Roland SDE-3000 - Page 16

FEB. 5,1984
SDE-1000 ADJUSTMENT
1. LEVEL METER CALIBRATION
1-1. Set UNIGAIN (Rear panel) to -20dBm.
1-2. Connect audio generator (AG) to INPUT jack and
set AG for -20dBm, 1kHzf sine.
2. DELAY TIME
1-3. Set RT8 at the point where +3dB LED just com
pletely fades out.
MVTATT FEEDBACK DELAY OUT
SRoland
-OFF
2-1. Set DELAY TIME (VR1, Rear panel) to XI.
2-2. Press and hold DELAY TIME button until DELAY
TIME display reads maximum value.
3. COMPRESSOR LEVEL LINEARITY
2-3. Adjust RT6 for 379 ± 1ms reading.
2-4. Repeat step 2-2. If the reading changes, readjust
RT6for379±1ms.
WUTATT FEEDBACK 06LAV OUT
(BRoland
-OFF
3-1. Set DELAY TIME (Rear panel) to X1 and UNI
GAIN to-20dBm.
3-2. Connect AG to INPUT jack and set for -10dBm,
1kHz, sine.
3-3. Adjust DELAY OUT (VR4) for -10dBm reading.
4. COMPRESSOR TOTAL HARMONIC DISTORTION
3-4. Reset AG to -60dBm. Adjust RT1 for -60 ±
0.5dBm reading.
3-5. VR4 and RT1 interact Repeat from 3-2 through
3-4.
TEST POINT: TP2 (connect to oscilloscope - -
DC coupling)
4-1. Set DELAY TIME to X1 and UNIGAIN to -20
dBm.
4-2. Connect AG to INPUT jack and set for 1kHz, sine,
burst tone (4-0-4 cycles). Adjust AG output level so
OFF
that the first bottoms (a) are at +1V on the scope.
4-3. Adjust RT2 for straight DC level.
4-4. Set scope V IN to AC coupling.
4-5. Repeatedly rotating INPUT ATT over its full travel,
fine adjust RT2 for minimum DC drift.
Adjust scope VAR as necessary.
SDE-1000/3000
6. EXPANDER TOTAL HARMONIC DISTORTION
TEST POINT: DELAY OUT (connect to scope - -
DC coupling)
5-1. Set DELAY TIME to X1 and UNIGAIN to
-20dBm.
5-2. Feed the same signal as for 4-2.
5-3. Adjust RT3 for straight DC line.
5-4. Set scope V IN to AC coupling.
6. FREQUENCY RESPONSE
OFF
5-5. Repeatedly rotating INPUT ATT over its full travel,
fine adjust RT3 for minimum DC drift.
Adjust scope VAR as necessary.
5-6. Connect amplifier/speaker to DELAY OUT and
check for pop or rumble noise. If noticeable, check
for absence of R271 and R272 (see table on the fac
ing page) which are effective to the problem.
■"Fl/TATT FEEDBACK DELAY OUT
TUSSTj
SH^Roland
□
-OFF
TEST POINT: DELAY OUT (connect to AC voltmeter)
6-1. Set DELAY TIME to X1 and UNIGAIN to -20
dBm.
6-2. Connect AG to INPUT jack and set AG output for
-20dBm, 1kHz, sine.
6-3. Adjust INPUT ATT for -30dBm reading.
7. FEEDBACK
6-4. Reset AG to 8.5kHz.
Adjust RT4 for -30.2dBm reading.
6-5. Press DELAY TIME X2 (ON). Reset AG to400Hz,
-30dBm.
6-6. Adjust INPUT ATT for -30dBm reading.
6-7. Reset AG to 5kHz, -30dBm.
Adjust VR5 for -30.2dBm reading.
T ATT FEEDBACK DELAY OUT
OFF-
BRoland
• <** i I
ON
TEST POINT: DELAY OUT (connect to scope)
7-1. Set DELAY TIME to X1 and UNIGAIN to -20
dBm.
7-2. Apply a signal (e.g. -30dBm, 1kHz, sine) to INPUT
jack for an instant and adjust RT7 for continual re
peats at a level.
7-3. Verify decaying repeats with FEEDBACK at 7.5.
15