Technics SU-VX620 Service Manual

U-VX620
g CONNECTIONS
To connect to each terminals
fake connections to each component in the system by using
tereo connection cables (not included).
(A) (_ “PHONO” terminals )
Connect to a turntable.
Turntable (not included)
OUT ‘a
R)
ePhono input capacitance is about 470 pF.
i “GND” terminal
This
terminalis
for
use
with
a
turntable
which
has
a
ground
wire.
Stereo connection cable White (L)
Red (R)
VOLT ADJ AC _IN~
a3 {e
SPEAKERS
(“REMOTE CONTROL OUT” terminals _)
This terminal can be used only with Technics tape deck and com-
pact disc player which have the appropriate remote control ter-
minal. (Consult your dealer for details.)
Proper connection with remote control connection cables will
allow control of some functions from this unit's remote control
transmitter.
Connect
to
a
tape
deck
and/or
compact
disc
player
as
shown
below.
If a tape deck is not being used, the compact disc player can be
connected directly (dotted line).
This unit
REMOTE
G) CONTROL
OUT
Connection cable
for remote control
(Included with tape
—| deck)
Tape deck
(not
included)
REMOTE
OUT
—~ Connection cable
for remote control
(Included with
compact disc
Ke.
player)
Compact disc
(not included) _ REMOTE
Note:
For a compact disc player with a remote control sensor the
above connection is not necessary.
ORDER NO. AD9207259C2
Service
Manual
Stereo Integrated Amplifier
SPECIFICATIONS (DIN 45 500)
20 Hz~ 20 kHz continuous power output
both channels driven 2x50 W (8 Q)
1 kHz continuous power output
both channels driven (THD: 1%) 2x65 W (8Q)
2x90 W (4 Q)
63 Hz~ 12.5 kHz continuous power output
both channels driven (THD: 0.7%) 2x60 W (8 Q)
2x 80 W (4 Q)
Total harmonic distortion
rated power at 20 Hz~ 20 kHz 0.007% (8 Q)
Intermodulation distortion (50 Hz: 7 kHz = 4:1, SMPTE)
rated power 0.007% (8 Q)
Residual hum and noise 1 mV
Damping factor 60 (8 Q), 30 (4 Q)
Headphones output level/impedance 540 mV/330 QO
Load impedance
A or B, BI-WIRING 4Q~16Q
A and B 8O~16Q
Input sensitivity/impedance
PHONO MM 2.5 mV/47 kQ
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT 150 mV/22 kO
Phono maximum input voltage (1 kHz, RMS)
MM 150 mV (IHF '66)
S/N (rated power, 4 ©)
PHONO MM 76 dB (78 dB, IHF '66)
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT
91 dB (99 dB, IHF ’66)
S/N at —26 dB power (4 Q)
PHONO MM 68 dB
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT 70 dB
‘Technics
Amplifier
SU-VX620
Colour
c etntioweane Black Type
Areas
Suffix for
Model No. Area Colour
(EG) Europe
(EB) Great Britain (K)
(EO) Switzer Land
SIN at 50 mW power (4 Q)
PHONO MM 64 dB
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT 64 dB
Frequency response
PHONO MM RIAA standard curve +1 dB
(30 Hz~ 15 kHz)
TUNER, CD, AUX, TAPE 1, TAPE 2/DAT
3 Hz~80 kHz(+0, —3 dB)
+0 dB, ~0.3 dB (20 Hz~20 kHz)
Tone controls
BASS 50 Hz, +10~-—10 dB
TREBLE 20 kHz, +10~—10 dB
Subsonic filter 30 Hz, —6 dB/oct
Loudness control (volume at — 30 dB) 50 Hz, +9 dB
Output voltage
TAPE 1, TAPE 2/DAT REC OUT 150 mV
Channel balance (AUX 250 Hz~6.3 kHz) +1 dB
Channel separation (AUX 1 kHz) 50 dB
@ GENERAL
Power consumption 230 W
Power supply AC 50 Hz/60 Hz, 230 V/240 V
Dimensions (W x H x D) 430 x 125 x 316 mm
Weight 7.8 kg
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.

Technics SU-VX620 Specifications

General

Frequency Response	3Hz to 80kHz (+0dB, -3dB)
Input Sensitivity	150 mV (Line)
Dimensions	430 x 125 x 316 mm
Weight	8.2 kg
Damping factor	60 (8 ohms)
Signal-to-Noise Ratio	100dB (line)
Speaker load impedance	4 ohms to 16 ohms

Summary

Unit Connections and Terminal Guide

Component Connection Guide

Connect main components using specified cables.

Ground and Remote Control Connections

Connect turntable ground and remote control terminals.

Technical Specifications and General Information

Technical Specifications

Detailed power output, frequency response, and distortion figures.

General Unit Information

Power consumption, dimensions, and weight.

Front Panel Controls and Functions

Front Panel Controls Overview

Describes power switch, indicators, input selectors, volume, and tone controls.

Special Function and Remote Controls

Covers loudness, subsonic filter, mode, and remote sensor functions.

Repair Preparation and Accessories

Before Repair Procedures

Power supply checks and protection circuitry explanation.

Included Accessories

Lists items provided with the unit.

Disassembly Procedures: PCBs

PCB Removal Steps

Steps for removing various circuit boards.

Power Voltage Setting

Instructions to set the correct power voltage for the unit.

Disassembly Procedures: External

Speaker and AC Connections

Connecting speakers and AC power cord.

Cabinet and Front Panel Removal

Steps to remove the outer cabinet and front panel assembly.

Disassembly Procedures: Internal

Internal Component Removal

Steps for removing power transistor, rear panel, AC inlet, phono PCB.

Main PCB and Power IC Removal

Procedures for removing the main PCB and power IC.

Maintenance and Adjustment Procedures

Foot Replacement and PCB Check

Procedure for replacing feet and checking main PCB.

Voltage Control Amplifier Adjustment

How to adjust the V-amp idling (ICQ).

Circuit Schematic Diagrams

Phono, Main, and Switch Circuit Diagrams

Schematics for phono EQ, main, and switch circuits.

Input Selector and Remote Sensor Circuit Diagrams

Diagrams for input selector and remote sensor circuitry.

Circuit Schematic Diagrams

Circuit Diagram Details

Continuation of circuit diagrams for various sections.

Circuit Schematic Diagrams

Circuit Diagram Details

Further continuation of circuit diagrams.

Circuit Schematic Diagrams

Circuit Diagram Details

Final continuation of circuit diagrams.

Printed Circuit Board Layouts

Main, Input Selector, Phono, Volume PCBs

Layouts for main, input selector, phono, and volume circuit boards.

Switch PCB Layout

Layout of the switch circuit board.

Printed Circuit Board Layouts

V-Amp and Remote Sensor PCBs

Layouts for V-amp and remote sensor circuit boards.

Component Identification and Wiring Guides

Operation, AC/Volt Adj, Power Switch PCBs

Layouts for operation, AC/Volt adj, and power switch PCBs.

Terminal Guides and Wiring Diagrams

Guides for ICs, transistors, diodes, and overall wiring.

Wiring Diagram and IC Terminal Functions

Wiring Connection Diagram

Overall wiring schematic of the unit.

IC801 Terminal Functions

Detailed pin functions for IC801 (Micro Computer).