Roland Dr. Rhythm DR-770 Service Notes page 9

DR-770
[3]. RAM check
1. Press the numeric button [3] to run this test.
This test automatically performs the RAM check.
If normal, the display will show "OK". If a malfunction is
found, the display will show "NG".
2. Press the [STOP/EXIT] button to return to the main screen.
[4]. ROM check
1. Press the numeric button [4] to run this test.
This test automatically performs the ROM check.
If normal, the display will show "OK". If an error occurs, the
display will show as follows.
· If there is an error on the wave ROM
· If there is an error on the program ROM
· If there is an error on the wave ROM and program ROM
2. Press the [STOP/EXIT] button to return to the main screen.
[5]. MIDI check
1. Before entering this test, connect MIDI IN to OUT using the
MIDI cable.
2. Press the numeric button [5] to run this test.
If the test result is normal the display will show "OK".
If the test is entered before connecting the MIDI cable, the
display will show "NG". Connect the MIDI cable properly
and the display will change to "OK".
3. Press the [STOP/EXIT] button to return to the main screen.
[6]. FSR (key-pads) check
This test checks whether the FSR (key-pads) is functioning.
1. Press the numeric button [6] to run this test.
The display will show as follows:
2. In the " " field the key-pad number is displayed, and in
the " " field the pressure value is indicated.
An asterisk "*" is displayed when the pressure value reaches
"127".
When a key-pad is pressed, the red LED first goes on and
then the green LED turns on when the pressure reaches
"127".
A beep of oscillation sound is output from the OUTPUT-L/R
jacks.
If the FSR pattern touches a key-pad or two key-pads are
pressed simultaneously, the display will show "T" to the right
of the key-pad number as shown in the figure below.
At the same time, the key-pad number being touched will be
displayed at the lower right of the LCD display.
3. When all the key-pads are pressed with a pressure of more
than 127 and there is no pattern touch in the FSR, the display
will show "OK". If the pressure value is low or any pattern
touch occurs, the display will show "NG".
4. Press the [STOP/EXIT] button to return to the main screen.
[7]. Sound check
This performs the tests for sounding and panning.
1. Press the numeric button [7] to run this test.
The display will show as follows:
K Sounding
2. In the " " field the output destination is displayed, and
in the " " field the velocitiy is indicated.
3. When you press one of key-pads 1 to 4, sound will be output
as shown in the table below.
Pad no. /
Output destination /
Sound /
Feb. 1999
1 2 3
L R IND1
TOM1 TOM2 TOM3
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