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