Roland BOSS RT-20 Service Notes page 15

Dec. 2005
5. Expression Pedal Check
1.
Press the right pedal to start the Expression Pedal Check.
fig.05-EXP-panel
2.
Connect an EV-5 to the SPEED (EXP PEDAL) jack.
3.
Set the MIN knob of the EV-5 to 0.
4.
Press down the pedal of the EV-5 to the heel side.
5.
Confirm the red LED at the position of 12 o'clock in the Virtual Rotor
Display lights.
fig.05-EXP-1
6.
Press down the pedal of the EV-5 to the toe side slowly.
7.
Confirm the lighting position of the red LED in the Virtual Rotor Display
moves to 12, 3, 6 and 9 o'clock.
8.
Press down the pedal of the EV-5 to the heel side slowly.
9.
Confirm the lighting position of the red LED in the Virtual Rotor Display
moves to 9, 6, 3 and 12 o'clock.
fig.05-EXP-2
10. Remove the EV-5 from the SPEED (EXP PEDAL) jack.
11. Confirm the red LED in the Virtual Rotor Display turns off.
6. Analog Bypass Waveform Check
1.
Press the right pedal to start the Analog Bypass Waveform Check.
fig.06-ANABYP-panel
2.
Connect an oscilloscope to OUTPUT A (MONO) and OUTPUT B.
3.
Connect an oscillator to INPUT A (MONO), and input a rectangular wave
of 200 Hz/500 mV p-p.
4.
Confirm the output waveform will be like the following picture.
fig.06-ANABYP-1_70(200 mV/DIV, 1 ms/DIV)
200mV/DIV, 1ms/DIV
<< 200Hz, 500 mV p-p +/-40 mV p-p >>
5.
Hold the signal to INPUT A (MONO), and insert a 47-kΩ short plug to
INPUT B.
6.
Confirm the output waveform will be like the following picture.
fig.06-ANABYP-2_70(200 mV/DIV, 1 ms/DIV)
200mV/DIV, 1ms/DIV
<< 200Hz, 500 mV p-p +/-40 mV p-p >>
7.
Remove plugs of INPUT A (MONO) and INPUT B, and then input a
rectangular wave of 200 Hz/500 mV p-p to INPUT B only.
RT-20
15