Roland Boss ME-50 Service Notes page 14

[PEDAL MODE SW] = "0"--"5"
fig.test-10_50
1
2
3
(2) Non-Notched VR Check
• Rotate the following VRs (pots) in the indicated sequence.
[COMPRESSOR:SUSTAIN]→[COMPRESSOR:LEVEL]→[NS:THRESHOLD]→
[REVERB]→[MASTER LEVEL]→[OVERDRIVE/DISTORTION:DRIVE]→
[OVERDRIVE/DISTORTION:BOTTOM]→
[OVERDRIVE/DISTORTION:TONE]→
[OVERDRIVE/DISTORTION:LEVEL]→[MODULATION:RATE/KEY]→
[MODULATION:DEPTH/HARMONY]→
[MODULATION:E.LEVEL/RESONANCE]→
[DELAY:TIME]→[DELAY:FEEDBACK]→[DELAY:E.LEVEL]
Note: Confirm that what is displayed in the seven-segment LED changes with
each notch position.
fig.test-11_70
fig.test-12_70
fig.test-13_70
fig.test-14_50
1 2
3 4
7 8 9 10 11 12
6
5
4
5
15
13 14
If no problem exists, the procedure automatically proceeds to the next step.
6. EXP Pedal Check
• Start with the expression pedal in the depressed position.
• Carry out the following operations in the indicated sequence.
fig.test-15_70
1. Raise the tip of the expression pedal until it is at its highest point.
fig.test-16_70
2. Lower the tip of the expression pedal until it is approximately at the
midpoint.
fig.test-17_70
3. Once again, press down tip down completely so that the pedal is in the fully
depressed position.
fig.test-18_70
If no problem exists, the procedure automatically proceeds to the next step.
7. DSP Check
• The DSP check is performed automatically.
If no problem exists, the procedure automatically proceeds to the next step.
8. D/A Circuitry Check
fig.test-19_70
• Oscilloscope Settings: Ch1: 0.2 V/div; Ch2: 0.2 V/div; TIME: 0.5 ms/div
• Connect the cable only to the OUTPUT L(MONO) jack, then confirm that
the waveform output by OUTPUT L(MONO) changes accordingly, as
shown in the figures below.
ME-50
15