Roland Dr. Rhythm DR-770 Operating and maintenance manual

DR-770 Feb. 1999
1
TABLE OF CONTENTS Page
SPECIFICATIONS ............................................................................................... 1
Deterioration in the conductive coating inside the case ............................................................................................... 2
PANEL LAYOUT ............................................................................................... 2
EXPLODED VIEW ............................................................................................... 3
PARTS LIST ............................................................................................... 4
LOADING THE FACTORY PRESET DATA ............................................................................................... 6
IDENTIFYING THE VERSION NUMBER ............................................................................................... 6
USER DATA SAVE AND LOAD ............................................................................................... 6
How to save the User Data ............................................................................................... 6
How to load the User Data ............................................................................................... 7
TEST MODE ............................................................................................... 8
TROUBLESHOOTING ............................................................................................... 11
ERROR MESSAGE ............................................................................................... 12
BLOCK DIAGRAM ............................................................................................... 13
CIRCUIT DIAGRAM (JACK) ............................................................................................... 14
CIRCUIT BOARD (JACK) ............................................................................................... 15
CIRCUIT DIAGRAM (MAIN) ............................................................................................... 16
CIRCUIT BOARD (MAIN) ............................................................................................... 17
Change Information ............................................................................................... 18
SERVICE NOTES
First Edition
Issued by RJA
Copyright © 1999 by ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION.
17059959 Printed in Japan AA00 (DP)
Dr. Rhythm
SPECIFICATIONS
●Instruments
255
●Maximum Polyphony
14 voices
●Rhythm Patterns
Preset Patterns : 400
User Patterns : 400
●Song
Songs :100
Song Length : Maximum 250 parts for a song
Total Parts for Songs : 10,000
●Effect
Reverb,Flanger
●Resolution
Per quarter note : 96
●Tempo
Quarter note=20 ~ 260
●Data Input Method
Realtime/Step
●Maximum Note Storage
approx.11,200note
●Output Level
Max.7 Vp-p(L(MONO),R)
●Noise Level
Less Than -78 dBm(DIN AUDIO)((L(MONO))
●Output Impedance
1kΩ(L(MONO),R, INDIVIDUAL))
●Power Source
AC Adaptor BOSS BRC Series
●Current Draw
700mA
●Dimensions
215(W)×165(D)×57(H)mm
8-1/2(W)×6-1/2(D)×2-3/8(H)inches
●Weight
715g/1 lbs 10 oz
●Accessories
Owner's Manual Set(English) : PNo.71238223
Owner's Manual Set(Japanese) : PNo.71238145
AC Adaptor
AC ADAPTOR BRC-100 BOSS :PNo.00899078
AC ADAPTOR BRC-120 BOSS :PNo.00899089
AC ADAPTOR BRC-230 BOSS :PNo. 00899090
AC ADAPTOR BRC-240A BOSS :PNo. 00899101
EURO CONVERTER PLUG ECP01-5A :PNo. 00905234

DR-770 Feb. 1999
2
PANEL LAYOUT
FRONT VIEW
REAR VIEW
Top Case
(01787767)
LED (red)
SLC-22VR3F
15039221
LED (green)
SLC-22MG3F
15039222
Rubber Switch KEY
(01787790)
Rubber Switch PAD
(01787801)
Pressure Sheet Sensor
(25095101)
Plate
(22055165)
<Top View>
Display Cover
(01787778)
LCD
RCD1627R
(01788490)
DR-Knob (BLK)
(22485303)
Rotary Volume
RK14k 124 50KB×2
(13289189)
DR-Knob (BLK)
(22485303)
Rotary Encoder
EC16B 24204
(01231367)
KEY Top
(12499175)
Switch
SPUN19F
(13129369)
Jack
HEC0740-01-010
(13449728)
Jack
YKB21-5130
(13449433)
Jack
HLJ7101-01-3010
(13449283)
Bottom Case
(01787734)
Jack
HLJ7001-01-3010
(13449284)
MIDI Connector
M-S2-3P
(13429642)
■ Deterioration in the conductive
coating inside the case
The inside of the case is coated with a conductive material. If the
board undergoes repeated detaching/attaching, the coating on the
boss may deteriorate.
If the resistance value between the case center and the head of the
boss becomes 5Ωor more, the effect of conductive coating cannot
be expected. In such a case, replace the case.

DR-770 Feb. 1999
3
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
EXPLODED VIEW
[Part]
NO. PART CODE PART NAME DESCRIPTION
q01787734 BOTTOM CASE
w01898189 FOOT D10 T4
e71238156 JACK BOARD ASSY
r12449445 FERRITE-CORE ESD-R-16C
t71238167 VR BOARD ASSY
y71238178 ENC BOARD ASSY
u01892034 VR SHIELD SHEET
i71238123 MAIN BOARD ASSY (EXG)
o22055165 PLATE 205-165
!0 25095101 PRESSURE SHEET SENSOR 509-101
!1 23365653 RUBBER CONNECTOR 336-653
!2 01788490 LCD RCD1627R
!3 01787790 RUBBER SW KEY
!4 01787801 RUBBER SW PAD
!5 01787767 TOP CASE
!6 12499175 G S-BUTTON S1H BLK 249-175
!7 01787778 DISPLAY COVER
!8 22485303 D R-KNOB L BLK 248-303
[Screw]
NO. PART CODE PART NAME DESCRIPTION
a40012456 SCREW M2.6×8 BINDING TAPTITE P FE NI
b40012489 SCREW M2.6×10 BINDING TAPTITE FE BZC
c40011223 SCREW M2.6×6 BINDING TAPTITE P NI
d
This MG WASHER and MG NUT are included in the #01231367 ROTARY ENCODER.
This MG WASHER and MG NUT are included in the #13289189 POTENTIOMETER.
!1
!8
!6
!4
!2
!3
!5
!7
a
b
c
1
2
3
4
7
8
9
!0
d
e
6
5c

DR-770 Feb. 1999
4
*1 *2
↓↓ CASING Q'ty
# 01787734 BOTTOM CASE 1
# 01787767 TOP CASE 1
# 01787778 DISPLAY COVER 1
22055165 PLATE 205-165 1
KNOB, BUTTON
12499175 G S-BUTTON S1H BLK 249-175 1
22485303 D R-KNOB L BLK 248-303 2
# 01787790 RUBBER SW KEY 1
# 01787801 RUBBER SW PAD 1
SWITCH
13129369 SPUN19430A PUSH SWITCH SW101 on JB 1
JACK, SOCKET
13429642 M-S2-3P MIDI SOCKET JK108,JK107 on JB 2
13449433 3.5MM STEREO YKB21-5130 JACK JK105 on JB 1
13449283 6.5MM HLJ7101-01-3010 JACK JK102,JK103,JK104 on JB 3
13449284 6.5MM HLJ7001-01-3010 JACK JK101 on JB 1
13449728 HEC0740-010010 ADAPTOR JACK JK106 on JB 1
DISPLAY UNIT
# 01788490 RCD1627R LCD 1
PCB ASSY
# E 71238123 MAIN BOARD ASSY (EXG) 1
NOTE : 'MAIN BOARD ASSY' includes the following parts.
12169388 LED SPACER LH-3-3 2
# 71238178 ENC BOARD ASSY 1
NOTE : 'ENC BOARD ASSY' includes the following parts.
23505274 WIRING HARNESS B 3P 350-274 1
# 71238156 JACK BOARD ASSY 1
NOTE : 'JACK BOARD ASSY' includes the following parts.
# 01898889 WIRING GND 1P 1
# 01788556 WIRING 6P 1
# 01898989 WIRING W11 1
# 01898001 HEATSINK (DR-770) 1
22465939 HEATSINK (DR-660) 1
22190758 HOLDER DIN SOCKET (2P) 1
40011112 SCREW M3¥10 BINDING TAPTITE B BZC 2
40011090 SCREW M3¥6 BINDING TAPTITE B BZC 2
40016512 LOCKING TIE 80M/M T-18S 2
40016545 INSULOK TIE SKM-1 1
# 71238167 VR BOARD ASSY 1
NOTE : 'VR BOARD ASSY' includes the following parts.
23505275 WIRING HARNESS C 6P 350-275 1
IC
# 01784678 HD6415108RF12 IC (CPU) IC6 on MB 1
15199923 SED1278F0A IC (LCD DRIVER) IC9 on MB 1
15239197 MB622928PF-G-BND-ER IC (GATE ARRAY) IC19 on MB 1
15239229 TC6116AF (GP-4) IC (PCM CUSTOM) IC5 on MB 1
01560289 TC55257DFL-55L(EL) IC SRAM IC10 on MB 1
01122412 TC551001CF-70L IC (SRAM) IC12 on MB 1
# 01788589 LHMN4708 IC (MASK ROM) IC8 on MB 1
# 01788578 LHMN5KRP WAVE ROM IC (MASK ROM) IC4 on MB 1
01340789 BU9480F IC (D/A CONVERTER) IC15,IC16 on MB 2
15259864T0 TC74HC4052AF(EL) IC IC13,IC11 on MB 2
15249104 TC7S04F(TE85L) IC (C MOS) IC14 on MB 1
15249111 TC7WU04F(TE12L) IC (C MOS) IC3 on MB 1
15259889 TC7S02F(TE85L) IC IC18 on MB 1
15269805 TC74AC14F(EL) IC IC2 on MB 1
15269810 TC74AC138F(EL) IC (CMOS) IC17 on MB 1
15289131 BA10393F-E2 IC (COMPARATOR) IC1 on MB 1
15289709 M51954BFP-600D IC (RESET) IC20 on MB 1
15289125 PC-410KT 178FAY IC (PHOTO COUPLER) IC7 on MB 1
15189186 UPC4570C IC (OP AMP) BIPOLAR IC102,IC101 on JB 2
15189248 M5216P IC (OP AMP) BIPOLAR IC103 on JB 1
# 01784834 M62421SP FILTER IC106 on JB 1
# 01897801 UPC7805AHF IC (REGULATOR) IC104 on JB 1
# 01897223 UPC24M09AHF IC (REGULATOR) IC105 on JB 1
TRANSISTOR
15309101 2SA1037KR T146 QRS TRANSISTOR Q3 on MB 1
15329518 DTA114TKT146 TRANSISTOR Q2,Q1 on MB 2
# 00894489 2SA1049-GR(TPE4) TRANSISTOR Q104 on JB 1
# 01788734 2SC2459-GR(TPE4) TRANSISTOR Q106,Q105 on JB 2
15129204 DTC343TS TP TRANSISTOR Q101,Q102,Q103 on JB 3
PARTS LIST
CONSIDERATIONS ON PARTS ORDERING
When ordering any parts listed in the parts list, please specify the following items in the order sheet.
QTY PART NUMBER DESCRIPTION MODEL NUMBER
10 22575241 Sharp key C-20/50
15 2247017300 Knob (orange) DAC-15D
Failure to completely fill the above items with correct number and description will result in delayed or even
undelivered replacement.
Ex.
SAFETY PRECAUTION:*1
The parts marked have safety-
related characteristics.
Use only listed parts for
replacement.
MB →Main Board Assy
VB →VR Board Assy
EB →ENC Board Assy
JB →Jack Board Assy
The parts marked #
are new (initial
parts). *2
Note : Consider about the natural environment carefully before through the old lithium battery away when you exchange to the new one.you exchange to the new one.

DR-770 Feb. 1999
5
DIODE
15339135T0 1SS300(TE85R) DIODE DA2-DA20 on MB 19
01127489 RB715F T106 SCHOTTKY DIODE DA1 on MB 1
# 15039221 SLC-22VR3F LED LED1 on MB 1
# 15039222 SLC-22MG3F LED LED2 on MB 1
15019126 1SS133 T-77 SWITCHING DIODE D104,D105,D106,D107 on JB 4
15019260 1G4B42 1A/400V BRIDGE DIODE D102 on JB 1
01122323 MTZJ T-77 8.2B ZENER DIODE D101 on JB 1
01122312 MTZJ T-77 5.6C ZENER DIODE D103 on JB 1
RESISTOR
15399975 RCE9A223JA (22KOHM X8) RESISTOR ARRAY RA4 on MB
15409113 EXBV8V103JV RESISTOR ARRAY RA7 on MB 1
15399965 RCE9A103JAG7A (10KOHM X8) RESISTOR ARRAY RA1,RA2,RA3 on MB
# 01788489 CNB2B9ZTE332 J R-ARRAY RA5,RA6 on MB 2
# 13749187 SR50TR 220 J CARBON RESISTOR R127,R132 on JB 2
# 01897834 ERF5AJ 150 CEMENT RESISTOR R137 on JB 1
# 01897812 RSSX3 5.6 OHM J MTL.OXIDE RESISTOR R136 on JB
POTENTIOMETER
13289189 RK14K124 L1=15 50KBX2 POTENTIOMETER VR301 on VB 1
CAPACITOR
# 00783990 MMTVA0050J474 200 M.POLYEST CAP. C150,C151 on JB 2
# 01897778 16MV470CZ CHEMICAL CAPACITOR C154 on JB 1
# 01897789 25MV470CZ+T CHEMICAL CAPACITOR C136,C137 on JB 2
# 01897790 16MV100UGX+T CHEMICAL CAPACITOR C142 on JB 1
# 01897945 35MV10UGX CHEMICAL CAPACITOR C163 on JB 1
INDUCTOR, COIL, FILTER
12449370 SBT-0160W EMI FILTER L117 on JB 1
12449381 SBT-0460TF (TP) EMI FILTER L101-L111 on JB 11
12449445 ESD-R-16C FERRITE-CORE 1
CRYSTAL, RESONATOR
00891801 MA-406 24.000MHZ CRYSTAL X1 on MB 1
ENCODER
01231367 EC16B24204 (L=15) ROTARY ENCODER on EB 1
CONNECTOR
23365653 336-653 RUBBER CONNECTOR 2
13369874 IL-Z-11PL-SMTY-E1500 CONNECTOR CN2 on MB 1
13369928 53253-0610 CONNECTOR CN1 on MB 1
13369968 IL-404-17S-LW CONNECTOR CN3 on MB 1
13369942 53254-0610 CONNECTOR CN101 on JB 1
13369939 53254-0310 CONNECTOR CN103 on JB 1
SCREW
40012489 SCREW M2.6×10 BINDING TAPTITE FE BZC 1
40011223 SCREW M2.6×6 BINDING TAPTITE P NI 9
40012456 SCREW M2.6×8 BINDING TAPTITE P FE NI 6
PACKING
# 01897923 PAD ADAPTOR 1
# 01788512 PAD UPPER 1
# 01788523 PAD LOWER 1
# 01788501 PACKING CASE 1
MISCELLANEOUS
12569249S0 LITHIUM BATTERY CR2032 220MAH/3V 1
# 01898189 FOOT D10 T4 4
25095101 PRESSURE SHEET SENSOR 509-101 1
# 01892034 VR SHIELD SHEET 1
13429566 IC SOCKET 400-032-001 32P 1
12569420 LITHIUM BATTERY HOLDER (HL32-A2) FOR CR2032 1
ACCESSORIES (STANDARD)
00899078 AC ADAPTOR BRC-100 1
00899089 AC ADAPTOR BRC-120 1
00899090 AC ADAPTOR BRC-230 1
00899101 AC ADAPTOR BRC-240A 1
00905234 EURO CONVERTER PLUG ECP01-5A (PLUG FOR BRC-230T) 1
# 71238145 OWNER'S MANUAL JAPANESE 1
# 71238223 OWNER'S MANUAL ENGLISH 1

DR-770 Feb. 1999
6
LOADING THE FACTORY
PRESET DATA
1. Turn off the power to the DR-770.
2. While simultaneously pressing the [RESET] and [REC] buttons
turn the power on.
3. The display will show “INIT?”.
4. Press the [ENTER] button and the display will show “SURE?”.
NOTE : If initialization is not necessary do not press the [ENTER]
button.
Press the [STOP/EXIT] button. The display will show “Aborted”
and the operation will enter normal mode.
5. Press the [ENTER] button again. The DR-770 is loaded the
Factory preset Data and then the display will show “Done”and
the operation will enter normal mode.
IDENTIFYING THE VERSION
NUMBER
1. While simultaneously pressing the [SONG] and Numeric
button [7] turn the power on.
The version number will appear on the LCD display as shown
below . The displayed version of number is ROM (IC8 on Main
Board) 's version number.
2. When pressing the Numeric button [8], the display will show
“INIT ?”.
Then press the [ENTER] button the display will show
“SURE?”. If you want to initialize the DR-770 press the
[ENTER] botton again.
The display will show “Done”and the operation enters normal
mode.
If not initializing, press the [STOP/EXIT] button. The display
will show “Aborted”and the operation enters normal mode.
The displayed date differs depending on the ROM version.
USER DATA SAVE AND LOAD
To save the data stored in the RAM of the mainframe (DR-770) in
an external memory or load external MIDI.
Methods of transmitting and receiving data are explained below.
NOTE : If loading is executed all data stored in the RAM of the
mainframe will be lost.
NOTE : If you select “ALL”and execute the Bulk Dump, the
memory on the receive device will be full before the Bulk Dump is
completed, not being able to receive any more data.
If this happens, change the data to be transferd to “SEQ,”
“GLOBAL,”“DRMKITS,”or “1DRMKIT,”then execute the Bulk
Dump again.
How to save the User Data
Connections
Procedure
1. Press [MIDI] to make “MIDI”light.
The DR-770 is now in MIDI mode.
2. Use [ ] [ ] to select “9 BULK.”
PADBANKFUNCMODE
MIDI OUT
Receive device
MIDI IN
Transmit device (DR-770)
MIDI sequencer
Computer
etc.
FUNCMODE
INSERT
COPY
DELETE
SONG
PATTERN
PAD
UTILITY
REAL
STEP
EFFECTS
MIDI
QUANTIZE
NEXT PTN
PART
BEAT
LENGTH
PATTERN
Data to be transferred

DR-770 Feb. 1999
7
3. Use [DEC] [INC] or [VALUE] to select the type of data that
will be transmitted.
ALL: All data of the DR-770
SEQ: All patterns and songs
GLOBAL: DPP/roll/metronome/MIDI settings
DRMKITS: All user drum kits
1DRMKIT: A specified individual drum kit (If this data is
transmitted to the DR-770, the drum kit that is
currently selected on the receiving device will
change to the drum kit settings that were
received.)
4. Press [ENTER].
The display will ask “Sure?,”allowing you to confirm whether
you really want to execute the bulk dump.
■If you selected “1DRMKIT,”use [DEC] [INC] or [VALUE] to
select the drum kit whose data you want to transmit.
5. To execute the bulk dump, press [ENTER].
The display will indicate “Trnsmit”(transmitting) ' “Done,”
and the bulk dump will be completed.
If you decide to cancel, press [STOP/EXIT].
The bulk dump will be canceled, and the display will indicate
“Aborted."
QUANTIZE
NEXT PTN
PART
BEAT
LENGTH
PATTERN
PADBANKFUNCMODE
MIDI OUT
Receive device (DR-770)
MIDI IN
Transmit device
MIDI sequencer
Computer
etc.
How to load the User Data
Connections
Connections
1. Press [MIDI] to make “MIDI”light.
The DR-770 is now in MIDI mode.
2. Use [ ] [ ] to select “2 MIDIch.”
3. Use [VALUE*] to select the MIDI channel.
■If you want to restore data that was formetly transmitted to a
sequencer, set the unit to the same MIDI channel that was used
when transmitting the data.
■If you want to receive data that being transmittied from another
DR-770, set both DR-770 units to the same MIDI channel.
4. Use [ ] [ ] to select “7 RxEXC.”
5. Use [DEC] [INC] or [VALUE] to turn the setting “ON.”
With playback stopped on the DR-770, receive the data.
FUNCMODE
INSERT
COPY
DELETE
SONG
PATTERN
PAD
UTILITY
REAL
STEP
EFFECTS
MIDI
QUANTIZE
NEXT PTN
PART
BEAT
LENGTH
PATTERN

DR-770 Feb. 1999
8
TEST MODE
CAUTION : When running a test item (RAM check) in the test
mode the backup data in the mainframe will be erased.
Be sure to seve the data before running this test.
To save the data refer to “DATA SAVE AND LOAD”.
Required Items
·Monitor speakers or Headphones,
·MIDI cable
·FS5U×2 (Polarity switch setting is Jack side)
·Oscilloscope
To enter test mode
While simultaneously pressing the [SONG] and [7] buttons, turn
the power on. The version number will appear on the LCD
display as shown below. The displayed date differs depending on
the ROM version.
This LCD display is referred to as the main screen in the
following procedures.
To exit test mode
On the main screen, press the [8] button.
The display will show “INIT?”.
When initializing:
Press the [ENTER] button. The display will show “Sure?”.
Press the [ENTER] button again. The display will show “Done”
and the operation will exit test mode.
When not initializing:
Press the [STOP/EXIT] button. The display will show “Aborted”
and the operation will exit test mode without initializing the
setting.
Test Items
The test mode includes the 8 tests.
0. LED check
1. Switch check
2. LCD check
3. RAM check
4. ROM check
5. MIDI check
6. FSR (Key Pads) check
7. OUTPUT check
NOTE : Each test number corresponds to the [0] to [7] keys on
numeric buttons. To begin a test, press a numeric button that
corresponds to the test number to be run.
[0]. LED check
This test checks whether the LED lights normally.
1. Press the numeric button [0] to run this test.
2. If normal, pressing the [REC] button turns on the red LED,
while pressing the [START] button turns on the green LED.
3. When pressing the [STOP/EXIT] button, the display will
show “OK”.
4. Again, press the [STOP/EXIT] button to return to the main
screen.
[1]. Switch check
This test checks whether each key (except key-pads) and the
encoder (VALUE knob) are functioning.
1. Press the numeric button [1] to run this test.
The display will show as follows:
2. When pressing a button or Foot SW to be checked, the key
name will be displayed in the “ ”field. At
the same time a rim-shot sound will be output from Outputs L
and R.
3. After all the buttons and Foot SW have been pressed for
checking, the test automatically enters the encoder checking.
The display will show as follows:
4. When turning the encoder clockwise (or counterclockwise),
the display shown at right in the figure above will appear.
Then when turning the encoder in the reverse direction, the
display will show “OK”if the encoder is functioning.
5. Press the [STOP/EXIT] button to return to the main screen.
[2]. LCD check
1. Press the numeric button [2] to run this test.
2. When this test is entered, all segments of the LCD will be
displayed.
3. When pressing the [STOP/EXIT] button, the display will
show “OK”(even if the LCD does not operate normally).
4. Again, press the [STOP/EXIT] button to return to the main
screen.
Turning the encoder
(or<<<<<<<)

DR-770 Feb. 1999
9
[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:
KSounding
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. / 1
L
TOM1
2
R
TOM2
3
IND1
TOM3
Output destination /
Sound /

DR-770 Feb. 1999
10
KEQ (IC106 on Jack Board)
4. When you press one of key-pads “5”to “7”, a rectangle wave
will be output with following EQ setting.
<Fig 1> L(MONO)
R
Pad No. 5 Pad No. 6 Pad No. 7
KPanning
5. When you press one of key-pads 13 to 15, a sine wave will be
output with the follwing panning.
<Fig 2> L(MONO)
R
Pad No. 13 Pad No. 14 Pad No. 15
6. The LCD is displayed as shown below.
7. In the “ ”field the panning state 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”.
8. When pressing the [STOP/EXIT] button, the display will
show “OK”.
9. Again, press the [STOP/EXIT] button to return to the main
screen.
Pad no. / 5
0dB
0dB
00
6
-12dB
+12dB
+12 -12
7
+12dB
-12dB
-12 +12
EQ High
EQ Low
LCD display /
Pad no. / 13
L7
14
CENTER
15
R7Panning /
(1v/div)
(2ms/div)
(1v/div)
(2ms/div)