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Technics SU-810 Service Manual

Technics SU-810
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SU-81
■
CONTENTS
Page
BEFORE
REPAIR
.
2
PROTECTION
CIRCUITRY
.
2
ACCESSORY
.
2
LOCATION
OF
CONTROLS.
3
CONNECTIONS.4,
5
DISASSEMBLY
INSTRUCTIONS
.
6~8
BLOCK
DIAGRAM
.
9
Page
SCHEMATIC
DIAGRAM
.
10-12
PRINTED
CIRCUIT
BOARDS
AND
WIRING
CONNECTION
DIAGRAM.
13-15
TERMINAL
GUIDE
OF
IC’S,
TRANSISTORS
AND
DIODES
..
16
REPLACEMENT
PARTS
LIST.
17,18,
21
EXPLODED
VIEW
.19,20
■
BEFORE
REPAIR
(1)
Turn
off
the
power
supply.
Using
a
10Q,
5
W
resistor
connect
both
ends
of
power
supply
capacitors
(C705,
C706,
6800
pF)
in
order
to
discharge
the
voltage.
(2)
Before
turning
the
power
supply
on,
after
completion
of
repair,
slowly
apply
the
primary
voltage
by
using
a
power
supply
voltage
controller
to
make
sure
that
the
consumed
current
at
50
Hz/60
Hz
in
NO
SIGNAL
mode
should
be
shown
below
with
respect
to
supply
voltage
220
V/240
V.
Power
supply
voltage
AC
220
V
AC
240
V
Consumed
current
50
Hz
60-240
mA
55-220
mA
Consumed
current
60
Hz
56-227
mA
52-208
mA
■
PROTECTION
CIRCUITRY
The
protection
circuitry
may
have
operated
if
either
of
the
following
conditions
is
noticed:
*No
sound
is
heard
when
the
power
is
switched
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
are
used.
If
this
occurs,
follow
the
procedure
outlined
below;
1.
Switch
OFF
the
power.
2.
Determine
the
cause
of
the
problem
and
correct
It.
3.
Switch
ON
the
power
once
again.
Note:
When
the
protection
circuitry
functions,
the
unit
will
not
operate
unless
the
power
is
first
switched
OFF
and
then
ON
again.
■
ACCESSORY
•AC
power
supply
cord
..
1
Configuration
of
AC
power
supply
cord
differs
according
to
area.
SJA193
(1.5
m).For
(EB)
area
only.
SFDAC05E03
(1.5
m)
F
or
others.
-
2
-

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Technics SU-810 Specifications

General IconGeneral
Input Sensitivity2.5mV (MM), 150mV (line)
Signal to Noise Ratio76dB (MM), 90dB (line)
Output150mV (line)
Weight8.5 kg
Power Output45 watts per channel into 8Ω (stereo)
Channel Separation55dB (1kHz)
Speaker Load Impedance4Ω - 16Ω
Dimensions430 x 135 x 290 mm
TypeStereo Integrated Amplifier

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