Technics SU-V90D Service Manual

m LOCATION OF CONTROLS
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Power switch (power)
[2] Speaker selectors (speakers)
These selectors are used to turn the speaker systems on and
off.
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Operation indicator (operation)
This indicator illuminates approximately 5 seconds after the
power is switched ON, indicating that this unit is in the opera-
tional condition. If there is any abnormal condition of the out-
put signals to the speaker systems (such as, for example, a
short-circuit of the speaker connection wires, etc.), this abnor-
mal condition will be detected, the protection circuitry will
function, and this indicator will stop illumination.
[4] Sampling frequency indicators
(sampling frequency)
These indicators function to illuminate to indicate the detec-
tion of the sampling frequency of the digital signals input to the
“DIGITAL INPUT” terminals on the rear panel of this unit.
(Ilumination occurs when digital signals are received, even a
digital component is not in the play mode.)
32 kHz: For digital signals with the sampling frequency of
32 kHz mode
44.1 kHz: CD and others
48 kHz: For digital signals with the sampling frequency of
48 kHz mode
[5] Audio muting switch (muting)
Set to the ‘‘—20 dB” position when a disc is being changed or
to temporarily reduce the volume level (approx. 1/10).
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Loudness switch (loudness)
Set to the ‘on’ position when listening to music at low
volume. Auditory perception of sound in the tow frequency
range falls off at low volume, but when the switch is in this posi-
tion, this deficiency is compensated for, so that the full impact
of the musical performance can be enjoyed.
7| Digital input selector (digital input)
This selector is used when a component connected to one of
the “DIGITAL INPUT” terminals (on the rear panel of this unit)
is to be used as the sound source.
Power amplifier direct switch/indicator
(power amp direct)
When this switch is switched ON (Indicator will illuminate.), a
superior level of tone quality can be obtained, because the
signals from the component connected to the “POWER AMP
DIRECT” terminals or the “DIGITAL INPUT” terminals are
sent directly to the sound volume, without passing through the
tone control circuit, etc. of this unit.
[9] Digital/analog selector/indicators
(digital/analog)
This selector is used (when the is ON) to
select, as the signal source, either the component connected
to the “DIGITAL INPUT” terminals or the component con-
nected to the “POWER AMP DIRECT” terminals.
One of the indicators will indicate which source is selected.
Block diagram
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Phono cartridge
Ti] selector selector
ANALOG
INPUT
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Class
AA
Mutin:
PHONOO
EQ
amp.
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Input/
switch
TUNERO
recording-
CDO
source
AUX
selectors
TAPE
10-———
TAPE
2/DATO
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REC
OUT
ess
TAPE
1°
TAPE
2/DATO
Rec out
selector
Selector control
POWER AMP.
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DIGITAL INPUT (2) Class AA To each circuit To each circuit
OPTICAL O Digital input ~ buffer
&) selector DIA amp.
COAXIAL O converter Power Amp Direct 8]
digital/analog
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Power switch
Active
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power supply
Power
Tone control
, amp.
switch
(x)
Main
direct switch
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[18]
Speaker/
out
Tone
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muting circuit Remote
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Speaker Bit
selector
Volume Balance 16]
control control
(10) Volume control/indicator (volume)
There are two types of volume scale indications: one for when
the [power amp direct! is OFF, and one for when it is ON
(Indicator will illuminate.).
11] 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 (=— &): Set to this position when using a moving-magnet
type cartridge or high-output moving-coil car-
tridge (1 mV or more).
MC (g— =): Set to this position when using a moving-coil
type cartridge.
12} Recording output signal indicators
(recording selector)
These indicators-indicate the sound source which can be
recorded.
3] Input signal indicators (input selector)
These indicators indicate the sound source of the sound being
heard from the speakers.
14] Input/recording-source selectors
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 selector.
(Refer to ‘‘Recording-mode selector/indicator”’.)
15] Recording-mode selector/indicator (rec mode)
This selector is used to select the signal to be recorded by the
connected tape deck.
When this selector is pressed, the indicator flashes ON and
OFF repeatedly; when one of the input/recording-source selec-
tor is then pressed, this indicator changes from flashing to a
steady illumination.
If this selector is pressed while one of the recording output
signal indicators is illuminated, the recording-mode indicator
will change from a steady illumination to repeated flashing;
when it is pressed once again, the indicator will be extinguish-
ed.
When the recording-mode indicator is not illuminated:
If one of the input/recording-source selectors is pressed, the
sound source to be listened to and the recording sound source
will both be switched at the same time.
When the recording-mode indicator is flashing:
If one of the input/recording-source selectors is pressed, only
the recording sound source will be switched.
When the recording-mode indicator is illuminated:
{f one of the input/recording-source selectors is pressed, only
‘ the sound source to be listened to will be switched.
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Balance control (balance)
This control is used to adjust left/right volume balance.
17] Tone control switch (tone control)
Set this switch to the “on” position if you want to adjust
the |bass] or |treble| tone quality.
18} 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.
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Headphones jack (phones)
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Technics SU-V90D Specifications

General

Brand	Technics
Model	SU-V90D
Category	Amplifier
Language	English