dbx 166A Service Manual

	REV		DESCRIPTION			ECN#			DATE
	P1		VARIOUS CHANGES			----			12.22.94
	A0		CHANGES R173 & R202 1M TO 39.2K 1%			----			1.17.95
	B0		VARIOUS HOLES SIZES CHANGES IN PCB.			----			3.1.95
	B1		REPLACE WIRE 36-0052 W/ 36-1140			330			4.11.95
	B2		ADD 2 16 PIN DIP SOCKETS			516			8/28/95
	B3		REMOVE 4 14-PIN IC SOCKETS			647			12.13.95
	B4		STANDARDIZE FILM CAPS			714			1.17.96
	B5		REMOVE C59 & C60			842			4.3.96
	B6		CHANGE QT283332 TO QT322102			905			4.29.96

	REVISION		DESCRIPTION			ECN#			DATE

|LINK

|056207B6.001

|056207B6.002

|056207B6.003

|056207B6.004

|056207B6.005 dbx Professional Products

|056207B6.006

8760 South Sandy Parkway
Sandy, Utah 84070
Title	dbx 166A DUAL COMPRESSOR/EXPANDER 80-6207
Size	Document Number				Rev
B	056207B6.000				B6
Date:	Thursday, October 21, 1999	Sheet	0 of	6

BALANCED INPUT		CHANNEL 1	C45
J11			27PJC3
J322115						+15V
1	2						R163
		IN1+	R161
						TP500317	20.0K 1%
4								J105-2
			33.2K 1%
						TP8
					R165
3							C46
		IN1-			5.1K		47PJ100M3
			+15V			1 2
					-15V
J12		R160
			8		R172	3 7 5
J322110		49.9K 1%
			6					R164
2					20.0K 1%
5			7		1	8	2	2.00K 1%
4		C63	5				1
					U25
1		1000PJ100M3	U20B	C49			3
					UPC1252
6							U20A
		R159	NE5532	22NPM25E1		6 4 2
		49.9K 1%					NE5532
3							4
							-15V
		R139	C35				+15V
		33.2K 1%						VCA SYM
			27PJC3				1
		C64

SIDE CHAIN	1000PJ100M3		VCA CV LINK			2	P17
							50K420222
J8				R168
		R162				R169	3
J322110				47		150K
		2.00K 1%
2							-15V
5
4	C57					+15V	OUTPUT
1	1000PJ100M3	R203	R167	R171		3	GAIN
6		200 1%	2.00K 1%
				5.76K 1%		2
							P5
3			COMP 1 CV
							10K402122
	C4
						1
	.39J
						-15V
	C58						OPTIONAL
	1000PJ100M3
						+15V
WA8	WA12		R166				GAIN TRIM
WA283449	WA283449		1.62K 1%		R173		1
						2	P19
			GATE 1 CV
							OMIT

2 1	2 1		OMIT	50K420222
		D54	39.2K 1%	3
		1N4148		-15V
			R170
			100 1%
		RMS TRIM

P15

+15V

50K420222

1

-15V

3

2

R40

R38

24.9K 1%

49.9K 1%

J105-10

R39

SW5B

SW5D

R43

20

24.9K 1%

4

10

5

11

6

12

R42

4

U9

3

16.9K 1%

SYM

GND

1

7

RMS 1 OUT

SW440026

2

IN

OUT

6

CONTOUR

C5

8

BIAS

CAP

5

-15V

.047J

V+

V-

R97

UPC1253

22M

RMS LINK

+15V

C19

R120

R41

C3

.15J

499 1%

.1MD3

560K

R37

R121

-15V

C15

1.5M

10M

1M50E1

-15V

D34

LEDG702062

D35

LEDG702062

C17

.0047J

C20

.39J

9

8

10

U10C

TL074

			U18A
			4
			TL074
			3	1
			2
						U18D
			+15V	R145	13	TL074
						14
			49.9K 1%		12
			R148
			49.9K 1%
			R147			PEAKSTOP THRESHOLD LINK
			4.32K 1%				J1
						J105-1	1
	+15V		-15V				2
						J105-2
PEAKSTOP	3	R146					3
LEVEL		7.50K 1%					4
	2		6			J105-5	5
P6				7			6
			5				7
20K402121	1
							8
			U18B
	R87					J105-9	9
	3K		TL074				10
			11			J105-10
						J105-11	11
					D52		12
			D53			+15V
					1N4148		13
						J105-13
			1N4148				14
						-15V
							15
							16
			R157				RC321155

		6.04K 1%	J1A
U18C	R156		DIP16S
TL074		U19A
10			R158
	10.0K 1%	NE5532
8		2	60.4 1%
9		1
		3

R136	R138	4
	2.67K 1%
10.0K 1%				R155
		-15V
				4.53K 1%		IN1-
R135						IN1+
20.0K 1%				R153
				3.16K 1%			BALANCED OUTPUT
	R149			R151	SW4B		J9
					SW440026
	3.16K 1%			3.24K 1%			J322114
					4	10
					5	11	2	1
					6	12		4
				R152		SW4D
				4.53K 1%
							3
		+15V			BYPASS
		8	U19B		7	1
			NE5532					J10
		5	7		8	2	2	J322110
					9	3	5
		6		R154	SW4C	SW4A	4
							1
				60.4 1%	SW440026		6

R150

3 5.76K 1%

	C44	C61	C62
		1000PJ100M3	1000PJ100M3
	10PJ100M3
			WA10
	R137		WA283449
	10.0K 1%

2 1

dbx Professional Products
8760 South Sandy Parkway
Sandy, Utah 84070
Title	dbx 166A DUAL COMPRESSOR/EXPANDER 80-6207
Size	Document Number			Rev
B	056207B6.001			B6
Date:	Thursday, October 21, 1999	Sheet	1 of	6

	OPTIONAL
	THRESHOLD TRIM
	+15V		R88
	3		OMIT
			412K 1%
P16		2
OMIT
50K420278	1
	-15V
COMPRESSOR	+15V
	1		R58
THRESHOLD			412K 1%
	2
P3
20K402121			R83
	3		10.0K 1%
	-15V

R60

4.99K 1%

RMS 1 OUT

2 1 R86 1.5M

TP2

TP500317

-15V

CHANNEL 1

		+15V
	R59	R52
		280K 1%
	10.0K 1%
		D33
		1N4148

R57

10.0K 1%

	-15V	OVER EASY
6	D28	SW1B	SW1A
	1N4148	4	1
	7	5	2
5		6	3
	U12B	SW440027
	TL074
	11
			R56
			280K 1%

R55

523K 1%

R54

523K 1%

4U12A 2 TL074

1

3

		R85	+15V
COMPRESSOR		4.99K 1%
RATIO	3	U12D
	2	TL074	R112
P4		12	20.0K 1%
		14
20K402121
		13
	1
			D39
			1N4148
			4
			5
	R84	R123	6
	100 1%	1.74K 1%	SW3B
			SW440026
			MODE

1

2 TP3 TP500317

D40

1N4148

C21

.22J

R34

10.0K 1%

R115

10.0K 1%

R114

39.2K 1%

C23

2.2M50E1

		+15V
	R35	R53
R116	1M	200K 1%
Q4
10.0K 1%
2N4402 7	1	MODE
8	2
9	3	-15V
SW3C	SW3A
SW440026
D37	R117
1N4148
	39.2K 1%
		R44
U12C		7.15K 1%
TL074
9
8
10
R113	10	R33
20.0K 1%	11	10.0K 1%
	12
C22	SW3D
2.2M50E1
	SW440026
	MODE

J105-5

J105-11

J105-9

R45	G.R. METER LINK

5.76K 1%

J105-1

C32 2.2M50E1

COMP 1 CV

GATE 1 CV

+15V
	R61
	2.49K 1%
GATE
THRESHOLD	R46
3	7.50K 1%
P1	2
20K402121	R100
1
-15V	174 1%
	U11E
	CA3046D
14	13	-15V
	12

							+15V
							R51
U11C		U11A					6.34K 1%
CA3046D		CA3046D			U11B
8	7	1	3		3		5
				1 2	CA3046D		D26
	6		2			4	1N4148
				TP5			R82
	U10A		TP500317
							7.50K 1%
	4		D25
	TL074
2			1N4148
		1
3
				R50
				2.00K 1%
+15V
U11D							J105-13
CA3046D
11	10
			R122
	9		1.5M
		-15V

C11

.047J

P2

1M402094

GATE RELEASE

	R49		R48
	124K 1%		124K 1%
+15V
			-15V
				D27
	U10B	6		1N4148
				7
	TL074	5
R47			U10D11
4.99K 1%				D38
			TL074
		12		1N4148
3
				14
2		13
1
				R119	R99
				210 1%	10.0K 1%

Q3

2N4400

R98

100K 1%

-15V	dbx Professional Products
	8760 South Sandy Parkway
	Sandy, Utah 84070
	Title	dbx 166A DUAL COMPRESSOR/EXPANDER 80-6207
	Size	Document Number			Rev
	B	056207B6.002			B6
	Date:	Thursday, October 21, 1999	Sheet	2 of	6