Technics SU-G50 User Manual

SU-G50
m@ CONTENTS
Page Page
BEFORE
REPAIR:
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SCHEMATIC
DIAGRAM
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13~18
PROTECTION
CIRCUITRY
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PRINTED
CIRCUIT
BOARDS
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19~22
ACCESSORIES
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TERMINAL
GUIDE
OF
IC’S,
LOCATION
OF
CONTROLS
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3,4
TRANSISTORS
AND
DIODES
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CONNECTIONS
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4~6
WIRING
CONNECTION
DIAGRAM
............-2.-0
200s
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23
DISASSEMBLY
INSTRUCTIONS
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7~9
REPLACEMENT
PARTS
LIST
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24~28
DESCRIPTION
OF
FLPANEL
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-
EXPLODED
VIEW
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BLOCK DIAGRAM .............0 0c cece cece eee e teenies 11,12
m@ BEFORE REPAIR
(1)
Turn
off
the
power
supply.
Using
a
10,
5
W
resistor
connect
both
ends
of
power
supply
capacitors
(C701,
C702,
10000
LF)
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 110 V/127 V/220 V/240 V.
Power
supply
voltage
AC
110
V
AC
127V
AC
220
V
AC
240
V
Consumed
current
50
Hz
260~510
mA
300~550
mA
100~400
mA
80~330
mA
Consumed
current
60
Hz
208~408
mA
240~440
mA
80~320
mA
64~264
mA
m
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.
m@
ACCESSORIES
¢ AC power supply cord
(SJA173)...For (GN) area only.
(RJA0004)...For others.
@AC attachment plug
(SJP9215)...For (GC), (PX) areas.
Configuration
of
AC
power
supply
cord
differs
according
to area.
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Technics SU-G50 Specifications

General

Brand	Technics
Model	SU-G50
Category	Amplifier
Language	English