Test Mode - Roland SUPER Octave OC-3 Service Notes

TEST MODE

Required Items
Tools Required
• Oscillator
• Oscilloscope
• Noise meter
• 47 kΩ short plug (#17041375)
fig.plug
• Monitor Speakers
1. Test Categories
1.
DSP, CPU Check
2.
DIRECT LEVEL Volume Check
3.
OCT1 LEVEL Volume Check
4.
CONTROL (RANGE, OCT2, DRIVE) Volume Check
5.
AF/AD Check
6.
DAC, JACK Switch Check
7.
MUTE Check
8.
MODE Volume Check
9.
DSP THRU MAXIMUM Output Check
10. BYPASS MAXIMUM Output Check
11. Battery Check
12. Noise Check
2. Entering Test Mode
• Turn all volume controls down completely (to minimum). Set MODE to
DRIVE.
• Hold down the pedal and connect the DC plug to adapter jack.
• When CHECK lights up, release the pedal.
• The CHECK light goes off for approximately two seconds, then lights
again, indicating that the unit has entered test mode.
The unit will not switch to test mode unless all volume controls are turned
completely down. Furthermore, the unit will not enter test mode if, due to
faulty volume controls or other cause, the minimum value is not detected for
all volume controls.
If CHECK does not light, if may be due to a faulty LED. Switch the pedal on
and off in Normal mode to confirm that CHECK lights and goes off. If CHECK
flashes, refer to "1. DSP, CPU Check" in "3. Tests."
For instructions on skipping tests in order to perform only a particular test
item, refer to "5. Instructions for Performing Only Desired Tests" following the
detailed descriptions of the test items.
3. Tests
1. DSP, CPU Check
• Refer to "2. Entering Test Mode" and switch to Test mode.
• A check of the DSP and CPU is performed automatically while the
CHECK light is off. If no problem is detected, CHECK lights up and the
unit enters Test mode; CHECK flashes if an error has occurred.
• Connect the oscillator to GUITAR IN or BASS IN and input a rectangular
wave (200 Hz, 100 mVp-p) and check the waveform output with the
oscilloscope from both OUTPUT (MONO) and DIRECT OUT. Confirm
that the waveform output is the same 200 Hz, 100 mVp-p waveform
shown in the figure (DSP THRU).
fig.test-DSPthru_50
50mV/DIV, 1mS/DIV
• If CHECK lights up, the process automatically advances to the next step.
If CHECK flashes, it may be due to a fault surrounding the DSP or CPU, faulty
soldering, or other such problems. Disconnect the DC plug from the adapter
jack and turn off the power.
2. DIRECT LEVEL Volume Check
• Rotate the knob in the clockwise direction from minimum to center, then
to maximum; CHECK should change from lit to off to lit.
• When the maximum is detected, CHECK lights up, and then the process
advances to the OCT1 LEVEL Volume Check.
3. OCT1 LEVEL Volume Check
• Rotate the knob in the clockwise direction from minimum to center, then
to maximum; CHECK should change from lit to off to lit.
• When the maximum is detected, CHECK lights up, and then the process
advances to the CONTROL (RANGE, OCT2, DRIVE) Volume Check.
The maximum values for the OCT1 LEVEL Volume Check and DIRECT
LEVEL VOLUME are detected simultaneously. The OCT1 LEVEL Volume
Check is not run unless the DIRECT LEVEL Volume maximum is detected.
4. CONTROL (RANGE, OCT2, DRIVE)
Volume Check
• Rotate the knob in the clockwise direction from minimum to center, then
to maximum; CHECK should change from lit to off to lit.
• When the maximum is detected, CHECK lights up, and then the process
advances to the AF/AD Check.
OC-3
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