28
&
Service Manual
• Parts side of MAIN PCB
000
423-675
40
39
1
2
12V
12V
PTM
GND
GND
5V
LF
1.5V
POWER
(MR-16HD)
POWER
(MR-8HD)
DRIVE
ANALOG
3.3V
1.8V
N.C.
TXD
RXD
BOOT
3.3V
5V
GND
GND
GND
RESET
(from S-ROM)
PROGRAM
FOOT
SW
SPDIF OUT
MIDI OUT
USB HOST
USB DEVICE
JTAG
11
7
KEY
KEY
MR-16HD(17P)
MR-8HD(30P)
M
R-8HD(25P)
M
R-16HD(30P)
447012
PROGRAM
(from PC)
PCB,MAIN,MR-8HD/CD
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
C24
C25
C26
C27
C28
C29
C30
C31
C32
C33
C34
C35
C36
C40
C41
C42
C43
C37
C38
C46
C47
C48
C50
C51
C52
C62
C49
C55
R41
C57
C58
C59
C60
C61
C98
C97
C1
14
C65
R18
C67
C44
C69
C71
C72
2
1
7
8
J4
C39
C83
C82
C70
C75
C76
C77
C85
16
J1
1
R173
C84
D7
D8
D9
R105
C107
C74
30
1
J50
30
1
J51
J52
R50
R59
E7
R52
L1
L2
L7
R57
R58
C99
D5
R53
R55
D6
R106
R107
U18
U27
R1
10
R1
11
R1
12
R1
13
R1
14
R1
15
R116
1
2
10
9
J1
J6
1
6
J54
R9
C54
C64
C102
U1
1
2
8
9
10
11
12
13
14
15
16
17
18
19
20
3
4
5
6
7
YW
VU
T
R
PN
M
L
KJ
H
G
F
E
D
C
B
A
U25
1
15
U26
U28
U29
C81
J2
1
2
20
19
U36
C95
C96
R171
R172
E3
C63
C100
C89
C103
C104
C101
C105
D1
D2
D3
D10
1
2
3
4
X1
C45
L33
R13
R174
R175
R103
U12
R176
R19
R49
D4
C90
R54 R56
Q1
R8
R61
R63
R91
R92
R83
U17
R48
L3
W8
J5
J7
1
2
J10
R93
R94
C86
C79
R97
C87
L19
L20
L21
L22
L23
L24
R84
R86
R87
R88
R89
R104
R102
5
1
U39
R1
R2
R3
R4
R5
R6
R7
R10
R11
R12
R14
R15
R16
R17
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R38
R39
R40
8
1
U2
R42
R43
R44
R45
R46
R47
R60
1
U3
R62
R64
R65
R66
1
U13
R51
R67
R68
R69
R70
R71
R72
R73
R74
R75
R76
R77
R78
R79
1
U14
1
U19
1
U30
1
U31
1
U32
1
U33
1
U34
1
U35
W1
W2
W3
W4
W5
W6
W7
9
U4
1
R90
R101
S1
1
28
U5
1
28
U6
U7
U8
U9
U10
U15
U16
U40
U20
U21
U22
U23
U24
5
1
U38
C91
C92
C94
C53
C106
C80
C56
C66
C68
C73
C88
C78
C93
E6
J8
J9
L30
L31
L32
R80
R81
R82
R85
R95
R98
R99
R100
X4