Technics SX-PX107

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PRECAUTIONS
BEFORE
SERVICING
MEMO
4
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M@ 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
1-12,
No.
4).The
WAVE
ROM
output
will
then
be
output
as
a
sine
wave
to
facilitate
the
SOPVICENG
CHECK,
<=
8
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ETT
SSIS
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Components
identified
by
a
/A\
mark
have
special
characteristics
important
for
safety.
ee
We
When
replacing
any
of
these
components,
use
only
manufacturer's
specified
parts.
M@ Symbolic Marks
The
symbolic
marks
for
resistors
and
capacitors
which
used
in
this
circuits
are
classified
as
following
TABLE-1
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and
TABLE-2.
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PRE
SOGE
TPR
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=
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.
(TABLE-1)
SYMBOL
SPECIFICATION
SYMBOL
SPECIFICATION
®
Fixed
Carbon
Film
Resistors
:
®
Fixed
Metal
Film
Resistors
“FLAME-PROOF”
(ERD—F—type)
“FLAME-PROOF”
(ERX—type)
Fuse Type Fixed Metal Oxide Film
Fixed
Wire
Wound
Resistors
P
‘i
i.
“FLAME-PROOF”
(ERF
—type)
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Seen
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te
Fixed
Metal
Oxide
Film
Resistors
Fuse
Type
Fixed
Carbon
Film
Resistors
‘““FLAME-PROOF”
(ERG—type)
Bcd
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Fixed
Metal
Film
Resistors
(Precision
and
High
Stability)
(ERO—type)
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
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Rees
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oe
eos
gu’
W® Non-Polarized Electrolytic Capacitors ECEA__KN__type
Y) Non-Polarized Electrolytic (for Network System) ECEA__Y__type
1) Tantalum Solid Electrolytic Capacitors ECS__type
Metalized Plastic Film Capacitors (TF Series) ECQV__type
Temperature
Compensating
Ceramic
Capacitors
SO
Re
a
ae
aw
Sag
a
ala
ee
ag
O High-Dielectric Constant Ceramic Capacitors ECK__type
sR
ec
a
ar
tes
sel
Ne
nel
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Axial Lead Ceramic Capacitors ECB__type
ECQ__EW_type
ECES__type
ECUV__type
Metalized Polyester Film Capacitors for Across the Line
y p.
Aluminum Electrolytic Capacitors for Smoothing Circuit
Multilayer Ceramic Chip Capacitors