Roland KR-55 Service Notes

Feb.
1990
KR-55
KR-55
DIGITAL
KEYBOARD
First Edition
SPECIFICATIONS/f±^
Keyboard 76keys, E to C, SK-776-C
Sound Generation RS-PCM Sound Generation
(max. 30 voice)
Output Power
1
0W
x
2
Preset Voices 23
Group
64 Voice
Effects
Chorus, Reverb
Speakers
16cm
x 2,80
Power Consumption 100V
45W
117V
45W
220V, 240V
70W
Dementions 1158(W) x 394(D) x
108(H)mm
45-5/8 X 15-1/2 X 4-1/4 inch
Weight 16kg/35lb 3oz.
Accessories
Options
••
Music Rest
;
22195634
AAC
Cord(detachable/^fla^)
100V
117V
220V
240V-E
240V-A
Pedal Switch
1
343981 6F0
1343981
2 FO
1343981 3 FO
23495110
1
343981 4F0
DP-2
r
117/220/240V
^
only
Owner's Manual (Japanese)
:
26035559
Owner's Manual
(English):
26035560
Stand: KS-30
(
1 1
7/220/240V)
KS-35 (100V)
Pedal Switch: DP-6
Pedal Switch: DP-2
Expression Pedal: EV-5, EV-10
Handy Pad: PAD-5
Music Rest
(22195634)
Panel
(22215687)
Key
Felt
(22265492)
Side Panel R
(21125318)
Plate
R
(22125255)
Side Panel
L
(21125319)
Plate L
(22125254)
Keyboard Assy
SK-776-C
(7623820000)
Blind
(21145384)
Jack
YKB-2 1-5006
(13449252)
Phones PCB
Holder
(22205193)
Bottom
(21135229)
[^Roland
Printed
in
Japan
AI-2 (CR)
1
TABLE
OF CONTENTS Page
SPECIFICATIONS
DISASSEMBLY
KEYBOARD
SK-776-C
PARTS LIST
DISASSEMBLY
CIRCUIT
DIAGRAM
SK-776
AW
CONTACT BOARD
(32P)
SK-776
AW
CONTACT BOARD
(44P)
PARTS
LIST
BLOCK DIAGRAM
CIRCUIT
DIAGRAM
(MAIN
BOARD)
MAIN BOARD
JACK BOARD/CARD BOARD/PHONES BOARD
CIRCUIT
DIAGRAM
(JACK
BOARD)
CIRCUIT
DIAGRAM (CARD BOARD)
CIRCUIT
DIAGRAM (PHONES BOARD)
SWITCH BOARD
CIRCUIT
DIAGRAM (SWITCH BOARD)
PRIMARY
BOARD
CIRCUIT DIAGRAM (PRIMARY BOARD)
PS-AMP
BOARD
CIRCUIT
DIAGRAM
(PS-AMP BOARD)
TEST
MODE
TROUBLESHOOTING
CHECKING JACK BOARD
PEDAL
DP-6
STAND
KS-35
STAND
KS-30
PEDAL
DP-2
IC
DATA
i±m
1
2
SK-776-C 2
/N"-'y
• F
2
3
instill
5
SK-776
AW
CONTACT BOARD
(32P) 5
SK-776
AW CONTACT BOARD
(44P) 5
6
7
[5]S§|2]
(MAIN
BOARD)
8
MAIN
BOARD
9
JACK BOARD/CARD BOARD/PHONES BOARD
12
UliE^lIl
(JACK BOARD)
13
EliE^lIl
(CARD BOARD)
13
[aS§[21
(PHONES BOARD)
13
SWITCH BOARD
14
m^m
(SWITCH BOARD)
14
PRIMARY
BOARD
15
lllS^El
(PRIMARY BOARD)
15
PS-AMP
BOARD
16
ElSIlIi
(PS-AMP BOARD)
16
xX
F
•
K
17
h "7 37 JU
*
V
—
X
T
>
20
JACK BOARD
(7)^^ 22
DP-6 22
37
>
K KS-35 23
37
>
K KS-30 24
^37";u dp-2 24
ICx
—
25
Copyright
©
1990 by
ROLAND CORPORATION