Technics SU-7700 - Service Manual

ORDER NO. SD7 702-1196
Service
Manual
Stereo Integrated Amplifier
SU-7700
(XA), (XAL), (XG), (XGH),
(XSD), (XSW), (XE), (XGF)
The model SU-7700 [XA] is available in Asia,
Latin America, Middle East and Africa.
The model SU-7700 [XAL] is available in Australia only.
The model SU-7700 [XG] is available in European only.
The model SU-7700 [XGH] is available in Holland only.
The model SU-7700 [XSD] is available in Scandinavia only.
The model SU-7700 [XSW] is available in Switzerland only.
The model SU-7700 [XE] is available in England only.
The
cabinet
color
and
design
shall
be
subject
to
change
dependent
The
model
SU-7700
[XGF]
is
available
in
France
only.
on the destination
TECHNICAL
SPECI
FICATIONS
(
VFI
F)
Specifications
are
subject
to
change
without
notice
for
further
improvement.
AMPLIFIER
SECTION
Frequency
response:
PHONO
RIAA
standard
curve
t0.2dB
1k
Hz
continuous
power:
both
channels
driven
7OW
+
70W
(412)
TUNER,
AUX
5Hz
~
80kHz,
Pode
Cr
ee
|
BASS
Sree
as
eae
20Hz
~
20kHz
continuous
power:
one
controls:
90Hz,
+12dB
~
—12dB
both
channels
driven
60W
+
6O0W
(41)
TREBLE
20kHz,
+120dB
~
—12dB
SOW
+
50W
(8Q)
Equalizer
subsonic
filter:
30Hz,
~12dB/oct.
Power
bandwidth
(both
channels
driven
at
8():3Hz
~55kHz,
—3dB
“Nigh
filter:
8kHz,
—6dB/oct.
Total
harmonic
distortion:
0.08%
at
rated
power
(20Hz
~20kHz)
Loudness
control
(volume
at
~30dB):
100Hz,
+8dB
0.035%
at
half
power
(20Hz
~20kHz)
Output
voltage
and
impedance:
0.01%
at
half
power
(1kHz)
REC
OUT
(TAPE
1,
2)
150mV/1.2kQ
intermodulation
distortion:
0.08%
(60Hz
:
7
kHz
=
4:
1,
SMPTE)
REC/PLAY
(TAPE
1)
output
30mV/82k!)
Residual
hum
and
noise:
06m\y
Load
impedance:
MAIN
or
REMOTE
4~160
Damping
factor:
25
(4),
50
(8)
MAIN
+
REMOTE
8
~160
Input
sensitivity
and
impedance:
PHONO
2.5mvV/47kQ
GENERAL
TUNER,
AUX
150mV/47kQ
Power
consumption:
45
OW
PLAYBACK
(TAPE
1)
180mMV/47k2
Power
supply
(50Hz/60Hz):
110V/1
20V/220V/240V
PLAYBACK
(TAPE
2)
150mV/47k.)
240V
only
(Set
for
Australia)
REC/PLAY
(TAPE
1)
input
180mV/47kQ
Dimensions
(W
x
H
x
D):
410
x
139
x
334mm
PHONO
maximum
input
voltage
(1kHz,
RMS):
150mV
(16-5/32''x5-15/32"'
x
13-5/32"")
Signal
to
noise
ratio
(IHF,
A):
PHONO
78dB
~~
Weight:
9.7kg
(21.4
|b)
TUNER, AUX 97dB
TECHNISCHE DATEN (DIN A5 500) Spezifikationen konnen infolge von Verbesserungen ohne Ankundigung geandert werden.
VERSTARKERTEIL
Fremdspannungsabstard:
RMS-Dauertonleistung
bei
1kz:
Nennleistung
PHONO
63dB
beide
Kanale
zusammen
ausgesteuert
2x
7OW
(4)
;
TUNER,
AUX
83dB
2
x
BBW
(8Q)
—26dB
Nennausgangsleistung
PHONO
55dB
RMS-Dauertonleistung
bei
20Hz
~
20kHz:
TNUER,
AUX
08dB
beide
Kanale
zusammen
ausgesteuert
2
x
BOW
(4)
SOmW
Ausgangsleistung
PHONO,
TUNER,
AUX
53dB
2
x
50W
(8Q)
Frequenzgang:
5Hz
~
80kHz,
+OdB,
~3SdB
RMS-Dauertonleistung
bei
40Hz
~
16kHz:
3
1OH2
~
40kHzZ,
+OdB,
—1dB
beide
Kanale
zusammen
ausgesteuert
2x
60W
(4Q)
Klangregler:
BASSE
(BASS)
SOHz,
+12dB
bis
—12dB
2x
5OW
(89)
HOHEN
(TREBLE)
2OKHz.
+
12dB
bis
=120d68
Leistungsbandbreite
(beide
Kanale
zusammen
Entzerrungs
Unterschalifilter:
30Hz,
—12dB/oct.
ausgesteurt
bei
4()):
8Hz
~55kHz,
-3dB
-
Hohenfilter
(HIGH):
|
:
8kHz,
—6dB/oct.
Harmonische
Verzerrungen:
Gehorrichtige
Lautstarke
(Lautstarke
—30dB):
100Hz,
+8dB
Nennausgangsleistung
bei
1kHz,
40
0.08%
Ausgangsspannungen:
REC
OUT
(TAPE
1,
2)
150mV/1,2kQ
Nennausgangsleistung
bei
40Hz
~
16,000Hz,
4°)
0,08%
.
REC/PLAY
(TAPE
1)
Aufnahme
30mV/82k12
—26dB
Nennausgangsleistung
bei
1kHz,
40
0,1%
Kopfhérerpegel
&
Ausgangsimpedanz:
400mvV/33022
5OmW
Ausgangsleistung
bei
1kHz,
41
0.15%
Ausgangsimpedanz:
MAIN
oder
REMOTE
4~16
Intermodulationsverzerrung:
MAIN
und
REMOTE
8~162
Nennausgangsleistung
bei
250Hz
:
8,000Hz=4:1,42
0,08%
Kanaltrennung:
+1,5d8
Hum
&
noise:
0,6mV
Kanalabweichung:
90dB
Dampfungsfaktor:
25
(40),
50
(822)
Eingangsempfindlichkeit
&
Impedanz:
ALLGEMEINE
DATEN
PHONO
2,
5mV/47k
Leistungsaufnahme:
A50W
TUNER,
AUX
150mV/47kQ
~~
Netzspannung
(50Hz/60Hz):
110V/120V/220V/240V
PLAYBACK
(TAPE
1)
180mMV/47kQ)
Abmessungen
(B
x
H
x
T):
410
x
139
x
334
mm
PLAYBACK
(TAPE
2)
15O0mV/47kQ
Gewicht:
9,7kg
REC/PLAY
(TAPE
1)Eing.
180mMV/47k2
PHONO
Maximale
Eingangsspannungen
(1kHz,
RMS)
150mV
Pan
7
Matsushita
Electric
Trading
Co.,
Ltd.
Technics
PO.
Box
288,
Central
Osaka
Japan

Technics SU-7700 Specifications

General

Damping factor	30
Input sensitivity	2.5mV (MM), 150mV (line)
Output	150mV (line)
Speaker load impedance	4Ω to 16Ω
Power output	50 W per channel into 8Ω (stereo)
Signal to noise ratio	95dB (line)
Channel separation	55dB (MM)

Summary

Stereo Integrated Amplifier SU-7700

IHF Technical Specifications

Detailed IHF technical specifications for amplifier section and general parameters.

DIN 45 500 Technical Data

Technical specifications according to DIN 45 500 standards for amplifier and general data.

Technical Characteristics (THF)

Amplifier Section Specifications

Detailed amplifier specifications and harmonic distortion figures.

General Parameters

General parameters such as power consumption, power supply, and dimensions.

Control Panel Layout

Front Panel Controls and Connectors

Identification and layout of front panel controls and connectors.

Disassembly Procedures

Cabinet Removal

Step-by-step instructions for safely removing the amplifier's outer cabinet.

Chassis Removal

Instructions for carefully removing the internal chassis assembly from the cabinet.

Service Adjustment Instructions

DC Voltmeter Adjustment Procedure

Procedure for adjusting idling current using a DC voltmeter.

Ammeter Current Check Procedure

Procedure for checking and adjusting current using an ammeter.

System Block Diagram

Amplifier Signal Flow Diagram

A high-level functional block diagram illustrating the amplifier's internal signal flow.

Circuit Schematic Diagrams

SU-7700 Main Schematic

Detailed schematic diagram of the SU-7700 amplifier's circuitry.

Component Level Schematics

Power Transistor PCB Layout

Layout and component placement for power transistor PCBs.

Power Source Circuit Schematics

Schematics detailing the power supply unit and its components.

Terminal Identification Guide

Guide to terminals for transistors (TR) and integrated circuits (IC).

Integrated Circuit Block Diagram

Functional block diagram for the equalizer IC.

Printed Circuit Board Layouts

Main Printed Circuit Board Layout

Detailed layout of components on the main printed circuit board.

Replacement Parts Catalog

Integrated Circuits and Transistors List

List of integrated circuits and transistors with part numbers and descriptions.

Diodes, Coils, and Transformers

List of diodes, coils, and transformers with part numbers.

Resistor Components List

Comprehensive list of resistors with part numbers and specifications.

Component Replacement Details

Capacitors and Fuses List

List of replacement capacitors and fuses with part numbers.

Variable Resistors and Pilot Lamp

List of variable resistors, pilot lamps, and component combinations.

Exploded Assembly Views

SU-7700 Exploded View

Detailed exploded view showing the assembly of the SU-7700 unit.

Parts List - Switches, Relay, Cabinet Parts

Switches and Relay Parts

List of switches and the relay with part numbers and functions.

Cabinet and Chassis Components

Part numbers and descriptions for cabinet and chassis components.

Accessories and Packing Materials

List of included accessories and packing materials.

Cabinet Finish Illustrations

Cabinet Variations for Specific Models

Illustrations of cabinet finishes for specific models (XSD, XSW, XE).

Accessories and Packing Visuals

Visual guide to accessories and the packing procedure.

SU-7700 K Service Manual Changes

Replacement Parts List Updates

List of changes in part numbers for the SU-7700K model.

SU-7700 K Parts List Updates

Cabinet and Packing Parts Updates

Updates to part numbers for cabinets and packing materials for SU-7700K.