BOSS DR 550 SERVICE NOTES

Page 1

Mar.1990

DR-550

I
@ans DR-55O ISEIWIGE NHTESl TABLE OF CONTENTS M Page
I
D". Rhythm F irst Edition EXPLODED VIEW 5mm 2
ECIFICATION DR-550 DISASSEMBLY PROCEDURE DR-550 fifigjfif/EE 3
SP AND PRECAUTIONS
Number of Tones : 48 types PARTS L|ST /\°---J U z |~ 4
(WEéEfi) Maximum Polyphony : 12 (fitfiiflfifiéfi: 12)
Memory Capacity : 64 Preset Patterns, 64 Programmable Patterns BLOCK D|AGRAM 7 El "J 7g 5
(Configuration : Scale 1~4, Lasl Slep 1~16) _
: 8 Songs (8&9) CIRCUIT DESCRIPTION Efigfigifi 5
(Max, 160 bars/Song, Max.1280 bars by using Song Chain function)
(Rt 160 Il\§fi/E 1 >9 hi VfiifiéififilLTIUHZSO/hfifiwiiifiiiéfiifié) MAIN BOARD X f 75% 6
Tempo : J:40~250
External Data Storage : Audio Cassene Tape CIRCUIT DIAGRAM (MAIN BOARD) [336$] (X4 ygfli) 7
(51% ¥ 'J -) I w ~ = »
Exernal Sync : MIDI IDENTIFYING VERSION NUMBER [\"-V 3 /®EEEI§H}£ 8
(fififix V7 DEE) _,, . z .
Outpur Level : Max 6.5 VpAp (OUTPUT L or R) DATA SAVE AND LOAD 7-5012-7 & EI- MDT-iii 8
(I'i'J'Jl/Nll) Maxi 0.35 V91) (Tape Save) _ v
Noise Level : Less than -825d8m (OUTPUT L or R) TEST MODE 72 LE.- I 9
Power Source : DC 9V.Battery SUM>3S x 6pcs.(6 $) or AC Adaptor (Oplion) - . 3 _ -- 2 v
Battery Life : Approx. 9hrs.(manganese), Approx, 23hrs.(alkaline type) :These figures wiIl vary depending on TROUBLESHOOTING LOGIC TREE L 7 7 lb J :L T 4 /7 1 O
the actual conditions of use. .m-
fiiQfiIuI (vvfiviflhx iiJZSWFsfi (7/WJJEEIE) : Elfiifiififlfiwilfi [G DATA '0 T 7 1 1
fi;;;t,,'j"w 3 9° 8 DC 9V CHANGE INFORMATION Eifiw 12
Dimensions : 188 (W) x 157 (D) x 41 (H) mm \ W I - _ fl _ : 12
7-3/8 (W) x 6-3/16 (D) x 1-5/8 (H) inch APPENDIX (Error message) {1% ( 7 X J1: /)
Weight : 5109 (liltéfic) / 1 lb. 2 02, (including banenes)
Accessories : Dry cell SUM-33 (12569105) x 6 pcsr(621§)
Owners Manual (Japanese) : 26035919
Owner's Manual (English) : 26035920
Options : AC Adaptor BOSS PSA Series (PSA-100,120,220 or 240)
-LCD Cover
(22045222)
FRONT PANEL LCD LED REAR PANEL
ROD-1 -013R GL8PR25 (red)
(15029506) (15029324)
-Switch
SSSU11
(131 59168)
- Jack -Jack
YKB21- 5130 YK821>5129
. Knob :- (13449433) (13449428)
(2248521 1) 1
TM~3 VR Spacer Top Case Ass'y-I OPEFEOZUSEM w NES a mom YADESAE/LDAD WIN
(2216035300) (22015975) I W" 0 0 O °°°°°
Pol.
- C
RK14K1230 50kB x 2 "- $31295:
(13279966) /
R bb '
(5243:6253? Jack- 3 - D'N 3
HEC-O470-O1-63O HLJ0521-01-110 M-SZSP
(13449711) (13449133) (13429642)
Top Case Assy
(22015976)
@Roland Printed in Japan BD-2 (DP) 1 Copyright © 1990 by ROLAND CORPORATION

Page 2

DR- 550 Mar.1990

EXPLODED VIEW (fifiglfl)

_ PARTS _ Note: Before removing or installing the shield cover, please refer to DR-550 disassembly
® 22485211 Knob 113375 rocedure and recautions". .3 . (
® 2216035300 TM-3 VR Spacer XN-Ur- 2}: 9-19 nae EYU 5A1: DR-550 \
© 22045222 LCD Cover LCDhN-
@ 22015976 Top Case Ass'y lw77-17Efifirfi:
NOTE: Top Case Ass'y consists of the following 2 parts. l,
ii : |~v 77-Xfifiiaéltt "FEEZEllE'u/J\BEEU§?°
tam Top Case l~ ~y 77-1
NOTE: We do not supply the top case separately.
33 : lwy 77-zobwfiefil35 U iii/w
® 22255299 Shield Cover 9-» Hs":
© 22495241 Rubber Switch 310:4 w 5'-
© 15029506 LCD RCD- 1 ~013R
® 23365653 Rubber Connector 1123*? 9- for LCD
for LCD
7315703001 Main Board Ass'y X 4 Vétfifimfl

NOTE: Replacement Main Board Ass'y consists of the following 2 PCBs.
ii : fififii} 4 Vgflififilifilit TEEmZEbE/wafilt) i3}

Main board (1/2) (pcb 2292586802 1/2)
Main Board (2/ 2) (pcb 2292586802 2/2)

(9 22015959 Bottom Case 7R bAr-X
® 23425822 Battery Box Assy imam 25355261:
NOTE: Battery Box Assy consists of the following 4 parts.
3 : imfiyaze-eazaim TEEw4EBE-im5filwid'o
® 23455182 Terminal Spring (+/-) fi¥/\* (+/-)
(12! 23455180 Terminal Spring (+) P޴/\'* (+)
03 23455181 Terminal Spring (-) ޴/\'* (-)
® 22015963 Battery Case fiffl/Ky71
® 22045223 Battery Cover Eitjfi'

-SCREWS'
2.6x6mm Binding Head P-tight FeNi

Bottom Case removal screws (D x 7pcs. W