Roland OD-20, Service Notes

Page: 13 / 21

13
OD-20(T)
CHECKING THE VERSION
NUMBER
After you enter test mode, perform step 5.
1.
Turn all knobs to MIN (all the way to the left).
2.
While holding down the left pedal and the right pedal, insert the 9V plug
into DC IN.
At this time, only the POWER LED will light.
3.
Release the left and right pedals. The EFFECT ON/OFF LED will blink.
4.
Within four seconds, press the left pedal and then the right pedal.
If you were successful in entering test mode, the EFFECT ON/OFF LED,
MANUAL LED, and MEMORY LED will light.
5.
Set the TYPE volume to METAL/LOUD.
. The version number will be indicated as follows.
For Ver1.00, only the MEMORY 2 LED will light.
(The integer portion is indicated by the MEMORY 1 and 2 LEDs
1: MEMORY 1 LED: dark MEMORY 2 LED: lit
2: MEMORY 1 LED: lit MEMORY 2 LED: dark
3: MEMORY 1 LED: lit MEMORY 2 LED: lit
The first decimal place is indicated by the MEMORY 3 and 4 LEDs
0: MEMORY 3 LED: dark MEMORY 4 LED: dark
1: MEMORY 3 LED: dark MEMORY 4 LED: lit
2: MEMORY 3 LED: lit MEMORY 4 LED: dark
3: MEMORY 3 LED: lit MEMORY 4 LED: lit
The second decimal place is indicated by the MANUAL LED and
MEMORY LED
0: MANUAL LED: dark MEMORY LED: dark
1: MANUAL LED: dark MEMORY LED: lit
2: MANUAL LED: lit MEMORY LED: dark
3: MANUAL LED: lit MEMORY LED: lit )
RESTORING THE FACTORY
SETTINGS
Returning Settings to Their Factory Defaults
You can restore the memories (1-4), pedal mode settings, and the MEMORY
Number Indication to their original factory values.
Memory Settings
Memory 1 LOUD
Memory 2 LEAD
Memory 3 OD-1
Memory 4 STACK
Pedal Mode
1 (MANUAL -> MEMORY 1 -> MEMORY 2 -> MEMORY 3 -> MEMORY 4 ->
MANUAL)
MEMORY Number Indication
Lighting Pattern 1(Only the indicator for the selected memory lights up.)
Carrying out the following procedure completely clears the content currently
stored in the memories (1-4).
1.
Switch off the power.
Disconnect the connection plug from the INPUT jack.
2.
While holding down the WRITE button, switch on the power.
Insert the connection plug into the INPUT jack.
When you release the button, the MEMORY Number indicators blink.
3.
Press the MEMORY WRITE button.
After the MEMORY Number indicators begin blinking rapidly, the
setting is stored in memory and the unit returns to its ordinary state.
* To cancel the setting change, operate the EFFECT ON/OFF pedal or the
MANUAL/MEMORY pedal before pressing the MEMORY WRITE button.
The unit will return to its ordinary state.
TEST MODE
Required items
1. Oscillator
2. Noise meter
3. Oscilloscope
4. Monitor amp (e.g., MA-12)
5. Guitar amp (with a channel-switching jack)
6. Stereo plug
7. 47k
Ω
short plug
1. How to enter test mode
1.
Turn all knobs to MIN (all the way to the left).
Connect a short plug (47k
Ω
) to INPUT.
2.
While holding down the left pedal and right pedal, insert the 9V plug into
DC IN.
At this time, only the POWER LED will light.
3.
Release the left and right pedals. The EFFECT ON/OFF LED will blink.
4.
Within four seconds, press the left pedal and then the right pedal.
If you were successful in entering test mode, the EFFECT ON/OFF LED,
MANUAL LED, and MEMORY LED will light.
2. List of test items
1. IC check
2. Switching noise / shock noise check
3. Residual noise check
4. SW and LED check
5. AMP control check
6. VR Check
7. DAC check (includes FET SW (EFFECT)
inspection)
8. DSP thru check
9. Analog mute check (FET SW (DIRECT)
inspection)
10. Version check