Yamaha Silent Cello SVC210 Instrukcja serwisowa - Strona 14
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SVC210
I
INSPECTIONS
1.
Preparations
1-1
Unit Setting
Unless otherwise specified, the controls and switches are to be set as follows.
AUX VR
VOLUME
POWER switch
REVERB switch
The [PHONES] and [LINE OUT] terminals are to be terminated with the following resistors.
PHONES
LINE OUT
1-2
Measuring instruments and jigs
The following measuring instruments and jigs are used for inspection.
Measuring instruments : low-freqency oscillator, level meter.
Jigs
2.
Inspections
Items
Output level 1
PHONES (L)
PHONES L
PHONES (R)
Output level 2
PHONES (L)
PHONES R
PHONES (R)
Output level 3
LINE OUT (L)
LINE OUT L
LINE OUT (R) : Less than -60 dBu
Output level 4
LINE OUT (L)
LINE OUT (R) : -3.5 ±2 dBu
LINE OUT R
Output level 5
PHONES (L/R) : -22.0 ±2 dBu
PICKUP INPUT
(1 kHz)
Output level 6
PHONES (L/R) : -20.0 ±2 dBu
PICKUP INPUT
(12 kHz)
Output level 7
PHONES (L/R) : -26.0 ±2 dBu
PICKUP INPUT
(230 Hz)
Output level 8
PHONES (L/R) : -22.0 ±2 dBu
PICKUP INPUT
(120 Hz)
Output level 9
PHONES (L/R) : -20.0 ±2 dBu
PICKUP INPUT
(60 Hz)
Noise level
PHONES (L/R) : Less than -60 dBu
PHONES (L/R)
Noise level
LINE OUT (L/R) : Less than -60 dBu
LINE OUT (L/R)
Noise level
LINE OUT (L/R) : Less than -60 dBu
LINE OUT (L/R)
* Check by the sense of hearing.
RM (ROOM)
REVERB MODE
HL1 (HALL1)
HL2 (HALL2)
14
: Maximum
: Maximum
: ON (REV OFF mode)
: RM
: 150 ohms
: 10 k-ohms
* Terminate the output terminals of the low-frequency oscillator with the 600 ohms resistor.
* Use a flat filter when measuring the noise level.
: AC adaptor (PA-3C), powered speaker, stereo sound source (such as a CD player), headphones.
Specification
: -4.5 ±2 dBu
: Less than -60 dBu
: -60 dBu or less
: -4.5 ±2 dBu
: -3.5 ±2 dBu
: Less than -60 dBu
: Reverberation time 1.5 sec.
: Reverberation time 1.5 sec.
: Reverberation time 2.0 sec.
Applied signal and settings
AUX IN L : -20 dBu/1 kHz,
sine wave
Apply ground to the
AUX IN R : -20 dBu/1 kHz,
CN1 1st pin of the
sine wave
MA circuit board.
AUX IN L : -20 dBu/1 kHz,
(Connect pin 1 and
sine wave
pin 2.)
AUX IN R : -20 dBu/1 kHz,
sine wave
Apply a 1 kHz -30 dBu sine wave signal to the
CN1 1st pin of the MA circuit board.
Apply a 12 kHz -30 dBu sine wave signal to the
CN1 1st pin of the MA circuit board.
Apply a 230 Hz -30 dBu sine wave signal to the
CN1 1st pin of the MA circuit board.
Apply a 120 Hz -30 dBu sine wave signal to the
CN1 1st pin of the MA circuit board.
Apply a 60 Hz -20 dBu sine wave signal to the
CN1 1st pin of the MA circuit board.
Apply ground to the CN1 1st pin of the MA cir-
cuit board.
(Connect pin 1 and pin 2.)
Play the strings using the fingers, then stop the
vibration of the strings and check the reverbera-
tions.
[
0 dBu=0.775 Vrms
Set the unit as specified in 1-1
POWER SW
: ON (Reverb off)
REVERB SW : RM
POWER SW
: REV.ON
REVERB SW : RM
Set the unit as specified in 1-1 and
the [POWER] switch to the [REV.ON]
position; set the [REVERB] switch to
the appropriate position.
]