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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)
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)
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