Service Manuals, User Guides, Schematic Diagrams or docs for : . Various SM scena DBX 290 (rev A1) Schematics
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REVISION DESCRIPTION ECN# DATE REVISION DESCRIPTION ECN# DATE
A0 RELEASE FOR PRODUCTION EMI VERSION OF THE dbx 290 6-28-96
100ns DRAMS ARE TO SLOW AND CAUSE EXCESS DISTORTION
A1 AND A ERROR IN 2.07 SOFTWARE WAS DISCOVERED. 1019 16 AUG 96
|LINK
|056038A1.001 dbx PROFESSIONAL PRODUCTS
|056038A1.002
|056038A1.003 8760 South Sandy Parkway
|056038A1.004 Sandy, Utah 84070
|056038A1.005
Title
dbx 290 (EMI) 80-6038
Size Document Number Rev
B 056038A1.000 A1
Date: Monday, October 18, 1999 Sheet 0 of 5
C23 25PJD1
R50 100K
P2A
100K402005
R38 R39 1 3 R100
Input Left/Mono 20.0K 1% 20.0K 1%
J1
2
+12V OMIT
J322110 C20 C35
R51 R52
C49 1NPME1
8
1 470PMD1
2K 18K
4 R19 2 10NPME1 4558 6
RET_L
5 10.0K 1% 1 2 7
2 3 U14A 1 5 U16B
6 R96 3 U32A R98
4558
C12 2.00K 1% 51.1K 1% C27 4558
3
4
470PMD1 .0033J
4
-12V C59
R18 -12V 1NPME1
10.0K 1% C57
3
1NPME1 Output Left
100K402011
2
P3A J3
3
P1A R11
100K402011 2 3 NE5532 J322110
470
1
1 1
2 U31A 4
1
C14 5
470PMD1 2
C61
4
6
1NPME1
R102 -12V
3
4.7K
R13
SEND_L C47 R92
R93 470
25PJD1
DETECTOR OMIT 10.0K 1%
C22
470PMD1
R47 100K
R76
4.7K
R101
OMIT
C42 R48 R49
1NPME1 4558
2K 18K 2
RET_R
1
3 U16A
R99
51.1K 1% C28
4
.0033J
P2B -12V
R41 R40 100K402005
20.0K 1% 20.0K 1% 4 6 C60
Input Right 1NPME1
J2
5
6
C13 +12V +12V Output Right
J322110 470PMD1 +12V 5
P3B
8
6
8
1 C50 R12 J4
100K402011 NE5532
8
4 R20 6 10NPME1 C56 5 5 470 J322110
4
5 10.0K 1% 7 6 7 1
U14B 1NPME1
2 5 7 6 U31B 4
R97 U32B P1B
4
6 4558 5 C1 5
C21 2.00K 1% 4558 100K402011 470PMD1 2
C58
3
470PMD1 6
R21 1NPME1
3
10.0K 1%
R95 R94
+5V STEREO_IN C43 SEND_R 10.0K 1%
OMIT
R6 200PMD1 +12V
4.7K R14 +5V
D11 470
1N4148 R58 C45
OMIT .022J R7
C29 4.7K
D12
1N4148 240PMD1
C4 STEREO_OUT
+12V 470PMD1
R60 R29 R44
8
10K R36
470K 220K 6 47K
7
D10 5 U15B GATE
C26 +12V
1N4148
R31 4558
.22LLME1 R59
8
2K +12V
6 C51 D9
DETECTOR 15K
7 2 1N4148
5 U18B 1
.22LLME1 3 U18A R43
4558 Q2
4558 2N4124 150K
R30 R27 VCC VDD +5V VSS
20K 3.3K
4
C31 R22
-12V 100K
1NPME1
4558
3 -12V
THRSH
C7 1
2 U15A
.047MA3
4
-12V
dbx PROFESSIONAL PRODUCTS
R63 R42 8760 South Sandy Parkway
10K 12K Sandy, Utah 84070
Title
dbx 290 (EMI) - INPUT,OUTPUT,MIX 80-6038
Size Document Number Rev
B 056038A1.001 A1
Date: Monday, October 18, 1999 Sheet 1 of 5
+12V DA[0..7] DA[0..7]
-12V_LED
+5V
R69 10K
10K D40 R75 D41 +12V
LEDR702113 +12V .047MA3
LEDR702113 R132
8
5
6
R133
L_0DB_LED 0dB R_0DB_LED 0dB 100 C63 3 1K
2
R104 R68 11 R110 R74 11 P4 7
R105 13 R111 13 1 3 2 U37
OMIT 1.2K L_0DB OMIT 1.2K R_0DB 5K402071
+5V
10K 10 U28D 10K 10 U29D
SEND_L SEND_R LM311
LM339 LM339 U30 DELAY
18K 18K
4
1
R108 R114 DA0 2 19
3 D0 Q0 18
2K 2K DA1 R135
D24 D25 4 D1 Q1 17
DA2 R125
+12V LEDG702114 +12V LEDG702114 5 D2 Q2 16 1M
DA3
-6dB -6dB 6 D3 Q3 15
R109 L_6DB_LED R115 R_6DB_LED DA4
9 9 7 D4 Q4 14 20.0K 1% R124
2K 2K DA5
14 14 8 D5 Q5 13 10.0K 1%
L_6DB R_6DB DA6 R123
8 U28C 8 U29C 9 D6 Q6 12
Q7 1LLM50E1 Q8 1LLM50E1 DA7
LM339 D7 Q7
2N4124 LM339 2N4124
11 20.0K 1% R121
C64 C62 *OUTEN2 CLK
12
12
R103 R70 1 R122 10.0K 1%
470K D20 470K D21 OE
-12V -12V
LEDG702114 LEDG702114
+12V +12V 74HC574
-12dB -12dB 20.0K 1% R120
3
3
-12V L_12DB_LED -12V R_12DB_LED 10.0K 1%
5 5 R119
R131 R118
-12V 2K 2 L_12DB 2K 2 R_12DB
H3 4 U28A 4 U29A 20.0K 1% R126
1 LM339 LM339 10.0K 1%
D16 D17 R127
2 L_18DB
LEDG702114 LEDG702114
3 L_12DB R107 R113 20.0K 1%
4 L_0DB 1K L_18DB_LED -18dB 1K R_18DB_LED -18dB R129
5 L_6DB 7 7 10.0K 1%
6 R_18DB 1 L_18DB 1 R_18DB R128
7 R_12DB 6 U28B 6 U29B
8 R_0DB +12V
9 LM339 LM339 20.0K 1% R130
R_6DB R106 +12V R112
10 330 330 +12V 20.0K 1%
+12V R71 *UART_RST
R65 2K *UART_RST
HDR321076
2K R73 200
R81
PA3 R67 20K LROW3
1 -12V_LED 20K H2
2N4125 R82 200
2 L_18DB_LED U20 LROW2 SWCOL0 1
3 L_12DB_LED R72 DA0 2 19 SWCOL1 2
Q3 D0 Q0 R83 200
4 L_0DB_LED R66 47K DA1 3 18 LROW1 SWCOL2 3
5 47K U21B 4 D1 Q1 17 4
L_6DB_LED 2N4125 DA2 R84 200 LCOL0
6 74HC244A 5 D2 Q2 16 5
R_18DB_LED DA3 ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo