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Sep.2004
TEST MODE
Required Items
Tools Required
• Oscillator
• Oscilloscope
• Noise meter
• 47k OHM short plug (#17041375)
fig.plug
• Monitor speakers
• Expression pedal (Roland EV-5)
Test Categories
1.
DSP, CPU Check
2.
EFFECT Volume Check
3.
DIRECT Volume Check
4.
FREQ Volume Check
5.
RES Volume Check
6.
DECAY/RATE Volume Check
7.
Expression Pedal (EV-5) Insertion Check
8.
Expression Pedal (EV-5) Volume Check
9.
AF/AD Check
10. DAC, JACK Switch Check
11. DSP THRU Maximum Output Check
12. DSP MUTE Check
13. ANALOG BYPASS Maximum Output Check
14. ANALOG MUTE Check
15. ANALOG NOISE Check
16. MODE Volume Check
17. Battery Check
18. Noise Check
Entering Test Mode
• Turn all volume controls down completely (to minimum). Set MODE to
1.
• Hold down the pedal and connect the DC plug to the 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 causes, the minimum value is not detected for all
volume controls.
*
The unit enters Test mode even without an expression pedal (EV-5) connected to
the EXP jack.
*
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 "Tests."
*
For instructions on skipping tests in order to perform only a particular test item,
refer to "Instructions for Skipping Tests."
Exiting Test Mode
• The pedal may be pressed to exit Test mode.
*
"17. Battery Check" and "18. Noise Check" are not Test mode items, but are
performed in Normal mode.
8
Instructions for Skipping Tests
• Follow the instructions in "Entering Test Mode" and switch to Test
mode.
• When the pedal is released, the unit automatically runs "1. DSP, CPU
Check"; if no error is detected, CHECK lights up.
• Use the MODE control to select the desired test category.
MODE 1: EFFECT, DIRECT, FREQ, RES, DECAY/RATE Volume Check
MODE 2: Expression Pedal (EV-5) Insertion Check
MODE 3: Expression Pedal (EV-5) Volume Check
MODE 4: AF/AD Check
MODE 5: DAC, JACK Switch Check
MODE 6: DSP THRU Maximum Output Check
MODE 7: DSP MUTE Check
MODE 8: ANALOG BYPASS Maximum Output Check
MODE 9: ANALOG MUTE Check
MODE 10: ANALOG NOISE Check
MODE 11: MODE Volume Check
*
The volume checks can be run only in the following sequence: EFFECT-
>DIRECT->FREQ->RES->DECAY/RATE.
*
To run "17. Battery Check" and "18. Noise Check," turn on the power without
entering Test mode items, and instead perform these in Normal mode.
Precautionary Note
Be sure to confirm all test categories following repair of adjustments to the
instrument.
Tests
1. DSP, CPU Check
• Refer to "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 INPUT, input a rectangular wave (200 Hz, 100
mVp-p), and check the waveform output with the oscilloscope from both
OUTPUT A(MONO) and OUTPUT B. Confirm that the waveform output
is the same 200 Hz, 100 mVp-p waveform shown in the figure (DSP
THRU).
fig.test-DSPthru.eps_40
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 problem. Disconnect the DC plug from the adapter jack
and turn off the power.
2. EFFECT 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 DIRECT Volume Check.
3. DIRECT 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
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