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REVISION RECORD
LTR REVISIONS DONE OR ECO NUMBER: DATE:
C3 C4 F1 AS PER ECR 571-2 AND 571-3 7/19/93

+ F2 ECO 571-4 B.G. 8/24/93
R1 R5
330pF 4.7/50
F4 ECO 571-7, & COMBINED 5% & 1% R VALUES1/15/95
C5
100 OHM 100 OHM Changed R150 to 10K; corrected R108/
R7 F5 R109 connections. 3/14/95
C1
R3 F6 Changed C63 to 22uF/25V non-polar. 9/13/95
SENSE MIC 1 100K0
470pF
49K9
150pF
XLR-FEMALE
J1 2 U1A SENSE 1 R11
2 1
1 3
TRIM
(FRONTPANEL 4K7
3 CW
RC4560 ADJ. TRIMMER) 3 R9
C2 50K 2 6 U1B SYMMETRY ADJ.
4 470pF R8 7
R4 1 4K7 (TRIMMER)
5
100K0
RC4560 +15VA
100K
R2 R6 R12 C6
330pF R26
49K9 CW
R10
100 OHM 100 OHM 4K7 1 3
2



-15VA
R23 R24


C9 C10 10K0 2K00 C16
R13 R17 R27
+ C12 +
330pF 4.7/50 .0022 10/35 100K0
100 OHM 100 OHM
R19 R30
C7 R28
SENSE MIC 2 R15 470pF
49K9
R20
100K0 4K7
2M2 1K37
XLR-FEMALE
2 U2A 6 4
J2
2 1
1 3 SENSE 2 CW C13 -15VA
CAP SYM
3 3
RC4560 TRIM 50K 2
1
IN U3A OUT
7
C8 (FRONTPANEL R144
4 470pF 1 .1UF
R16 ADJ. TRIMMER) THAT2252
100K0 BIAS GND
2 3
R22 C11 C15
R14 R18
49K9 330pF
R21
100 OHM 100 OHM R34 R31
4K7 73K2 .1UF

20K0 R29
R33
560K
C18
3K01 -15VA

SENSE LOG 150pF
D1
ADJUST
(TRIMMER) +15VA
100K 1N4148
R36 R35
CW 2 U4A D2
3 1 1 SENSE
2 56K 3
RC4560 1N4148
COMPANY:

-15VA
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
TITLE: REV:
DRAWN: DATED:
571 SCHEMATIC F6
DRAWING NO:
RELEASED: DATED:
021740 SHEET: 1 OF 6
FORMAT
C19
J3-2
R41 R37 PAGE/MUSIC
MUSIC
MUSIC INPUT + (REAR PANEL)
9 8 PAGE OVER
2K00 43K2 47pF

R43
R39 MUSIC
7 (FRONT PANEL)
100K0 C21 SW3C
J3-3 470pF 45K3 6 U6B
2 7
GND 6 U4B
R63
100K0 3 1 5
7 CW RC4560
5 R78
C22
R44 470pF RC4560
100K0 R81 R80
J3-1 1M 10K0




S 2




D 1
R42 R38 C40
MUSIC INPUT - C20
.039
2K00 43K2 47pF Q1
R40




G
2N5458




3
45K3




C31


R53 R57 330pF C32
R79
PAGE MIC 100 OHM 100 OHM 13K0
+
R59
INPUT C29 4.7/50
R55 470pF
100K0 49K9




10K0
PAGE MIC




R77
XLR-FEMALE R64
2 U5A VOICE C23
J4 3
2 1 TRIM 50K
2 4.7NP
1 3 (FRONT PANEL R60
3 ADJ. TRIMMER) 1 4K7
RC4560 CW C41 R82
C30 SIGNAL
4 470pF +
R56 13K0
100K0 R61 4.7/50
4K7 R73
R54 R58 R62 C33
49K9 330pF 470K
100 OHM 100 OHM C36 D3
6 U7B D4 R75
C34
7 Q2
47pF 1N4148 5
10K0 2N4401
LF353N 1N5245
150pF R68 C38
PAGE LINE R66 .47/35t
C24 + R76
INPUT 4K7
100K0
10K0
R49 R45
R72 R74
+ J3-5
47pF C28
R65 U6A C35
2 U7A R70 R71 100K0 2K00
2K00 43K2 2 1 2M2
R47 + 1 3
R51 4K7 3 100 OHM
4.7/50 LF353N
100K0 C26 .022 -24VA
45K3 RC4560
J3-6 470pF
R67
GND 6 U5B
100K0 R69
10K0
-15VA

7
5
C27
PAGE LINE R52 470pF RC4560 COMPANY:
INPUT J 3 - 4
100K0

R50 R46
+ C37
4.7/50
SYMETRIX INC.
- C25
14926 35th Avenue West
2K00 43K2
R48
47pF Lynnwood, WA 98037-2303 USA
45K3 TITLE: REV:
DATED:
DRAWN:
571 SCHEMATIC F6
DRAWING NO:
RELEASED: DATED:
021740-SCH SHEET: 2 OF 6
C44


82pF
R90A
C43 C46 J3-9
+15VA 10K0 R91
R86
61.9 OHM R90B U10A + + OUTPUT
150pF 100 OHM
2 100/35
R95 R89 1
1 2 10K0 3
VC R93
1K37 3 7 13K0 RC4560 100K0
EC1 VCC
U8 U9A
1 8 R90C
+15VA 2150A OUT 2 J3-10
IN 1 10K0 C45
SIGNAL S
Y E
V E G
C N
3 GND
M E 2 D C42 RC4560
1 470pF 82pF
4 5 2 6
THD TRIM 2
R87 R94
R88 100K0
(TRIMMER) R90E
100K 301K
3 C47 J3-8
CW R92
U9B 10K0
6 U10B + - OUTPUT
R85
7 6 100 OHM
100/35
5 R90D 7
R83 5
4K99 R84
-15VA 51 OHM RC4560 SOURCE LOG ADJ.
61.9 OHM RC4560
10K0 (TRIMMER)
SYMMETRY ADJ R108
(TRIMMER) 100K CW
-15VA
R98 +15VA 1 3
100K 2
CW
+15VA
1 3 -15VA
C51 -15VA 2
R109 R107
+
FORMAT (PAGE/MUSIC) 10/35
R99
150K0 20K0
R96 100K0 C53
SHOWN IN VOICE (IN) POSITION 100K0
R102
R100
150pF
1 2M2 1K37 D6
2 A3 SOURCE
6 4
3 CAP SYM
SW3A C49 -15VA 1N4148
R103 R97
1 7 R106
IN U11A OUT 6 U12B D7
10K0 2K00 .1UF THAT2252 7
MUSIC C48 3K01 5
12 BIAS GND
11 .0022 1N4148
RC4560
2 3
10 C50
VOICE SW3D

.1UF
R101
R149 R148 C52 560K
4
5 R104
49K9 -15VA
10K0 2K00 COMPANY:
6
SW3B
C39
.1UF
SYMETRIX INC.
.0022 14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
TITLE: REV:
DRAWN: DATED:
571 SCHEMATIC F6
DRAWING NO:
RELEASED: DATED:
021740 SHEET: 3 OF 6
J5-1
OPTIONAL OUTPUT +5VD +5VD
D17
GAIN U20B U20A U14A

J5-2 CW 3 (FRONTPANEL) 10
S
4
S IN_A0
1 +15V
9 5 19 2
2 R132 11 Q 3 Q 18 SYS_CLK IN_A1 3 1N4148
50KB-1C CLK CLK CLK 17 I/O_CLK IN_A2 4
TX 16 ADDR_IN IN_A3 5
1 R133 12 D 2 R32
J5-3 8 D 6
RX 15 DATA_OUT IN_A4 6 SENSE
100 OHM Q Q ENB 14 CS IN_A5 7 MST_VOL
13 1
R R VREF 13 REF+ IN_A6 8 MIN_LVL 1K00
MST_VOL REF- IN_A7 MAX_LVL D18
74HCT74 74HCT74 12 9
REMOTE J5-4
RATIO 11 IN_A10 IN_A8 AVG_T
+5V BP1 SOURCE IN_A9 +24VA
GAIN +5VD .01uF 1N4148
+ MC145040 DISP[00:07]
TRIM J5-5 BP3
C59
4.7/50 R145 C17
33pF
(50K LINEAR) +5VD 2
43K2 J5-6
DISP07 7 U18A