Technics SU-V90D

Service
Man
Digital Integrated Amplifier
OS 250464
SV MNL
'
91004988 4
SM—-SUVIOD
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SPECIFICATIONS coin 45 500)
@ MAIN AMP. SECTION
20 Hz~20 kHz continuous power output
both channels driven 2 X 100W (8Q)
1 kHz continuous power output
both channels driven 2X 150W (49)
2 X 115W (80)
Total harmonic distortion
rated power at 20 Hz~20 kHz 0.002% (89)
rated power at 1 kHz 0.0007% (89)
half power at 20 Hz~20 kHz 0.002% (89)
half power at 1 kHz 0.0007% (89)
Intermodutation distortion
rated power at 250 Hz: 8 kHz=4:1, 80 0.005%
rated power at 50 Hz: 7 kHz=4:1, SMPTE, 8Q
0.005%
Power bandwidth
both channels driven, —3 dB
5 Hz~60 KHz (8, 0.025%)
Residual hum and noise 0.8 mV
Damping factor 30 (49), 60 (82)
Headphones output level and impedance
700 mV/3300
Load impedance
MAIN or REMOTE 4N~16
MAIN and REMOTE 8N~160
@ PRE AMP. SECTION
Input sensitivity and impedance
PHONO MM 2.5 mV/47kQ
MC 170 xV/2200
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT
150 mV/18kQ
POWER AMP DIRECT 1V/47kQ
Technics
PHONO maximum input voltage (1 kHz, RMS)
MM 160 mV
MC 12 mV
S/N
rated power (4Q)
PHONO MM 79 dB (88 dB, IHF, A)
MC 70 dB (72 dB, 250 uV, IHF. A)
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT
100 dB (JHF, A: 106 dB)
POWER AMP DIRECT
106 dB (IHF, A: 115 dB)
—26 dB power (40)
PHONO MM 79 dB
MC 68 dB
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT
86 dB
50 mW power (40)
PHONO MM 76 dB
MC 69 dB
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT
80 dB
Frequency response
PHONO RIAA standard curve
+0.2 dB (20 Hz~20 kHz)
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT
0.8 Hz~150 kHz (-3 dB)
+0, -0.1 dB (20 Hz~20 kHz)
POWER AMP DIRECT 0.8 Hz~150 kHz (—3 dB)
Tone controls
BASS 50 Hz, +10 dB~ —10 dB
TREBLE 20 kHz, +10 dB~—10 dB
Loudness control (volume at —30 dB)
50 Hz, +9 dB
Matsushita
Electric
Trading
Co.,
Ltd.
PO. Box 288. Central Osaka Japan
Color
(K)z.cetses Black Type
Continental Europe.
Holland.
Belgium.
France.
United Kingdom.
[EG] ........... F.R.Germany.
Asia,Latin America,
Middle Near East,
Africa & Oceania.
East PX.
European Military.
Muting —20 dB
Output voltage and impedance
TAPE1, 2/DAT REC OUT 150 mV
Channel balance, AUX 250 Hz~6,300 Hz +1dB
Channel separation, AUX 1 kHz 55 dB
M@ DIGITAL SECTION
Harmonic distortion 0.002%
Total harmonic distortion 0.003%
S/N 110 dB
Dynamic range 99 dB
Frequency response
2 Hz~20 kHz, +0.3 dB. —0.3 dB
@ GENERAL
Power consumption 765W
Power supply
For continental Europe AC 50 Hz/60 Hz, 220V
For United Kingdom, Australia and others
AC 50 Hz/60 Hz, 110V/127V/220V/240V
Dimensions (WxH~D) 430 x 158 x 397 mm
(16-15/16" x 6-7/32" x 15-5/8")
Weight 13.2 kg (29.04 Ib.)
Notes:
1. Specifications are subject to change without
notice.
Weight and dimensions are approximate.
2. Total harmonic distortion is measured by the
digital spectrum analyzer (H.P. 3045 system).
Panasonic Tokyo Office
Matsushita Electric Trading Co., Ltd.
6th Floor, Worid Trade Center Bidg.,
No. 4-1, Hamamatsu-cho 2-Chome, Minato-ku,
Tokyo 105, Japan
ORDER
NO.
HAD8802028C9
|
SU-V90D]
ual
Amplifier
SU-V90D
m CONTENTS
Page
BEFORE REPAIR AND ADJUSTMENT ................- 2
PROTECTION CIRCUITRY
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LOCATION OF CONTROLS. 0.0... cc cecececeeeeeceneeeeene 3,4
CONNEGTIONS |... 5. sescbeveceeese aus Syaceaseseecteessusexsentes ods 5,6
DISASSEMBLY INSTRUCTIONS ............cceeeseteee 7~ 10
SCHEMATIC DIAGRAM .... cee cece cecseceeeseneteeneeeees 11 ~ 22
TERMINAL GUIDE OF
TRANSISTORS, DIODES AND IC’S ............000 22
Page
PRINTED CIRCUIT BOARDS .............cccecceeeeeeeerereneee 23 ~ 28
BLOCK DIAGRAM uo... ee eee ceee eee eee cece eneeee rece neneeeenaee 29,30
WIRING CONNECTION DIAGRAM .............cceeeeeeeeee 31,32
FUNCTION OF IC TERMINALS. ou... eeceeeeeeeaeeees 33,34
MEASUREMENTS AND ADJUSTMENTS ............... 35,36
EXPLODED VIEW ....sescscccsssstssessecenseteetee
REPLACEMENT PARTS LIST ......--eses00
RESISTORS AND CAPACITORS
m= BEFORE REPAIR AND ADJUSTMENT
(1) Turn off the power supply. Using a 100, 10W resistor, shortcircuit both ends of power supply capacitors
(C609,C610)in order to discharge the voltage.
(2) Before turning on the power switch of the unit.
A. Connect the voltage controller to the primary side.
B.
Connect
the
AC
ampere
meter
to
the
primary
side
or
connect
the
DC
voltage
meter
to
the
“+B”
circuit
of the secondary side.
C. Turn the VR of ICQ(VR401,VR402,VR551 and VR552)to minimum(counterclockwise).
D. After setting the output to zero of the voltage contoller,turn on the power switch of the unit.
And increase the output of voltage controller gradually.
Then, check carefully whether the current value of primary side become more than following value or
whether the DC voltage of secondary side is increasing slowly.
E. If the value of current is increasing unusually or the DC voltage is not increasing,lower the output
level of voltage contoller immediately.
@ The current value of the primary side at no signal. (Confirm the power supply voltage of each area and provided
voltage of the unit.)
The protection circuitry of the amplifier may have
operated if either of the following conditions is noticed:
@ No sound is heard when the power is turned on.
@ Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage
if, for example, the positive and negative speaker
connection wires are “shorted” , or if speaker systems with
an impedance less than the indicated rated impedance
of the amplifier are used.
ACCESSORY
@ AC power SUPPLY COP... cece cece ceceseeneeeneaeaaaeneaees 1
For United Kingdom and some areas, the power cord is directly
attached to the unit.
Configuration of AC power supply cord differs according to
area.
Power supply voltage AC110V AC127V AC220V AC240V
Consumed current 50/60Hz 270 ~ 730mA 240 ~ 630mA 130 ~ 370mA 120 ~ 330mA
m PROTECTION CIRCUITRY
If this occurs, follow the procedure outlined below:
1.Turn off the power.
2.Determine the cause of the problem and correct it.
3.Turn on the power once again.
Note:
When the protection circuitry functions, the unit will not
operate unless the power is first turned off and then
on again.
SFDACO5E03
[E, EF, El, EB, EH, EG)
QFC1205M [EK]
SJA190 [XL]
SJA111 [XA]
RJAS2YA [PA, PE]

Technics SU-V90D Specifications

General

Brand	Technics
Model	SU-V90D
Category	Amplifier
Language	English

Summary

Specifications Overview

Amplifier Performance Details

Covers main amp, digital section, and general specs like power, dimensions, and distortion.

Safety and Pre-Repair Checks

Procedures for safe operation and initial checks before performing repairs.

Location of Controls

Front Panel Controls

Identifies and describes the function of each control on the front panel of the amplifier.

Block Diagram Overview

Visual representation of the amplifier's internal signal flow and component connections.

Connections Guide

Analog and Digital Input Connections

Guides for connecting analog and digital audio sources to the unit.

Speaker and Power Connections

Instructions for connecting speakers and the AC power cord.

Disassembly Instructions

Cabinet and Main PCB Removal

Steps to remove the outer cabinet and the main printed circuit board.

Component PCB Removal

Procedures for removing specific circuit boards like digital input and DAC.

Disassembly Instructions (Continued)

Small PCB and Switch Removal

Instructions for removing smaller PCBs, including input, speaker, and switch boards.

Audio Function PCBs Removal

Procedures for removing PCBs related to headphones, tone, volume, and phono controls.

Disassembly Instructions (Continued)

Main PCB and Power Transistor Removal

Steps to remove the main PCB and power transistors, with critical safety notes.

Schematic Diagram

Digital Input and DAC Circuits

Schematics for digital input processing and digital-to-analog conversion stages.

Audio Amplifier Circuitry

Schematic diagrams illustrating the main audio amplification stages.

Critical Safety Precautions

Essential safety guidelines for handling electronic components and avoiding static discharge.

Schematic Diagram (Continued)

DA Converter and Audio Amp Schematics

Continuation of schematics for D/A conversion and audio amplification stages.

Schematic Diagram (Continued)

Phono, Input Selector, and Switch Circuits

Schematics for phono EQ, input selector, and various switching functions.

Indicator and Output Terminal Circuits

Schematics for input/rec indicators and input/output terminal connections.

Schematic Diagram (Continued)

Volume, Tone, and LED Circuits

Schematics detailing volume control, tone amplification, and LED driver circuits.

Schematic Diagram (Continued)

Power, Control, and Protection Circuits

Schematics covering power supply, voltage control, current drive, and protection systems.

Schematic Diagram (Continued)

Speaker and Power Switch Circuits

Schematics for speaker terminals, headphone jacks, and power switch.

Component Terminal Guides

Reference charts detailing terminal pinouts for transistors, diodes, and ICs.

Printed Circuit Board Layouts

Audio Amplifier and Power Control PCBs

Layout diagrams for audio amplifier and power control/source PCBs.

Input Selector and Speaker Terminal PCBs

Layouts for input selector and speaker terminal circuit boards.

Printed Circuit Board Layouts (Continued)

Various Audio and Conversion PCBs

Layouts for volume, tone, D/A converter, and phono selector PCBs.

Printed Circuit Board Layouts (Continued)

Digital Input and Switch PCBs

Layouts for digital input terminal, switch, and indicator PCBs.

HeadphoneSpeaker and Power Switch PCBs

Layouts for headphone/speaker jack and power switch PCBs.

Block Diagram

Overall Signal Path Illustration

Comprehensive block diagram illustrating the signal flow and component interactions within the amplifier.

Wiring Connection Diagram

Power, Speaker, and Headphone Wiring

Diagrams illustrating connections for AC power, speakers, and headphones.

Audio InputOutput and Digital Wiring

Diagrams showing wiring for audio inputs/outputs and digital signal connections.

Functions of IC Terminals

Digital Interface IC Functions

Detailed pinout and function description for the digital interface IC (YM3623B).

Digital Filter and Converter IC Functions

Pinout and function details for digital filter (YM3404B) and converter ICs.

Measurements and Adjustments

Amplifier Idling Current Adjustments

Procedures for adjusting idling currents in voltage and current drive amplifiers.

DA Converter Offset Adjustment

Steps for calibrating the DC offset of the D/A converter stages.

Measurements and Adjustments (Continued)

Calibration Point Identification

Diagrams showing adjustment VR and test point locations for calibration.

Exploded View

Front Panel Assembly Diagram

Exploded view illustrating the assembly and parts of the front panel.

Exploded View (Continued)

Internal Chassis Assembly Diagram

Exploded view detailing the internal chassis structure and component layout.

Replacement Parts List

Cabinet and Chassis Parts

List of external parts for the cabinet, chassis, and front panel.

Integrated Circuits and Transistors

Replacement part numbers for integrated circuits and transistors.

Diodes and Basic Components

Replacement part numbers for diodes, basic components, and fuses.

Replacement Parts List (Continued)

Switches, Coils, and Transformers

Replacement part numbers for switches, coils, and transformers.

Resistors & Capacitors Selection Guide

Guide for selecting resistors and capacitors by type, value, and tolerance.

Packing Materials and Accessories

List of included packaging materials and accessories.

Replacement Parts List (Continued)

Detailed Resistor and Capacitor Listings

Continuation of detailed part number listings for resistors and capacitors.

Replacement Parts List (Continued)

Comprehensive Resistor and Capacitor Data

Final continuation of detailed part number listings for resistors and capacitors.