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)

DR-770 Feb. 1999
11
TROUBLESHOOTING
qNo sound is produced.
possible causes
The volume is set to minimum.
The level of the key-pads is set to zero.
The selected Rhythm Pattern or Song contains on data.
wSound breaks.
possible causes
More than 14 voices are being played simultaneously.
Assign Type for the key-pads is not properly set.
eSound is strange.
possible causes
The settings for the key-pads are inappropriate.
rThe Roll/Flam effect is not produced.
possible causes
The Flam Interval is set to zero.
The settings for the Flam Ratio are inappropriate.
tPlayback does not begin when [START] button is pressed.
possible causes
The Sync Mode is set to MIDI.
The selected Rhythm Pattern or Song contains no data.
ySongs automatically play one after another.
possible causes
The song chain function is ON.
uThe tempo changes when a song starts playing.
possible causes
An internal tempo is being set.
iThe DR-770 cannot be controlled by an external MIDI
device.
An external MIDI device cannot be controlled by the DR-
770.
possible causes
The MIDI channels of the DR-770 and the external MIDI
device do not match.
Note numbers of the DR-770 and the external MIDI device do
not correspond.
oWhen the DR-770 is played by performance data from a
sequencer, the song on the DR-770 starts together.
possible causes
The Sync Mode is set to MIDI sync.
!0 The metronome does not sound.
possible causes
The level of the metronome is set to zero.
!1 Program Change messages cannot be transmitted or
received.
possible causes
“4PRG’in the MIDI Mode is set to OFF.
!2 The volume does not change when MIDI Volume messages
are received.
possible causes
“5RxVOL”in the MIDI mode is set to OFF.
!3 The volume does not change when MIDI Expression
messages are received.
possible causes
“6RxEXPR”in the MIDI mode is set to OFF.
!4 The DR-770 cannot receive Exclusive messages.
possible causes
“7RxEXC”in the MIDI mode is set to OFF.
MIDI channels are not set to the same number.

DR-770 Feb. 1999
12
ERROR MESSAGE
If you attempt an incorrect operation or if an operation could not be
executed, the display will indicate an error message. Refer to this
list and take the appropriate action.
●No more patterns can be recorded.
❍Press [STOP/EXIT]. If you want to continue recording patterns,
you must first delete unneeded patterns. (p. 62)
●No more songs can be recorded.
❍Press [STOP/EXIT]. If you want to continue recording songs,
you must first delete unneeded songs. (p. 67)
●During pattern editing, using “Copy Pattern”or “Delete
Pattern,”the selected pattern contained no data.
❍Press [STOP/EXIT], then select a different pattern.
●During song editing, using “Insert Pattern”or “Delete Pattern,”
the selected pattern contained no data.
❍Press [STOP/EXIT], then select a different part.
●During song editing, using “Copy Song”or “Delete Song,”the
selected song contained no data.
❍Press [STOP/EXIT], then select a different song.
●An excessive amount of MIDI data was received all at once, and
the DR-770 was unable to process it.
Press [STOP/EXIT],
❍If this message appears while receiving data, reduce the amount
of MIDI data that is being transmitted to the DR-770.
❍Change the MIDI mode setting so unnecessary MIDI messages
are not transmitted or received. (p. 87)
●An exclusive message could not be received correctly.
❍Press [STOP/EXIT], then try the operation once again.
●The memory backup battery inside the DR-770 has run down.
(This message will appear when the power is turned on.)
❍Replace the battery as soon as possible. For battery
replacement, please contact a Roland Service Center.
●The data in internal memory has been lost. (This message will
appear when the power is turned on.)
❍After this message is shown, “Press ENTER”appears, then
pressing [ENTER] will recall the factory settings.

DR-770 Feb. 1999
13
BLOCK DIAGRAM
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V

DR-770 Feb. 1999
14
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
CIRCUIT DIAGRAM (JACK)
IND
1
L/MO
NO
R
PHONES
AC14V
To Main Board
CN2
To Main Board
CN1
MIDI IN
MIDI OUT
FO
OT SWITCH
ENC Board
VR Board
To ENC Board
CN201
To VR Board
CN301
To Jack Board
CN 103
To Jack Board
CN 101
Jack Board
A
A
A
A
A
A
A
A
D
A
A
A
A
A
VREF 4.0V
VREF 4.0V
VREF 4.0V
A
D
D
A
A
+
5
D
+
5
D
+
5
D
+
5
D
A +8
A
A +8
A
A +8
A
VREF 4.0V
D
D
D
D
D
D
A +8
A
+
5
D
+
5
D
A
VREF 4.0V
A
A
A
A +9
+
5
D
D
A
A
A
VREF 4.5V
D
VREF 4.0V
A
A
A
D
D
A
A
C115
10/16
L106
SBT-0460
R127
22(1/2W)
C133
47/16
L107
SBT-0460
C128
47/16
R132
22(1/2W)
Q101
DTC343TK
1
2 3
Q103
DTC343TK
1
2 3
L103
SBT-0460
Q102
DTC343TK
1
2 3
C127
0.0033
C119
0.0033
L105
SBT-0460
L104
SBT-0460
C101
10/16
C114
10/16
R107
10k
C110
150p
R126
56k
CN301
WIRING HARNESS C
1
1
2
2
3
3
4
4
5
5
6
6
C118
150p
C117
150p
+
-
IC102B
UPC4570
6
5
7
C120
0.033
CN201
WIRING HARNESS B
1
1
2
2
3
3
R125
1k
C126
150p
R118
56k
R110
3.3k
C123
10/16
JK106
HEC0740-010-10
2
1
3
+
-
IC101A
UPC4570
2
3
1
CN103
53254-0310(3P)
1
1
2
2
3
3
R113
18k
C122
10/16
C108
10/16
L110
SBT-0460
C121
2.2/25
R124
3.3k
R119
56k
C112
0.033
C125
150p
R116
3.3k
R115
3.3k
R117
1k
C106
100p
R123
3.3k
L109
SBT-0460
C107
0.033
R109
3.3k
R111
1k
L111
SBT-0460
R120
56k
JK105
YKB21-5130
1
2
3
CN101
53254-0610(6P)
1
1
2
2
3
3
4
4
5
5
6
6
R112
56k
C111
0.0033
L102
SBT-0460
R105
1k
R134
3.3k
R106
18k
R102
10k
C135
0.0033
R128
3.3k
R103
1k
R104
10k
C132
0.1
C131
0.1
C130
0.1
A
B
E
N
EN201A
EC16B24204
3
1
2
A
B
E
N
EN201B
EC16B24204
10
20
+
-
IC101B
UPC4570
6
5
7
+
-
IC103A
M5216FP
2
3
1
+
-
IC103B
M5216FP
6
5
7
+
-
IC102A
UPC4570
2
3
1
C104
100p
C105
100p
C102
100p
C103
100p
L117
SBT-0160W
1
2
4
3
D107
1SS133
1 2
D106
1SS133
1 2
D104
1SS133
1 2
D105
1SS133
1 2
C150
0.47
C147
2.2/25
C149
0.022
C148
0.022
C151
0.47
C146
2.2/25
R121
18k
C113
2.2/25
C152
0.1
IC106
M62421SP
AGND
13
CH1IN
2
SIMIN1
3
SIMOUT1
4
BASS1
5
DVDD
12
OUT1
7
AVDD
20
DGND
8
REF
1
CS
11
DAT
9
CLK
10
OUT2
14
TRE2
15
BASS2
16
SIMOUT2
17
SIMIN2
18
CH2IN
19
TRE1
6
CN104
WIRING 6P
1
1
2
2
3
3
4
4
5
5
6
6
CN102
WIRING 11P
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
1
4
2
5
3
JK108
M-S2-3P
5
2
4
JK101
HLJ7001-01-3010
1
3
4
JK102
HLJ7101-01-3010
1
3
4
JK103
HLJ7101-01-3010
1
2, 3
4
JK104
HLJ7101-01-3010
1
2, 3
4
VR301B
RK14K124 50kB *2
1
4
6
VR301A
RK14K124 50kB *2
2
3
5
VR301C
RK14K124 50kB *2
10
20
1
4
2
5
3
JK107
M-S2-3P
5
2
4
L108
SBT-0460
R144
100
R145
120
R146
220
R147
220
C129
0.0033
C155
0.033
C156
0.033
SW101A
SPUN19430A
3.6
2, 5
+
-
~
~
D102
1G4B42
2 1
4
3
+
-
IC101C
UPC4570
84
+
-
IC102C
UPC4570
84
+
-
IC103C
M5216FP
84
C153
0.1
R129
10k
C154
470/16
C136
470/25
C143
0.1
D101
MTZ8.2B
12
R135
560
R101
56k
D103
MTZ5.6C
1 2
Q106
2SC2459
3
1 2
R131
10k
R137
15(5W)
IC105
UPC24M09AHF
IN
1
OUT
3
COM
2
C142
100/16
R142
4.7k
Q104
2SA1049
3
2 1
C138
100/6.3
C139
0.1
R143
4.7k
C137
470/25
Q105
2SC2459
3
1 2
R133
10k
R130
47k
C134
47/16
C144
0.1
C140
0.1
R136
5.6(3W)
L101
SBT-0460
C158
0.1
C157
100p
C159
100p
C160
0.1
C161
100p
C162
100p
IC104
7805AHF
IN
1
OUT
3
COM
2
C163
10/35
R139
1k
R138
0(JUMPER)
To Main Board(1/2)
CHORUS
REVER
B
DRUM KIT
TEMPO
STE
P/REAL
RO
LL
PTN/S
ONG
PAD
EFFEC
T
7
8
9
4
5
6
3
2
1
MIDI
UTILITY
COPY
DELETE
V(do
wn)
0
^(
up)
ENT
ER
FWD
>(ri
ght)
BWD
<(left)
RESET
PAD BA
NK
FLA
M
REC
STAR
T
STOP/EXI
T
Main Board(2/2
)
DA4
1SS30
0
1
2
DA7
1SS30
0
1
2
SW12
1
2
DA1
1
1SS30
0
1
2
DA1
5
1SS30
0
1
2
SW5
1
2
SW20
1
2
SW28
1
2
SW36
1
2
SW35
1
2
SW27
1
2
SW19
1
2
SW11
1
2
SW4
1
2
SW3
1
2
SW
2
1
2
DA3
1SS30
0
1
2
DA6
1SS30
0
1
2
SW10
1
2
SW
9
1
2
SW1
7
1
2
DA1
0
1SS30
0
1
2
SW18
1
2
SW2
5
1
2
DA1
4
1SS30
0
1
2
SW26
1
2
SW3
3
1
2
SW34
1
2
SW1
1
2
DA
2
1SS3
00
1
2
DA
5
1SS3
00
1
2
SW8
1
2
SW1
5
1
2
DA
9
1SS3
00
1
2
SW16
1
2
DA
13
1SS3
00
1
2
SW23
1
2
SW24
1
2
SW31
1
2
SW32
1
2
SW6
1
2
SW7
1
2
SW3
0
1
2
SW2
2
1
2
SW1
4
1
2
SW29
1
2
SW21
1
2
SW13
1
2
DA
18
1SS3
00
1
2
DA1
7
1SS30
0
1
2
DA
16
1SS3
00
1
2
DA
12
1SS3
00
1
2
DA8
1SS3
00
1
2
DA1
9
1SS30
0
1
2
P0
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12

DR-770 Feb. 1999
15
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
CIRCUIT BOARD (JACK)
View from component side.

DR-770 Feb. 1999
16
CIRCUIT DIAGRAM (MAIN)
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
To Main Board(2/2)
To Jack Board
CN104
To Jack Board
CN102
To FSR
(Key-Pads)
Main Board(1/2)
P9
P5
P10
P8
P6
P11
P4
P7
P11
P10
P7
P4
P8
P2
P12
P9
P5
P6
P[12..0]
P1
P0
P3
P2
P1
P0
P3
P5
P10
P9
P6
P7
P11
P8
P12
F1
F15
F13
F7
F8
F15
F13
F6
F6
F14
F4
F1
F5
F12
F15
F10
F13
F6
F9
F10
F6 F5
F8
F7
F3
F14
F3
F1
F10
F10
F2
F3
F4
F3
F12
F7
F16
F11
F9
F12
F5
F8
F13
F9
F14
F7 F2
F11
F14
F5
F15
F2
F8
F4
F12
F2
F1
F11
F9
F4
P12
F11
F16 F16
F16
F[16..1]
WD2
WD0
WD1
WD3
WD5 WD7
WD4
WD1
WD[7..0]WD7
WD0
WD4
WD2
WD6
WA21
WD3
WD6
WD5
WD6
WD7
WD0
WD2
WD1
WD5
WD4
WD3
WA21
WA19
WA10
WA9
WA5
WA3
WA17
WA8
WA14
WA19
WA12
WA13
WA9
WA2
WA18
WA1
WA10
WA[21..0]
WA4
WA2
WA6
WA15
WA14
WA7
WA11
WA15
WA0
WA7
WA20
WA20
WA4
WA16
WA16
WA1
WA6
WA0
WA13
WA17
WA18 WA11
WA12
WA8
WA5
WA3
A2
A16 A16
A1
A7
A14
A19
A11
A5
A5
A14
A1
A18
A4
A4
A0
A16
A1
A18
A7
A21
A10
A17
A8
A7
A9
A18
A4
A2
A20
A6
A4
A3
A3
A11
A9
A12
A2
A3
A3
A0
A[21..0]
A5
A6
A13 A10
A10
A14
A6
A21
A19
A5
A12
A15
A15
A15
A13
A17
A8
A20
A0
A0
A8
A11
A2
A9
A12
A13
A0
A1
A20
A19
A17
D[7..0]
D2
D4
D5
D0
D7
D0
D3
D1
D2
D3
D2
D3
D7
D5
D1
D4
D6
D7
D7
D5
D[7..0]
D6
D0
D0
D4
D6
D0
D4
D1
D2
D2
D3
D4
D6
D5
D1
D0
D5
D5
D1
D3
D7
D1
D6
D7
D3
D4
D6
D2
ED5
ED7
ED5
ED[7..0]
ED2
ED6
ED7
ED1
ED0
ED6
ED2
ED2
ED0
ED1
ED3
ED1
ED4
ED4
ED4
ED7
ED5
ED6
ED4
ED1
ED3
ED3
ED7
ED6
ED0
ED5
ED0
ED3
ED2
+5D
D
D
+5D
+5D
D
+5D
+5D
D
+5D
D
A
BAT
D
D
D
+5D
+5D
+5D
D
+5D
D
A
D
D
A
BAT
D
D
+5D
D
D
+5D
+5D
D
D
+5D
D
+5D
+5D
D
D
+5D
D
D
D
D
DD
+5D
D
+5D
D
+5D
A
D
D
D
D
+5D
D
A
+5D
D
+5D
+5D
D
D
+5D
D
D
D
+5D
+5D
D
D
D
D
D
D
D
D
+5D
D
BAT
+5D
D
+5D
+5D
+5D
+5D
+5D
+5D
+5D
+5D
+5D
+5D
+5D
+5D
D
A
+5D
D
D
+5D
C2 0.1
C22
47/10
IC17
TC74AC138F
C
3B
2A
1
G2B
5G2A
4G1
6
Y7 7
Y6 9
Y5 10
Y4 11
Y3 12
Y2 13
Y1 14
Y0 15
VCC 16
GND
8
C21
0.1
R17
220
IC8
LH53H4100
A18
31 A17
30 A16
2A15
3A14
29 A13
28 A12
4A11
25 A10
23 A9
26 A8
27 A7
5A6
6A5
7A4
8A3
9A2
10 A1
11 A0
12
CE
22 OE
24
D7 21
D6 20
D5 19
D4 18
D3 17
D2 15
D1 14
D0 13
VPP 1
VCC 32
VSS 16
IC2F
TC74AC14AF
1312
R11
33k
C4 0.1
C25
0.1
R14
2.2M
IC18
TC7S02F
1
2
4
53
C5 0.1
C6 0.1
IC15
BU9480F
VCC 8
GND
3
LRCK
5
BCLK
7
SDAT
6
LOUT 4
ROUT 1
REF 2
BT1
(CR2032)
1 2
C13
47/16
IC2A
TC74AC14AF
12
R12
10k
R7
100k
R29
180
R25
2.2k
IC9
SED1278F0A
SEG40 63
SEG39 64
SEG38 65
SEG37 66
SEG36 67
SEG35 68
SEG34 69
SEG33 70
SEG32 71
SEG31 72
SEG30 73
SEG29 74
SEG28 75
SEG27 76
SEG26 77
SEG25 78
SEG24 79
SEG23 80
SEG22 1
SEG21 2
SEG20 3
SEG19 4
SEG18 5
SEG17 6
SEG16 7
SEG15 8
SEG14 9
SEG13 10
SEG12 11
SEG11 12
SEG10 13
SEG9 14
SEG8 15
SEG7 16
SEG6 17
SEG5 18
SEG4 19
SEG3 20
SEG2 21
SEG1 22
COM16 62
COM15 61
COM14 60
COM13 59
COM12 58
COM11 57
COM10 56
COM9 55
COM8 54
COM7 53
COM6 52
COM5 51
COM4 50
COM3 49
COM2 48
COM1 47
DB7
46 DB6
45 DB5
44 DB4
43 DB3
42 DB2
41 DB1
40 DB0
39
LP 31
XSCL 32
FR
34
DO 35
RS
36 R/W
37 E
38
OSC1
24
OSC2
25
V5
30 V4
29 V3
28 V2
27 V1
26
VDD
33
VSS
23
R27
2.2k
R22
91k
R24
2.2k
R16
220
R26
2.2k
R23
2.2k
IC3A
TC7WU04F
1
7
C18
100/6.3
IC20
M51954BFP
RST 6
DLY 5
VCC
7
GND
4
NC 1
NC 2
NC 3
NC 8
C61
1/50
R39
10k
R10
22k
X1
MA-406 24MHz
1 4
IC3C
TC7WU04F
6 2
R33
220
R28
1M
IC13
TC74HC4052
3Y
42Y
21Y
50Y
13X
11 2X
15 1X
14 0X
12
YCOM 3
XCOM 13
INH
6B
9A
10 VEE 7
VCC 16
GND 8
IC114HC4052
3Y
42Y
21Y
50Y
13X
11 2X
15 1X
14 0X
12
YCOM 3
XCOM 13
INH
6B
9A
10 VEE 7
VCC 16
GND 8
LED2
SLC-22MG
12
LED1
SLC-22VR
12
R6
330
R8
270
LCD1
RCD1627R
SEG40
1SEG39
2SEG38
3SEG37
4SEG36
5SEG35
6SEG34
7SEG33
8SEG32
9SEG31
10 SEG30
11 SEG29
12 SEG28
13 SEG27
14 SEG26
15 SEG25
16 SEG24
17 SEG23
18 SEG22
19 SEG21
20 SEG20
21 SEG19
22 SEG18
23 SEG17
24 SEG16
25 SEG15
26 SEG14
27 SEG13
28 SEG12
29 SEG11
30 SEG10
31 SEG9
32 SEG8
33 SEG7
34 SEG6
35 SEG5
36 SEG4
37 SEG3
38 SEG2
39 SEG1
40
COM16
41 COM15
42 COM14
43 COM13
44 COM12
45 COM11
46 COM10
47
COM4
53
COM9
48 COM8
49 COM7
50 COM6
51 COM5
52
COM3
54 COM2
55 COM1
56
R15
220
R4
100k
IC1A
BA10393F
3
21C1
0.1
IC1C
BA10393F
84
IC2G
TC74AC14AF
147
IC3D
TC7WU04F
84
C3
0.1
C44
220p
C41
220p
C47
220p
C38
220p
C53
220p
C32
220p
C50
220p
C34
220p
C31
220p
R34 1k
IC16
BU9480F
VCC 8
GND
3
LRCK
5
BCLK
7
SDAT
6
LOUT 4
ROUT 1
REF 2
R35 1k
R32 1k
C58
47/10
C55
0.1
IC2C
TC74AC14AF
56
CN3
11
22
33
44
55
66
77
88
99
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
R40
1k
R41
10k
R20 1k
R19 1k
R18 1k
R45
100
C57
22P
C16
0.1
C7
0.1
IC4
LH5332P00N
A20
44 A19
43 A18
2A17
3A16
34 A15
35 A14
36 A13
37 A12
38 A11
39 A10
40 A9
41 A8
42 A7
4A6
5A5
6A4
7A3
8A2
9A1
10 A0
11
*/D15 31
BYTE
33 CE
12 OE
14
D14 29
D13 27
D12 25
D11 22
D10 20
D9 18
D8 16
D7 30
D6 28
D5 26
D4 24
D3 21
D2 19
D1 17
D0 15
NC 1
VCC 23
VSS 13
VSS 32
IC12
TC551001CF-70L
A16
2A15
31 A14
3A13
28 A12
4A11
25 A10
23 A9
26 A8
27 A7
5A6
6A5
7A4
8A3
9A2
10 A1
11 A0
12
CE2
30 CE1
22 R/W
29 OE
24
I/O8 21
I/O7 20
I/O6 19
I/O5 18
I/O4 17
I/O3 15
I/O2 14
I/O1 13
NC 1
VDD 32
VSS 16
R1
10k
IC14
TC7S04F
2 4
53
C52
220p
C37
220p
C14
0.1
C40
220p
C33
220p
C20
0.1
C43
220p
C46
220p
C49
220p
C11
0.01
C62
0.1
C56
22P
C10
0.01
R9
47k
IC3B
TC7WU04F
3 5
DA1
RB715F
1
2
3
RA1
RCE9A103
1 2
3
4
5
6
7
8
9
RA3
RCE9A103
1 2
3
4
5
6
7
8
9
RA4
RCE9A223
12
3
4
5
6
7
8
9
R3
100k
R36
33k
C17
0.1
C9
0.1
C12
0.1
C15
0.1
C39
0.1
C26
0.1
C8
0.1
R5
100k
R37
4.7k
R21
1k
RA2
RCE9A103
1 2
3
4
5
6
7
8
9
RA5
CNB2B9Z3.3K
1 2
3
4
5
6
7
8
9
RA6
CNB2B9Z3.3K
1 2
3
4
5
6
7
8
9
RA7
EXBV8V103
1 8
2 7
3 6
4 5
IC5
TC6116AF
VDD 18
VDD 54
VDD 90
VDD 126
GND
19
GND
55
GND
91
GND
104
GND
127
GND
142
XMSF
114 X68
113 XE
112
CA19
66 CA18
67 CA17
69 CA16
68 CA15
70 CA14
71 CA13
74 CA12
73 CA11
76 CA10
80
CA5
75 CA4
77 CA3
79 CA2
81 CA1
84 CA0
86
CD7
85 CD6
87 CD5
89 CD4
93 CD3
95 CD2
94 CD1
92 CD0
88
RESET
99 ALE
100 DS(RD)
78
R
/W(WR)
72 CS
97
WAIT
102 GPINT
107 EXWAIT
115 INT5
111 INT4
110 INT3
109 INT2
108 GAINT
101
CS7
116 CS6
98 CS5
82 CS4
83 CS3
118 CS2
117 CS1
52 CS0
96
RSCD
53 RWWR
56 LERD
57
LD7
65 LD6
64 LD5
63 LD4
62 LD3
61 LD2
60 LD1
59 LD0
58
IOCK
103 CK
105
SC5
46 SC4
47 SC3
48 SC2
49 SC1
50 SC0
51
TEST 106
WA19 134
WA18 135
WA17 137
WA16 136
WA15 138
WA14 139
WA13 141
WA12 140
WA11 4
WA10 7
WA9 2
WA8 144
WA7 143
WA6 1
WA5 3
WA4 5
WA3 6
WA2 8
WA1 9
WA0 11
WD7 10
WD6 12
WD5 14
WD4 16
WD3 20
WD2 17
WD1 15
WD0 13
WCS7 133
WCS6 132
WCS5 131
WCS4 130
WCS3 129
WCS2 128
WCS1 125
WCS0 124
EA14 45
EA13 42
EA12 43
EA11 36
EA10 33
EA9 38
EA8 40
EA7 41
EA6 39
EA5 37
EA4 35
EA3 34
EA2 32
EA1 30
EA0 28
ED7 29
ED6 27
ED5 25
ED4 23
ED3 21
ED2 22
ED1 24
ED0 26
EWE 44
ECS 31
SD 119
SCK 121
DACA(LE) 120
DACC(MX) 122
DACB(INH) 123
IC19
MB622928PF-G-BND
EWE
1
ED0
2ED1
3ED2
4
CK
5
VSS
6
RESET
7
NC 8
SD 9
SCK 10
LE 11
VDD 12
WDTH0 13
WDTH1 14
WDTH2 15
CC
16 CR
17
VSS
18
ED3
19 ED4
20 ED5
21 ED6
22 ED7
23
VDD 24
C66
27p
DA20
1SS300
1 2
3
R44
100
IC6
HD6415108F
P32/BREQ 49
STBY
112
MD2
111 MD1
110 MD0
109
TXD2/P87
96 RXD2/P86
95
TXD1/P85
94 RXD1/P84
93
P67
80 P66
79 P65
78 P64
77 P63
76 P62
75 P61
74 P60
73
P57
72 P56
71 P55
70 P54
69 P53/FTOB2
68 P52/FTOA2
67 P51/FTOB1
66 P50/FTOA1
65
AN3/P73
86 AN2/P72
85 AN1/P71
84 AN0/P70
83
AVCC
87
AVSS
82
SCK2/IRQ3/P83
92
SCK1/IRQ2/P82
91
P81/IRQ1 90
P80/IRQ0 89
P37
54 P36
53 P35
52 P34
51 P33
50
EXTAL
98
XTAL
99
NMI 2
P47/FTCI2
63 P46/FTI2
62 P45/FTCI1
61 P44/FTI1
60 P43/TMO
59 P42/TMRI
58 P41/TMCI
57 P40/ADTRG
56
P27/A23 45
P26/A22 44
P25/A21 43
P24/A20 42
P23/A19 41
P22/A18 40
P21/A17 39
P20/A16 38
A15 36
A14 35
A13 34
A12 33
A11 32
A10 31
A9 30
A8 29
A7 28
A6 27
A5 26
A4 25
A3 24
A2 23
A1 22
A0 21
D15 19
D14 18
D13 17
D12 16
D11 15
D10 14
D9 13
D8 12
P17/D7 11
P16/D6 10
P15/D5 9
P14/D4 8
P13/D3 7
P12/D2 6
P11/D1 5
P10/D0 4
RFSH 107
RD 104
HWR 105
LWR 106
AS 103
RES
1
P31/BACK 48
P30/WAIT 47
E102
PHAI 101
VCC 55
VCC 88
VCC 108
VSS
3
VSS
20
VSS
37
VSS
46
VSS
64
VSS
81
VSS
97
VSS
100
CN1
53253-0610
1
12
23
34
45
56
6
R47
100
R49
10k
IC7
PC410
64
1
35
Q2
DTA114TK
2
3 1
Q1
DTA114TK
2
3 1
Q3
2SA1037KR
2
31
IC2E
TC74AC14AF
1110
IC2B
TC74AC14AF
34
IC2D
TC74AC14AF
9 8
C67
0.1
C68
0.1
IC10
TC55257DFL-55L
A14
1A13
26 A12
2A11
23 A10
21 A9
24 A8
25 A7
3A6
4A5
5A4
6A3
7A2
8A1
9A0
10
CS
20 WE
27 OE
22
I/O8 19
I/O7 18
I/O6 17
I/O5 16
I/O4 15
I/O3 13
I/O2 12
I/O1 11
VCC 28
VSS 14
C65
10p
R13
100k
IC1B
BA10393F
5
67
C64
10p
CN2
IL-Z-11PL-SMTY
1
12
23
34
45
56
67
78
89
910
10 11
11
MIDI IN 2
MIDI OUT 2
MIDI IN 1
ENCORDER B
MIDI OUT 1
P12
P7
P0
P2
P11
P5
P8
P6
P3
P4
P9
P1
P10
MIDI OUT 2
MIDI OUT 1
MIDI IN 2
MIDI IN 1
ENCODER B
ENCODER A
ENCORDER A
FS0
FS1
FS1
FS0

DR-770 Feb. 1999
17
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
CIRCUIT BOARD (MAIN)
View from component side.

DR-770 Feb. 1999
18
Change Information
The wiring differs depending on the serial number (the location of
the red wire is opposite). The difference between before and after
the change is as follows.
Before change
Applicable serial numbers: ZL90100 ~ ZL90199
Applicable parts #******* WIRING 11p
Wire color: red white - white
Figure 1
The connection method is as follows.
Jack board Main board
1CN102 11
1
CN2
11
No.11 of CN102 is red No.11 of CN2 is red
Figure 2
After change
Applicable serial numbers: ZL90200 ~
Applicable parts #01898989 WIRING W11
Wire color: white - white red
Figure 3
The connection method is as follows.
Jack board Main board
1CN102 11
1
CN2
11
No.1 of CN10 is red No.1 of CN2 is red
Figure 4
There is no difference in the circuit board before or after the change.
As parts for servicing, only the newer wiring (01898989 WIRING
W11) is supplied.
The jack board supplied for servicing has the newer wiring.
The older wiring was installed only on the first production lot of one
hundred units (ZL90100 ~ ZL90199).
•If you replace the jack board wiring with the newer version
(01898989 WIRING W11) on a unit with a serial number
ZL90100 ~ ZL90199, make connections using the newer
method (figure 4).
•If you retain the existing jack board and replace only the main
board of a unit with a serial number ZL90100 ~ ZL90199, make
connections using the older method (figure 2).
•If you retain the existing main board and replace only the jack
board on a unit with a serial number ZL90100 ~ ZL90199, make
connections using the newer method (figure 4).
Table of contents
Other Roland Drum manuals

Roland
Roland TD-5 Kit User manual

Roland
Roland DDR-30 User manual

Roland
Roland V-Drums TD-27KV User manual

Roland
Roland DAP-3X User manual

Roland
Roland V-Drums TD-07KVX User manual

Roland
Roland TD-4K User manual

Roland
Roland V-Drums V-Cymbal Ride User manual

Roland
Roland TR-8S User manual

Roland
Roland TD-8KV User manual

Roland
Roland V-Drums TD-6K User manual

Roland
Roland TR-8 Technical manual

Roland
Roland V-drums User manual

Roland
Roland HandSonic HPD-20 User manual

Roland
Roland V-Drums TD-17KV User manual

Roland
Roland V-Drums TD-3KV User manual

Roland
Roland TR-33 User manual

Roland
Roland CR-80 User manual

Roland
Roland V-Drums TD-30 User manual

Roland
Roland V-Compact Series Setup guide

Roland
Roland PAD-80 User manual