Roland DR-880, Заметки по обслуживанию

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20
Dec.2004
3. SW and LED check
fig.swcheck1.eps
Press the switch whose name is displayed.
For switches that have a lit LED, verify that the LED goes dark when you press
the switch.
fig.swcheck2.eps
fig.swcheck3.eps
If you pressed the correct switch.
fig.swcheck4.eps
If you pressed the wrong switch. (Ex. press the KIT)
fig.swcheck5.eps
When all have been completed, press [BANK] to proceed to the next test item.
4. LCD and Encoder check
fig.lcdencordercheck1.eps
4-1. Adjusting the LCD contrast
Verify that there is no crosstalk in the background and is no unevenness in the
contrast.
If there is a no problem with the contrast.
-> Use [BANK] to proceed to the next test item
If there is a problem with the contrast.
->Make this adjustment, please refer to followings.
Turn the encoder counter-clockwise to lighten the contrast.
Turn the encoder clockwise to darken the contrast.
* The standard setting is "0." It is adjustable in a range from "-4" through "+4".
When you're finished making the setting, press [ENTER]. The display will
indicate "Now Writing," and the setting will be written into memory.
Press the [BANK] switch to proceed to the next test item.
4-2. Slowly turn [VALUE] clockwise for
three clicks.
fig.lcdencordercheck2.eps
Verify that the display changes from 0 -> 1 -> 2 -> 3, and that the contrast
below the characters darkens.
Verify that the characters can still be read even when the contrast is darkest
(third click).
4-3. Slowly turn [VALUE] counter-
clockwise for three clicks.
fig.lcdencordercheck3.eps
Verify that the display changes from 3 -> 2 -> 1 -> 0, that the contrast below the
characters lightens, and that the characters do not disappear.
Press [BANK].