Technics SU-V4X User manual

Technics
Stereo Integrated Amplifier
SU-V4X
OPERATING INSTRUCTIONS
Also available in black.
Notes:
• Specifications differ according to the area code.
• The "EK” area code, for example, indicates United Kingdom specifica¬
tions.
• The "EK" indication is shown on the packing case and serial number tag.
Before operating this unit, please read these instructions completely.

ENGLISH
eajo Sftejteo; J?
CUV
We want to thank you for selecting this product and to
welcome you to the growing family of satisfied
Technics product owners around the world.
We feel certain you will get maximum enjoyment from
this new addition to your home.
Please read these operating instructions carefully,
and be sure to keep them handy for convenient
reference.
CONTENTS
•ACCESSORY . 2
• BEFORE USING THIS UNIT. 2
• FOR UNITED KINGDOM . 2
• MAINTENANCE OF EXTERNAL SURFACES . 2
• FOR SAFE USE OF THIS UNIT. 3
•STEREO SYSTEM COMPONENTS
AND THEIR CONNECTIONS . 4
•FRONT PANEL CONTROLS
AND THEIR FUNCTIONS . 6
•OPERATION. 8
• RECORDING . 9
•TECHNICAL SPECIFICATIONS .10
• PROTECTION CIRCUITRY .10
•TROUBLESHOOTING GUIDE .11
ACCESSORY
•AC power supply cord (Except for Australia) . 1
BEFORE USING THIS UNIT
Be sure to disconnect the mains cord before adjusting the voltage
selector.
Use a minus (-) screwdriver to set the voltage selector (on the
bottom panel) to the voltage setting for the area in which the unit
will be used.
Note that this unit will be seriously damaged if this setting is not
made correctly. (There is no voltage selector for some countries;
the correct voltage is already set.)
FOR UNITED KINGDOM
("EK" area code model only)
The "EK” indication is shown on the name plate.
Important
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE.
BLUE: NEUTRAL
BROWN: LIVE
As the colours of the wires in the mains lead of this unit may not
correspond with the coloured markings identifying the terminals in
your plug, proceed as follows. The wire which is coloured BLUE
must be connected to the terminal which is marked with the letter N
or coloured BLACK.
The wire which is coloured BROWN must be connected to the
terminal which is marked with the letter L or coloured RED.
MAINTENANCE OF EXTERNAL
SURFACES
To clean, use a soft dry cloth.
If the surfaces are extremely dirty, use a soft cloth, dipped into a
soap and water solution or a weak detergent solution.
Wring the cloth well before wiping the unit.
Wipe once again with a soft dry cloth.
Never use alcohol, paint thinner, benzine, nor a chemically treated
cloth to clean this unit.
Such chemicals may damage the finish of your unit.
2

FOR SAFE USE OF THIS UNIT
■ Use a standard electrical AC wall outlet
1. Use from an AC power source of high voltage, such as for
air conditioners, is very dangerous.
Be extremely careful not to make a connection to the electrical
outlet for a large air conditioner or central-heating unit which
uses high voltage, because there is the possibility of fire.
2. A DC power source cannot be used.
Be sure to check the power source carefully, especially on a
ship or other place where DC is used.
■ Connection and removal of the power cord
plug
1. Wet hands are dangerous.
A dangerous electric shock may result if the plug is touched by
wet hands.
2. Don't pull the power cord.
Always grasp the plug; never pull the cord itself.
■ Never attempt to repair or reconstruct this unit
A serious electric shock might occur if this unit is repaired,
disassembled or reconstructed by unauthorized persons, or if the
internal parts are accidently touched.
■ For families with children
Never permit children to put anything, especially metal, inside this
unit. A serious electric shock or malfunction could occur if articles
such as coins, needles, screwdrivers, etc. are inserted through the
ventilation holes, etc. of this unit.
■ Turn off after use
If the unit is left for a long time with the power on, this will not only
shorten its useful operation life, but may also cause other
unexpected trouble.
■ If water is spilled on the unit
Be extremely careful if water is spilled on the unit, because a fire or
serious electric shock might occur. Immediately disconnect the
power cord plug, and consult with your dealer.
■ Place the unit where it will be well ventilated,
and away from direct sunlight
Place this unit at least 10 cm (4") away from wall surfaces, etc.,
and away from direct sunlight. Be careful that curtains and similar
materials do not obstruct the ventilation holes.
■ Keep the unit away from heaters, etc.
Heat can damage the external surfaces as well as internal circuits
and components.
■ Avoid spray-type insecticides
Insecticides might cause cracks or “cloudiness" in the cabinet and
plastic parts of this unit. The gas used in such sprays might,
moreover, be ignited suddenly.
■ Never use alcohol or paint thinner
These and similar chemicals should never be used, because they
may damage the finish.
■ If trouble occurs
If, during operation, the sound is interrupted or indicators no longer
illuminate, or if abnormal odor or smoke is detected, immediately
disconnect the power cord plug, and contact your dealer or an
Authorized Service Center.
-3 -
ENGLISH

PHONO
RECOUT PLAYBACK
'-TAPE 1/OA TAPE--'
Connection to second tape deck.
Tape deck (option)
“VIDEO/AUX”
terminals
<l> (R) l
AUDIO OUTPUT
TV (option)
H) (L) Turntable (option)
* T
(GND)
‘TAPE 2” term naIs
In addition to a tape deck, the audio from a digital
audio processor or video cassette recorder
(stereo type) can be connected here.
If such equipment is connected, connect the tape
deck to the “TAPE 2" terminals.
Tape deck (option) ‘
LINE IN LINE OUT
LINE OUT
A graphic equalizer or a microphone-mixing
amplifier can be connected these terminals.
Notes:
1. When these terminals are not in use, be sure
to insert the shorting pins (included).
2. These terminals are not the same as con¬
ventional “PRE OUT" and "MAIN IN" ter¬
minals. Therefore, this unit cannot be used
in a multi-amplifier system or a three-dimen¬
sional system.
Connect a turntable.
Connect a tuner.
Tuner (option)
Connect a compact disc player.
Compact disc player (option)
Connect a TV etc. These terminals are for
audio playback only.
LINE IN LINE OUT
n ti
(R) (L) (R) (L)
OUTPUT
T T
(R) (L)
Shorting pins
© Jr (included)
EXT OUT EXT IN
Graphic equalizer, etc.(option)
STEREO SYSTEM COMPONENTS AND THEIR CONNECTIONS
TAPE 1/DA TAPE” terminals
"EXT OUT EXT IN” terminals
“TUNER” terminals
“PHONO” terminals
“CD” terminals

‘SPEAKERS” terminals
■ Load impedance:
MAIN and REMOTE 8~16n
MAIN or REMOTE 4-160
■ Connection of speaker wires
1. Strip off the outer covering, and twist the
center conductor.
Note:
To prevent damage to circuitry, never short-
circuit plus (+) and minus (-) speaker
terminals.
15 mm (19/32")
2. Turn completely
to the left.
3. Insert wire and turn
completely to the right.
Pull wire to be sure
it won't come out.
Twist
■ “REMOTE” terminals
Connection to second pair of speakers.
CAUTION:
ADJUST SWITCH TO IMPEDANCE
OF CONNECTED SPEAKERS
REFER TO INSTRUCTION
MANUAL
CAUTION:
TO PREVENT ELECTRIC SHOCK.DO NOT REMOVE COVER.
NO USER-SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL
Technics
MODEL No. SU-V4X
STEREO INTEGRATED AMPLIFIE
POWER SOURCE:'V50/60HJ - 390K
Mir'd by MalsusWa Electric hdustnal Co.Ud
MadenJapan
-'VAC IN-
AC power supply
cord (included)
1
AC
outlet
For Australia
AC power supply cord is not connected
separately; it is connected directly
to the rear panel.
Speaker impedance selector (SPEAKER IMPEDANCE)
Set to the position corresponding to the impedance of the speaker systems being
used.
If this setting is not correctly made, the result may be a deterioration of
performance.
■ If either the main or the remote speaker systems are used:
4~6fi (•—«):
For speaker impedance of 4—6fl.
8~16fi(.—l):
For speaker impedance of 8~16fi.
■ If both main and remote speaker systems are used:
8fi(A--):
For speaker impedance of 8fi or more and less than 1611.
16SM-—»):
For speaker impedance of 160.
Note that, if 2 pairs of speaker systems are used at the same
time, determine the composite impedance as described below.
Where:
R,xRg R =total impedance
r, + r 2 R.=impedance of speaker systems
connected to “MAIN" terminals
Rz=impedance of speaker systems
connected to "REMOTE" terminals
Note:
Be sure to make this setting before switching the power “on".
- 5 -

FRONT PANEL CONTROLS AND THEIR FUNCTIONS
1 ' Power switch (power)
Before turning the power on, make sure the
volume control of this unit is set to the low
(‘‘0—*1") position.
Operation indicator (safety operation)
When the power is switched on, this indicator flashes on and off for about 5
seconds, and then illuminates steadily when the unit is in the operation
condition. If an abnormal condition in the circuitry is detected, such as DC
voltage appearing in the output, or a short-circuit of the positive (+) and
negative (-) cords from the speaker terminals, the protection circuit functions
and this indicator flashes rapidly. If this occurs, switch the power off, find the
cause of the trouble and correct it, and then switch the power on once again.
Computer-drive automatic indicator
(auto)
This indicator will illuminate when the circuity
is in the stabilized condition.
Technics Stereo Integrated Amplifier SU-V4X
power
”13 rl
computer drive safety operation
Audio muting switch (muting) •-
Set to the ''-20 dB" position when a disc is being changed or to
temporarily reduce the volume level.
(The indicator will be illuminated).
In addition, the volume level can be adjusted more precisely if
this switch is set to the “-20 dB" position for listening at a low
volume level.
i— muting
■ 1-200SI
jaofl —.on
phones
i>
speakers
mam remote
tone subsonic filter
defeat Off
rO
p
on
on
Tone controls (bass/treble) <
The bass control is for the low-frequency
sound range, and the treble control is for
the high-frequency sound range.
rec selector
I rec i
Balance control (balance)
This control is used to adjust
left/right volume balance.
• Speaker selectors (speakers)
These selectors are used to turn the speaker systems on
and off.
main:
Sound can be heard from the speakers connected to the
"MAIN" terminals.
remote:
Sound can be heard from the speakers connected to the
“REMOTE" terminals.
Note:
Before use, set the speaker impedance selector (on the
rear panel) to the correct impedance corresponding to the
impedance of the speaker systems being used. (Refer to
page 5.)
Headphones jack (phones)
* Subsonic filter switch (subsonic filter)
Set to “on" position to eliminate noise in the
low-frequency range (caused by warped discs
or motor “rumble").
• Tone switch (tone)
This switch is used to turn the tone control' circuit
(bass, treble) on or off.
defeat (-—«):
Set to this position to turn the bass/treble tone control
circuit off. Regardless of the positions of the bass/
treble tone controls the characteristics will remain
flat.
on (»--):
Set to this position for adjustment of the tone quality
with the tone controls.
- 6 -

i Loudness switch (loudness)
Set to the "on" position when listening to music at a low volume. Auditory perception of sound in the low
frequency range falls off at low volume, but when the switch is in this position, this deficiency is compensated for,
so that the full impact of the musical performance can be enjoyed.
Phono cartridge selector (phono selector)
This selector should be set to the position which corresponds to the type of cartridge used on the
turntable.
MM (-.^i):
Set to this position when using a moving-magnet type cartridge or high-output moving-coil cartridge
(1 mV or more).
MC (*-»):
Set to this position when using a moving-coil type cartridge.
jdness
phono selector
Volume control (volume)
This control is used to adjust the volume level.
Be absolutely sure to set this control to the low position ("0-»1") before turning the
power on. After the power is turned on, please wait several seconds before increasing
the volume level.
•e 1
ape
tape 2
video
/au*
CD
tuner phono
• Recording output signal indicator
This indicator indicates the sound source which can be
recorded.
• Input signal indicator
This indicator indicates the sound source of the sound being
heard from the speakers.
• Recording mode indicator (rec selector) -•Selectors (input selector/rec selector)
»Recording mode switch (rec)
This button can be used to select another program source to
listen to while recording from one tape to another tape or while
recording from some other program source.
When this button is pressed, the recording mode indicator
flashes, and, when one of the selectors is pressed, this
indicator illuminates.
If the indicator flashes, the flashing can be stopped by pressing
this switch once again.
When the recording mode indicator is not illuminated:
If one of the selectors is pressed, the sound source to be
listened to and the recording sound source will both be
switched at the same time.
Note, however, that only the sound source to be listened to will
be switched, and the tape can be monitored during recording, if
the "tape 1/DA tape" or “tape 2" selectors are pressed.
When the recording mode indicator is flashing:
If one of the selectors is pressed, only the recording sound
source will be switched.
When the recording mode indicator is illuminated:
If one of the selectors is pressed, only the sound source to be
listened to will be switched.
Press to select the sound source to be listened to and/or the
sound source to be recorded.
Note that the function of these selectors changes depending upon
the setting of the recording mode switch.
(Refer to "Recording mode switch".)
phono:
Press this button to listen to and/or record phono discs.
tuner:
Press this button to listen to and/or record radio broadcasts.
CD:
Press this button to listen to and/or record a compact disc.
video/aux:
Press this button to listen to and/or record sound from a video
cassette recorder or other equipment connected to the
“VIDEO/AUX" terminals on the rear panel,
tape 2 :
Press this button to playback, monitor, or dub the sound from
tape deck 2.
tape 1/DA tape:
Press this button to playback, monitor, or dub the sound of a
digital audio processor or other equipment connected to the
"TAPE 1/DA TAPE" terminals on the rear panel.

ENGLISH
OPERATION
Note: After listening is finished, power switches of all equip¬
ment should be turned "off”.
Power: “on” (a—-)
Select speaker systems to be used.
© Select the sound source-
phono:
Press this button to listen to phono discs.
“MM” i): for moving-magnet cartridge.-
“MC” (JL_j*): for moving-coil cartridge.-
tuner:
Press this button to listen to radio broadcasts.
CD:
Press this button to listen to a compact disc,
video/aux:
Press this button to listen to sound from a video cassette
recorder or other equipment connected to the “VIDEO/
AUX" terminals on the rear panel,
tape 2:
Press this button to playback or monitor the sound from tape
deck 2.
tape 1/DA tape:
Press this button to playback or monitor the sound of a
digital audio processor or other equipment connected to the
"TAPE 1/DA TAPE" terminals on the rear panel.
^ Follow the operating
instructions for the
equipment connected.
9 Adjust the volume level.
Technics 5te*eo wogrutaelAmeaf*. SU-V4X
/T\
P. Ei
CO ura> | c'o'o
■ ~i
Headphones
(option)
If sound from speakers is not wanted,
set the speaker selectors to the off
position.
Note: Set volume control to minimum
("0") position before connecting head¬
phones.
Adjust tone quality as desired. Low-d
range sound is adjusted with bass
control ("bass"), and high-range sound
with treble control ("treble").
■ Steps required for all operations
(Follow these steps, as necessary, for all operations after
adjusting of volume level.)
i Set to “on" (i_ m.) position when listening at a low volume level.
kSet to the "-20 dB" position to temporarily reduce the volume level.
(The indicator will be illuminated).
> Adjust left/right volume balance.
While listening to an AM broadcast or a monaural FM broadcast, balance the
sound so that it seems to be heard from the center, between the speakers.
Adjust to desired tone quality. If set to “defeat"
position, tone controls have no effect, and
frequency response becomes flat.
i Set to the "on" position to eliminate ultra-low-frequency noise (to eliminate
turntable motor "rumble", etc.).
- 8 -

RECORDING
A Power: "on” (*-«)
Select speaker systems to be used.
A Press.
| (The recording mode indicator will flash.)
A Select the sound source for recording.
(The recording mode indicator and recording output signal
indicator will illuminate.)
• Press this button in order to record from the tape deck
I connected to the "TAPE 1/DA TAPE" terminals (on the rear
1 panel) to the tape deck connected to the "TAPE 2" terminals.
| fPress this button in order to record from the tape deck
| (connected to the "TAPE 2" terminals (on the rear panel) to
| | the tape deck connected to the “TAPE 1/DA TAPE" ter-
I I minals.
(0 Operation of tape deck
By using the controls on the tape deck,
adjust the recording level. Then begin
recording.
Note:
1. Recording mode switch
When the recording mode switch is pressed two times, the
illumination of the recording mode indicator will stop. Note that
the recording sound source will be changed, interrupting the
recording, if this is done while a recording is being made.
(Refer to page 7.)
2. Timer recordings
Note that the recording might not be made if a timer recording is
made while the recording mode indicator is flashing.
Be sure to check to be sure that the recording mode indicator is
illuminated steadily (not flashing).
Select the desired sound source to be heard.
(The input signal indicator will illuminate.)
• If the sound source which is being recorded from
is selected:
The sound can be heard immediately before it is
recorded.
• If the tape deck making the recording is selected:
The sound can be heard immediately after it is
recorded.
• If some other sound source is selected:
The sound of the selected source can be heard. (This
will not affect the recording which is being made.)
To record a different sound source
Follow steps (3) through (6).

TECHNICAL SPECIFICATIONS
(DIN 45 500)
■ AMPLIFIER SECTION
1 kHz continuous power output
both channels driven
20 Hz—20 kHz continuous power output
both channels driven
Total harmonic distortion
rated power at 20 Hz~20 kHz
rated power at 1 kHz
half power at 20 Hz—20 kHz
half power at 1 kHz
Intermodulation distortion
rated power at 250 Hz: 8 kHz=4:1,8Q
rated power at 60 Hz: 7 kHz=4:1, SMPTE, 80
Power bandwidth
2x70 W (40)
2x70 W (80)
2x65 W (40)
2x65 W (80)
0.03% (40)
0.004% (80)
0.007% (40)
0.003% (80)
0.003% (80)
0.001% (80)
0.03%
0.004%
both channels driven, -3 dB 5 Hz-50 kHz (40,0.03%)
5 Hz—60 kHz (80, 0.02%)
Residual hum and noise 0.9 mV
Damping factor
input sensitivity and impedance
PHONO MM
MC
TUNER, CD, VIDEO/AUX
TAPE 1/DA TAPE, TAPE 2
PHONO maximum input voltage (1 kHz, RMS)
MM
MC
S/N
30 (40), 60 (80)
2.5 mV/47 kO
170 pV/220O
150 mV/22 kO
150 mV/22 kO
160 mV
12 mV
rated power (40)
PHONO MM 76 dB (IHF, A: 86 dB, input 2.5 mV)
MC 64 dB (IHF, A: 68 dB, input 250 pV)
TUNER, CD, VIDEO/AUX,
TAPE 1/DA TAPE, TAPE 2 91 dB (IHF, A: 102 dB)
Frequency response
PHONO RIAA standard curve
TUNER, CD, VIDEO/AUX,
TAPE 1/DA TAPE, TAPE 2
Tone controls
BASS
TREBLE
Muting
Subsonic filter
±0.8 dB (30 Hz—15 kHz)
5 Hz—120 kHz (-3 dB)
+0, -0.2 dB (20 Hz-20 kHz)
50 Hz, +10 dB—10dB
20 kHz, +10 dB—10 dB
-20 dB
30 Hz, -6dB/oct.
Loudness control (volume at -30 dB) 50 Hz, +9 dB
Output voltage
RECOUT 150 mV
Channel balance, VIDEO/AUX 250 Hz-6,300 Hz +1 dB
Channel separation, VIDEO/AUX 1kHz 60 dB
Headphones output level and impedance 540 mV/330Q
Load impedance
MAIN or REMOTE 40-160
MAIN and REMOTE 80-160
■ GENERAL
Power consumption 390 W
Power supply
For United Kingdom
AC 50 Hz/60 Hz, 110 V/120 V/220 V/240 V
For continental Europe AC 50 Hz/60 Hz, 220 V
For others AC 50 Hz/60 Hz, 110 V/120 V/220 V/240 V
Dimensions (WxHxD) 430x97x290 mm
(16-15/16" x3-27/32" x 11 -7/16")
Weight 6.7 kg
(14.81b.)
Note:
Total harmonic distortion is measured by the digital spectrum ana¬
lyzer (H.P. 3045 system).
Specifications subject to change without notice.
PROTECTION CIRCUITRY
The protection circuitry 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 this unit is used.
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.
-10

TROUBLESHOOTING GUIDE
Before requesting service for this unit, check this table to deter¬
mine if the problem can be solved as described below. If the
problem still persists after making these checks, or if there are
symptoms of malfunction not described in this table, it is recom¬
mended that you consult the store where this unit was purchased
or your local Service Center (see list included) for further infor¬
mation and assistance.
Problem Probable cause(s)
Suggested remedy
Problems
noted
at
all
times
No sound Is heard when
the power Is turned on.
The power cord plug is not completely inserted. •Confirm that the power cord plug is connected
completely.
The power supply fuse has failed.
• Request the store where this unit was purchased, or
a Service Center, to replace the fuse.
Connections are incomplete or incorrect to the
speaker systems, etc.
• Check to be sure that all connection wires are
correctly connected.
The setting of the selectors has not been
completely or correctly made.
• Check to be sure that the selectors are set to the
correct position.
The speaker selectors are incorrectly set to the
"off" position.
• Set to the "on" position.
When listening to stereo
sound, the sound of
the various musical
instruments Is not heard
from its correct
position.
The positive (+) and negative (-) connections
of the speaker connection wires are reversed.
• Reconnect the speaker connection wires so that the
positive and negative connections are correct.
When listening to stereo
sound, the left and right
sounds are reversed.
The left and right connections of the speaker
connection wires are reversed.
• Check the speaker connection wires and connect
them correctly if necessary.
The left and right connections of the connec¬
tion wires connected to other equipment are
reversed.
• Check the connection wires to other equipment
and connect them correctly if necessary.
A low-pitched noise
("hum" or “buzz") Is
heard.
The power cord or a fluorescent light, etc.,
is near the connection wires.
•Try separating this unit from the electric appliance
as far as possible.
• Reverse the connection of the power cord plug.
The connection of the ground wire is incorrect
or incomplete.
•Check to be sure that the grounding connection is
correct.
• If the unit is not grounded, try doing so.
Sound Is not heard from
the speaker system on
one side.
The speaker connection wires are disconr
nected.
• Check and correct the connections of the speaker
connection wires.
The balance control is not set to the center
position.
• Set the mark on the balance control to the center
position.
The volume level for a
radio broadcast Is dif¬
ferent from that for
disc play.
The strength of the broadcast signal is not the
same as the output from the turntable.
• Adjust the volume level by using the volume control.
While listening, sound is
suddenly no longer
heard.
(Indication lamps of
other equipment are still
illuminated.)
The protection circuitry of the amplifier has
functioned.
• Check the connections to other equipment
(especially the speaker connection terminals, etc.),
and, if still no sound is heard, request service from
the store where the unit was purchased or from your
local Service Center.
During
disc
play
The sound lacks
clarity and volume.
The cartridge selector is incorrectly set to the
"MM" position when a moving-coil type
cartridge is being used.
•Set the catridge selector to the "MC” position.
The high-frequency
range cannot be
clearly heard.
The cartridge selector is incorrectly set to the
"MC” position when a moving-magnet type
catridge is being used.
•Set the catridge selector to the “MM" position.
- 11 -