Roland OD-20, Заметки по обслуживанию

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14
Apr.2002
3. Test contents
1. IC check
1.
When you enter test mode, the DSP(IC5) and EEPROM(IC4) check will
begin automatically.
2.
If no problem is found, the EFFECT ON/OFF LED, MANUAL LED, and
MEMORY LED will light.
3.
If a problem is found, the LEDs will indicate the problem as follows.
ON/OFF LED blinking: EEPROM error
MANUAL LED blinking: DSP(PRAM) error
MEMORY LED blinking: DSP(IRAM) error
If a problem is found, the unit will remain in this state, and it will not be
possible to carry out the remaining tests.
2. Switching noise / shock noise check
1.
With the EFFECT ON/OFF LED, MANUAL LED, and MEMORY LED lit,
connect a short plug (47k
Ω
) to INPUT, and a monitor speaker to OUTPUT.
2.
Press the EFFECT ON/OFF switch several times, and verify that no
abnormal switching noise occurs.
3.
Press the EFFECT ON/OFF switch to make the EFFECT ON/OFF LED
go dark (ANALOG BYPASS), and drop the unit from a height of
approximately 10 cm to subject it to physical shock. Verify that no
abnormal noise occurs.
4.
Press the EFFECT ON/OFF switch to make the EFFECT ON/OFF LED
light (DSP THRU), and drop the unit from a height of approximately 10
cm to subject it to physical shock. Verify that no abnormal noise occurs.
3. Residual noise check
1.
Connect a noise meter to the OUTPUT.
2.
Press the EFFECT ON/OFF switch to make the EFFECT ON/OFF LED
light (DSP THRU), and measure the residual noise.
Verify that the value detected by the noise meter is below -73 dBm (IHF-A).
3.
Press the EFFECT ON/OFF switch to make the EFFECT ON/OFF LED
go dark (BYPASS), and measure the residual noise.
Verify that the value detected by the noise meter is below -104 dBm (IHF-A).
4. SW and LED check
1.
Press the VARIATION switch, and you will proceed to the switch and
LED check.
First verify that only the VARIATION LED is lit.
The other LEDs will be dark.
Press the switches in the following order, and verify that in a similar
way, only one LED at a time is lit.
2.
Press the AMP CTRL switch, and verify that only the AMP CTRL LED is lit.
3.
Press the MEMORY WRITE switch, and verify that only the EFFECT
ON/OFF LED is lit.
4.
Press the MEMORY WRITE switch, and verify that only the MANUAL
LED is lit.
5.
Press the MEMORY WRITE switch, and verify that only the MEMORY
LED is lit.
6.
Press the MEMORY SELECT switch, and verify that only the MEMORY 1
LED is lit.
7.
Press the MEMORY SELECT switch, and verify that only the MEMORY 2
LED is lit.
8.
Press the MEMORY SELECT switch, and verify that only the MEMORY 3
LED is lit.
9.
Press the MEMORY SELECT switch, and verify that only the MEMORY 4
LED is lit.
(It is not possible to proceed to other test items before you have finished
the above procedure.)
5. AMP control check
1.
Connect the AMP CTRL jack to the channel switching jack of the guitar
amp.
2.
Verify that the guitar amp channel is switched each time you press the
AMP CTRL SW.
6. VR check
1.
Turn the DRIVE volume from MIN to MAX, and verify that the
MEMORY 1-4 LEDs are all dark when the volume is at MIN (the instant
you begin turning the volume), and light correspondingly as you turn the
volume, so that all LEDs are lit when you reach MAX.
(Each VR you operate here must be left at the MAX position so that you
will be able to proceed to the next test item.)
In the same way, perform this test in the following order for the other
VR’s.
2.
BOTTOM volume
3.
TONE volume
4.
LEVEL volume
5.
ATTACK SHAPE volume
6.
HEAVY OCTAVE volume
7.
With the TYPE volume turned all the way to the left, turn it toward the
right one click at a time, and verify that the LEDs change as follows.
(TABLE A)
dark lit
(TABLE A)
TYPE EFFECT MANUAL MEMORY VARI AMPCTRL MEM1 MEM2 MEM3 MEM4
0 (OD-2/OD-1)
1 (BD-2/DS-1)
2 (HM-2/MT-2)
3 (BOOST/LEAD)
4 (CRUNCH/STACK)
5 (METAL/LOUD)
6 (T-SCREAM/FULL-D)
7 (DST+/CENTA OD)
8 (GUV DS/P-RAT)
9 (R-MAN/MUFF FUZZ)
10 (FACE/OCT FUZZ)