PIN CONFIGURATION
SEE LAYOUT DIAGRAM
E
C
B
TO-92
MPSA63
MPSA43
MPSA13
2N5551
MPSA56
MPSA06
2N5401
D
G
S
TO-92
2N5638
J109
P
1
4
G2
8
5
NC
H
H
3
K
6
G1
2
NC
7
G3
5881WXT
NO1
NC1
NO2
NC2
COM1 COM2
3700_DRW
FUNCTION
KNOB
REF
MODEL(S):-
PART#
TREBLE
BASS
MID
CL GAIN
OD GAIN
TREBLE
BASS
MID
OD VOLUME
Resonance
MASTER VOLUME
Send Level
8431
8431
8431
8431
8431
8431
8431
8431
8431
8431
8431
8431
N
N
N
N
N
N
N
N
N
N
N
N
{NEW}
4424
4425
4423
4425
4425
4424
4425
4423
4425
4425
4423
4417
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
Potlist
YCS50/90
FX Ret 1
Presence
REVERB1
CL VOLUME
REVERB2
FX Ret 2
BOOST LEVEL
F
F
F
F
F
K
K
K
K
K
N
N
N
N
N
N
N
N
N
N
N
N
4423
4423
4423
4425
4423
4423
4425
P
P
P
P
P
P13
P14
P15
P16
P17
P18
P19
R
R
R
R
R
8431
8431
8431
8431
8431
8431
8431
2G
2K
1
9
1K
1G
4
H
6
2
3
H
8
7
2P
5
HT
1P
12AX7A
6882_PC
C
E
B
TO-92
BC560C
BC550C
"STYLE_P32"
5
2
#
6
3
4
1
DATE
MODEL(S):-
VER#
DESCRIPTION OF CHANGE
D
V
N
D
D
D
V
V
V
N
N
N
M1294 DRILL HISTORY
YCS50/90
1.00
2007/08/08
RELEASED FOR PRODUCTION
2007/12/10
2.00
REVISED BOARD PER PC#7333
12
9
6
3
#
13
11
10
5
4
8
7
2
1
DATE
MODEL(S):-
VER#
DESCRIPTION OF CHANGE
YCS50/90
M1294
.
.
.
.
.
.
.
.
1.00
PC#7287, replace input eyelets with RCA jacks #6541
2007/02/08
PC#7298, Change R94 from 180k to 82k, #4837 and
Change R91 from 47R to 33R, #4816
.
.
.
.
.
PC#7336, CHANGE R74 FROM 47K,#4834 TO 120K, #4851
CHANGE R98 FROM 2K2, #4847 TO 4K7,#4827
1.01
CHANGE R100 FROM 27K, #4833 TO 33K, #4840
CUT R91 CONNECTION AND RECONNECT IT TO W30 P4
REVISED BOARD PER PC#7333
N
N
N
2.00
2007/12/10
D
D
D
V
V
V
PC#7446, ONLY FOR YCS90, T&R WILL REMOVE TWO
24-MAY-2012 .
PC8405 - Changed resistor values. - ML
"STYLE_P28"
11
8
5
2
12
9
6
13
10
7
3
4
1
N
D
D
D
V
V
V
N
N
N
D
D
D
D
D
D
D
V
V
V
V
V
V
V
N
N
N
N
N
N
N
N
N
V
D
D
D
V
V
Summary of Contents for YCS50
Page 8: ......