Laney MXD120 Schematic
MXD120
Service InformationService Information
Laney
Classic British Amplification
Newlyn Road, Cradley Heath, West Midlands. B64 6B£
www.laney.co.uk
1
MJACK
G
SK1
GG
A A
B B
Input
C4
4N7 1 00V
R1
10K
R2
1M
G G
+15V
C2
-15V
47P 50V
D1
1N41 48
D2
1N4148
C7
G
+15v
TL072
-15V
R4
C6
270P 250 V
2U2 6 3V
R6
4K7
U1A
22K
FootSwitch
2
0R0
C9
R21
LN1
150K
10N 1 00V
SK3
SJACK
G
AA
R19
100K
CD4069UBE
VDD
147
1 2
U2A
G
Clean Channel
C12
3N3 5 0V
Treble
VR4
R9
10K
22KB6S
C14
220N 63 V
Bass
VR2
100K A6S
220N 63 V
Mid
C13
VR3
C10
100N 63 V
2K2B6S
G
100N 63V
C19
100K A6SD
LN2
0R0
G
VR5A
1N41 48
G
Drive Channel
R8
100K
Hard wire on top side of pcb
-15V
R16
10K
SW1A
2P2WPS
G
SW1B
2P2WPS
G
Channel Select
3
Q2
2N38 19
D7
TL072
R3
10K
G
Drive On
R13
1K
D4
3V9 Z D0. 5W
R18
100K
G
R5
33K
C17
10N 100V
U1B
-15V
G
R20
47K
C8
100N 63 V
D5
LED3MMG
R15
2K2
TS2
BC307
R24
1M
U2B
3 4
CD4069UBE
VR1
100K A6S
G
R14
G
100K
R12
470K
G
C5
1N 10 0V
C15
100N 63V
C20
100N 63 V
VR5 B
100K A6SD
-15V
G
4
R11
10K
TS1
BC307
U2C
5 6
R22
47K
CD4069UBE
C18
100N 63V
R10
100K
R25
1M
22N 100V
R7
220K
C11
100N 63 V
G
5
C21
47P 50V
R23
1M
U2D
C22
R26
220K
Q1
2N38 19
9 8
CD4069UBE
D3
1N41 48
LN7
0R0
R36
3K3
220N 63V
220N 63V
C28
C31
100N 63V
LN3
0R0
C32
3N3 5 0V
C23
Treble
G
VR9
22KB6S
Bass
VR7
100K A6S
VR8
2K2B6S
Mid
+15V
TL072
-15V
R33
10K
SW2B
R35
10K
G
6
R29
10K
U3A
2P2WPS
Max On/Off
R28
6K8
2P2WPS
SW2A
100N 63V C25
R34
10K
G G
R37
15K
C27
4N7 1 00 V
R30
15K
TL072
R32
10K
1N 10 0V
U3B
C26
100K A6S
VR6
Master Volume
R31
22K
C24
47N 100V
LN6
0R0
G
R27
220K
7
Tape/CD In
SK2
G
G
PHONOSTV
Q3
2N38 19
D8
1N41 48
LN5
Top
Bot
0R0
R43
22K
R46
22K
R48
10K
G
R38
220K
LN8
0R0
TL072
G
FXSEND
FXRETURN
DSP Level
8
R52
100K
D10
1N41 48
R40
100K
100K
LN12
0R0
D9
1N41 48
LN15
0R0
C30
47P 50V
R39
100K
U4B
TL072
LN9
0R0
G
R41
+15V -15V
C29
47P 50V
-15V
U4A
+15V
R50
1K
VR1 0
22KB6S
G
LN14
C C
TO OUTPUT PCB
9353/9391
Programming He ader
HD2
123456
PTA0
PTA1
PTA2/IRQ
PTA3
PTA4
D D
PTA5/OSC
FX Return
FX Send
123456
+5VDSP
-15V
G
HD1
1
DSP Program Select
SW3
16PGRY
1
2
3
4
C
FXRETURN
FXSEND
+15V
G
LN16
0R0
NOTE:
2
HD6WL
HD3
123456
R44
R45
R51
330R 5W
LN10
0R0
C38
10U 5 0V
G
15V Z D1. 3W
560R 5W
560R 5W
15V Z D1. 3W
+15VDSP
15V Z D1. 3W
G
D11
D14
G G
D12
G G
IN OUT
GND
G
U5
7805
LN11
0R0
C36
47U 5 0V
C37
47U 5 0V
G
C3
-15V
100N 63V
C1
100N 63 V
G
+5VDSP
C33
C34
100N 63 V
10U 5 0V
3
+15V
+15V
R17
1K
G
D6
5V1 Z D0. 5W
4
VDD
G
C16
470U 16 V
-15V
R49
4K7
D13
LED3MMR
Power
G
Line Out
G
SK4
MJACK
C35
R47
100K
R42
1K
6
G
2U2 6 3V
G
5
0R0
NOTE: MXD65 / R51 = 270R
NOTE: MXD120 / R51 = 330R
NOTE: All resistors to be 1/4W unless otherwise stated
NOTE: All capacitors to be rated at 16V or higher
Title
MXD65 / MXD120 PREAMP
Number Revis ionSize
A3
Date: 10/1 0/2 003 Sheet of
File: C:\D ocu ments and Sett in gs\..\9387_6 .Sch Drawn By:
9387 6
7
119387_6.Sch
Rich Thompson
8
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