Roland Boss RC-20XL Service Notes page 15

Exiting Test Mode
Turn off the power
Explanation of each test item
1.FLASH ROM check
• Enter Test mode.
• The FLASH ROM check will be performed when you enter Test mode.
• If there are no problems, all LEDs other than "PEAK" will light.
If there is a problem, the state of the LEDs will indicate the problem as
follows.
"OVERDUB" (yellow) blinking : MAKER ID error
"PLAY" (green) blinking : DEVICE ID error
"REC" (red) blinking : BUSY error
If a problem was found, operation will stop and it will not be possible to
proceed to the next step. Turn off the power to exit Test mode.
If there are any unlit LEDs regardless of whether or not there was a problem, it
is possible that the LED is faulty or soldered incorrectly. (With the exception of
"PEAK.")
2.Version number check
• Press the right pedal.
• The internal ROM version number and the external FLASH ROM version
number will be indicated by the LEDs.
Internal ROM version number display
This is indicated by the four LEDs "FLAT AMP SIMULATE", "CENTER
CANCEL", "NORMAL", and "INST & MIC."
"FLAT AMP SIMULATE" only lit : Ver1.00
"CENTER CANCEL" only lit : Ver1.01
"NORMAL" only lit : Ver1.02
"INST & MIC" only lit : Ver1.03
External FLASH ROM version number display
This is indicated by the following six LEDs: "TAP TEMPO", "WRITE", "EXIT",
"AUTO START", "ONE SHOT PHRASE",
and "LOOP QUANTIZE."
"TAP TEMPO" only lit : Ver1.01
"WRITE" only lit : Ver1.02
"EXIT" only lit : Ver1.03
"AUTO START" only lit : Ver1.04
"ONE SHOT PHRASE" only lit : Ver1.05
"LOOP QUANTIZE" only lit : Ver1.06
• After verifying the version, press the right pedal.
• All LEDs other than "PEAK" will light.
3.Switches and LED check
• Connect two FS-5U units to the PHRASE SHIFT jack and REVERSE
jack.
• Set the FS-5U polarity switches to the position shown in the diagram.
fig.FS5U_40
• Press the REVERSE switch.
• Verify that "REVERSE", "PLAY", and "OVERDUB", go dark, and that
"TAP TEMPO" changes from orange to red.
• Press the TAP TEMPO switch, and verify that "TAP TEMPO" goes
dark.
• Press the WRITE switch, and verify that "WRITE" goes dark.
• Press the EXIT switch, and verify that goes dark "EXIT."
• Press the AUTO START switch, and verify that "AUTO START" goes
dark.
• Press the MODE switch, and verify that "INST & MIC", "NORMAL",
"CENTER CANCEL", and "FLAT AMP SIMULATE" go dark.
• Press the FS-5U connected to the PHRASE SHIFT jack (left channel), and
confirm that the "ONE SHOT PHRASE" indicator light goes off.
• Press the FS-5U connected to the PHRASE SHIFT jack (right channel),
and confirm that the "LOOP PHRASE" indicator light goes off.
• Press the FS-5U that is connected to the REVERSE jack, and verify that
all LEDs other than "PEAK" light.
4.LEVEL volume check
• Refer to the connection diagram in "Entering Test Mode" and connect the
diagnostic equipment.
Input
INST : 200Hz, square wave, 200 mVp-p
MIC : 200 Hz, sine wave, -34 dBm
AUX IN : 200 Hz, square wave, 200 mVp-p, STEREO
• Move the LEVEL volume to approximately the center position, and
then back to the minimum position.
• Move the LEVEL volume from 'minimum' to 'maximum', and verify
that the waveform increases smoothly.
At this time, the MODE LEDs will light consecutively from "FLAT
AMP SIMULATE," following the waveform.
• With the LEVEL volume at maximum, verify that the output waveform
is the same as shown in the diagram.
• Confirm that all LEDs other than PEAK are lit.
fig.DA_40
(0.5V/DIV, 1mS/DIV)
200Hz, 2.2Vp-p 0.2Vp-p
5.GUIDE volume check
• Move the GUIDE volume to approximately the center position, and
then back to the minimum.
• Move the GUIDE volume from 'minimum' to 'maximum,' and verify
that the waveform increases smoothly.
At this time, the MODE LEDs will change successively from "FLAT
AMP SIMULATE," following the waveform.
• With the GUIDE volume at maximum, verify that the output waveform
is the same as shown in the diagram.
• Confirm that all LEDs other than PEAK are lit.
fig.DA_40
(0.5V/DIV, 1mS/DIV)
200Hz, 2.2Vp-p 0.2Vp-p
RC-20XL
15