GEM Powerstation SK760 User manual

11
11
1 JJ
JJ
J
Index
Soldering point.
Male connector.
Female connector.
M/F faston connector.
Test point.
Supply voltage. Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
Flag joined with one or more flags
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12 - tel. [phone] - fax [phone]
GENERALMUSIC on the NET: http://www.generalmusic.com
Opening and Keyboard Disassembling Instructions & NOTICE
2
Layout SK760
3
Block Diagram (TRF and SWT versions)
5
6
7
8
Controls Interface & Controls Panel Board (TRF) Schematics
9
10
11
12
13
14
Controls Interface & Controls Panel Board (TRF) Pcb Layout
4
15
16
SERVICE MANUAL
L CODE: 270216 M
Warnings
with the same signal name inscribed.
Address
ATTENTION
Observe precautions when handling electrostatic sensitive devices.
Notice
Service must be carried out by qualified personnel only.Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (µ) micro symbol of capacitance value is substituted by U.
The (
Ω
) omega symbol of resistance value is substituted by E.
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8
Ω
unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.














Assembly & Wiring Connections SK760 (TRF version)
Timings Table
17
Assembly & Wiring Connections SK760 (SWT version)
76 Notes L/R Contact and Keyboard Interface Board Schematics
Power Supply (TRF Version), Phones and Midi & Controls I/O
Mixer Board (SWT Version) Schematic and Pcb Layout
Power Supply (TRF Version), Phones, Midi & Controls I/O and
20
Cpu & Sound Generator Map
Cpu & Sound Generator Schematic (Part 1/2)
Cpu & Sound Generator Schematic (Part 2/2)
A/V Interface Board Schematic (Optional Accessory)
Cpu & Sound Generator Pcb Layout
24
Layout SK880
Assembly & Wiring Connections SK880 (TRF version)
Assembly & Wiring Connections SK880 (SWT version)
Analog I/O Board Schematics
88 Notes L/R Contact and Keyboard Interface Board Schematics
Pcb Layouts
21
22
23
A/V Interface with Vocal Processor Board Schematic
25
A/V Interface and Vocal Processor Board Pcb Layouts
26
Test & Adjustment Procedure
27
(Optional Accessory)
18
Controls Interface & Controls Panel Board (SWT) Schematics
Controls Interface & Controls Panel Board (TRF) Pcb Layout
19
NOTE: The SK series is manufctured in two versions:
The TRF version has a traditional supply (transformer and pow-
er supply board with mixer).
The SWT version has a switching supply (switching unit and mix-
er board).
All the specifications remain the same, unless the mains voltage:
The TRF version has two nominal mains voltages 115Vac-60Hz
for U.S.A. or 230Vac-50Hz for CEE & other countries.
The SWT version accept all mains voltages into the range of
100-230Vac and 50-60Hz.
Spare Part List
28
FOURTH EDITION APRIL 2000

JJ
JJ
J 22
22
2
APP.
CKD
DRW
REV:
DISK:
DWG#
PRT:
PCB#
GENERALMUSIC S.p.A. ITALY
ALL RIGHTS ARE RESERVED, NO COPIES
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
Boccato
Riccobelli
Pannelli
550168
5 1/1
30/01/99
Opening Instructions
Keyboard Disassembling Instructions
K2
K1
K1
K2K2
K1
K2
K1
K2
K1
K2
K1
K2
K1
K2
K1
K2 K2 K2
K1 K1
K2 K2
K1
Opening Instructions
Disconnect the instrument from the mains.
To separate the keyboard from chassis, carefully turn the
screws marked by K1
Carefully turn the instrument over and unscrew the screws
bottom chassis from horizontal to vertical, remove the
you must remove a near natural key.
Note: To remove a sharp key before
Unlock the key appling not much strenght
Remove the key return spring
31
2
Keyboard Disassembling Instructions
TP9 (SK760)
NOTE: To remove a sharp key before you must remove the near natural keys.
Unlock the key appling not much strength
Remove the key return spring.
TP10 (SK880)
SK760 SK880
marked with the arrows.
Hold the chassis (top & bottom) tightly and turn the istru-
ment the right way up, lift off the top chassis as shown
below with care without forcing or disconnecting the cables.
(open the instrument before proceed)
, put it back horizontal, holding
top & bottom chassis move these tightly to the end of your
job table, now unscrew the screws marked with K2
to reassemble the keyboard & the chassis follow the instru-
ctions in reverse order.
Keyboard Separation

33
33
3 JJ
JJ
J
APP.
CKD
DRW
REV:
DISK:
DWG#
PRT:
PCB#
GENERALMUSIC S.p.A. ITALY
ALL RIGHTS ARE RESERVED, NO COPIES
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
Boccato
Riccobelli
Pannelli
550169
5 1/1
18/02/99
SK760 Layout
for descriptions see the REF column
on Spare Part List further on this manual.
1 2 3456718
891013 13 13 12 11 11 15 13
14 1316191313 13 16
17 16 16 16 1613
18 20 214 23 22 28 26 27 393837 31 32 33 34 35
8 8 43 44 45 46 47 48 49 50 52 24 25 29 30 36 4951
1

JJ
JJ
J 44
44
4
APP.
CKD
DRW
REV:
DISK:
DWG#
PRT:
PCB#
GENERALMUSIC S.p.A. ITALY
ALL RIGHTS ARE RESERVED, NO COPIES
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
Boccato
Riccobelli
Pannelli
550170
5 1/1
18/02/99
SK880 Layout
for descriptions see the REF column
on Spare Part List further on this manual.
53 23 54 55 6756
891013 13 13 12 11 11 15 13
14 1316191313 13 16
17 16 16 16 1613
56 20 21 54 23 22 28 26 27 393837 31 32 33 34 35
57 42
60 61 62 63 64 65 66 67 69 24 25 29 30 36 406859
53

55
55
5 JJ
JJ
J
Pcb#315088
96
CN1
Pcb#315118
Pcb#315014
18
97
98
99
85 86 87
8
710
CN1
VR11
VR12
CN1
CN6
TO L CONTACTS BOARD
TO R CONTACTS BOARD
Pcb#315116
CN7
CN8 CN6
VR1
CN4
CN5
CN1
Pcb#315024
CN3 CN4
CN6
CN5
CN7
CN11 CN13
CN3
Pcb#315092/1
CN7
CN4
CN2
2MB DRAM
CN1
CN10
Pcb#315150
CN15 VR1
SIMM17
SIMM18
2MB DRAM
CN8
CN16
CN6
CN3
CN9
88
Pcb#315163
LCD ADJ
CN2
89
CN11
CN1
83
CN3
6 84
CN2
26 37
CN5
CN4
CN2
Pcb#315113
CN1
CN3
CN5
CN4
CN2
CN1 CN12
90 91
CN1
8MB DRAM
9293
VR101
Pcb#315112
TO DISPLAY
CN3
82
CN5
TO DISPLAY
CN4
CN6
81 80 3
70
41
71
MOD. ADJ
PITCH ADJ
72 73 74
38 75 77 76
APP.
CKD
DRW
REV:
DISK:
DWG#
PRT:
PCB#
GENERALMUSIC S.p.A. ITALY
ALL RIGHTS ARE RESERVED, NO COPIES
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
BOCCATO
RICCOBELLI
PANNELLI
550171
5 1/1
22/02/99
SK760 ASSEMBLY
for descriptions see REF column
on Spare Part List further on this manual.
Pcb#315114
CN6
CN1
TOUCH
AFTER
AFTER TOUCH
ADJ 93
Pcb#315149
92
79 78
1
40
72

JJ
JJ
J 66
66
6
TO L CONTACTS BOARD
TO R CONTACTS BOARD
89
CN1
Pcb#315163
96
CN1
Pcb#315118
18
Pcb#850-9541-M
TB1
100 101
Pcb#315151
TB2 CN2
CN1
CN6
VR1
CN3
CN5
CN7 CN4
CN8
LCD ADJ
102
103
97
98
99
78
41
70
71
10 6
VR12
VR11
CN1
CN2
CN1
84 83 26
CN11
37
CN5
CN3
CN4
CN2
Pcb#315113
MOD. ADJ
PITCH ADJ
3873 74 75
APP.
CKD
DRW
REV:
DISK:
DWG#
PRT:
PCB#
GENERALMUSIC S.p.A. ITALY
ALL RIGHTS ARE RESERVED, NO COPIES
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
BOCCATO
RICCOBELLI
PANNELLI
550172
51/1
22/02/99
SK760 (SWT) ASSEMBLY
for descriptions see REF column
on Spare Part List further on this manual.
CN1
AFTER TOUCH
Pcb#315024
CN4CN3
CN5
CN6 CN7
CN1
Pcb#315114
CN6
Pcb#315150
SIMM17
SIMM18
92
CN3
CN1
2MB DRAM
CN11
CN7
CN4
CN13
CN3
Pcb#315092/1
CN2
CN6
CN2
CN5
CN1
CN4
CN15
2MB DRAM
8MB DRAM
90 91 93
CN12
CN8
VR1
CN10
CN16
ADJ
TOUCH
AFTER
93 92 1
82
CN6
TO DISPLAY
CN1
81
Pcb#315169
CN3
TO DISPLAY
CN4
VR101
CN5
CN6
Pcb#315088
80 3 79
113
77 72
Pcb#315149
78
40

77
77
7 JJ
JJ
J
Pcb#315116
Pcb#315123
112
56
Pcb#315014
CN7
CN8
85
CN3
CN9
8786 88
TO L CONTACTS BOARD
TO R CONTACTS BOARD
CN4
CN5
CN3
CN6 CN7
Pcb#315024 CN1
APP.
CKD
DRW
REV:
DISK:
DWG#
PRT:
PCB#
GENERALMUSIC S.p.A. ITALY
ALL RIGHTS ARE RESERVED, NO COPIES
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
BOCCATO
RICCOBELLI
PANNELLI
550173
5 1/1
23/02/99
SK880 (TRF) ASSEMBLY
for descriptions see REF column
on Spare Part List further on this manual.
NATURAL KEYS
AFTER TOUCH
SHARP KEYS
AFTER TOUCH
CN
Pcb#315119
CN
CN
CN16
CN2
CN4
CN11
Pcb#315092/1
VR1
CN5
CN7
CN4
CN1
Pcb#315150
CN15
CN13 VR1
2MB DRAM
CN3 CN10
SIMM17
SIMM18
CN2
CN6
CN1
CN2
CN6
LCD ADJ 89
CN3
CN1 CN5
CN4
CN12
2MB DRAM
8MB DRAM
9190 9293
CN8
AFTER TOUCH
ADJ 111 110 53
78
Pcb#315163
10 684
VR11
CN1
VR12
70105
57 107 MOD. ADJ
PITCH ADJ 106
80
CN11
CN1
83 26 37
CN1
82 81
CN3
CN2 CN5
CN4 CN6
CN2
CN3 Pcb#315113
CN1
CN4
CN5
TO DISPLAY Pcb#315112
VR101
TO DISPLAY CN6
Pcb#315149
Pcb#315088
379 78
73 38 75
74 77 76 97108 59 109 105 40

JJ
JJ
J 88
88
8
75
89
TO L CONTACTS BOARD
TO R CONTACTS BOARD
Pcb#315123
56 112 102
TB1
Pcb#850-9541-M
100 101
Pcb#315151
TB2
CN1
CN6
CN2
VR1
CN3
CN5
LCD ADJ
CN7 CN4
CN8
107
78
105
57 70
6
103 10
CN1
VR11
VR12
83 26 37
84
Pcb#315163 CN1 CN11
CN2
CN3
CN2
CN4
CN5
Pcb#315113
MOD. ADJ
PITCH ADJ 106 73 38 74
APP.
CKD
DRW
REV:
DISK:
DWG#
PRT:
PCB#
GENERALMUSIC S.p.A. ITALY
ALL RIGHTS ARE RESERVED, NO COPIES
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
BOCCATO
RICCOBELLI
PANNELLI
550174
51/1
23/02/99
SK880 (SWT) ASSEMBLY
for descriptions see REF column
on Spare Part List further on this manual.
CN3 CN7
CN5
CN4
CN6
Pcb#315024 CN1
92
Pcb#315150
CN11 CN13
Pcb#315092/1
CN4
CN7
CN3
2MB DRAM
CN15
CN3
CN2
CN2
CN6
CN1
CN1 CN5
CN4
CN12
2MB DRAM
8MB DRAM
9190 93
VR1
CN10
SIMM18
CN8
CN16
SIMM17
AFTER TOUCH
ADJ
Pcb#315119
SHARP KEYS
AFTER TOUCH
NATURAL KEYS
AFTER TOUCH
CN
CN
CN
53
110
111
Pcb#315169
82 81
CN1
TO DISPLAY
CN3
CN6
TO DISPLAY
CN1
CN5
CN6
VR101
80 379
Pcb#315088
CN4
77 113 108
78
Pcb#315149
59 97 105 109 40

99
99
9 JJ
JJ
J
PCB#
APP.
CKD
DRW
REV:
DWG#
DISK: PART:
GENERALMUSIC S.p.A. ITALY
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
ALL RIGHTS ARE RESERVED, NO COPIES
BLOCK DIAGRAM
SK760 - SK880 (TRF)
G. Pannelli
N. Riccobelli
G. Boccato
25/02/99
5
550175
1/1
PCB#
APP.
CKD
DRW
REV:
DWG#
DISK: PART:
GENERALMUSIC S.p.A. ITALY
WRITTEN CONSENT BY GENERALMUSIC.
OR REPRODUCE THIS DOCUMENT WITHOUT
ALL RIGHTS ARE RESERVED, NO COPIES
BLOCK DIAGRAM
SK760 - SK880 (SWT)
G. Pannelli
N. Riccobelli
G. Boccato
25/02/99
5
550176
1/1

JJ
JJ
J 1010
1010
10

1111
1111
11 JJ
JJ
J
GENERALMUSIC S.p.A. Italy
SCHEMATIC DIAGRAM SK760/880
Power Supply (TRF), Phones and Controls
& MIDI I/O Board Pcb Layouts
DRW: BOCCATO
APP: PANNELLI REV: 25-02-99
DISK: 5 PART: 1/1CKD: RICCOBELLI
ALL RIGHTS ARE RESERVED, NO COPIES OR
REPRODUCE THIS DOCUMENT WITHOUT
WRITTEN CONSENT BY GENERALMUSIC.
CONTROLS & MIDI I/O BOARD (PCB# 315088)
DWG: 315088/315116
POWER SUPPLY BOARD (PCB# 315116) TRF version
PHONES BOARD (PCB# 315118)
315118 / 315123
PHONES BOARD (PCB# 315123)

JJ
JJ
J 1212
1212
12
GENERALMUSIC S.p.A. Italy
SCHEMATIC DIAGRAM SK760/880
Mixer Board and Analog I/O Board Pcb
Layouts
DRW: BOCCATO
APP: PANNELLI REV: 25-02-99
DISK: 5 PART: 1/1CKD: RICCOBELLI
DWG: 315151/315117
ALL RIGHTS ARE RESERVED, NO COPIES OR
REPRODUCE THIS DOCUMENT WITHOUT
WRITTEN CONSENT BY GENERALMUSIC.
MIXER BOARD (PCB# 315151-2) SWT version.
ANALOG I/O BOARD (PCB# 315117).

1313
1313
13 JJ
JJ
J

JJ
JJ
J 1414
1414
14
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
21
43
65
87
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
23
45
67
89
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
12
3
4
5
AR3
10K X4
R51 10K
C2 100N C6 100N
TR1
BC 560
R35 FL5R
1
2345
AR1 2K2 X4
TR2
BC 560
C5 1U
R36 10K
1
2
CN1
98 10
IC1-C
74HC125
1
2345
AR4 10K X4
R38 10K
R34 FL5R
C7 1U
23 1
IC1-A
74HC125
1
2
3
4
5
6
CN7
R37 FL5R
R47 100E
R44 FL5R 56
4
IC1-B
74HC125
R12 10K
R23 2K2 R24 2K2 R52 2K2
R33 FL5R
R49 10K
R1 47E
XT1
20MHZ
R53 2K2
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
3914
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
98765432
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 2OCTAVE 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
KEYBOARDKEYBOARD SUPPLY
1
730680
CONNECTION
BOARD
PCB# 315114
2
3
MK0
BR1
BR2
BR3
BR4
BR5
BR6
BR7
MK1
MK2
MK3

1515
1515
15 JJ
JJ
J

JJ
JJ
J 1616
1616
16
A0 A3 A6 A7
A4
A5
A1
A6
A15A13 A11A12 A8A14
A2
A0
A3
A7
D1 D1 D1 D2 D2 D2 D5 D5 D5 D0 D0 D0 D7 D7 D7 D6 D6 D6 D3 D3 D3 D4 D4 D4
D1 D2 D2 D5 D5 D0 D0 D7 D7 D6 D6 D3 D3 D4 D4
D1 D1 D1 D2 D2 D2 D2 D2 D5 D5 D5 D0 D0 D0 D0 D0 D7 D7 D6 D6 D6 D3 D3 D4 D4 D4 D4 D4
D1 D1 D2 D5 D0 D7 D6 D3 D4
D1 D1 D1 D2 D2 D2 D2 D2 D5 D5 D5 D0 D0 D0 D0 D0 D7 D7 D7 D6 D6 D6 D3 D3 D3 D4 D4 D4
A12
A8
A14
A10
A9 A8 A11 A15 A13 A10 A12 A14
A15
A13
A11
A9
A2 A4 A5 A1 A0 A3 A6 A7
D1 D1 D5 D5 D7 D7 D6 D6 D3 D3
A2A4 A5
A9 A10
A1 A0 A3
A6
A7
D1
D5
D7
D3 D2
D0
D6
D4
D1 D5 D7 D6 D3 D4
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
DIR
FQ
DIR
FQ
-12V
+12V
-12V
+5V
+5V
+5V
+5V
-30V
-30V
-30V
+5V
+12V
+12V
+12V
+12V
-12V
+5V
+5V
-30V -30V -30V
-30V
-30V
-30V
-30V
-30V
+5V
-30V
-30V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V+5V
-30V
-30V
-30V
D1 4148
DL47
C5 100N
1234567
CN3
DL81 DL67
7
14
IC6-C
74HC74
C32 100N C20 100N
C8 100N
R2 1K
R20 8K2
R12 47K
R9 1K
VR101 5KB
1
2
3
4
SW31
DL77
DL44
DL87 DL88
DL59
DL90 DL92 DL89
DL61
DL86 DL91 DL79 DL97
R57 330E
DL95
DL29
DL93 DL85
DL20
R39 470E
DL100
R63 330E
DL49
1
2
3
4
SW36
1
2
3
4
SW21
1
2
3
4
SW73
1
2
3
4
SW78
1
2
3
4
SW86
1
2
3
4
SW91
1
2
3
4
SW98
1
2
3
4
SW87
1
2
3
4
SW58
1
2
3
4
SW67
1
2
3
4
SW63
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC3-A 74HC164
1
2
3
4
SW74
1
2
3
4
SW79
1
2
3
4
SW88
1
2
3
4
SW93
1
2
3
4
SW100
1
2
3
4
SW92
1
2
3
4
SW59
1
2
3
4
SW68
1
2
3
4
SW75
1
2
3
4
SW80
1
2
3
4
SW89
1
2
3
4
SW94
1
2
3
4
SW101
1
2
3
4
SW99
1
2
3
4
SW66
1
2
3
4
SW65
1
2
3
4
SW60
1
2
3
4
SW64
1
2
3
4
SW70
1
2
3
4
SW76
1
2
3
4
SW82
1
2
3
4
SW84
1
2
3
4
SW95
1
2
3
4
SW102
1
2
3
4
SW71
1
2
3
4
SW77
1
2
3
4
SW83
2
1
4
3
SW96
2
1
4
3
SW103
2
1
4
3
SW85
1
2
3
4
SW72
1
2
3
4
SW81
1
2
3
4
SW90
1
2
3
4
SW97
1
2
3
4
SW104
1
2
3
4
SW105
1
2
3
4
SW61
2
1
4
3
SW62
1
2
3
4
SW51
1
2
3
4
SW2
1
2
3
4
SW40
1
2
3
4
SW41
1
2
3
4
SW43
1
2
3
4
SW45
1
2
3
4
SW47
1
2
3
4
SW49
1
2
3
4
SW37
1
2
3
4
SW52
1
2
3
4
SW39
1
2
3
4
SW42
1
2
3
4
SW44
1
2
3
4
SW46
1
2
3
4
SW69
R19 5K6
1
2
3
4
SW50
4
8
IC1-C
TL072
C25 100N 7
14
IC9-B
74HC164
1
2
3
4
SW57
1
2
3
4
SW54
1
2
3
4
SW56
1
2
3
4
SW55
1
2
3
4
SW38
1
2
3
4
SW1
DL62 DL14 DL22 DL60
C17 100N 7
14
IC4-B
74HC164
DL68
R41 560E
DL5 DL7 DL16 DL24 DL34
R33 560E
DL19 DL10 DL1 DL38 DL65 DL55 DL50
R32 560E
DL106 DL108 DL150 DL132
R56 560E
DL117 DL125
DL12 DL3 R21 330E
R49 330E
DL58 DL56
DL96
DL6
DL73 DL71
DL156
DL15 DL23 DL33
DL41 DL37 DL27
DL94
DL48 DL39 DL35 DL25 DL17 R23 330E
R52 470E
DL40 DL36 DL26 DL18 DL9 R24 470E
R53 330E
DL70DL69
DL11 DL2
R54 470E
R17 470E
R36 470E
DL57DL114
DL63
DL84
DL107
DL136 DL64
DL115 DL123
DL133 DL124
R59 560E R47 560E R51 560E R46 560E
R45 1K
R42 560E
R50 560E
R62 560E R30 560E R27 560E R26 560E R22 560E
C13 100N
R28 560E R31 560E R34 560ER38 1K R29 560E R25 560E R18 560E
DL147DL134
DL126 DL140
DL139
R65 330E
DL122 DL129
DL146 DL148
R76 330E DL142 DL151 DL158
DL143
DL130
R79 470E
R37 470E
DL137 DL135 DL127 R77 330E DL102 DL119 DL111
DL118
DL113 DL149 DL109
R98 470E
DL162 DL160 DL120
DL110 DL101
DL152
DL74 DL52
DL145 DL138 DL128 DL121 DL116
R95 470E
DL31DL66DL104
R96 470E
DL112 DL103 R78 330E
VR11 22K
R35 560E R48 560E R44 560E R43 560E
R40 1K
DL45
R80 560E R85 560E R89 560E
R10 10K
C2 100N
R3 10KR11 10K
DL159 DL53
C6 100N
R4 10K
C7 100N
C9 100N C3 100N
C1 100N
R1 1K
VR12 22K
R87 560E R81 560E
DL78
R92 560E R88 560E R86 560E
DL28
R55 1K
C26 1N
DL72
R84 1K
C14 100N C16 100N C18 100N C19 100N C22 100N C21 100N C10 100N C11 100N
C28 10U 7
14
IC5-B
74HC164
R15 1K
C23 10U
TR1
BC
173C
TR2
BC
173C
R16 1K
PITCH BENDER
10KB
C24 10U
R5 5K6
C12 100N
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC9-A 74HC164
DL80 DL144
R90 470E
DL105
S1
VR4 10KB
7
14
IC8-E
74HC86 7
14
IC2-B
74HC164
VR5 10KB
C29 100N
VR6 10KB VR7 10KB VR8 10KB
7
14
IC3-B
74HC164
VR9 10KB
VR10 10KB
VR1 10KB VR2 10KB
MODULATION
10KB
1
23456789
D0 D2
AC2
220P X8
R8 1K
C4 100N
2
3
1
IC1-A TL072
R83 18K
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
CN4
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
CN5
DL157 R93 560E
1
98765432
AC1
220P X8
1
2
3
4
SW3
1
2
3
4
SW8
C27 100N
6
5
7
IC1-B TL072
C30 100P
1
2
3
4
SW13
C35 100P
1
98765432
AC3
220P X8
R72 100E
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC2-A 74HC164
R71 100E
DL32
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC4-A 74HC164
R97 560E
R67 100K
R68 100K
R75 470E
DL83
DL21
DL54
DL13
DL46
DL51
R66 470E
DL98
DL4
DL43
DL154
R94 470E
R91 330E DL155 DL141
DL42 DL131 DL30
1
2
3
4
SW18
R64 470E
DL8
R74 22K
C33 100P
DL99
C34 100P
C38 820P
11
12
1310
8
9CK
D
RS
Q
Q
D FF
IC6-A 74HC74
1
2
3
4
SW25
3
2
14
6
5CK
D
RS
Q
Q
D FF
IC6-B 74HC74
R69 1K
R70 1K
11
12
1310
8
9CK
D
RS
Q
Q
D FF
IC7-A 74HC74
R73 22K
16 15
14 13
12 11
10 9
87
65
43
21
CN2
C37 820P
4
5
6
IC8-D 74HC86
1
2
3
IC8-A 74HC86 SW53
9
10
8
IC8-C 74HC86
C36 100N
1
2
3
4
SW33
1
2
3
4
SW4
1
2
3
4
SW9
1
2
3
4
SW14
R60 560E
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC5-A 74HC164
R99 560E R58 220E R61 220E
DL163 DL161 DL75 DL82 DL76
12
13
11
IC8-B 74HC86
3
2
14
6
5CK
D
RS
Q
Q
D FF
IC7-B 74HC74
R13 1K
R7 1K
R6 8K2
1
2
3
4
SW48
1
2
3
4
SW19
1
2
3
4
SW22
1
2
3
4
SW26
1
2
3
4
SW29
1
2
3
4
SW34
7
14
IC7-C
74HC74
D2 4148
1234567
CN6
VR3 10KB
1
2
3
4
SW5
1
2
3
4
SW10
1
2
3
4
SW15
1
2
3
4
SW20
C31 100N C39 100N C15 100N
1
2
3
4
5
6
7
8
9
CN1
R14 47K
1
2
3
4
SW6
2
1
4
3
SW23
2
1
4
3
SW27
2
1
4
3
SW30
2
1
4
3
SW35
1
2
3
4
SW11
1
2
3
4
SW16
1
2
3
4
SW28
DL153
R82 470E
1
2
3
4
SW7
1
2
3
4
SW12
1
2
3
4
SW17
1
2
3
4
SW24
1
2
3
4
SW32
+
DRUMS
LEFT SIDE
G.BOCCATO
CONTROLS PANEL BOARDS
550182
+
BOARD
F2
F3
H.D. LED
BASS ACC 1/3
25/02/99
ACC 4/6 LOWER 2 LOWER 1 UPPER 2 UPPER 1 M.VOL. MC/LINE
CONTRAST
DIAL
-
-
INTRO
JAZZ US.TRAD TRAD 1 TRAD 2 LATIN 1
CHASSIS
GROUND
LATIN 2
MOD. CENTER ADJ.
USER 3 USER 4
PITCH CENTER ADJ.
LEFT CONTACTS MYLAR STRIP 140527
DIAL
SONG.P
140528 RIGHT CONTACTS MYLAR STRIP
P.GROUPS 5 P.GROUPS 6 P.GROUPS 7
KEY START
ENDING
D.HOLD
ST.LOCK
P.GROUPS 1 P.GROUPS 2 P.GROUPS 3
FILL
ENTER
P.GROUPS 8 P.GROUPS 4
UNDO D.HOLD KEY PAD 1/EFFECTS 4/CNT/PADS 2/MIDI 3/MIXER RECORD ST/SONG SCORE
SEQUENCER
7/ST/SONG 8/OPTION 9/GENERAL 5/T. SPLITS SONG STOP PLAY
SEQUENCER
-/DEMO 0/PRELOAD +/DISK 6/SOUND
BASS
KEY PAD
GUITAR
ORGAN
STRINGS ENSEMB
RECORD ST/SONG SONG
REED
BRASS
PIPE
SYN LD.
SYL PAD SYL SFX
ETHNIC
PERC.
SFX
PAD 2 PAD 1 PAD 3 PAD 4
OCTAVE - OCTAVE + TRANSP b TRANSP #
PIANO
VAR.1
STYLE REAL TIME
VAR.4 VAR.3 VAR.2
FILL
FILL
DIAL
ESCAPE
INTRO
START/STOP
PIPEARRANGE MEMORY
ARRANGE ON/OFF LOWER MEMORY ARRANGE MODE SOLO TEMPO LOCK MIXER LOCK LOWEST SINGLE BASS TO ON/OFF
STOP
PLAY
STYLE REAL TIME
SEQUENCER
PRELOAD START
STORE PERF. EFFECTS BYPASS TCH PLAY HARMONY 8 BEAT 16 BEAT ROCK FUNK DANCE 1 DANCE 2
FADE I/O
EN_LED
USER 1
STOP
F4
F5
F6
F7
F8
TRACK SCROLL
A
B
C
D
E
F
G
H
RIGHT SIDE
TO INTERFACE
>
<
F1
ST.LOCK KEY START ENDING TRANSP b
1/1
TRANSP #
USER 2
315112/315113/CS032001
FILL FILL FILL VAR 3 VAR 2 VAR 1 VAR 4 FADE I/O ARR.MEMORY LOW. MEMORY ARR. MODE TEMPO LOCK MIXER LOCK BASS TO LOWEST
HARMONY ON/OFF
ARR.ON/OFF EFF.BYPASS SOLO SINGLE TCH PLAY STORE PERF. VOL.MIN VOL.MAX
PCB# 315112
HELP
810309 - CONTROLS PANEL BOARD
FROM C.P. INTERFACE BOARD CN1
FROM C.P. INTERFACE BOARD CN3
TO CONTROLS PANEL INT. BOARD CN2
VOLUMES
D2
D0
D6
D4
A12
A8
A14
A10
A4
A5
A1
A6
A2
A0
A3
A7
D1
D2
D5
D0
D7
D6
D3
D4 A15
A13
A11
A9
D1
D5
D7
D3
POT1
POT1
+5V+5V +5V
+5V
+5V
+5V
+12V
+5V
-12V
+5V
-12V
+5V
+5V+5V
+5V
-30V
+5V
+5V +5V
-30V -30V
+5V
+5V
+12V
+12V
-12V
TR2
BC173C
D14 4148
D15 4148
D16 4148
R2 100E
D11 4148
D4 4148
D3 4148
D12 4148
D7 4148
D8 4148
R3 100E
R4 100E
R6 100E
R5 100E
R1 100E
R36 100E
R37 100E
R47 100E
C13 100N
R48 100E
R27 100E
R26 100E
R9 10K
R53 560E
C32 100P
R62 1K
R40 1K
R41 100K
R55 1K
R51 1K
R17 1K
R20 1K
R19 1K
R23 1K
R16 1K
R22 1K
C7 100N
C16 100N
C29 100N
C25 100N
R15 1K
C23 100N
R39 100K
C10 100N C8 100N
R28 100E
C5 100N C3 100N C4 100N C6 100N C9 100N
R61 1K
R60 10K
C17 100N C18 100N C28 100N
R43 1K
C27 100N C26 100N
R14 3K3
1234 CN4
C30 100N C1 100N
C31 33P
R45 1K
C21 100N
R38 100K
R57 1K
R50 1K R12 10K
R31 1M
R63 100E
7
14
IC1-E
74HC125
R33 100E
R34 100E
R35 100E
TR3
BC
327
21
30
IC3-C
VALIS100740
R46 100E
R29 10K
R65 10K
R32 2K2 R25 2K2
R44 1K
R49 100E
R52 100E
R10 3K3
R11 10K
R64 1K
R13 3K3
R59 1K
C19 100N
R66 1K
C14 100N
R24 3K3
C24 100N
R42 100E
1
23456789
AR1
10K X8
R54 560E R56 10K
R8 330E
R58 560E
R7 330E
C22 100N
16 48
3914
IC3-B
VALIS100740
98 10
IC1-C
74HC125
4
15
13
12
11
7
85
2
6
1
16
19
18
17
A0
A1
LE
MULTIPLEXER
DEMULTIPLEXER
A2
XC
X1
X2
X3
X4
X5
X6
X7
X0
E1
E2
IC4-A 74HC4351
TR1
BC327
23
1
IC1-A
74HC125
56
4
IC1-B
74HC125
121113
IC1-D
74HC125
R18 1K
R30 100E
D13 4148
C39 100N
1
5342
AR3 10K X4
4
15
13
12
11
7
85
2
6
1
16
19
18
17
A0
A1
LE
MULTIPLEXER
DEMULTIPLEXER
A2
XC
X1
X2
X3
X4
X5
X6
X7
X0
E1
E2
IC2-A 74HC4351
1
2345
AR2 2K2 X4
XT1
20MHZ
16
15 14
13 12
11 10
98
76
54
32
1
CN2
1
3
5
7
9
11
13
15 16
14
12
10
8
6
4
2
CN6
1
2
3
4
5
6
7
8
9
10
11
12
CN5
C38 10U C37 100N
C33 100N C34 10U
C35 100N C36 10U
C20 100N
R21 4K7
C15 100N C2 100N 910
20
IC4-B
74HC4351 910
20
IC2-B
74HC4351
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
P4,0/ADTRG//IRQ2
P4,1/IRQ1
P4,2/IRQ0
P4,3/RD
P4,4/WR
P4,5/AS
P4,6/CLK0
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
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
P7,0/AN0
P7,1/AN1
P7,2/AN2
P7,3/AN3
P7,4/AN4
P7,5/AN5
P7,6/AN6
P7,7/AN7
D1/P3,1
D2/P3,2
D3/P3,3
D4/P3,4
D5/P3,5
D6/P3,6
D7/P3,7
D0/P3,0
IC3-A VALIS100740
1
23456789
AC1
47P X8
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
EN_LED
CN1
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
DIR
FQ
CLK
SD
VEE
VLCD HD_LED
CN3
D2 4148
D1 4148
D6 4148
D5 4148
D9 4148
D10 4148
C12 100N C11 10U
PCB# 315113
FOOTSW2
VEE
GET_TXD
FQ
A0
A1
A2
A3
RXD3
+5V
-30V
FROM CONTROLS PANEL BOARD CN2
PEDAL V.
MODULATION
MULTIPLEXER
KB
PEDAL V.
PEDAL3
BAUD RATE3
FOOTSW3
TO CONTROLS PANEL BOARD CN5
TO CONTROL PANEL BOARD CN4
FROM CPU & S.G. BOARD CN2
CONTROLS PANEL PITCH BEND
TXD3
POT.9
POT8
POT7
POT6
POT5
POT4
POT3
M.VOL.
VOLUMES
HD LED
NEXT
PEDAL2
FOOTSW2
PEDAL1
FOOTSW1
RSTV
DIR
POT1
PEAK-1
LCD DISPLAY NEON-LAMP SUPPLY
FOOTSW3
FOOTSW1
700VAC
1c
8c
8c
C3 15P
3000V
0VAC
(300Vac w/load)
900c
C2 100N 160V
Q1
2SC2383
Q2
2SC2383
L1 1MH
R1 5K6
R2 5K6
R3 0E
SP1 0.5A FAST
C1 47U
+12V
GND
1
2
3
4
P1
SERVICE NOTE:
NC
NC
730246 - DC-AC CONVERTER BOARD
TO 240X64DOTS LCD DISPLAY
PCB CS032001
THE TECHNICAL SUPPORT IS CARRIED OUT ONLY
BY REPLACEMENT THE COMPLETE BOARD.
LGND
+12V
CONTROLS PANEL SUPPLY
PEAK-2
LGND
761135 - CONTROLS PANEL INTERFACE BOARD
GET_TXD
VLCD
FROM POWER AMP. & SUPPLY BOARD CN5
POT2
MODULATION
PITCH_BENDER
100740 - PERIPHERIAL CPU
RICCOBELLI
PANNELLI
5SK760/880 (TRF)
(TRF Version)

1717
1717
17 JJ
JJ
J
GENERALMUSIC S.p.A. Italy
SCHEMATIC DIAGRAM SK760/880
Controls Panel with its Interface and
Keyboard Interface Board Pcb Layouts
DRW: BOCCATO
APP: PANNELLI REV: 28-07-97
DISK: 5 PART: 1/1CKD: RICCOBELLI
ALL RIGHTS ARE RESERVED, NO COPIES OR
REPRODUCE THIS DOCUMENT WITHOUT
WRITTEN CONSENT BY GENERALMUSIC.
CONTROLS PANEL BOARD (TRF)(PCB# 315112) (reverse layout)
DWG: 315112/113
KEYBOARD INTERFACE BOARD (PCB# 315024)
CONTROLS PANEL INTERFACE BOARD (PCB# 315113) 315024

JJ
JJ
J 1818
1818
18
A0 A3 A6 A7
A4
A5
A1
A6
A15A13 A11A12 A8A14
A2
A0
A3
A7
D1 D1 D1 D2 D2 D2 D5 D5 D5 D0 D0 D0 D7 D7 D7 D6 D6 D6 D3 D3 D3 D4 D4 D4
D1 D2 D2 D5 D5 D0 D0 D7 D7 D6 D6 D3 D3 D4 D4
D1 D1 D1 D2 D2 D2 D2 D2 D5 D5 D5 D0 D0 D0 D0 D0 D7 D7 D6 D6 D6 D3 D3 D4 D4 D4 D4 D4
D1 D1 D2 D5 D0 D7 D6 D3 D4
D1 D1 D1 D2 D2 D2 D2 D2 D5 D5 D5 D0 D0 D0 D0 D0 D7 D7 D7 D6 D6 D6 D3 D3 D3 D4 D4 D4
A12
A8
A14
A10
A9 A8 A11 A15 A13 A10 A12 A14
A15
A13
A11
A9
A2 A4 A5 A1 A0 A3 A6 A7
D1 D1 D5 D5 D7 D7 D6 D6 D3 D3
A2A4 A5
A9 A10
A1 A0 A3
A6
A7
D1
D5
D7
D3 D2
D0
D6
D4
D1 D5 D7 D6 D3 D4
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
DIR
FQ
DIR
FQ
-12V
+12V
-12V
+5V
+5V
+5V
+5V
+5V
+12V
+12V
+12V
+12V
-12V
+5V
+5V
+5V
-30V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V+5V
D1 4148
DL47
C5 100N
1234567
CN3
DL81 DL67
7
14
IC6-C
74HC74
C32 100N C20 100N
C8 100N
R10 1K
R39 8K2
R22 47K
R13 1K
VR101 5KB
1
2
3
4
SW31
DL77
DL44
DL87 DL94
DL59
DL92 DL90 DL89
DL61
DL86 DL91 DL79
DL99
DL95
DL3
DL93 DL85
DL12
DL98
DL49
1
2
3
4
SW36
1
2
3
4
SW21
1
2
3
4
SW73
1
2
3
4
SW78
1
2
3
4
SW86
1
2
3
4
SW91
1
2
3
4
SW98
1
2
3
4
SW87
1
2
3
4
SW58
1
2
3
4
SW67
1
2
3
4
SW63
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC3-A 74HC164
1
2
3
4
SW74
1
2
3
4
SW79
1
2
3
4
SW88
1
2
3
4
SW93
1
2
3
4
SW100
1
2
3
4
SW92
1
2
3
4
SW59
1
2
3
4
SW68
1
2
3
4
SW75
1
2
3
4
SW80
1
2
3
4
SW89
1
2
3
4
SW94
1
2
3
4
SW101
1
2
3
4
SW99
1
2
3
4
SW66
1
2
3
4
SW65
1
2
3
4
SW60
1
2
3
4
SW64
1
2
3
4
SW70
1
2
3
4
SW76
1
2
3
4
SW82
1
2
3
4
SW84
1
2
3
4
SW95
1
2
3
4
SW102
1
2
3
4
SW71
1
2
3
4
SW77
1
2
3
4
SW83
2
1
4
3
SW96
2
1
4
3
SW103
2
1
4
3
SW85
1
2
3
4
SW72
1
2
3
4
SW81
1
2
3
4
SW90
1
2
3
4
SW97
1
2
3
4
SW104
1
2
3
4
SW105
1
2
3
4
SW61
2
1
4
3
SW62
1
2
3
4
SW51
1
2
3
4
SW2
1
2
3
4
SW40
1
2
3
4
SW41
1
2
3
4
SW43
1
2
3
4
SW45
1
2
3
4
SW47
1
2
3
4
SW49
1
2
3
4
SW37
1
2
3
4
SW52
1
2
3
4
SW39
1
2
3
4
SW42
1
2
3
4
SW44
1
2
3
4
SW46
1
2
3
4
SW69
R14 5K6
1
2
3
4
SW50
4
8
IC1-C
TL072
C25 100N 7
14
IC9-B
74HC164
1
2
3
4
SW57
1
2
3
4
SW54
1
2
3
4
SW56
1
2
3
4
SW55
1
2
3
4
SW38
1
2
3
4
SW1
DL62 DL14 DL22 DL60
C17 100N 7
14
IC4-B
74HC164
DL68
R47 560E
DL5 DL7 DL16 DL24 DL34
R29 560E
DL19 DL10 DL1 DL38 DL65 DL55 DL50
R85 560E
DL106 DL108 DL150 DL132
R65 560E
DL117 DL125
DL20 DL29 DL56 DL58
DL96
DL33
DL73 DL71
DL156
DL23 DL15 DL6
DL41 DL2 DL11
DL88
DL48 DL39 DL8 DL17 DL25
DL40 DL9 DL18 DL26 DL36
DL69
DL70
DL27 DL37 DL57DL114
DL63
DL84
DL130
DL142
DL64
DL123 DL115
DL133 DL124
R66 560E R50 560E R20 560E R30 560E
R48 1K
R41 560E
R19 560E
R69 560E R28 560E R27 560E R25 560E R40 560E
C13 100N
R44 560E R45 560E R46 560ER38 1K R84 560E R83 560E R82 560E
DL140
DL151 DL126
DL147 DL139
DL122 DL129
DL146
DL148
DL136 DL134
DL158
DL137
DL107
DL143 DL152 DL127 DL102 DL119 DL111
DL118
DL113 DL149 DL109
R79 220E
DL162 DL160 DL120
DL110 DL101
DL135
DL74 DL30
DL145 DL138 DL128 DL121 DL103 DL31DL66DL104 DL105 DL116
VR11 22K
R86 560E R89 560E R81 560E R88 560E
R87 1K
DL45
R43 560E R53 560E R55 560E
R15 10K
C2 100N
R34 10KR36 10K
DL159
DL53
C6 100N
R12 10K
C7 100N
C9 100N C3 100N
C1 100N
R6 1K
VR12 22K
R54 560E R52 560E
DL78
R56 560E R18 560E R17 560E
DL28
R93 1K
C26 1N
DL72
R24 1K
C14 100N C16 100N C18 100N C19 100N C22 100N C21 100N C10 100N C11 100N
C28 10U 7
14
IC5-B
74HC164
R59 1K
C23 10U
TR1
BC
173C
TR2
BC
173C
R60 1K
PITCH BENDER
10KB
C24 10U
R11 5K6
C12 100N
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC9-A 74HC164
DL80 DL144
DL112
S1
VR4 10KB
7
14
IC8-E
74HC86 7
14
IC2-B
74HC164
VR5 10KB
C29 100N
VR6 10KB VR7 10KB VR8 10KB
7
14
IC3-B
74HC164
VR9 10KB
VR10 10KB
VR1 10KB VR2 10KB
MODULATION
10KB
1
23456789
D0 D2
AC2
220P X8
R7 1K
C4 100N
2
3
1
IC1-A TL072
R16 18K
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
CN4
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
CN5
DL157 R32 560E
1
98765432
AC1
220P X8
1
2
3
4
SW3
1
2
3
4
SW8
C27 100N
6
5
7
IC1-B TL072
C30 100P
1
2
3
4
SW13
C35 100P
1
98765432
AC3
220P X8
R8 100E
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC2-A 74HC164
R9 100E
DL32
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC4-A 74HC164
R102 560E
R92 100K
R97 100K
DL83
DL21
DL54
DL13
DL46
DL51
DL100
DL4
DL42
DL154 DL141 DL155
DL43 DL131 DL52
1
2
3
4
SW18
DL35
R101 22K
C33 100P
DL97
C34 100P
C38 820P
11
12
1310
8
9CK
D
RS
Q
Q
D FF
IC6-A 74HC74
1
2
3
4
SW25
3
2
14
6
5CK
D
RS
Q
Q
D FF
IC6-B 74HC74
R95 1K
R1001K
11
12
1310
8
9CK
D
RS
Q
Q
D FF
IC7-A 74HC74
R98 22K
16 15
14 13
12 11
10 9
87
65
43
21
CN2
C37 820P
4
5
6
IC8-D 74HC86
1
2
3
IC8-A 74HC86 SW53
9
10
8
IC8-C 74HC86
C36 100N
1
2
3
4
SW33
1
2
3
4
SW4
1
2
3
4
SW9
1
2
3
4
SW14
R68 560E
3 4 5 6 10 11 12 13
9
8
2
1Q1Q2 Q3 Q4 Q5 Q6 Q7 Q8
CP
A
B
8bit Sin Pout
SHIFT REGISTER
MR
IC5-A 74HC164
R103 560E R94 220E R96 220E
DL163 DL161 DL75 DL82 DL76
12
13
11
IC8-B 74HC86
3
2
14
6
5CK
D
RS
Q
Q
D FF
IC7-B 74HC74
R58 1K
R57 1K
R35 8K2
1
2
3
4
SW48
1
2
3
4
SW19
1
2
3
4
SW22
1
2
3
4
SW26
1
2
3
4
SW29
1
2
3
4
SW34
7
14
IC7-C
74HC74
D2 4148
1234567
CN6
VR3 10KB
1
2
3
4
SW5
1
2
3
4
SW10
1
2
3
4
SW15
1
2
3
4
SW20
C31 100N C39 100N C15 100N
1
2
3
4
5
6
7
8
9
CN1
R23 47K
1
2
3
4
SW6
2
1
4
3
SW23
2
1
4
3
SW27
2
1
4
3
SW30
2
1
4
3
SW35
1
2
3
4
SW11
1
2
3
4
SW16
1
2
3
4
SW28
DL153
1
2
3
4
SW7
1
2
3
4
SW12
1
2
3
4
SW17
1
2
3
4
SW24
1
2
3
4
SW32
+
DRUMS
LEFT SIDE
G.BOCCATO
CONTROLS PANEL BOARDS
550185
+
BOARD
F2
F3
H.D. LED
BASS ACC 1/3
25/02/99
ACC 4/6 LOWER 2 LOWER 1 UPPER 2 UPPER 1 M.VOL. MC/LINE
CONTRAST
DIAL
-
-
INTRO
JAZZ US.TRAD TRAD 1 TRAD 2 LATIN 1
CHASSIS
GROUND
LATIN 2
MOD. CENTER ADJ.
USER 3 USER 4
PITCH CENTER ADJ.
LEFT CONTACTS MYLAR STRIP 140527
DIAL
SONG.P
140528 RIGHT CONTACTS MYLAR STRIP
P.GROUPS 5 P.GROUPS 6 P.GROUPS 7
KEY START
ENDING
D.HOLD
ST.LOCK
P.GROUPS 1 P.GROUPS 2 P.GROUPS 3
FILL
ENTER
P.GROUPS 8 P.GROUPS 4
UNDO D.HOLD KEY PAD 1/EFFECTS 4/CNT/PADS 2/MIDI 3/MIXER RECORD ST/SONG SCORE
SEQUENCER
7/ST/SONG 8/OPTION 9/GENERAL 5/T. SPLITS SONG STOP PLAY
SEQUENCER
-/DEMO 0/PRELOAD +/DISK 6/SOUND
BASS
KEY PAD
GUITAR
ORGAN
STRINGS ENSEMB
RECORD ST/SONG SONG
REED
BRASS
PIPE
SYN LD.
SYL PAD SYL SFX
ETHNIC
PERC.
SFX
PAD 2 PAD 1 PAD 3 PAD 4
OCTAVE - OCTAVE + TRANSP b TRANSP #
PIANO
VAR.1
STYLE REAL TIME
VAR.4 VAR.3 VAR.2
FILL
FILL
DIAL
ESCAPE
INTRO
START/STOP
PIPEARRANGE MEMORY
ARRANGE ON/OFF LOWER MEMORY ARRANGE MODE SOLO TEMPO LOCK MIXER LOCK LOWEST SINGLE BASS TO ON/OFF
STOP
PLAY
STYLE REAL TIME
SEQUENCER
PRELOAD START
STORE PERF. EFFECTS BYPASS TCH PLAY HARMONY 8 BEAT 16 BEAT ROCK FUNK DANCE 1 DANCE 2
FADE I/O
EN_LED
USER 1
STOP
F4
F5
F6
F7
F8
TRACK SCROLL
A
B
C
D
E
F
G
H
RIGHT SIDE
TO INTERFACE
>
<
F1
ST.LOCK KEY START ENDING TRANSP b
1/1
TRANSP #
USER 2
315169/315113/CS032001
FILL FILL FILL VAR 3 VAR 2 VAR 1 VAR 4 FADE I/O ARR.MEMORY LOW. MEMORY ARR. MODE TEMPO LOCK MIXER LOCK BASS TO LOWEST
HARMONY ON/OFF
ARR.ON/OFF EFF.BYPASS SOLO SINGLE TCH PLAY STORE PERF. VOL.MIN VOL.MAX
PCB# 315169
HELP
810674 - CONTROLS PANEL BOARD
FROM C.P. INTERFACE BOARD CN1
FROM C.P. INTERFACE BOARD CN3
TO CONTROLS PANEL INT. BOARD CN2
VOLUMES
D2
D0
D6
D4
A12
A8
A14
A10
A4
A5
A1
A6
A2
A0
A3
A7
D1
D2
D5
D0
D7
D6
D3
D4 A15
A13
A11
A9
D1
D5
D7
D3
POT1
POT1
+5V+5V +5V
+5V
+5V
+5V
+12V
+5V
-12V
+5V
-12V
+5V
+5V+5V
+5V
+5V
+5V +5V
-30V
+5V
+5V
+12V
+12V
-12V
TR2
BC173C
D14 4148
D15 4148
D16 4148
R2 100E
D11 4148
D4 4148
D3 4148
D12 4148
D7 4148
D8 4148
R3 100E
R4 100E
R6 100E
R5 100E
R1 100E
R36 100E
R37 100E
R47 100E
C13 100N
R48 100E
R27 100E
R26 100E
R9 10K
R53 560E
C32 100P
R62 1K
R40 1K
R41 100K
R55 1K
R51 1K
R17 1K
R20 1K
R19 1K
R23 1K
R16 1K
R22 1K
C7 100N
C16 100N
C29 100N
C25 100N
R15 1K
C23 100N
R39 100K
C10 100N C8 100N
R28 100E
C5 100N C3 100N C4 100N C6 100N C9 100N
R61 1K
R60 10K
C17 100N C18 100N C28 100N
R43 1K
C27 100N C26 100N
R14 3K3
1234 CN4
C30 100N C1 100N
C31 33P
R45 1K
C21 100N
R38 100K
R57 1K
R50 1K R12 10K
R31 1M
R63 100E
7
14
IC1-E
74HC125
R33 100E
R34 100E
R35 100E
TR3
BC
327
21
30
IC3-C
VALIS100740
R46 100E
R29 10K
R65 10K
R32 2K2 R25 2K2
R44 1K
R49 100E
R52 100E
R10 3K3
R11 10K
R64 1K
R13 3K3
R59 1K
C19 100N
R66 1K
C14 100N
R24 3K3
C24 100N
R42 100E
1
23456789
AR1
10K X8
R54 560E R56 10K
R8 330E
R58 560E
R7 330E
C22 100N
16 48
3914
IC3-B
VALIS100740
98 10
IC1-C
74HC125
4
15
13
12
11
7
85
2
6
1
16
19
18
17
A0
A1
LE
MULTIPLEXER
DEMULTIPLEXER
A2
XC
X1
X2
X3
X4
X5
X6
X7
X0
E1
E2
IC4-A 74HC4351
TR1
BC327
23
1
IC1-A
74HC125
56
4
IC1-B
74HC125
121113
IC1-D
74HC125
R18 1K
R30 100E
D13 4148
C39 100N
1
5342
AR3 10K X4
4
15
13
12
11
7
85
2
6
1
16
19
18
17
A0
A1
LE
MULTIPLEXER
DEMULTIPLEXER
A2
XC
X1
X2
X3
X4
X5
X6
X7
X0
E1
E2
IC2-A 74HC4351
1
2345
AR2 2K2 X4
XT1
20MHZ
16
15 14
13 12
11 10
98
76
54
32
1
CN2
1
3
5
7
9
11
13
15 16
14
12
10
8
6
4
2
CN6
1
2
3
4
5
6
7
8
9
10
11
12
CN5
C38 10U C37 100N
C33 100N C34 10U
C35 100N C36 10U
C20 100N
R21 4K7
C15 100N C2 100N 910
20
IC4-B
74HC4351 910
20
IC2-B
74HC4351
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
P4,0/ADTRG//IRQ2
P4,1/IRQ1
P4,2/IRQ0
P4,3/RD
P4,4/WR
P4,5/AS
P4,6/CLK0
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
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
P7,0/AN0
P7,1/AN1
P7,2/AN2
P7,3/AN3
P7,4/AN4
P7,5/AN5
P7,6/AN6
P7,7/AN7
D1/P3,1
D2/P3,2
D3/P3,3
D4/P3,4
D5/P3,5
D6/P3,6
D7/P3,7
D0/P3,0
IC3-A VALIS100740
1
23456789
AC1
47P X8
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
EN_LED
CN1
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
DIR
FQ
CLK
SD
VEE
VLCD HD_LED
CN3
D2 4148
D1 4148
D6 4148
D5 4148
D9 4148
D10 4148
C12 100N C11 10U
PCB# 315113
FOOTSW2
VEE
GET_TXD
FQ
A0
A1
A2
A3
RXD3
+5V
NC
FROM CONTROLS PANEL BOARD CN2
PEDAL V.
MODULATION
MULTIPLEXER
KB
PEDAL V.
PEDAL3
BAUD RATE3
FOOTSW3
TO CONTROLS PANEL BOARD CN5
TO CONTROL PANEL BOARD CN4
FROM CPU & S.G. BOARD CN2
CONTROLS PANEL PITCH BEND
TXD3
POT.9
POT8
POT7
POT6
POT5
POT4
POT3
M.VOL.
VOLUMES
HD LED
NEXT
PEDAL2
FOOTSW2
PEDAL1
FOOTSW1
RSTV
DIR
POT1
PEAK-1
LCD DISPLAY NEON-LAMP SUPPLY
FOOTSW3
FOOTSW1
700VAC
1c
8c
8c
C3 15P
3000V
0VAC
(300Vac w/load)
900c
C2 100N 160V
Q1
2SC2383
Q2
2SC2383
L1 1MH
R1 5K6
R2 5K6
R3 0E
SP1 0.5A FAST
C1 47U
+12V
GND
1
2
3
4
P1
SERVICE NOTE:
NC
NC
730246 - DC-AC CONVERTER BOARD
TO 240X64DOTS LCD DISPLAY
PCB CS032001
THE TECHNICAL SUPPORT IS CARRIED OUT ONLY
BY REPLACEMENT THE COMPLETE BOARD.
LGND
+12V
CONTROLS PANEL SUPPLY
PEAK-2
LGND
761135 - CONTROLS PANEL INTERFACE BOARD
GET_TXD
VLCD
FROM MIXER BOARD CN5
POT2
MODULATION
PITCH_BENDER
100740 - PERIPHERIAL CPU
RICCOBELLI
PANNELLI
5SK760/880 (SWT)
+12V
R26 220E
+12V
R80 220E
+12V
R31 220E
+12V
R49 R37R74220E
+12V
220E
+12V
R99220E
+12V
220E
+12V
R91 220E
+12V
R1 220E
+12V
R4 220E
+12V
R63 220E
+12V
R62 220E
+12V
R90 220E
+12V
R2 220E
+12V
R5 220E
+12V
R75 220E
+12V
R61 220E
+12V
R71 220E
+12V
R42
+12V
220E
R33
+12V
220E
R73
+12V
220ER78
+12V
220E
R70
+12V
220E
R67
+12V
220E
R21
+12V
220ER72
+12V
220ER76
+12V
220E
R77
+12V
220E
R51
+12V
220E
R3
+12V
470E R64 470E
+12V
(SWT version)

1919
1919
19 JJ
JJ
J
GENERALMUSIC S.p.A. Italy
SCHEMATIC DIAGRAM SK760/880
Controls Panel Board Pcb Layout (SWT)
DRW: BOCCATO
APP: PANNELLI REV: 25-02-99
DISK: 5 PART: 1/1CKD: RICCOBELLI
ALL RIGHTS ARE RESERVED, NO COPIES OR
REPRODUCE THIS DOCUMENT WITHOUT
WRITTEN CONSENT BY GENERALMUSIC.
DWG: 315169
CONTROLS PANEL BOARD (SWT) (PCB# 315083)(reverse layout)
CONTROLS PANEL BOARD (SWT) (PCB# 315083)

JJ
JJ
J 2020
2020
20