Roland SDE-3000 - Page 25

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SDE-3000 ADJUSTMENT
1. VOLTAGES CHECK
IC24
4514
8.'tltv8
Front Panel S
i;^l"®fdp
2. INPUT LEVEL METER
OFF
2-1 Set UNIGAIN (Rear panel) to +4dBm.
2-2. Connect audio generator (AG) to INPUT Jack and
set AG output for +4dBm, 1kHz, sine.
3. VCO
3-1. Set DELAY TIME (Rear panel) to XI.
3-2. Press and hold DELAY TIME button until TIME
display reads maximum value.
4. LFORATE
TEST POINT: MODULATION CV INV OUT
(connect to oscilloscope)
4.1. Press and hold RATE button until RATE display
. • reads 09.
4-2. Adjust VR7 for lOOms/cycle.
5. FREQUENCY RESPONSE
23. Set VR2«t the point where +3dBm LED Juttcom
pletely fedes out.
3-3. Press TIME X2 (ON).
34. Adjust LI for 301011ms reading.
NOTE: A TIME display change delays 1 tec behind a
coll adjustment.
ov
100m*
□ =:•
TEST POINT: DELAY OUT (connect to AC voltmeter)
8-1. Set UNIGAIN (Rear panel) to 44dBm and OELAY
Set AO lor -lOdBm.
82. Connect AO
1kHi. sine.
B-3. Adjust INPUT ATT lor -10dBm reading.
6. FEEDBACK
&4.. Reset AG to 8.6kHt.
Adjust VR4 for -10.2dBm rereading.
8-6. Press DELAY TIME X2 (ON).
Reset AO lor «OW"«. - reiSm.
B4. Adjust INPUT ATT for -lOdBm reading.
B-7. Reset AG to -10dBm, BkHf.
Adjuit VRB for -10.2d.Bm reading.
-ALL OFF
8-1. Sat DELAY TIME to X1.
82.Turn VR3 fully clockwise. All INPUT level LEOs
wUMIflhtupftom-20to-t6.
8-3. Gradually reverse VR3 until 48 and +3 LEDs 90 off
completely.
7. D/A OFFSET
TEST POINT: TP-1 (connect to scope, Y-axb or V
IN-DCcouple)
Connect TP-2 to X-axis or EXT TRIG.
>1*S«t UNIGAIN to -20dBm and DELAY TIME to
^ AG to INPUT lack. Set AG for -IBdBm.
UjQHt.slne.
^scope's VOLTS/DIVA/AR to show a pattern
te^Nl In the photo.
"A" Is on the center
6-4, Oonflrwtht following:.
FEEDBACK M\ at SI. +3 *nd -HI light asaln
i «
VWth FEEDBACK M\ .
Wlfh FEEDBACK 79, ail level LEDs go o« one by