Roland Boss RC-20XL Service Notes page 17

11.AUX IN (NORMAL) check
• Set the PHRASE SELECT volume to the '6' position.
• Verify that "LOOP QUANTIZE" is dark and "LOOP PHRASE" is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
fig.NORMAL_40
(0.5V/DIV, 1mS/DIV)
0.6Vp-p 0.1Vp-p
12.AUX IN (FLAT AMP SIMULATE) check
• Set the PHRASE SELECT volume to the '7' position.
• Verify that "LOOP PHRASE" is dark and "INST & MIC" is lit.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
fig.F-AMP_40
(0.5V/DIV, 1mS/DIV)
2.0Vp-p 0.2Vp-p
• Press the FS-5U that is connected to the REVERSE jack, and verify that
the waveform does not decrease.
13.AUX IN (CENTER CANCEL) check
• Set the PHRASE SELECT volume to the '8' position.
• Verify that "INST & MIC" is dark and "NORMAL" is lit.
• Verify that there is no longer an output waveform.
14.AUX IN (L ch) check
• Set the PHRASE SELECT volume to the '9' position.
• Verify that "NORMAL" is dark and "CENTER CANCEL" is lit.
• Input only the L channel to AUX IN.
• Verify that the output waveform is the same as the waveform shown in
the diagram.
fig.L-ch_40
(0.5V/DIV, 1mS/DIV)
1.8Vp-p 0.2Vp-p
15.solder spot check
• Set the PHRASE SELECT volume to the '10' position.
• Verify that "CENTER CANCEL" is dark and "FLAT AMP SIMULATE"
is lit.
• Verify that there is no longer an output waveform.
• Set the PHRASE SELECT volume to the '11' position.
• Verify that all LEDs are lit except for "PEAK."
• Verify that the output waveform is the same waveform as shown in the
diagram.
fig.DA_40
(0.5V/DIV, 1mS/DIV)
200Hz, 2.2Vp-p 0.2Vp-p
16. PHRASE SELECT volume check
• Set the PHRASE SELECT control to the "10" position.
• Confirm that the FLAT AMP SIMULATE LED goes off.
• Set the PHRASE SELECT control to the "9" position.
• Confirm that the CENTER CANCEL LED goes off.
• Set the PHRASE SELECT control to the "8" position.
• Confirm that the NORMAL LED goes off.
• Set the PHRASE SELECT control to the "7" position.
• Confirm that the INST & MIC LED goes off.
• Set the PHRASE SELECT control to the "6" position.
• Confirm that the LOOP PHRASE LED goes off.
• Set the PHRASE SELECT control to the "5" position.
• Confirm that the LOOP QUANTIZE LED goes off.
• Set the PHRASE SELECT control to the "4" position.
• Confirm that the TAP TEMPO LED changes from red to orange.
• Set the PHRASE SELECT control to the "3" position.
• Confirm that the TAP TEMPO LED goes off.
• Set the PHRASE SELECT control to the "2" position.
• Confirm that the REVERSE LED goes off.
• Set the PHRASE SELECT control to the "1" position.
• Confirm that all LEDs other than the PEAK LED are lit.
• Confirm that the "POWER" indicator is lit.
17.Noise check
• Set the PHRASE SELECT volume to the '2' position.
• Connect a 47k ohm short plug to the INST jack, a 150k ohm short plug
to the MIC jack, and a 1 k ohm stereo short plug to the AUX IN jack.
• Connect a monitor amp to OUTPUT.
• Set the INST volume and MIC volume to the maximum.
• Drop the unit from a height of 10 cm, and verify that no abnormal noise
is output.
• Turn the INST volume and MIC volume, and verify that no abnormal
noise is output.
• With the INST volume and MIC volume at the maximum positions,
measure the residual noise, and verify that it is less than -78 dBm (IHFA).
18.Battery operation check
• Put the battery in the battery compartment and insert the plug into the
OUTPUT jack.
• Verify that POWER is lit
RC-20XL
17