Page 1
MXD120
Service InformationService Information
Laney
Classic British Amplification
Newlyn Road, Cradley Heath, West Midlands. B64 6B£
www.laney.co.uk
Page 2
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
Page 3
7654321
8
D
To Preamp PCB
C
B
HD1
123456
HD6WL
+40V-40V
D
HARDWIRED SOCKET
Wired Direct to Output PCB
FX Send
G
SK2
MJACKGSJ
FX Return
OFFSET ADJ
Gmu
Gi
D4
1N4148
TS8
MPSA42
C1
2U2 63V
D2
3V9 ZD0.5W
D1
3V9 ZD0.5W
R12
10K
Gmu
C2
R4
10K
Gi
1N 100V
Gi
R13
33K
C6
1U 63V
Gmu
Gi
R3
1K
Q1
2N3819
Gmu
C5
100U 25V
Gmu
Gi
G
100R
LN10
0R0
R9
100R
R8
TS4
MPSA92
1K
TS2
MPSA92
R1
VR1
1KH
TS1
MPSA92
R7
220R
R2
100R
TS3
MPSA92
Gi
C3
47U 50V
R6
100R
C4
100P 100V
-45V2
LN5
R5
100K
TS5
MPSA42
LN3
R10
2K2
R16
330R
R15
10K
-45V2
C7
47P 50V
LN4
0R0
LN8
0R0
R11
220R
TS6
MPSA92
D3
1N4148
TS9
MPSA42
TS10
MPSA92
D7
1N4148
2U2 63V
C10100N 63V
C11
C13 100N 63V
R17
330R
R18
6K8
R19 6K8
R20 330R
D6 1N4148
D8 1N4148
TestPoint1
G
R22
220R
LN9
0R0
VR2
470RH
BIAS ADJ
G
TestPoint2
TS7
SAP16N
R14
0R22 5W
R21
0R22 5W
SAP16P
TS11
+45V
-45V
D5
1N4007
D9
1N4007
C16
47N 100V
R23
10R 2W5
G
R24
10R 2W5
L1
COIL20T
Extension Loudspeaker
Internal Loudspeaker
SP4
SPADE4.8
SP6
SPADE4.8
R29
R28
0R22 5W
220R
G
SK4
MJACKSJ
Head Version Only!
C
B
LN6
Mains In
IEC Inlet
Green/Yellow
A
FP
Indicates safety critical component
Must only be replaced with approved type
Black(Brown)
White (Blue)
Chassis Transformer Primary
Flame proof resister
Must only be replaced with same type and rating
1 2 3 4 5 6 78
MAINS FUSE 230V =T2A, 115V = T5A
Mains Switch
Fuse
Fuse Integral to IEC
AC Line(Live)
AC Input (Neutral)
NOTE:
Set VR5 to give 20mV across TP1 and TP2
Refer to service manual before adjusting bias preset
MAINS TRANSFORMER
These items not on pcb
SP3
SPADE4.8
SP1
SPADE4.8
SP2
SPADE4.8
D11
D10
1N4007
BR1
+V
AC
AC
-V
6A 200V
1N4007
C15
G
220N 250V
+45V
C9
C14
100N 63V
4700U 63V
G
-45V
C12
4700U 63V
-45V2
C8
100N 63V
Gmu
LN7
0R0
R26
10R 2W5
R25
10R 2W5
BLT
Industries
+40V
G
-40V
Title
MXD120 OUTPUT
Number RevisionSize
A3
Date: 11-Jun-2003 Sheet of
File: D:\9391_3\9391_3.Ddb Drawn By:
9391 3
119391_3.Sch
A
Rich Thompson
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