Technics SX-PR100 Service Manual

PRECAUTIONS BEFORE SERVICING
@ Precautions for measuring of the output waveforms.
1. Please set the INITIAL mode before measurement.
e
INITIAL
mode:
Press
the
FSC
button
to
turn
it
on,
and
then
press
the
INITIAL
key
on
the
keyboard.
2. After INITIAL mode, set the measurement conditions as each check points.
3. The waveform was measured by ‘National Digital Storage Oscilloscope VP-5730A”. Therefore the waveforms
of musical tone signals shown may somewhat change due to variation of timing of measure.
4. The voltage shown in the photo is 1/10 of the actual value. However, the actual voltage is 10 times of as shown
in this photo.
5. The tone signal output varies with the level of key pressing force.
In this measurement, the waveform obtained with maximum key pressing force is shown.
However, the output level and waveform may very, depending on the timing and measuring instrument and other
conditions in the measurement.
important safety notice:
Components identified by /\ mark have special characteristics important for safety.
When replacing any of these components, use only manufacturer’s specified parts.
@ Symbolic Marks
The symbolic marks for resistors and capacitors, which are used in the circuits for this Piano, are as shown in
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.
(TABLE-1)
SYMBOL
SPECIFICATION
SYMBOL
SPECIFICATION
®
Fixed
Carbon
Film
Resistors
®
Fixed
Metal
Film
Resistors
|
“FLAME-PROOF”
(ERD—F—type)
“FLAME-PROOF”
(ERX—type)
Fixed
Wire
Wound
Resistors
Fuse
Type
Fixed
Metal
Oxide
Film
“FLAME-PROOF”
(ERF—type)
Resistors “FLAME-PROOF”
Fixed
Metal
Oxide
Film
Resistors
Fuse
Type
Fixed
Carbon
Film
Resistors
“FLAME-PROOF”
(ERG—type)
“FLAME-PROOF”
(ERD2FC—type)
(ERQ—type)
aa
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% Tolerance)
(TABLE-2)
SYMBOL
SPECIFICATION
TYPE
|
@
-
|
Non-Polarised
Electrolytic
Capacitors
ECEA—N—type
2
Oo
Non-Polarised
Electrolytic
(for
Network
System)
ECEA—Y—type
|
®
|
Aluminum
Electrolytic
Capacitors
(Miniature
type)
ah
opal
ae
te
S)
Aluminum
Electrolytic
Capacitors
(Low
leakage
current
type)
ECEA—M—type
|
oO
|
Temprature
Compensating
Ceramic
Capacitors
ECC—type
>.
1
High-Dielectric
Constant
Ceramic
Capacitors
ECK—type
aaa
Metalized
Polyester
Film
Capacitors
for
Across
the
Line
ECQ—EW—type
are
Aluminum
Electrolytic
Capacitors
for
smooting
Circuit
ECES—type

Technics SX-PR100 Specifications

General

Brand	Technics
Model	SX-PR100
Category	Musical Instrument
Language	English