PCB#:
YORKVILLE
NAME:
MODELS:
SCH ISSUE:
TITLE:
DATE:
M1018
BM400E
BM400
M1018V33.SCH
JUN/28/2000
BASS_AMP_400W
3.40
#7417
LE_SON
8R/30W
10R
5W
TR1
#7333
15"
8R/200W
MR752
D27
MR752
D29
10
9
8
7
6
5
4
3
2
1
#
DESCRIPTION OF CHANGE
VER#
DATE
MODEL(S):-
D
D
JUN/28/00
FEB/02/99
DEC/04/97
APR/10/97
OCT/15/96
JUN/28/96
APR/02/96
SEP/13/94
V
V
3.40
3.30
3.20
3.10
3.00
2.90
2.80
2.70
N
N
C11->C14_2u2->1u
XFMR_WIRE_COLOURS_UPDATED
PC#5545_ADDED_TWEETER
PC#5355_ADD_R92_C36
PC#5221_R83_470R-->270R
PC#5155_R38__3K9-->2K2
PC#5050_A4N7_AT_Q6_R83,C34
PC#4665_XFMR_FOR_SEMKO_TO_#1202S
BM400-BM400E
M1018.SCH_DATABASE_HISTORY
4700u
50V
C1
270R
R83
S2
4n7
C34
220R
R35
1K8
1W
R13
1K8
1W
R15
MT1
NC
MT2
MBS4992
D S G
J108
BC550C
C B E
BC560C
G D S
MTA2955
MTA3055E
REF
IN
OUT
7915
G
MT2
MT1
MAC224
B C E
MJF15031
MJF15030
VIEW
BOTTOM
B
E
MJ15022
MJ15023
IN
OUT
REF
7815
S2
TAB8
TAB5
TAB6
TAB1
TAB2
TAB4
TAB3
WC5
WC3
WC4
WC2
250V
100n
250V
4n7
TAB9
13A/85C
TBKR1
T2.5A
F1
WC11
#1207E
230VAC
370VA
T1
TAB7
6V
10u
C10
6V
10u
C33
MBR160
D12
2
1N5251B
22V/.5W
ZD8
WC15
WC13
WC14
CONN2
1
2
3
4
5
6
7
8
1K5
R17
RED
LED1
1M
R89
J108
Q22
1
WC9
TAB8
TAB5
MR752
D30
BAT85
D34
MR752
D32
TAB6
100n
C8
TAB1
TAB2
TAB4
TAB3
WC5
WC3
BAT85
D20
33K
R51
WC4
WC2
WC8
1N4004
D23
VTL5C8
U3
1N4004
D24
100n
C7
BAT85
D7
330p
C16
D9
100n
C6
MR752
D28
1u
25V
C30
2u2
25V
C31
D25
22V/.5W
1N5251B
ZD7
1M
R82
10K
R81
WC7
BAT85
D5
WC6
2K2
R80
10R
R79
39K
R78
MT1
G
MT2
Q18
MT1
MT2
G
MAC224
Q17
MR854
D22
MR752
D26
6V
10u
C32
180R
R91
D10
33K
R48
S
R
T
OUTPUT
NO-GOLD
JB2
1
2
3
4
5
6
1K
0.5W
R18
100n
C5
250V
100n
C25
400V
4n7
17K8
R26
17K8
R27
2K49
R28
2K740
R30
68R
R29
S
R
T
OUTPUT
NO-GOLD
JB1
1
2
3
4
5
6
MR854
D21
15n
C38
TAB9
15n
C35
560K
R8
560K
R3
56K
R6
56K
R7
1K
R1
1K
R2
1K5
R9
1K5
R5
1K
R33
16V/1W
1N4745
ZD5
D19
BAT85
D6
4700u
50V
C2
100p
C15
1K
R45
270R
0.5W
R73
16V/1W
1N4745
ZD1
1/2
TLO72
U2
6
5
7
6K8
0.5W
R55
1K8
R31
MR752
D33
2K87
R34
2K2
R38
10R
R37
10R
R39
1K8
R43
470n
C9
2K87
R44
220R
R46
680R
R40
27R
R57
IN
REF
OUT
7915 Q21
2
1
3
33R2
R36
180R
R90
BC560
Q5
BC560
Q6
BC560
Q4
3n3
C17
MJE15030
Q13
MJ15031
Q8
MJ15023
Q9
MJ15022
Q12
0R18
5W
R58
0R18
5W
R60
4n7
C18
560R
R4
100n
C23
33R2
R41
1u
35V
C14
MBR160
D11
13A/85C
TBKR1
6K8
0.5W
R54
MJ15022
Q15
CW
4K7
A
PT1
S
G
D
N
MTA3055E
Q14
390R
5W
R63
390R
5W
R64
16V/1W
1N4745
ZD3
16V/1W
1N4745
ZD4
270R
0.5W
R70
270R
0.5W
R69
100n
C22
MR752
D31
470R
1W
R11
470u
25V
C21
5uH
L1
270R
0.5W
R67
16V/1W
1N4745
ZD6
MJ15023
Q10
D17
D15
D18
25V
10u
C29
D16
BAT85
D8
BC550
Q1
270R
R56
18R
0.5W
R74
220n
C19
BC560
Q7
1u
35V
C12
1R
0.5W
R49
1R
0.5W
R52
MR854
D1
MR854
D2
270R
0.5W
R77
470u
25V
C24
5A-SB
F1
0R18
5W
R59
0R18
5W
R61
WC12
BC550
Q3
27K
0.5W
R87
1u
35V
C13
16V/1W
1N1745
ZD2
1K
0.5W
R19
470R
1W
R14
470R
1W
R16
220n
C36
470R
1W
R12
4K7
0.5W
R20
470R
1W
R10
D14
IN
REF
OUT
7815
Q20
1
2
3
3R9
2W
R92
270R
0.5W
R68
270R
0.5W
R72
270R
0.5W
R71
220n
C26
22R
0.5W
R47
18R
0.5W
R75
22R
0.5W
R50
270R
0.5W
R66
WC11
BC550
Q11
20K0
R32
20K0
R42
270R
0.5W
R76
BC550
Q2
27K
0.5W
R86
D13
5600u
100V
C4
270R
R53
P
S
G
D
MTA2955
Q16
1u
35V
C11
1/2
TLO72
U2
2
3
1
5600u
100V
C3
27K
0.5W
R88
390R
5W
R65
390R
5W
R62
27K
0.5W
R85
#1202
120VAC
370VA
T1
TAB7
3u3
100V
TC1
YEL
YEL
-40V
-40V
-40V
FOP_DRV
FOP_DRV
+15V
+15V
-15V
-15V
AGND
AGND
AGND
AGND
AGND
AGND
AGND
-FLOATV
-FLOATV
-FLOATV
FOP_OUT
FOP_OUT
+90V
+90V
-90V
-90V
AMPIN
LG
LIMSIG
+40V
+40V
+40V
RED
RED
RED
RED
+FOPV
-FOPV
AMP_OUT
AMP_OUT
AMP_OUT
LIMIT
LIMIT
FETCTL
FETCTL
SG
SG
SG
+FLOATV
+FLOATV
PHONE JACK -
PHONE JACK +
IS #1202S WHICH HAS A RESETTABLE
BREAKER IN THE PRIMARY WINDINGS
NOTE: XFMR FOR SEMKO UNITS
EUROPEAN EXPORT POWER SUPPLY
NORTH AMERICAN POWER SUPPLY
BLUE
GRN/YELL
BROWN
PLEASE, USE EXTREME CAUTION WHEN SERVICING!
THIS PRESENTS A SIGNIFICANT SHOCK HAZARD.
WARNING: 180VDC IS BETWEEN POWER SUPPLIES.
SG AND LG CONNECTED TO AGND AT POWER SUPPLY
TANT
TANT
TANT
TANT
ADJUST PT1 FOR 1.5 TO 2.5mV BETWEEN TP1 AND TP2 WITH AMP COLD
LIMITER DRIVE
100V
BAV21
BAV21
PREAMP BOARD
TO M1019
QUIET TURN ON/OFF
DC PROTECTION
POWER AMP
FLOATING OP AMP
MBS4992
100V
(U2)
(U2)
BAV21
BAV21
BAV21
BAV21
100V
100V
NOTES:
BIAS
LOW VOLTAGE POWER SUPPLY
ALL UNMARKED DIODES 1N4148
WHITE
GREEN
BLACK
