Boss GT-100 Service Notes page 18

Mar. 2012
8. EXTERNAL EXP
1.
Depress the heel of the EV-5, and verify that the message MIN: OK
appears on the left screen.
2.
Depress the toe of the EV-5, and verify that the message MAX: OK
appears on the right screen.
3.
Detach the EV-5.
Execution automatically advances to the next test item.
9. AMP CONTROL
1.
Connect the dummy plug (1/4-inch mono phone plug) to the AMP CTL
connector.
2.
Set the tester to the resistance-measurement mode, and touch the + and -
probes respectively to the tip and ground connectors of the dummy plug.
3.
Following the indications displayed on the LCD screen, verify that the
values shown below are displayed for the resistances.
LCD screen display
OPEN
SHORT
4.
Press PAGE .
Execution advances to the next test item.
10. AUDIO
INPUT -> OUTPUT L/MONO and R (-10 dB Mode)
Signal Levels
INPUT -> PHONES L and R (-10 dB Mode) Signal
Levels
fig.audio-1.eps
(AFAD: ON)
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: 6.5 Vpp–7.5 Vpp
OUTPUT R: 6.5 Vpp–7.5 Vpp
fig.osc-1.eps
18
Resistance
Infinity
Approx. 0 Ω
3.
Connect the oscilloscope to the PHONES connector, and verify that the
output values are as shown below.
PHONES L: 6.5 Vpp–7.5 Vpp
PHONES R:
6.5 Vpp–7.5 Vpp
fig.osc-2.eps
4.
Press PAGE .
A screen like the one shown below is displayed.
fig.audio-2.eps
(AFAD: HI)
5.
Input the following signal to the INPUT connector.
200-Hz sine wave at -16 dBm
6.
Connect the oscilloscope to the OUTPUT L/MONO and R connectors, and
verify that the output values are as shown below.
OUTPUT L/MONO: 5.4 Vpp–6.0 Vpp
OUTPUT R: 5.4 Vpp–6.0 Vpp
fig.osc-3.eps
7.
Press PAGE twice.
A screen like the one shown below is displayed.
fig.audio-1.eps
GT-100