Circuit Diagram (Sw Sheet) - Boss Roland GT-8 Service Notes

Dec.2004

CIRCUIT DIAGRAM (SW SHEET)

fig.c-sw.eps
EXP BOARD
C7
0.1
ASSY 75D913S000 (6/6)
D
CN1
D+3V
WIRING 3P VR1A
RK11K1140 (10KSB)
1
1
2 12 14 2
2 DATA
3
3
3
CLOCK
DGND
ENC BOARD
ASSY 75D913S000 (5/6)
EN1A
E N
EVE GC1 F20 24B
E N
A B
A B
EN1B
EVE GC1 F20 24B
DGND
CN4
RIBON 3P (1/2)
RIBON CABLE (3P)
CN6
RIBON 3P (1/2)
D
D 3. 3 +
CN7 C9
WIRING 8P N.I.U.
1
1
2
D
2
3
3
4
4
5
5
6
6
7
7
8
8
[PRE/SP] [PRE/SP TYPE VARIATION]
SW8 D8 SW9 D9
1 2 1 2 1 2 1 2
SW_SCAN4 SKQKAB 1SS133 SKQKAB 1SS133
[DELAY FEEDBACK] [DELAY LEVEL]
SW16 D16 SW17 D17
1 2 1 2 1 2 1 2
SW_SCAN3 SKQKAB 1SS133 SKQKAB 1SS133
CN8
WIRING 13P [FX-1] [AMP CTL]
SW24 D24 SW25 D25
1 SW_SCAN4 1 2 1 2 1 2 1 2
1
2
SW_SCAN3
2
3 SW_SCAN2 SW_SCAN2 SKQKAB 1SS133 SKQKAB 1SS133
3
4
SW_SCAN1
4
5 [WRITE] [SYSTEM]
5
SW32 D32 SW33 D33
6 SW_DATA7
6
7 SW_DATA6 1 2 1 2 1 2 1 2
7
8 SW_DATA5
8
9 SW_DATA4 SW_SCAN1 SKQKAB 1SS133 SKQKAB 1SS133
9
10 SW_DATA3
10
11 SW_DATA2
11
12 SW_DATA1
12
13 SW_DATA0
13
D
R E F +3. 3
C10
CN9
N.I.U. IC4
1 HD74HC4051P
1
2
AD1
2
3 AD0 3 4
3 COM 7
4 2
AD_C
4 6
5 AD_B 5
5 + 5
6 D 3. 3 1
AD_A
6 4
7 16 12
7 VCC 3
15
2
C4 14
1
WIRING 7P 0.1
13
0
8
GND
D 9
C
10
B
11
A
7 6
VEE INH
D D
IC6
HD74HC4051P
3 4
COM 7
2
6
5
5
D 3. 3 +
1
4
16 12
VCC 3
15
2
C5
14
1
0.1 13
0
8
GND
9
C
10
B
11
A
7 6
VEE INH
D D
"1" "2" "3" "4"
+ + + +
D 3. 3 D 3. 3 D 3. 3 D 3. 3
+
D 3. 3
IC1 LED1 LED2 LED3 LED4
BU2090 (DIP)
L-34HDSL L-34HDSL L-34HDSL L-34HDSL
15
Q11
14 R1 R2 R3 R4
Q10
13
Q9 390 390 390 390
12
Q8
11
Q7
10
Q6
9
Q5
8
Q4
7
Q3
6
Q2
5
Q1
4
Q0
SW2 BOARD
ASSY 75D913S000 (2/6)
D
"1" "2" "3" "4" "CTL"
SW3 D3 SW4 D4 SW5 D5 SW6 D6 SW7
1SS133 1SS133 1SS133 1SS133
1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1
SKQKAKD010 SKQKAKD010 SKQKAKD010 SKQKAKD010 SKQKAKD010
[PRE/SP CHANNEL A] [PRE/SP CHANNEL B] [PRE/SP SOLO] [PRE/SP SPEAKER]
SW10 D10 SW11 D11 SW12 D12 SW13 D13 SW14
1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1
SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB
[CHORUS LEVEL] [REVERB LEVEL] [COMP] [EQ]
SW18 D18 SW19 D19 SW20 D20 SW21 D21 SW22
1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1
SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB
[FX-2] [MASTER] [PARAMETER LEFT] [PARAMETER RIGHT]
SW26 D26 SW27 D27 SW28 D28 SW29 D29 SW30
1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1
SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB
[FX CHAIN] [NAME] [TUNER/BYPASS] [ASSIGN CTL/EXP] [ASSIGN VARIABLE]
SW34 D34 SW35 D35 SW36 D36 SW37 D37 SW38
1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1
SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB 1SS133 SKQKAB
[11detents]
PRE/SP PRE/SP PRE/SP PRE/SP PRE/SP PRE/SP
TYPE PRESENCE TREBLE LEVEL MIDDLE GAIN
VR3 VR5 VR7
RD901-40-125F-B54-00D RD901-40-125F-B54-00D RD901-40-125F-B54-00D
R E F +3. 3 R E F +3. 3 R E F +3. 3 R E F +3. 3 R E F +3. 3 R E F +3. 3
2 2 2 2 2 2
D D D D D D
VR2 VR4 VR6
RD901-40-125F-B54-11D RD901-40-125F-B54-00D RD901-40-125F-B54-00D
[11detents]
OD/DS OD/DS OD/DS REVERB DELAY DELAY
TYPE LEVEL DRIVE LEVEL FEEDBACK LEVEL
VR11 VR13 VR15
RD901-40-125F-B54-00D RD901-40-125F-B54-00D RD901-40-125F-B54-00D
R E F +3. 3 R E F +3. 3 R E F +3. 3 R E F +3. 3 R E F +3. 3 R E F +3. 3
2 2 2 2 2 2
D D D D D D
VR10 VR12 VR14
RD901-40-125F-B54-11D RD901-40-125F-B54-00D RD901-40-125F-B54-00D
SW1 BOARD ASSY 75D913S000 (1/6)
"CTL"
+
D 3. 3
LED5
L-34HDSL
CN2 CN3
RIBON 7P (1/2) RIBON 7P (1/2)
R5
D 3. 3 + D 3. 3 +
390
1 1
1 1
2 2
2 2
3 3
3 3
4 4
4 4
5 5
5 5
SW_DATA5 6 6
6 6
SW_DATA6 7 7
7 7
SW_SCAN0
LED_DATA3
LED_CLOCK SW_DATA5
SW_DATA6
D7
1SS133
SW3 BOARD
2 1 2
SW_SCAN0
D 3. 3 +
SW_DATA4
SW_DATA3 C8
SW_DATA2 N.I.U.
SW_DATA1
SW_DATA0
D
CN5
WIRING 12P
+
C1 D 3. 3
TO CN2 ON 0.1
MAIN
IC2
BOARD
BU2090 (DIP)
D
15
Q11
14
Q10
13
Q9
LED_DATA0 12
Q8
2 11
DATA Q7
10
Q6
3 9
CLOCK Q5
8
Q4
7
Q3
6
Q2
5
Q1
4
Q0
D
[OD/DS] [OD/DS TYPE VARIATION]
D14 SW15 D15
2 1 2 1 2 1 2
1SS133 SKQKAB 1SS133
[WAH] [LOOP]
D22 SW23 D23
+
D 3. 3
2 1 2 1 2 1 2 C2
0.1
1SS133 SKQKAB 1SS133
[OUTPUT SELECT] [EXIT] IC3
D30 SW31 D31 BU2090 (DIP)
D
2 1 2 1 2 1 2
15
Q11
1SS133 SKQKAB 1SS133 14
Q10
13
Q9
[MANUAL] LED_DATA1 12
Q8
D38 SW39 D39
2 11
DATA Q7
2 1 2 1 2 1 2 10
Q6
3 9
CLOCK Q5
1SS133 SKQKAB 1SS133 8
Q4
7
Q3
6
Q2
5
Q1
4
Q0
D
PRE/SP PATCH
BASS LEVEL
VR9
RD901-40-125F-B54-00D
R E F +3. 3
R E F +3. 3
+
C3 D 3. 3
0.1
C11
2 2
N.I.U.
IC5
BU2090 (DIP)
D
D
15
D
Q11
14
Q10
13
Q9
LED_DATA2 12
Q8
VR8 2 11
DATA Q7
RD901-40-125F-B54-00D 10
Q6
3 9
CLOCK Q5
8
Q4
7
Q3
6
Q2
5
Q1
CHORUS 4
Q0
LEVEL
D
R E F +3. 3
2
D
VR16
RD901-40-125F-B54-00D
BANK BANK EXP PEDAL FX
DOWN UP ON/OFF
+ + +
D 3. 3 D 3. 3 D 3. 3
LED6 LED7 LED8
L-34HDSL L-34HDSL L-34HDSL
R6 R7 R8
390 390 390
BANK DOWN BANK UP
SW1 D1 SW2 D2
1SS133 1SS133
1 2 1 2 1 2 1 2
SKQKAKD010 SKQKAKD010
ASSY 75D913S000 (3/6)
PRE/SP PRE/SP PRE/SP DELAY CHORUS
CHANNEL A PRE/SP OD/DS CHANNEL B DELAY SOLO TAP COMP LEVEL
LED12 LED10 LED11 LED13 LED14 LED15 LED16 LED20 LED18
L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD
+ + + + + + + + +
D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3
R12 R10 R11 R13 R14 R15 R16 R20
390 390 390 390 390 390 390 390
ASSIGN
EQ WAH AMP CTL FX-1 LOOP FX-2 MASTER
CTL/EXP
LED21 LED22 LED25 LED24 LED23 LED26 LED27 LED28
L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD L-312LRD
+ + + + + + + +
D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3 D 3. 3
R21 R22 R25 R24 R23 R26 R27 R28
390 390 390 390 390 390 390 390
LED31 A-552SR BW
D 3. 3 +
14
DIG1
R38 470
R39 470
R44 470
R40 470
R41 470
R42 470
R33 470
R34 470
R35 470
R43 470
R37 470
R36 470
R31 470
R32 470
GT-8
REVERB
LEVEL
LED19
L-312LRD
+
D 3. 3
R18 R19
390 390
TUNER/
MANUAL
BYPASS
LED29 LED30
L-312LRD L-312LRD
+ +
D 3. 3 D 3. 3
R29 R30
390 390
D 3. 3 +
13
DIG2
A
F B
G
E C
D
DP
39