Boss GT-100 Service Notes page 19

Mar. 2012
AUX IN -> OUTPUT L/MONO and R (-10 dB Mode)
Signal Levels
1.
Connect the signal generator to the AUX IN connector, and input the
following signal.
INPUT: 200-Hz sine wave at +10 dBm
2.
Connect the oscilloscope to the OUTPUT L/MONO and R connectors, and
verify that the output values are as shown below.
OUTPUT L/MONO: 6.5 Vpp–7.5 Vpp
OUTPUT R: 6.5 Vpp–7.5 Vpp
fig.osc-4.eps
3.
Detach the signal generator from the AUX IN connector.
AUX IN -> OUTPUT L/MONO and R (-10 dB Mode)
Residual Noise
AUX IN -> PHONES L and R (-10 dB Mode) Residual
Noise
1.
Connect the miniature stereo phone plug equipped with 1-kΩ load
resistors to the AUX IN connector.
2.
Connect the noise meter to the OUTPUT L/MONO and R connectors, and
verify that residual noise is as shown below.
OUTPUT L/MONO: -90.0 dBm or lower (DIN audio)
or -92.0 dBm or lower (JIS A)
OUTPUT R: -90.0 dBm or lower (DIN audio)
or -92.0 dBm or lower (JIS A)
3.
In the same way, verify that the residual noise at the PHONES connector
is as shown below.
PHONES L: -88.0 dBm or lower (DIN audio)
or -90.0 dBm or lower (JIS A)
PHONES R: -88.0 dBm or lower (DIN audio)
or -90.0 dBm or lower (JIS A)
INPUT -> OUTPUT L/MONO and R (+4 dB Mode)
Signal Levels
1.
Depress CTL/EXP.
A screen like the one shown below is displayed.
fig.audio-3.eps
(+4 dB)
1.
Connect the signal generator to the INPUT connector, and input the
following signal.
INPUT: 200-Hz sine wave at +10 dBm
2.
Connect the oscilloscope to the OUTPUT L/MONO and R connectors, and
verify that the output values are as shown below.
OUTPUT L/MONO: 16.8 Vpp–18.0 Vpp
OUTPUT R: 16.8 Vpp–18.0 Vpp
3.
Depress CTL/EXP.
A screen like the one shown below is displayed.
fig.audio-1.eps
(AFAD: ON)
INPUT -> OUTPUT L/MONO and R (-10 dB Mode)
Mute Operation
INPUT -> PHONES L and R (-10 dB Mode) Mute
Operation
1.
Press WRITE.
A screen like the one shown below is displayed.
fig.audio-4.eps
(MUTE ON)
2.
Input the following signal to the INPUT connector.
INPUT: 200-Hz sine wave at +10 dBm
3.
Verify that output signals from the OUTPUT L/MONO and R connectors
disappear.
fig.osc-6.eps
4.
Press WRITE.
A screen like the one shown below is displayed.
fig.audio-1.eps
(AFAD: ON)
GT-100
19