Roland BOSS RT-20, Заметки по обслуживанию

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13
Dec. 2005 RT-20
Checking the Version
Number
Enter Test Mode and execute “ 1. CPU, DSP Check ” and “ 2. Version Check ”
in this order.
About Updating
Exchange the circuit board for updating of system program. Follow the service
information when it’s needed.
Test Mode
Test Items
1. CPU, DSP Check
2. Version Check
3. Knobs Check
4. DRIVE TYPE Switch Check
5. Expression Pedal Check
6. Analog Bypass Waveform Check
7. Analog Bypass Route FET Switch Check
8. D/A Output Waveform Check
9. DSP Through (Output) Waveform Check
10. DSP Through (PHONES) Waveform Check
11. DSP Route FET Switch Working Check
12. Bypass Route Residual Noise Check
13. DSP Through Route Residual Noise Check
14. Battery Working Check
Items Required
• Monitor Speaker
• Expression Pedal (EV-5)
• Noise Meter
• AC Adaptor (PSA series)
• 47-k
Ω
Short Plug x 2
• Oscilloscope
• Oscillator
Entering Test Mode
1.
Rotate all of the eight knobs on the top panel counterclockwise fully.
2.
While holding down the left and right pedals, connect the AC adaptor.
3.
When the POWER LED lights, release the both pedals.
4.
Press the left pedal within 2.5 seconds, then press the right pedal.
When the blue LEDs light, you will enter the Test Mode, and 1. CPU, DSP
Check is executed automatically.
Exiting Test Mode
Turn off the power.
Skipping
If you set the MODE knob previously as follows before entering the Test Mode,
you can specify the start point of the Test Mode.
MODE knob I: from 1. CPU, DSP Check (normal Test Mode)
MODE knob II:
from
6. Analog Bypass Waveform Check
MODE knob III: from 8. D/A Output Waveform Check
MODE knob VI:
from
12. Bypass Route Residual Noise Check
1. CPU, DSP Check will be always executed irrespective of the MODE knob’s
setting first. And next, when the right pedal is pressed, you will enter the test
item corresponding to the MODE knob’s setting. You can confirm which test
item you entered by checking the Virtual Rotor Display. (Refer to the
explanation of each test item.)
Any test item can be skipped by pressing the right pedal (SLOW/FAST pedal).
However, the test item
3 , 4 , and 5 can be skipped.
Details for Tests
1. CPU, DSP Check
After entering the Test Mode, first, CPU and DSP will be tested. If they are
normal, two blue LEDs in the Virtual Rotor Display will light as the following
picture.
fig.01-cpudsp
If there are any problems, you cannot advance to the next test item. Then turn
off the power to finish the Test Mode.
2. Version Check
1.
Press the right pedal to start the Version Check .
Version is shown in the Virtual Rotor Display as the following picture.
fig.02-cpuver
Ver. 1.00 Ver. 1.01
Ver. 1.02 Ver. 1.03