GEM Powerstation SK760, Service Manual

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DRW
CKD
APP.
DWG#
SCHEMATIC DIAGRAM
PCB#
DSK#
REV:
PART: ALL RIGHTS ARE RESERVED, NO COPIES
OR REPRODUCE THIS DOCUMENT WITHOUT
WRITTEN CONSENT BY GENERALMUSIC.
GENERALMUSIC S.p.A. ITALY
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
4148
B A
4148
4148 4148 4148 4148
G# C C# D# D F# G F E G# A B A# F# G F E G# E C C# D# D A# B A F G F#
4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148
4148 4148 4148
4148 4148 4148
4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148
F# G
F E
C C# D# D A# B A G# C C# D# D F# G F E G# A B A# F# G F E G# A# B A
2
1
4
3
6
5
8
7
10
9
12
11
14
13
16
15
4148 4148 4148 4148
4148 4148 4148
4148
4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148 4148
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
C C# D# D F# G F E C C# D# D A#
1
2
3
4
5
6
7
8
9
AC3 470P X8
12 11
13
IC1-D 74HC125
1
2
3
4
5
AR3
10K X4
R51 10K
C2
100N
C6
100N
TR1
BC 560
R35 FL5R
1
2 3 4 5
AR1 2K2 X4
TR2
BC 560
C5
1U
R36
10K
1
2
CN1
9 8
10
IC1-C
74HC125
1
2 3 4 5
AR4 10K X4
R38
10K
R34 FL5R
C7
1U
2 3
1
IC1-A
74HC125
1
2
3
4
5
6
CN7
R37 FL5R
R47
100E
R44 FL5R
5 6
4 IC1-B
74HC125
R12
10K
R23
2
K2
R24
2
K2
R52
2
K2
R33 FL5R
R49
1
0K
R1 47E
XT1
20MHZ
R53
2
K2
7
14
IC1-E
74HC125
R25 100E
C1
100N
R2 47E
R3 47E
R4 47E
R5 47E
R6 47E
R7 47E
R11 47E
R14 47E
R15 47E
R16 47E
R17 47E
R18 47E
R19 47E
R20 47E
R21 47E
R46 47E
R48 47E
R27 47E
R28 47E
R29 47E
R30 47E
R32 47E
R31 47E
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CN4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CN3
1
3
2
5
4
7
6
9
8
AC2 220P X8
1
3
2
5
4
7
6
9
8
AC1 220P X8
22
23
24
25
26
27
28
29
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
18
20
19
38
37
36
35
34
33
32
31
40
41
42
43
44
45
46
47
49
50
51
52
53
54
55
56
64
63
62
61
60
59
58
57
P7,0/AN0
P7,1/AN1
P7,2/AN2
P7,3/AN3
P7,4/AN4
P7,5/AN5
P7,6/AN6
P7,7/AN7
P4,0/ADTRG//IRQ2
P4,1/IRQ1
P4,2/IRQ0
P4,3/RD
P4,4/WR
P4,5/AS
P4,6/CLK0
D1/P3,1
D2/P3,2
D3/P3,3
D4/P3,4
D5/P3,5
D6/P3,6
D7/P3,7
A0/P1,0
A1/P1,1
A2/P1,2
A3/P1,3
A4/P1,4
A5/P1,5
A6/P1,6
A7/P1,7
A8/P2,0
A9/P2,1
P5,0/TXD
P4,7/WAIT
P5,1/RXD
P5,2/SCK
A14/P2,6
A15/P2,7
D0/P3,0
FTOA/P6,1
FTIA/P6,2
TMRI0/FTIB/P6,3
TMO0/FTIC/P6,4
TMCI1/FTID/P6,5
TMO1/P6,7
TMCI0/FTCI/P6,0
A10/P2,2
A11/P2,3
A12/P2,4
A13/P2,5
MD1
MD0
EXTAL
XTAL
STBY
NMI
RES
TMRI1/FTOB/P6,6
IC2-A VALIS100740
R45 1M
C9
100N
C4
100N
21
30
IC2-C
VALIS100740
C3
100N
16 48
39 14
IC2-B
VALIS100740
R26
10K
R9
10K
C8
100N
1
2
3
4
CN6
1
4
5
6
7
8
9
2
3
AC5 220P X8
1
9 8 7 6 5 4 3 2
AR2 10K X8
OCTAVE 5 OCTAVE 6
810557
44N RIGHT CONTACTS
BOARD
KD0
KD1
SK760 RICCOBELLI 1/1
22/02/99
CN1
PANNELLI
CONTACTS BOARD & KEYBOARD
INTEFACE BOARD
KD2
KD3
KD4
KD5
KD6
MK5
BR5
MK6
BR6
MK7
BR7
MK8
BR8
MK9
BR9
KD7
MK10
RIGHT KEYBOARD
ADDR & DATA BUS
TO KEYBOARD INTERFACE
BOARD CN3
OCTAVE 7
(76NOTES DYNAMIC KEYBOARD)
KD1
KD2
KD3
KD4
KD5
KD6
KD7
OCTAVE 2 OCTAVE 1
KD0
LEFT KEYBOARD
ADDR & DATA BUS
OCTAVE 3
BR1
BR2
310565 310566
1/1
BR10
BOCCATO
MK4
MK5
BR3
CN1
810556
32N LEFT CONTACTS
BOARD
(76NOTES DYNAMIC KEYBOARD)
TO KEYBOARD IN-
TERFACE BOARD CN4
PCB# 310565
MK0
BR0
MK1
MK2
MK3
MK6
OCTAVE 4
550180
MK7
PCB# 310566
5
MK8
MK9
MK10
BR8
315024
BR9
BR10
KD1
KD2
BR0
KD3
KD4
KD5
KD6
KD7
FROM 32 CONTACTS LEFT BOARD CN1
RIGHT KEYBOARD ADDR & DATA BUS
FROM 44 CONTACTS RIGHT BOARD CN1
KD0
4
1
2
AFTER TOUCH RUBBER STRIP
Pcb# 315024
CPU H8/329
761137
KEYBOARD INTERFACE BOARD
(SK760 Model)
LEFT KEYBOARD ADDR & DATA BUS
RXD3
NEXT
GET
FROM CPU & SOUND GENERATOR BOARD CN11
TXD3
RSTV
FROM/TO CPU & SOUND GENERATOR BOARD CN5
AT
KEYBOARD
KEYBOARD SUPPLY
1
730680
CONNECTION
BOARD
PCB# 315114
2
3
MK0
BR1
BR2
BR3
BR4
BR5
BR6
BR7
MK1
MK2
MK3