Roland DJ-2000, Заметки по обслуживанию

Страница: 8 / 22

8
Names of potentiometer Corresponding LEDs
[RATE/CUT OFF] : OD+DELAY
[PITCH/DEPTH] : DELAY
[FORMANT/RESO] : VOICE
[EFFECT BAL] : ■ / t
If all the potentiometers are normal, press the [TAP]
button to advance to next test.
5. BPM TEST
Input the 100Hz of the requtangular wave (or music)
to the Input and rotate the GAIN knob of the MIXER
section MAX to MIN. Check that the display changes
as follows.
If the function are normal, press the [TAP] button to
advance to next test.
6. DSP TEST
When entering the DSP TEST, the following display will
appear.
Input the SIN wave (or music) to the [Input] ,and confirm
that the same SIN wave (or music) is output from the
[output] after a 1.5 sec.delay.
This test checks the operation of the DRAM. by reading
out a 1.5 sec.delay wave that was wrote to the DRAM
Check that the sound is output for 1.5 sec. even if you
stop the input sound.
Test mode is complete. (If you press the [TAP]button,
you can return to the LED test.)
To exit test mode, turn the power off.
CHECK:
Inspect the signal path of the ADDRESS/DATA BUS
for short circuit, cold joint or break in a trace.
2. LED TEST
When entering the LED TEST, LEDs light up and
down automatically by the following order.
Check that all LEDs turn on normally.
[FREQ RANGE] (4 red LEDs) ➝ [SYNC TYPE](5
green LEDs)
➝
[BPM SYNC] (red and green)
➝
[OD+DELAY]
➝
[DELAY]
➝
[VOICE]
➝
[FLANGER]
➝
[FILTER]
➝
[
■
/
t
]
➝
7-seg LED
After that, all LEDs blink at the same time twice, and
DJ-2000 repeat the same operation.
If all LEDs are normal, press the [TAP] button to
advance to next test.
3. SWITCH TEST
Check the operation of all switches in the following
order.
Press the following buttons, and confirm that the
corresponding LEDs go dark.
Names of switches Corresponding LEDs
[FREQ RANGE] FREQ RANGE (4 LEDs)
[SYNC TYPE] SYNC TYPE (5 LEDs)
[BPM SYNC] BPM SYNC
[OD+DELAY ] OD+DELAY
[DELAY ] DELAY
[VOICE ] VOICE
[FLANGER] FLANGER
[FILTER] FILTER
[
■
/ t ]
■
/ t
[BPM ADJ (
▼
) ] display of the left end of the
7seg-LEDs changes "o" to "_".
[BPM ADJ ( ▲ ) ] display of the middle of the
7seg-LEDs changes "o" to "_".
(If you press the [TAP] button, you will advance to the
next test.)
If all LEDs are normal, press the [TAP] button to
advance to next test.
4. VR TEST
Rotate the each of four potentiometers, [RATE/CUT
OFF], [PITCH/DEPTH], [FORMANT/RESO], [EFFECT
BAL] MIN to MAX and confirm that the value in the 7-
seg LEDs changes from 0 to 255.
While operating the each pot., corresponding LED
lights up.
Input level:MAX. Input level:MID. Input level:MIN
May, 1998 DJ-2000
t
t t
t