Technics SU-Z55 Service Manual

ORDER NO. $D83062525C8
Service Manual
Stereo Integrated DC Amplifier
SU-Z55
(E], [EGA], [EK], [EF], [EH].
[EB], [Ei], [XA], [XL], [PC]
SU-Z55(k)
[E], [EGA], [EK], [EH].
[EB], [XA], [PC]
Areas
is available in Switzerland and Scandinavia.
is available in F. R. Germany.
is available in United Kingdom.
is available in France.
is available in Holland.
is available in Belgium.
is available in Italy.
is available in Southeast Asia, Oceania,
Africa, Middle Near East and Central
South America.
is available in Australia.
is available in European Audio Club.
* The colors of this model include silver and black,
* The black type model is provided with (K) in the Service Manual.
Specifications (Specifications are subject to change without notice for further improvement.)
(DIN 45 500) ai
@ AMPLIFIER SECTION rated power (40)
PHONO 75 dB (IHF, A: 81 dB)
TUNER, AUX/CD/VIDEO, TAPE 1, 2
40
Hz~
20
kHz
continuous
power
output
86
dB
(IHF,
A:
97
dB)
both
channels
driven
2
X
45W
(40)
2
X
40W
(80)
—26
dB
power
(4)
PHONO
TUNER, AUX/CD/VIDEO, TAPE 1, 2
50 mW power (42)
PHONO
0.05%
(42)
TUNER,
AUX/CD/VIDEO,
TAPE
1,
2
0.03%
(8)
Tone
controls
0.05% (4) BASS
0.03% (82) TREBLE
0.05% (49) Loudness control (volume at —30 dB)
0.03% (8) Output voltage and impedance
65 dB
1
kHz
continuous
power
output
65
dB
both
channels
driven
2X
50W
(49)
2 X 42W (89) ee
Total
harmonic
distortion
62
dB
rated power at 40 Hz~20 kHz
50 Hz, +10 dB~ —10 dB
20 kHz, +10 dB~ —10 dB
50 Hz, +9 dB
rated power at 1 kHz
half power at 40 Hz~20 kHz
150 mV
0.007% (42) REC OUT
Channel balance, AUX/CD/VIDEO 250 Hz~6,300 Hz
Channel separation, AUX/CD/VIDEO 1 kHz
Headphones output level and impedance
Load impedance
MAIN or REMOTE
MAIN and REMOTE
@ GENERAL
Power consumption 310W
Power supply
For United Kingdom and Australia AC 50 Hz/60 Hz, 240V
For continental Europe AC 50 Hz/60 Hz, 220V
For others AC 50 H2z/60 Hz, 110V/120V/220V/240V
Dimensions (WXHXD) 430 X 86 X240 mm
(16-15/16 "x 3-3/8"'x9-7/16")
' 5.1kg
half power at 1 kHz
0.005% (8Q)
0.01% (40)
0.01% (49)
~26 dB power at 1 kHz
50 mW power at 1 kHz
Intermodulation distortion
rated power at 250 Hz: 8 kHz=4:1, 40 0.05%
rated power at 60 Hz: 7 kHz=4:1, SMPTE, 8Q 0.03%
Power bandwidth
both channels driven, —3 dB
10 Hz~25 kHz (49)
10 Hz~25 kHz (82)
0.8 mV
20 (40), 40 (89)
Residual hum and noise
Damping factor
Input sensitivity and impedance
PHONO
TUNER, AUX/CD/VIDEO, TAPE 1, 2
PHONO maximum input voltage (1 kHz, RMS)
Frequency response
PHONO
2.5 mV/47kQ
150 mV/22kQ
150 mV
RIAA standard curve
+0.8 dB (30 Hz~15 kHz)
TUNER, AUX/CD/VIDEO, TAPE 1, 2
10 Hz~80 kHz (-3 dB)
Technics
+1 dB
50 dB
420 mV/330
BQ-~ 160
4N-~160
Weight
Note:
Total harmonic distortion is measured by the digital ssectrum
analyzer (H.P. 3045 system).
Matsushita Electric Trading Co., Ltd.
PO. Box 288, Central Osaka Japan

Technics SU-Z55 Specifications

General

Brand	Technics
Model	SU-Z55
Category	Amplifier
Language	English

Summary

Specifications

Amplifier Section Specifications

Detailed technical specifications for the amplifier's audio performance.

Signal-to-Noise Ratio (S/N)

Performance metric detailing the noise floor relative to signal output.

General Specifications

Key operational parameters including power consumption, dimensions, and weight.

Safety Precautions

Insulation Resistance Test

Procedure to verify electrical safety and prevent shock hazards.

Before Repair and Adjustment

Protection Circuitry

Disassembly Instructions

Cabinet and Front Panel Removal

Instructions for detaching the main chassis and front panel assembly.

Front Panel PCB Removal

Procedure for removing circuit boards attached to the front panel.

Front Panel and Sub-panel Removal

Steps to detach the front panel and sub-panel from the chassis.

Control Button and Knob Removal

Guide to removing various control buttons and rotary knobs.

Power Amplifier IC Removal

Procedure for removing the critical power amplifier integrated circuit.

Printed Circuit Board Diagrams

Component Terminal Guide

Pin configurations and identifiers for transistors, diodes, and integrated circuits.

Power Amplifier Protection

Speaker Terminal Short Circuit Protection

Explanation of the protection triggered by speaker terminal short circuits.

Block Diagram

Overall Schematic Diagrams

Signal Path Schematics

Schematics detailing input, equalizer, selector, tone, volume, and thermal circuits.

Power Amplifier and Supply Schematics

Schematics for power amplifier, muting, and power supply sections.

Schematic Diagram Notes

Important notes and clarifications related to the schematic diagrams.

Replacement Parts List

Safety Component Identification

Information on identifying components crucial for safety during replacement.

Exploded View

Area-Specific Circuit Changes

Service Manual Corrections

Product Name Correction

Correction regarding the accuracy of the product name mentioned.

Voltage Value Correction

Correction of voltage values specified for certain components.

Schematic Diagram Correction

Correction to voltage lines within the schematic diagram.

Parts List Correction

Note referencing corrections to the replacement parts list.

Power Amplifier Protection Correction

Reference to supplement for correct power amplifier protection parts.