LX20/LX20R
Service InformationService Information
www.laney.co.uk
1
SK1
MJACK
G
A A
B B
C C
D D
GG
Input
Flame proof resister
FP
Must only be replaced with same type and rating
Indicates safety critical component
Must only be replaced with approved type
+15V2
D1
1N4148
R1
10K
47pF
G
1
+15V2
D2
C1
-15V
1N4148
G
R2 22K
C3
220nF
R3
4K7
-15V
C2
270pF
U1A
TL072
C4
22nF
Clean Channel
C7
100nF
2
R4
150K
2
CD4069UBE
1 2
VR1
100KA
G
R7
100K
+5V
U4A
G
C10
1nF
CD IN
SK2
SJACK
G
100nF
C7
R6
33K
-15V
G
R30 22K
R31 22K
D3
LEDGr
VR2B
100KA D
+5V
G G
R6
2K2
G
+21V
-21V
C38
470uF
R8
100K
C8
100nF
D4
1N4148
D5
1N4148
3
SW1B
2P2WPSA
R10
47K
C26
1uF
C27
1nF
D13
5V1 0.5W
3
G
Drive Channel
C9
R11
1M
4.7nF
U4B
R9
3 4
47K
CD4069UBE
R50
100K
G
C30
10uF
R33
100R
G
R43
1K
C10
100nF
VR2A
100KA D
G
+21V
C28
220nF
G
U4
TDA2050
-21V
C29
220nF
-21
G
R28
10K
R341KR35
C31
22nF
G
G
Power Led
-21V
47R
+15V2
G
4
Channel Switch
R13
1M
U4C
C12
R39
47R
Loudspeaker
100R 2W5
100R 2W5
47nF
HD3
HD2WL
R41
R42
12
R14
100K
C13
2.2nF
SK3
SJACK
+
+21V
-21V
5 6
R12
22K
CD4069UBE
C11
220nF
C33
R38
47nF
470R
G
G
R37
4R7 2W5
C32
220nF
G
R36
0R47 2W5
G
+15V
C37
D11
47uF
15V 1.3W
15V 1.3W
D12
C39
47uF
-15V
D10
LEDR
R40
4K7
4
R15
100K
C35
2200uF
C36
2200uF
5
C14
47pF
R16
1M
U4D
9 8
CD4069UBE
D6 1N4007
D9 1N4007
G
D8 1N4007
D7 1N4007
Title:
Size: Number:
Date:
Original File:
5
C15
R17
100K
22nF
Drive Volume
C34
10nF
VR3
C16
100KA
47pF
R18
G
100K
G
R24
1K
R25
39K
G
G
15W GUITAR AMPLIFIER
A3
16/05/2006 14:46:10
9343 4
9343_3.SCHDOC
SW1A
2P2WPSA
G
HD4
123
HD3WL
6
C17
47pF
R19
100K
TL072
G5
+15V
U2A
TL072
R22
100R
-15V
R23
22K
C21
270pF
C22
22nF
HCM15R MODEL ONLY.
These items not on pcb
Revision:
Sheet ofTime:
6
U1B
R20
3K3
C20
220nF
C200
100nF
TO REVERB
HD1
HD2
12
12
HD2WL
HD2WL
AC Line(Live)
Transformer Primary
AC Input (Neutral)
MAINS TRANSFORMER
Steelpark Road
Coombs Wood
Industrial Estate West
Halesowen
1
1
UK
www.laney.co.uk
7
C18
3.3nF
C19
220nF
G
GG
C23
4.7nF
G
115V = T500mA L
230V = T250mA L
Mains Switch
7
VR4
Treble
22KB
R21
33K
VR5
100KA
Bass
VR6
2K2B
Mid
U2B
TL072
R26
C24
22K
2.2nF
G
R27
10K
R28
1K
C25
1uF
G
SP2
SPADE4.8
(Fuse and Spades on PCB)
F1
R44
1K
Black(Brown)
SPADE4.8
SP1
White (Blue)
VR7
4K7B
G
Mains In
IEC Inlet
8
-15V
TL072
+15V2
R29
100K
Green/Yellow
Chassis
8
U5A
1
C40
4.7nF
G
SK1
MJACK
A A
B B
GG
Input
R5
10K
R4
1M
G G
47pF
+15V2
C8
-15V
D1
1N4148
D2
1N4148
G
+15V2
TL072
R2 22K
C6
220nF
R1
4K7
-15V
C5
270pF
U1A
2
R9
100K
CD4069UBE
R10
150K
1 2
C11
22nF
Clean Channel
C7
100nF
U3A
G
VR1
100KA
G
+5V
1nF
C10
100nF
VR2B
100KA D
C17
R6
33K
-15V
3
R7
LED1
2K2
LEDGr
R8
G
100K
G
C15
100nF
2P2WPSA
SW1B
G
Drive Channel
C14
4.7nF
R11
47K
R12
47K
R13
1M
U3B
3 4
CD4069UBE
G
C16
100nF
VR2A
100KA D
R15
22K
4
U3C
5 6
CD4069UBE
C20
220nF
Channel Switch
R18
1M
C19
47nF
R19
100K
C21
2.2nF
100K
R16
5
C18
47pF
1M
R14
U3D
9 8
CD4069UBE
22nF
100K
R20
C22
C23
47pF
G
Drive Volume
G
VR3
100KA
220K
R17
2P2WPSA
SW1A
6
C9
47pF
R3
100K
0R0
LN3
G5
U1B
LN1
0R0
R121
100K
TL072
0R0
LN2
G
G5
R25
100K
7
47pF
R38
100K
TL072
8
-15V
U5A
TL072
+15V2
C39
U5B
LN10
0R0
LN5
0R0
R23
3K3
C24
220nF
C25
100nF
C30
220nF
C29
3.3nF
Treble
VR6
R27
22KB
33K
VR4
Bass
100KA
VR5
2K2B
Mid
G
C34
47nF
G
R34
0R47 2W5
G
C36
10nF
G
G
R30
4R7 2W5
C35
220nF
9385_4.Sch
R31
47R
Loudspeaker
To DSP Board
HD3
123456
PTA0
PTA1
PTA2/IRQ
PTA3
PTA4
PTA5/OSC
123456
+5V
+15V2
-15V
FX Return
C C
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
1
FX Send
G
HD1
2
16PGRY
SW2
4
3
DSP Program Select
1
2
C
G
+5V
G G
C13
100nF
C12
10uF
3
CD/Line In
SK2
G
PHONOSTV
LM7805
U2
GND
G
+15V2
+21V +15V
INOUT
G
Power Led
C2
100nF
C1
100nF
G
-21V
G
R37
4K7
LED2
LEDGr
Top
Bot
C4
47uF
C3
47uF
R24
100K
+21V
-21V
G
C38
2200uF
C37
2200uF
LN7
0R0
R26
100R
G
+21V
TDA2050
R291KR36
+21V
1N4148
R33
D6
D5
1N4148
-21V
D4
15V 1.3W
15V 1.3W
D3
100R 2W5FP
C27
1uF
C26
1nF
R21
FP
100R 2W5FP
R22
FP
LN6
0R0
G
C28
10uF
LN8
0R0
-21
22K
R35
22K
0R0
LN4
-15V
4
R32
470R
C31
220nF
G
U4
-21V
C32
220nF
-21
G
R28
10K
47R
C33
22nF
G
D7 1N4007
D10 1N4007
D9 1N4007
D8 1N4007
15W GUITAR AMPLIFIER (WITH FX)
Title:
Size: Number:
A3
16/05/2006 15:27:24
Date:
Original File:
5
SK3
SJACK
HD2
-
12
+
HD2WL
These items not on pcb
HD4
123
HD3WL
G
9385 4
6
MAINS TRANSFORMER
Revision:
1
Sheet ofTime:
115V = T500mA L
230V = T250mA L
AC Line(Live)
Transformer Primary
AC Input (Neutral)
Mains Switch
Steelpark Road
Coombs Wood
Industrial Estate West
Halesowen
1
UK
www.laney.co.uk
7
Black(Brown)
SPADE4.8
SPADE4.8
F1
SP1
SP2
(Fuse and Spades on PCB)
White (Blue)
Mains In
IEC Inlet
Green/Yellow
Chassis
8
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