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REVISION HISTORY
REVISION DESCRIPTION ECN# DATE REVISION DESCRIPTION ECN# DATE
P2 VARIOUS SCHEMATIC CHANGES 10.24.94
A0 RELEASE TO PRODUCTION, BOARD IS REV A 11.22.94
A1 ADD R53 & R54. CHANGES C64 & C65 254 3.15.95
|LINK
|053238A1.001
|053238A1.002
|053238A1.003
|053238A1.004 dbx Professional Products
|053238A1.005
8760 South Sandy Parkway
Sandy, Utah 84070
Title
dbx 3231L CH1 MAIN BOARD 80-3238
Size Document Number Rev
B 053238A1.000 A1
Date: Monday, October 25, 1999 Sheet 0 of 5
INPUT
WA1
WA283449 J1 INPUT TRANSFORMER OPTION
J322110 1 (UNSOLDER PJ3 & PJ4 WHEN INPUT
4 TRANSFORMER IS INSTALLED)
5
1
2
2
6
3
H12A H12B H12C H12D H12E RANGE
HDR321063
INPUT GROUND
LIFT SWITCH SW1
H1
1
2
3
4
5
SW440131 1
V+ A
V+ 2
V- B
J2 L1
13
10
11
12
4
5
6
7
J322115 EMI1000PF 3
1 3 3 5 C
2 1 6 4
4 PJ3 2 U4 1 D
PJ BYPASS 5
E
2
3
4
L3 6
F
1
2
3
7
8
9
14
EMI1000PF V- SSM2141
1 3 7
G
PJ4 8
PJ H
C1
2
9
EQ OUT I
27PJC3
10
J
WT321164
R2
B1 TO/FROM
1 49.9K 1%
IN+ CONTROL BOARD
IN- 2 R1
C3
49.9K 1% EQ IN
GND 3 2 10NPSE1
1
4 3 U2A IN CLIP
OUT+
MC33078
OUT- 5
4
GND 6 V-
RELAY DEFEAT
BAR320301 (UNSOLDER PJ1 & PJ2 TO DEFEAT)
PJ1
PJ
OUTPUT
WA4 J4
WA283449 J322110 1
4 PJ2
5 PJ
2
1
2
6 H13A H13B H13C H13D H13E
HDR321063 V- V+
3
D8
1
2
3
4
5
1N4148 D7
J3 1N4148
J322114 C11
L9
EMI1000PF 47S63E
1 2 1 3 V+
4
PJ5 SSM2142
6
R36 2
PJ 10.0K 1% 1 4
3
2
K1 8 U5 3
L10
EMI1000PF 6 IN+ C21 7
1 3 4 47S63E
5
8 OUT+
11 IN- V-
R10 13 PJ6 R37
2
330 9 OUT- PJ 10.0K 1% D9
16 1N4148
V+ D10
V+
D3 1N4148
1N4001 V+ V-
1 OUTPUT TRANSFORMER OPTION
R11 D1 RLY725143 (UNSOLDER PJ5 & PJ6 WHEN OUTPUT
220K 1N4148 TRANSFORMER IS INSTALLED)
Q4
2N5088
C25 R18
47SE1 75K
V-
V-
dbx Professional Products
8760 South Sandy Parkway
Sandy, Utah 84070
Title
dbx 3231L CH1 MAIN BOARD 80-3238
Size Document Number Rev
B 053238A1.001 A1
Date: Monday, October 25, 1999 Sheet 1 of 5
R17 D2
200K 1% 1N4148
RANGE
R6 H3
C24 1
.047MM3 1.00K 1% R13 A
1.00K 1%
C1 2
B
1
R7
1
Q2 R12 C2 3
4.42K 1% C
Q1 J112 3 2
Q3 3 4.42K 1%
2 C3 4
R8 Q5 J112 D
13.3K 1% C20
C4 5
J112 27PJC3 E
1
C10 J112
1
R15 R9 C5 6
2 3 27PJC3 F
EQ IN 4.42K 1% 13.3K 1%
2 3 C6 7
R4 R5 G
4.42K 1% 1.00K 1% R16 C7 8
1.00K 1% H
R3 V+ C8 9
MC33078 I
13.3K 1% R14 C47
8
2 10
1 13.3K 1% 6 10NPSE1 J
3 U3A 7 WT321164
5 U3B EQ OUT
L4
EMI1000PF
3
4
1 3
MC33078
V-
2
2
H2
1 L2
A
EMI1000PF
1
2
B RC6
3 4.02K 1%
80 Hz
C
4 RC3 RC5
D
16.2K 1% 8.06K 1%
5 20 Hz 40 Hz V+
E +15 CA8
MC33078 RA6
CC7
8
6 V+ 30.1K 1% .39H63P
F CA3 CA6 5 10NPSE1
RA3 RA5
CC1 CC4
8
7 121K 1% .39H63P .39H63P 7 C7
G -15 61.9K 1% U6B
5 10NPSE1 3 10NPSE1 CB7 6
8 7 C1 1 C4 .39H63P
H U2B U7A MC33078
6 2
9 SLIDER BOOST CB3 CB6 RB6
I .39H63P .39H63P
MC33078 7.15K 1% RE6
4
10 SLIDER CUT RB3
J RB5 V-RE5 10.0K 1%
28.7K 1% RE3 14.3K 1%
WT321164 10.0K 1% 10.0K 1%
CD6
TO/FROM 27PJC3
SLIDER BOARD CD3 CD5
27PJC3 27PJC3
RD6
10.0K 1%
RD3
R41 10.0K 1% RD5 RC9
2.00K 1% 10.0K 1%
RC1 RC7 3.24K 1%
D11 6.49K 1% 100 Hz
R38 13.0K 1%
1
1N4148 25 Hz 50 Hz
2.00K 1% 2
IN CLIP Q11
2N6427 V+
R39 CA1 MC33078 RA7 CA9
C68 2M RA1
CC2 CC5 CA11
8
100K 1% .39H63P 48.7K 1% .39H63P RA9
.047MM3 CC8
3 10NPSE1 5 10NPSE1 24.3K 1% .39H63P
3
1 C2 7 C5 3 10NPSE1
2 U1A 6 U7B 1 C8
R40
340K 1% CB1 CB8 CB12 2 U9A
.39H63P .39H63P MC33078 .39H63P MC33078
4
RB1 RE7 RB9
RB7
4
23.2K 1% V- 10.0K 1% 5.76K 1%
11.5K 1% V- RE9
RE1
10.0K 1% 10.0K 1%
CD7
CD1 27PJC3
27PJC3 CD9
27PJC3
RD1 RD7
10.0K 1% 10.0K 1% RD9
RC4 10.0K 1%
63 Hz
RC2 5.11K 1%
10.2K 1%