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Technics SX-PR270 M User Manual

Technics SX-PR270 M
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PRECAUTIONS
BEFORE
SERVICING
@
Precautions
for
measuring
of
the
output
waveforms.
1.
The
waveform
was
measured
with
a
“National
Digital
Storage
Oscilloscope
VP-5730A’.
Therefore
the
waveforms
of
musical
tone
signals
shown
may
differ
somewhat
due
to
the
difference
in
the
timing
of
triggering.
2.
Since
the
1/10
test
probe
is
used,
the
indicated
voltage
value
on
the
bottom
part
of
each
waveform
photo
is
1/10
of
the
actual
value
(e.g.
0.2V/cm
should
be
2.0V/cm).
3.
To
measure
the
waveforms,
first
set
this unit
to
the
self-diagnostic
mode
(refer
to
page
I-15,
No.
4).
The
WAVE
ROM
output
will
then
be
output
as
a
sine
wave
to
facilitate
the
servicing
check.
i
Important
safety
notice:
Components
identified
by
a
/\
mark
have
special
characteristics
important
for
safety.
When
replacing
any
of
these
components,
use
only
manufacturer's
specified
parts.
i
Symbolic
Marks
The
symbolic
marks
for
resistors
and
capacitors
which
used
in
this
circuits
are
classified
as
following
TABLE-1
and
TABLE-2.
1,
RESISTORS
¢
Resistors
without
symbolic
mark
are
FIXED
CARBON
FILM
RESISTORS
(ERD-type).
*All
resistors
are
1/4WATT,
+5%
TOLERANCE
unless
otherwise
designated
in
the
schematic
diagrams.
|
©”
Fixed Metal
Film
Resistors
““FLAME-PROOF”
(ERX—type)
Fuse
Type
Fixed
Metal
Oxide
Film
““FLAME-PROOF”
(ERF—type)
3)
Resistors
“FLAME-PROOF”
®
Fixed
Metal
Oxide
Film
Resistors
Fuse
Type
Fixed
Carbon
Film
Resistors
|
‘“‘FLAME-PROOF”
(ERG—type)
‘“‘“FLAME-PROOF”
(ERD2FC—type)
(ERQ—type)
Fixed
Metal
Film
Resistors
(Precision
and
High
Stability)
(ERO—type)
(TABLE-1)
SYMBOL
SPECIFICATION
®
Fixed
Carbon
Film
Resistors
““FLAME-PROOF”
(ERD—F—type)
@
Fixed
Wire
Wound
Resistors
2.
CAPACITORS
*
Capacitors
without
symbolic
mark
are
POLYESTER
CAPACITORS.
(ECQM-type,
ECQG-type,
+10%
Tolerance)
*
Polarized
capacitors
without
symbolic
mark
are
Aluminum
Electrolytic
Capacitors.
(ECEA—type,
+20%
Tolernace)
(TABLE-2)
SYMBOL
SPECIFICATION
TYPE
ECEA_.KN__type
AN)
Non-Polarized
Electrolytic
Capacitors
Non-Polarized
Electrolytic
(for
Network
System)
ECEA__Y__type
Aluminum
Electrolytic
Capacitors
(Low
leakage
current
type)
|
ECEA__M__type
Aluminum
Electrolytic
Capacitors
(Low
impedance
type)
ECEA__Z__type
Tantalum
Solid
Electrolytic
Capacitors
ECS__type
Metalized
Plastic
Film
Capacitors
(TF
Series)
ECQV__type
Y
WS)
oa)
®
CTE)
Polyester
Film
Capacitors
ECQB__type
Temperature
Compensating
Ceramic
Capacitors
ECC__type
High-Dielectric
Constant
Ceramic
Capacitors
ECK__type
ECR__type
Ceramic
Capacitors
(Cylinder
type)
+4
ECBA__type
Metalized
Polyester
Film
Capacitors
for
Across
the
Line
ECQ__EW__type
4.
Aluminum
Electrolytic
Capacitors
for
Smoothing
Circuit
Multilayer
Ceramic
Chip
Capacitors
ECES__type
ECUV__type

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Technics SX-PR270 M Specifications

General IconGeneral
BrandTechnics
ModelSX-PR270 M
CategoryMusical Instrument
LanguageEnglish

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