing Operation Checks

Circuitry Details and Safety

Schematic Diagram Overview

Service Safety and Handling Cautions

Provides important safety notices and cautions for handling electronic components and performing repairs.

Main Circuit Schematic

Detailed Main Circuit Diagram

Presents the detailed schematic for the main circuit board, including input/output signals and component connections.

Specific Circuit Schematics

Tone, Volume, Balance, and Power Switch Circuits

Power Supply and Control Circuitry

Power Supply and Regulator Circuits

Signal Generation and Control Logic

System Connectivity and Diagrams

Wiring Connection Diagram

Illustrates the external wiring connections between the SU-C800U and other components.

System Block Diagram Overview

Detailed Block Diagram and System Connections

Comprehensive Block Diagram with Unit Connections

Replacement Parts List (Integrated Circuits to Switches)

Integrated Circuits, Transistors, and Diodes

Lists ICs, transistors, and diodes with part numbers, descriptions, and remarks for replacement.

Replacement Parts List (Connectors, Relays, and Cabinet)