Boss Dr. Rhytm DR-550 MK II Service Notes

)

APRIL.1992

obqss

TABLE OF

SPECIFICATIONS

EXPLODED

DR-550mk2

PRECAUTIONS

AND

PARTS LIST

BLOCK

CIRCUIT
CIRCUIT
CIRCUIT

IDENTIFYING

SETTING

DATA SAVE

TEST MODE

TROUBLESHOOTING

1C

APPENDIX

DIAGRAM

DATA

CONTENTS

VIEW

DISASSEMBLY

DESCRIPTION

BOARD(MAIN

DIAGRAM(MAIN

VERSION

FACTORY

AND LOAD

DR-550

Dr

Rhythm

ERRATA

SUPPLEMENT i

&

MK

attached at

s

n

SERVICE

DDDDDDDDDDDDDDDDDD

—

PROCEDURE

DR

550m

IJ

0

y

7s

0

mam

BOARD)

BOARD)

NUMBER

PRESETS

«KH(*-f y&fa)

A-va

7rn

h

ICx-*

u-yufey

:

E—

h

nm

the

k2

h

K

end of

7^

DR-550mk2

NOTES]

First Edition

the

page, it

}£.&

/

Page

1

2

3

4

5
5

6

7

8
8

8

9

10

11

12

SPECIFICATIONS/

•

Number of Tones/

•

Mximum Polyphony/

•

Memory

•

Tempo

•

External Data Storage/

•

External Sync/^^3

•

Output Level/

•

Noise Level/

•

Power Source/®}®

•

Battery Life/

•

Current Draw/

•

Dimensions

•

Weight

•

Accessories

•

Options

Capacity/

tht)

J

d

g

—

U

WS

>€U-

'y$

$$!§

v

X

tttH

: 91

: 12

64 Preset Patterns

:

Programmable Patterns

64

(Configuration:Scale 1 to 4, Last Step 1

Songs

8

(Max. 160

**

(

J

Audio

MIDI

Max. 6.5 Vp_p
Max. 0.35 Vp_p (Tape

Less

DC 9V, SUM-3

Approx. 9hrs. (manganese), 23hrs.

i

m

NOTE

|

si

[

90mA

188(W)

7-7/1

51

Dry cell Battery

NOTE

I

HOT]

bars/Song ,1280 bars by

1 60

/j\g&

=40

to 250

Cassette Tape

-

than

82.5 dBm (L or R)

(

-7

9

$1®

These figures will vary

|

/

ft

(L or R)

Battery

y

n

y

v

,

x

*

y

Save)

x

6 or AC Adaptor (Option)

n$y

),23

mmmmm

x

6(W)

lb. 2 oz.

0g/1

The above parts(Dry cell Battery SUM-3S) does not supply as replacement

1

parts, because it is goods.

x

157(D)

x

41

6-3/1

6(D)

(including batteries)

SUM-3S 1 .5V

(Dry cell Battery SUM-3S)

(H)mm

x

1-5/8(H)

(

to

16)

using Song Chain function)

d i

(alkaline type)

depending on the actual conditions of use.

inches

x

6pcs)

m

Owner’s Manual

Owner’s Manual Set (English) :PNo.260551 64

AC Adaptor BOSS PSA

Set (Japanese) :PNo.260551 63

Series

1 280

/j\as©a^3iiipriii

mmMUdit

L

[FRONT

Rubber

Switch

(22495241)

PANEL]

—

Display

(22045395)

LCD

RCD-1-013R

(15029506)

Cover

LED(red)

GL8PR25

5029324)

(1

Knob

(22485211)

TM-3 VR

(2216035300)

Pot.

RK14K1230

(13279966)

Spacer

50kB

Switch

SSSU11

(13159168)

x

2

Jack

-5130

YKB21

(13449433)

Jack

-5129

YKB21

(13449428)

Bottom Case
(22045428)

Ass’y

1 7059647

Top Case

(22045431)

Printed in Japan

Ass’y

B0BE (DP) 1

Copyright

© 1992

ROLAND

by

CORPORATION

-

1

0

DR-550mk2

EXPLODED

|e

No.

©

(2)

(3)

@

®

©
®

©Main

1

(§)

®

(Q)

®
®
®
®

©

-

Knob

VR

Display

Top

NOTE

1

non

Rubber

LCD

Rubber

NOTE

|

1

Main
Main

Bottom Cas

Battery

Terminal
Terminal
Terminal

Battery

Battery

Shield

PARTS

Spacer

Case Assy

|

RCD-1-013R

Board

1

jfe

|

Board Assy
Board Assy

NAME

Cover

We do

Top Cas

Switch

Connector

Replacement

Box Assy

Spring
Spring
Spring

Case

Cover

Cover

VIEW/

-

not

Assy

Main Board

(

(

(-)

supply

for

Main

(1/2)

(2/2)

/-)

+
+

)

ftf&m

the Top

LCD

Board Assy

Assy

(pcb
(pcb

-

:

separately.

Case

:

:

:

:

consists of

2

TIB©

(T

2292586803 1/2)
2292586803 2/2)

:

:

:

:

:

PARTS No.

2248521

2216035300

22045395

22045431

22495241

15029506

23365653

7316903000

following 2

the

22045427
23425822
23455182
23455180

23455181

22015963

2206521

22255299

t'o

PCBs.

| NOTEl

[WW\

removing

Before

(p.3)

V-Jimz,

Black

or

installing

the

shield

cover,

TDR-

please

550mk2

refer

”DR-550mk2

to

(p.3)

disassembly

procedure and

APRIL.1992

precautions”.

[SCREW]

(a)

2.6

x

6mm

Binding

P-tight

FeNi

2

©

W

$

DR-550mk2

Disassembly

precautions

How to

©

remove

1 . To

Remove

a)

“EXPLODED

Remove the

b)

NOTE

[

c) Use

Shield

NOTE

|

install the

2. To

Use a

a)

Cover in

NOTE

|

Install the

b)

NOTE

|

Solder the

c)

p.2).

remove/install

Shield

the

solder

the

VIEW”,

main

Refer to

|

(1/2)”,

p.3)

soldering

a

Cover from

time,

At this

|

resin.

Shield

soldering

the top

time, be

At this

|

resin.

board,

main

to “To

Refer

|

“

:Soldering

#

“Precautions

iron

Cover

iron to

case.

procedure

the

Cover

board

the top

from

p.2).

(1/2),

melt

to

case.

careful

be

melt

careful

(1/2),

install the

point”(refer to

“

•

(2/2),

when

location

not to

location

not

(2/2),

LCD”,

Shield

:Soldering

LCD and

removing

“

melt any

“

to melt

and

LCD

p.3)

and

Cover

point”

rubber

the main

”,

remove the

and

other

and install

other areas

any

switch.

rubber

“EXPLODED

(refer

switch.

areas

Shield

the

VIEW”,

board

board

main

main

the

fastened

(1/2),

board

Fig. a.)

be

(1/2).

to the

sure to

main board

remove the

removing

connectors

main board

from the

frame.

are not

(Refer to

and

rubber

remove the

you

connectors

the

into the

when

LCD

Precautions

©

2

1

/

)

(

LCD

©

The

(1/2)

LCD

To

1.

so

and

install

Insert

when

rubber

the LCD

i.

to

“

:Soldering point”(^)SEl

a)

#

Main Board

b)

\)1

~F

c)

^"©8B#(TBH&M)£n

(1/2),

“MAIN

I

$

(2/2),

BOARD(l/2)

'o

)

LCD,

(P.

diU

2)#M)

•

XT

©^EB-S-IKo

y

<D&M

£

TT$

UT^^'o

"(P.3)

£#MLT

h

l

'o

MAIN

©

LCD,

SftTl'S-tivMnN

li,

^ItT^l'o

LCD

©

l.LCD^#^(iJ6iAAT'T$l'o

BOARD

•

dU

MAIN

BOARD

(1/2)

MAIN

(1/2)

MAIN

BOARD

±*'bLCD,

(Ela#M)

BOARD

(1/2)

(1/2) fcffibftLfcB#

9-

Kt^lTT^i'o

of

of

2.

a)

b) Main

c)

\)±m\

”

“

non

la M\

“

:Soldering

#

l'o

(D$m

c

l'o

Board

“LCD

(T0#flR )

b#,

(2/2),

(1/2),

(DM

point”(

v~)l

U

^i'^?

dA

LCD,

<9

•Xd’y $

"(P.3) LT<fc*$l'o

(P.

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2)

)

ft

iz

.®ml

L TT $

1}

tt

l'o

h

)

l

'o

Fig.a

(0

a)

While

2.

slot. (Refer

between

connector

Install the

3.

Use

4.

has

pressing

to Fig. b.)

LCD and

the

and the

main board

“Test Mode

correctly installed.

been

the rubber

the

board

main

(1/2)

/ [2]

(p.9)

connector

this time, be

At

rubber

(1/2).

firmly

LCD

to the

careful

connector, or

in place.

Check” to

right,

that no

between the

confirm

insert it into

dirt comes

that the LCD

the

rubber

Fig.b

2.

b)

(0

3.MAIN BOARD

4. LCD

•

d\L

(0b#M)

d'-U

LCD

t

BOARD

MAIN

t

SfcffiftLTTSi'o

*9

L

(P.

Z)<IE

9) /

[2]

<

JK

LCD

&

tzfi't'

fa

S>

TffifiiS LTT $

/

—

o

•

(1/2) iOftfri:,

(1/2) L

ft

t

©ScK",

O

J&<ft*F

ftftTTc?

“fXf

l

'o

l

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L

l

'o

•

X-

K

V

3

DR-550mk2

APRIL.1992

PARTS

PRECAUTIONS:

SAFETY

parts

The

safety-related

listed

only

Use

replacement.

:

zEjwrt'Tt'&so;!.

±mfem%T-o<

(DZ'to

38j|©85li.

#^i^l-©gBn

OICLTTSI'.

(T-Z

CASING/

22045428

BUTTON/

KNOB,

22485211

SOCKET/

JACK,

13429642
13449428
13449133

13449433

13449720

SWITCH/

XT

13159168

2495241

UNIT/BUTCi:

DISPLAY

LIST//\°-'7

have

marked

A

characteristics.

parts for

entcb

D

Top

NOTE!

I

|;j

********

22255299

Bottom

NOTE

I

I a It 1

22045427

22065210

23425822

NOTE

I

a

I

22015963

23455182
23455180

23455181

Display

7?/,

Knob

y

r

M-S2-3P

YKB21-5129

HLJ052

YKB21-5130

HEC-2305-0

SSSU11

Rubber

ttfi6b4'l

0

MB(1/2)
MB(2/2)

Case Assy

ft I

M.

-j

(7 -

'

<fc

->

MAIN

->

MAIN

Replacement

do

We

Case

Top

Top

Shield

Case Assy

Replacement

|

Bottom

Bottom

Battery

Battery

Replacement

|

Battery

I

Battery

Terminal

Terminal
Terminal

Cover

V

Uhr-j h

1-01-1

10

1-250

Switch

not

Case

®*©#8&l**!5

Case

Cover

Case

Cover

BOARD
BOARD

Top

supply

Bottom

Case

Box

Battery

Box

Case

Spring
Spring

Spring

1

When

Failure to

even

fcLKAiift.

to

Assy ii,

Assy

'JXF

CONSIDERATIONS

ASSY

ASSY

Case

the Top

Assy IT.

Assy

(

(

(-)

ordering

Ex.

completely

undelivered

#j)

(1/2)(pcb
(2/2)(pcb

Assy

TIB®

£&«*/<>

Assy

Case

Box Assy

14, TIB©

/-)

+

+

)

DIN

monaural
monaural

Power

any

QTY

consists

Case

2 SRStSifiX

12©

T

Switch

ON

parts listed

10
15

the above

fill

replacement.

i&TTK®

10
15

2292586803

2292586803

of the

separately.

consists

3 S

consists

4

ORDERING

PARTS

In the

NUMBER

PART

22575241

2247017300

Items

4 liIBficSBA

22575241

2247017300

1/2)

2/2)

following

ATlT

To

of the

ft

£

following

of the

ft

A

£ To

list,

parts

with

following

o

T

please

correct

parts.

2

4

]

specify the

DESCRIPTION

Knob

number

LTT

Knob

4'*'

£

parts.

3

parts.

Sharp

£(.'<>

Sharp

o fc

following

key

(orange)

description

and

(WMil&O

key

(orange)

IK

Items In

MODEL

will

the order

C-20/50

DAC-15D

In

result

C-20/50

DAC-1

MIDI

TAPE

OUTPUT

PHONES

For Using

sheet.

NUMBER

delayed or

5D

<Jtto

IN

SAVE/

L,R

AC

LOAD

adaptor

ASSY

PCB

7316903000

m

15199803
15239138

15209372

15279521

15259886N0

15259883

15259720T0

15289701

15289107
15199216

15289401

15289124

TRANSISTOR/

8$g:rEfiici5i

/

Main

NOTE

I

I WWI

Main
Main

PD753

U

MB87604PF-G-BND

MB838000-20P-G-3B5

SRM2264LM-

PD74HCU04G-E2

U

TC7S00F

TC74HC74F-T2

PD6376GS

U

M5218FP

LM2931Z-5.0

SC17710YDA

PC-400

177/7/-

2SC2412KR

Assy

Board

Replacement

[

frfitITIj

Board Assy (1/2)

Board Assy (2/2)

16GF-237-3B9

Main

Board

10T

TE85L

SOP

T1

T-146

Main Board

Assy

2292586803 1/2)

(pcb

2292586803 2/2)

(pcb

(Flat/Taping)

(Flat/

(Chip/ Taping)

(Flat)

(Flat)

(Flat/Taping)

(Chip/

(Flat/

(Chip/

14,

Assy

TIB®

Taping)

Taping)

Taping)

Taping)

consists

2

of

the

ft

£

following 2

£ To

Mask CPU

Array

Gate

MASK ROM

8M

CMOS

H-CMOS

Gate

1

CMOS

Converter

D/A

Amp

Op.

+ 5V Voltage

+

3V Voltage

Photo

PCBs.

S-RAM

Inverter

Hex

CMOS NAND

Flip Flop

D-Type

Regulator
Regulator

(Opto-Isolator)

Coupler

(Wave

Rom)

MB

IC1 on

on MB

IC2

on MB (1/2)

IC3

on MB (1/2)

IC5

MB

on

IC6

MB

IC4 on

on MB (1/2)

IC8

on MB (2/2)

IC103

IC104,IC105

on

IC101

on MB (2/2)

IC102

on MB (1/2)

IC7

Q1,Q2,Q3

Q101 on

(1/2)
(1/2)

(1/2)
(1/2)

on MB (2/2)

MB

(2/2)

on MB (1/2)

MB

(2/2)

4