Laney MXD120 H-Twin Schematic

Page 1
MXD120/H/Twin
Service InformationService Information
Laney
Classic British Amplification
Newlyn Road, Cradley Heath, West Midlands. B64 6B£
www.laney.co.uk
Page 2
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
0R0
C9
R21
LN1
150K
10N 1 00V
SK3 SJACK
G
AA
R19 100K
CD4069UBE
VDD
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
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
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
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
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
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
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
DSP Program Select
SW3 16PGRY
C
FXRETURN
FXSEND
+15V
G
LN16 0R0
NOTE:
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
+15V
+15V
R17 1K
G
D6 5V1 Z D0. 5W
VDD
G
C16 470U 16 V
-15V
R49 4K7
D13 LED3MMR
Power
G
Line Out
G
SK4 MJACK
C35
R47 100K
R42 1K
G
2U2 6 3V
G
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
119387_6.Sch
Rich Thompson
Page 3
A A
+40V-40V
HD1
123456
To Preamp PCB
HD6WL
B B
C C
G
HARDWIRED SOCKET
Wir e d D i rec t to O u tp ut PC B
FX Sen d
SK2 MJACKGSJ
FX Retur n
Gi
R3 1K
Q1 2N38 19
Gmu
C5 100U 25V
Gmu
Gmu
Gi
D4 1N41 48
TS8
MPSA42
C1
2U2 6 3V
D2 3V9 Z D0. 5W
D1 3V9 Z D0. 5W
R12 10K
Gmu
Gi
R13 33K
OFFSET ADJ
C2
R4 10K
1N 10 0V
Gi
C6 1U 63 V
Gmu
Gi
G
100R
LN10 0R0
+45V
R9 100R
R8
TS4 MPSA92
1K
TS2
MPSA92
R1
VR1
1KH
TS1 MPSA92
R7 220R
R2 100R
TS3 MPSA92
Gi
R6 100R
100P 100 V
C3 47U 5 0V
C4
-45V2
LN5 0R0
R5 100K
TS5 MPSA42
LN3 0R0
R10 2K2
R16 330R
R15 10K
-45V2
C7
47P 50V
LN4 0R0
LN8 0R0
R11 220R
TS6 MPSA92
D3 1N41 48
TS9
MPSA42
TS10
MPSA92 D7 1N41 48
2U2 6 3V
TS7 SAP16N
100N 63 VC10
R17 330R
1N41 48D6
R18
6K8
C11
6K8R19 330RR20
100N 63 VC13
G
G
1N41 48D8
TestPoint1
BIAS ADJ
TestPoint2
LN9 0R0
R22 220R
VR2 470RH
R14 0R22 5W
R21 0R22 5W
SAP16P TS11
-45V
D5 1N40 07
D9 1N40 07
C16 47N 1 00V
R23 10R 2W5
G
R24 10R 2W5
L1 COIL20T
Extension Loudspeak er
Internal Loudspeak er
SP4 SPADE 4.8
SP6 SPADE 4.8
R29
R28
0R22 5W
220R
G
SK4 MJACKSJ
Head Version Only!
Mai n s T ra nsf orm er 230V = 5600-2050B 120V = 5600-2052B
MAINS FUSE 230V =T2A L, 115V = T5A L
Mains In
IEC Inlet
Green/Yellow
D D
Flame proof resister
FP
Must only be replaced with same type and rating
Indicates safety critical component Must only be replaced with approved type
Black(Brown)
Fuse Integral to IEC
White (Blue)
Chassis Transformer Primary
Fuse
Mains Switch
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
G
1N40 07
C15
220N 250V
LN6 0R0
D11
D10
BR1
1N40 07
+V
AC AC
-V
6A 20 0V
+45V
C9
C14 100N 63V
4700 U 63V
G
-45V
C12
4700 U 63V
-45V2
C8 100N 63V
Gmu
LN7 0R0
R26
10R 2W5
R25 10R 2W5
BLT
Industries
+40V
G
-40V
Title
MXD120 OUTPUT
Number Revis ionSize
A3
Date: 23/1 0/2 003 Sheet of File: D:\93 91_3\93 91 _3. Sch Drawn By:
9391 3
119391_3.Sch
Rich Thompson
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