Roland Dr. Rhythm DR-770 Service Notes
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Roland Dr. Rhythm DR-770 Service Notes

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DR-770
Dr. Rhythm

TABLE OF CONTENTS

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
SERVICE NOTES
First Edition
Issued by RJA
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Printed in Japan AA00 (DP)

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
Feb. 1999
1

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Summary of Contents for Roland Dr. Rhythm DR-770

  • Page 1: Table Of Contents

    AC ADAPTOR BRC-240A BOSS :PNo. 00899101 EURO CONVERTER PLUG ECP01-5A :PNo. 00905234 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)

  • Page 2: Deterioration In The Conductive Coating Inside The Case

    DR-770 Feb. 1999 Deterioration in the conductive PANEL LAYOUT coating inside the case FRONT VIEW The inside of the case is coated with a conductive material. If the Display Cover DR-Knob (BLK) DR-Knob (BLK) board undergoes repeated detaching/attaching, the coating on the (01787778) (22485303) (22485303)

  • Page 3: Exploded View

    DR-770 Feb. 1999 EXPLODED VIEW [Part] PART CODE PART NAME DESCRIPTION 01787734 BOTTOM CASE 01898189 FOOT D10 T4 71238156 JACK BOARD ASSY 12449445 FERRITE-CORE ESD-R-16C 71238167 VR BOARD ASSY 71238178 ENC BOARD ASSY 01892034 VR SHIELD SHEET 71238123 MAIN BOARD ASSY (EXG) 22055165 PLATE...

  • Page 4: Parts List

    DR-770 Feb. 1999 PCB ASSY PARTS LIST 71238123 MAIN BOARD ASSY (EXG) NOTE : 'MAIN BOARD ASSY' includes the following parts. MB → Main Board Assy The parts marked # CONSIDERATIONS ON PARTS ORDERING SAFETY PRECAUTION:*1 12169388 LED SPACER LH-3-3 are new (initial When ordering any parts listed in the parts list, please specify the following items in the order sheet.
  • Page 5 DR-770 Feb. 1999 DIODE MISCELLANEOUS 15339135T0 1SS300(TE85R) DIODE DA2-DA20 on MB 12569249S0 LITHIUM BATTERY CR2032 220MAH/3V 01127489 RB715F T106 SCHOTTKY DIODE DA1 on MB 01898189 FOOT D10 T4 15039221 SLC-22VR3F LED1 on MB 25095101 PRESSURE SHEET SENSOR 509-101 15039222 SLC-22MG3F LED2 on MB 01892034 VR SHIELD SHEET...

  • Page 6: Loading The Factory Preset Data

    DR-770 Feb. 1999 LOADING THE FACTORY USER DATA SAVE AND LOAD PRESET DATA To save the data stored in the RAM of the mainframe (DR-770) in an external memory or load external MIDI. 1. Turn off the power to the DR-770. Methods of transmitting and receiving data are explained below.

  • Page 7: How To Load The User Data

    DR-770 Feb. 1999 3. Use [DEC] [INC] or [VALUE] to select the type of data that How to load the User Data will be transmitted. ALL: All data of the DR-770 Connections SEQ: All patterns and songs GLOBAL: DPP/roll/metronome/MIDI settings DRMKITS: All user drum kits MIDI OUT MIDI IN...

  • Page 8: Test Mode

    DR-770 Feb. 1999 NOTE : Each test number corresponds to the [0] to [7] keys on TEST MODE numeric buttons. To begin a test, press a numeric button that corresponds to the test number to be run. CAUTION : When running a test item (RAM check) in the test mode the backup data in the mainframe will be erased.
  • Page 9 DR-770 Feb. 1999 [3]. RAM check 2. In the “ ” field the key-pad number is displayed, and in the “ ” field the pressure value is indicated. 1. Press the numeric button [3] to run this test. An asterisk “*” is displayed when the pressure value reaches This test automatically performs the RAM check.
  • Page 10 DR-770 Feb. 1999 K EQ (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. Pad no. / EQ High -12dB +12dB EQ Low +12dB -12dB LCD display / +12 -12 -12 +12...

  • Page 11: Troubleshooting

    DR-770 Feb. 1999 !0 The metronome does not sound. TROUBLESHOOTING possible causes The level of the metronome is set to zero. q No sound is produced. possible causes !1 Program Change messages cannot be transmitted or The volume is set to minimum. received.

  • Page 12: Error Message

    (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. During song editing, using “Insert Pattern” or “Delete Pattern,” the selected pattern contained no data.

  • Page 13: Block Diagram

    DR-770 Feb. 1999 BLOCK DIAGRAM...

  • Page 14: Circuit Diagram (Jack)

    DR-770 Feb. 1999 CIRCUIT DIAGRAM (JACK) R102 D104 1SS133 R103 VR Board C102 D105 C103 VR301A 100p 1SS133 100p RK14K124 50kB *2 CN301 To Jack Board CN 101 R104 D106 JK101 1SS133 VR301B WIRING HARNESS C RK14K124 50kB *2 F O OT SWITCH R105 C104 D107...

  • Page 15: Circuit Board (Jack)

    DR-770 Feb. 1999 CIRCUIT BOARD (JACK) View from component side.

  • Page 16: Circuit Diagram (Main)

    DR-770 Feb. 1999 CIRCUIT DIAGRAM (MAIN) RCE9A103 Main Board(1/2) To Main Board(2/2) IC1A IC1C BA10393F BA10393F IC3A T C 7WU04F IC2G IC3D T C 7 4AC14AF T C 7WU04F WA [21..0] WA21 */D15 WA20 IC2A IC2F WA19 T C 7 4AC14AF T C 7 4AC14AF WA18 WA17...

  • Page 17: Circuit Board (Main)

    DR-770 Feb. 1999 CIRCUIT BOARD (MAIN) View from component side.

  • Page 18: Change Information

    DR-770 Feb. 1999 The connection method is as follows. Change Information Jack board Main board The wiring differs depending on the serial number (the location of the red wire is opposite). The difference between before and after CN102 the change is as follows. Before change Applicable serial numbers: ZL90100 ~ ZL90199 Applicable parts #******* WIRING 11p...

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