C
B
A
J3-1
+
J3-2
-
J3-3
J3-4
PHANTOM
(SHOWN OUT)
2
SW7A
R248
1K00
+
C74
47/63
MIC
65 4 3 2 1
REVISION RECORD
DATE:
11/08/95
07/05/96
RLYRLY+
J3-5
+
J3-6
-
J3-7
GND
REV:
C
OF
DD
C
B
A
7
LINE
INPUT
3
1N4742
1
R246
4K99
R247
4K99
C69
470pF, 2.5%
XLR-FEM
1
J1
C85
.001
C3
220pF
J2
1/4" TRS JACK
+55V
SH7
Z3
12V
L1
BEAD
2
3
C68
470pF, 2.5%
R244
200
R245
249
R228
100
C72
470pF, 2.5%
L2
BEAD
C71
470pF, 2.5%
C4
220pF
D70
C70
470pF
R227
100
Q16
TIP30A
R243
10K0
Q12
2N4403
R229
1K00
D68
-15V2
R2
1K00
R1
1K00
SH6
R231
2K00
C79
220pF
R234
20
470pF
D69
C1
C2
470pF
R232
2K00
330pF
R230
1K00
C53
220pF
NOTE:
1. ALL DIODES 1N4148 UNLESS NOTED
2. ALL RESISTORS IN OHMS
3. ALL CAPS IN uF UNLESS NOTED
R4
9K09
R3
9K09
4K99
Q13
2N4403
C78
R5
MIC GAIN
CW
(BACK PANEL)
R233
2K5-C
R235
10K0
.056
C8
.056
2
3
C6
100p
2
-
3
+
R236
100K
U13B
7
RC4560
C7
R8
30K1
4K99
C5
100p
U1A
+
RC4560
C73
330pF
R237
10K0
U13A
RC4560
+
R7
15K0
R6
R241
59K0
1
6
5
4.7NP
5
6
INPUT_LVL
(0 to -10dB)
LINE GAIN
(BACK PANEL)
1
R240
78K7
U1B
6
-
5
+
RC4560
R242
78K7
R238
100K
C84
U5B
+
RC4560
7
SH6
CW
R177A
10KA
R178
4K22
7
SW8A
1
3
125 Hz
(SHOWN OUT)
LOGIN
SH4,6
2
SW2A
6 KHz
(SHOWN OUT)
1
3
2
4.7NP
50K
R15
R9
6K49
R10
6K49
R11
100K
+15V
-15V
R14
13K0
C13
1
2
THD
3
CW
.0047
DRAWN:
RELEASED:
6
5
2
3
R21
10K0
C14
100p
+
R22
10K0
R23
10K0
C15
+
NE5532
R13
6K49
C10
.0022
R20
61.9
U4
EC1
18
IN
S
Y
M
R16
1M
R17
61.9
R18
61.9
C11
U2A
3
+
2
-
RC4560
C9
.0022
R
+15V
37
VCC
2150A
R19
-15V
OUT
V
E
G
E
C
N
E
2
D
4K99
R35
1K21
SH6
VCA_CV
133 mV/dB
1
6254
R12
6K49
DATED:
B 3/21/95
DATED:
U3B
7
NE5532
22pF
U3A
1
C12
.0047
COMPANY:
TITLE:
DRAWING NO:
5
6
R24
100
C17
47NP
R26
R25
100
U2B
+
-
RC4560
100K
C16
47NP
7
LTR
3.0 REMOVE DE-THUMP, "FINALIZE" COMP VALUES 09/21/95
A.0
B.0 CHANGE C9-12 TO METALIZED POLY 04/05/96
B01
C Add R187,R210,C80,C81 (sheet 6) per ECN138 04/14/99
RL1
1
2
8
7
160035
R27
100K
R31
10K0
C19
100p
10K0
REVISIONS DONE OR ECO NUMBER:
"FINALIZE" COMPONENT VALUES AGAIN,
FIX EXPANDER THRESHOLD, RELEASE TO PRODUCTION.
Chg fuse text to reflect changed values.
4
5
2
3
1/4" TRS JACK
R28
10K0
C18
100p
1
XLR-MALE
J4
4
SH5
R30
R29
10K0
3
6
2
3
U5A
+
RC4560
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - AGC LEVELER
52 421M 1 1
SHEET:
SH7
SH7
1
J5
OUT_LVL
C
ARM
LOG_OUT
65 4 3 2 1
+15V
SH4
R38
4K99
SH4
R70
10K0
"ON" IN AUTO
R65
1M
D53
Q3
2N5458
Q1
2N5458
U6A
2
-
3
+
R69
4K99
R37
200K
U6B
6
-
5
+
LM324
LM324
D1
7
R56
768K
1
R36
1M
(CAUSES GAIN TO DECREASE IF STEADY STATE
SIGNAL PRESENT, SUCH AS FEEDBACK)
R66
4K99
D8
R39
2K67
"OFF" IN AUTO
D10
R68
383K0
.47uF
+15V
R67
383K0
20K0
C21
R40
10
9
D2
R41
1M
U7C
+
LM324
8
R44
20K0
(FRONT PANEL)
R42
1K00
D3
D4
R43
500KA
2
1
EXPANDER
RELEASE
D5
3
CW
R49
100
Q2
2N4401
R51
9K09
U7D
12
+
-
14
LM324
R48
10K0
13
R45
2K00
+
C23
C24
2.2
4.7NP
R47
150K0
R46
1M
R50
13K0
R64
13K0
R278
4K99
U7A
2
-
3
+
LM324
D17
D93
1
R52
10K0
5
6
+
-
EXP_CV
SH3
U7B
7
LM324
GREEN
R55
4K99
D6
IN15
SH7
EXPAND
DD
C
B
A
R113
1K21
AUTO
EXPANDER
THRESHOLD
(FRONT PANEL)
BYPASS
+15V
1
CW
-15V
R58
50KB
2
3
R57
10K0
R60
383K0
R59
13K0
-15V
R71
10K0
R112
10K0
R72
3M3
-15V
R74
10K0
R61
4K99
LOW WHEN IN AUTO
U6C
9
10
+
LM324
8
R73
10M
R63
2M2
13
12
R62
10M
U6D
+
LM324
R54
20K0
R103
10K0
14
D7
HIGH WHEN EXP IN BYPASS
R75
10K0
OPEN WHEN IN AUTO
Q17
2N4401
D9
R249
10K0
-15V
DRAWN:
RELEASED:
R
B 3/21/95
DATED:
DATED:
COMPANY:
TITLE:
DRAWING NO:
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - EXPANDER
52 421M 1
SHEET:
2
REV:
OF
B
A
C
7
65 4 3 2 1
C
B
LOG_OUT
SH4
R76
50KB
OUTPUT LIMITER
THRESHOLD
50K
R77
THRESHOLD
TRIM
RATIO_BUF1
SH4
+15V
CW
-15V
+15V
-15V
CW
3
1
+15V
D71
R80
R91
R92
158K0
2
3
R90
30K1
U9A
+
LM324
1
3
1
2
R78
2
249K0
R79
200K
40K2
49K9
5
6
R82
2K37
U25B
+
RC4560
R81
30K1
D11
R93
49K9
R83
7
100
R97
59K0
R94
49K9
U9B
6
-
5
+
LM324
D12
R95
10K0
R96
1M
R259
10K0
7
D92
+
Q19
2N5458
RATIO_BUF2
D15
R260
100K
10
C20
2.2
9
C83
4.7NP
-15V
+15V
LM324
+
U9C
R85
R84
200K
10M
10
SH4
8
9
U9-8 should go high for
about .5 seconds when the
ratio pot is turned CCW.
CAUSES C20 TO DISCHARGE RAPIDLY.
12
13
U8C
+
LM324
U8D
+
-
14
LM324
C22
22pF
D13
R86
15K0
D63
8
POSITION OF RATIO POT
EXP_CV
R87
10K0
4
5
R88
10K0
AGC OR LIMITER
CONTROL VOLTAGE
SH2
U20B
+
15K8
R101
35K7
R102
30K1
LM339
R99
2
R89
4K99
13
12
R98
20K0
U9D
+
LM324
IN15
SH7
+15V WHEN UNIT IS ENABLED
D14
RED
LIMIT
CV
SH6
14
DD
C
B
A
TARGET
OUTPUT
LEVEL
(FRONT PANEL)
50KB
R32
+15V
CW
-15V
R100
49K9
1
R33
2
200K
3
R34
158K0
C76
.47uF
3
2
U25A
+
RC4560
1
DRAWN:
RELEASED:
R
B 3/21/95
DATED:
DATED:
COMPANY:
TITLE:
DRAWING NO:
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - LIMITER
52 421M 1
SHEET:
3
REV:
OF
A
C
7
C
B
A
65 4 3 2 1
R111
LOGIN
SH1
EXT_LOGIN
SH6
U11 INPUT HAS LOW CUT TO
AVOID ROOM "RUMBLE" FROM
"FOOLING" THE ARM CIRCUIT
AUTO RELEASE
10K0
R209
10K0
+15V
1
R104
50K
3
SYM
-15V -15V
R119
10K0
R120
10K0
+15V
50KB
R127
LEVEL
(FRONT PANEL)
2
CW
+15V
R109
C32
4.7NP
R117
CW
1M
R106
49K9
20K0
1M
C33
.1uF
R114
49K9
3
1
R105
R115
2
R107
20
.01uF
1
20
C27
.01uF
1
C30
IN
6
CAP
IN
SYM5VEE2BIAS3GND
4
6
CAP
SYM5VEE2BIAS3GND
4
-15V
R128
20K0
R129
49K9
C28
10
+
8
VCC
OUT
THAT2252
R108
536K
C31
10
+
8
VCC
OUT
THAT2252
R116
536K
+15V
U10
7
U11
7
-15V
R118
1K00
C36
47NP
R110
1K00
C26
4.7NP
+15V
R123
100K
C29
4.7NP
5
6
-15V
U16B
+
LM324
THRESH
1
2
R141
50K
3
CW
SH2
200K
-15V
U14A
3
+
2
LM324
R121
20K0
R122
2K00
7
R143
30K1
R144
1K00
LOG_OUT
R162
1
R161
10K0
D16
C35
4.7NP
RESISTORS AROUND U15A CAUSE A
D25
Q8
R159
1M
R164
10K0
R167
536K
R151
R134
D91
1M
100K
6
5
2N5458
R152
10K0
LM324
+
U12B
D28
Q7
2N5458
D23
7
R142
20K0
U14B
6
-
5
+
6
-
5
+
R163
15K0
LM324
U8B
LM324
R124
10K0
7
7
Q4
2N4401
D18
R125
499
+15V
R131
357K0
10
9
R126
49K9
U14C
+
-
D26
20K0
40K2
10
9
LM324
R145
1M
C39
22pF
R147
R148
U12C
+
LM324
D20
R130
200K
8
D19
R146
1K00
SW3A
2
8
U12D
12
+
13
-
D27
3
1
LM324
150K0
+
R132
1K00
R133
+15V
R150
10M
14
Q6
2N4401
R149
2K00
C40
10
357K0
3
2
R166
+
-15V
U12A
+
LM324
-15V
C41
22
R165
12
13
13K0
U14D
+
-
5
1
5
6
LM324
SW3B
R160
1K00
U15B
+
-
7
LF353N
14
(FAST)
4
6
(SLOW)
RESPONSE
+15V
C37
47NP
D21
LOW DURING STEADY
STATE SIGNAL INPUT
R168
226K
COMPANY:
CONTROLLED "LEAKAGE" INTO C42 WHEN
IN HOLD MODE. CAUSES GAIN TO
SLOWLY DECREASE DURING LONG HOLD
R215
10M
U15A
3
C42
.47uF
+
2
-
R214
1M
1
LF353N
R155
649
-15V
50KB
R153B
CW
CW
3
2
1
6
5
4
TEST
3
2
1
NORMAL
SH2
-15V
LOW WHEN RATIO CCW
J8
D22
R135
ARM
10K0
1M
R136
C38
.47uF
D56
R208
4K99
2
3
U16A
1
LM324
U8A
+
LM324
R154
30K1
50KB
R153A
RATIO
(FRNT PAN)
R156
14K3
2
3
+
R137
1
4K99
-15V
9
10
R157
40K2
13
12
R158
71K5
R138
59K0
U16C
+
LM324
U16D
+
LM324
R139
121
ACTIVE
8
RATIO_BUF2
SH3
RATIO_BUF1
SH3
14
IN15
SH7
ACTIVE WHEN
NOT DISABLED
D24
GREEN
DD
C
B
SYMETRIX INC.
DRAWN:
RELEASED:
-15V
R
B 3/21/95
DATED:
DATED:
TITLE:
DRAWING NO:
14926 35th Ave. West
Lynnwood, Wa, 98037
421M AGC/ARM
52 421M 1
SHEET:
4
REV:
OF
C
7
A
65 4 3 2 1
+15V
DD
D30
R169
121
D29
C
B
A
OUT_LVL
SH1
C44
4.7NP
R170
10K0
R189
10K0
R191
10K0
Q9
2N4403
R171
357
2
3
R196
10
R190
10K0
D44
U21A
+
R195
30K1
-54VU - 4 8 - 4 2 - 3 6 - 3 0 - 2 4 -18 -12 - 6
D31
13
-11+
10
RC4560
GREEN
U17C
LM339
R172
249
1
C45
4.7NP
D45
2
CW
R192
499
C43
4.7NP
+15V
-15V
8
1
3
D32
GREEN
14
U17D
LM339
-9+
R173
499
R193
10K0
R194
50K
LO LEVEL
CAL
1
-7+
6
D33
GREEN
U17A
LM339
R174
1K00
D34
2
4-5
GREEN
U17B
LM339
+
R175
2K00
5
6
R197
1K21
D35
13
-11+
10
+
-
U21B
GREEN
U18C
LM339
R176
4K02
RC4560
R198
59K0
+15V
7
14
-9+
8
D36
GREEN
LM339
U18D
R179
24K9
D37
1
-7+
6
DRAWN:
RELEASED:
D38
GREEN
U18A
LM339
R181
249
R180
249
R
B 3/21/95
2
4-5
GREEN
U18B
LM339
+
R182
499
DATED:
DATED:
-11+
10
D39
13
LM339
R183
1K00
GREEN
U19C
D40
14
LM339
-9+
8
COMPANY:
TITLE:
DRAWING NO:
0VU
GREEN
U19D
R184
2K00
1
-7+
6
D41
GREEN
U19A
LM339
6
R185
4K02
D42
2
4-5
12
GREEN
U19B
LM339
+
R186
1K50
-7+
6
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - OUTPUT METERING
52 421M 1
CLIP (+14VU)
D43
RED
1
LM339
U20A
R188
15K8
-15V
SHEET:
+15V
5
REV:
OF
C
B
A
C
7
C
B
A
EXT_LOGIN
RLY-
RLY+
INPUT_LVL
65 4 3 2 1
STEREO LINK
LOGIN
SH7
SH7
SH1
SH1
SH4
C77
4.7NP
U24D
13
12
8
J11
3
3
5
5
2
2
4
1
4
1
STEREO LINK
+15V
-15V
1
2
3
4
5
6
+
LM324
U24C
LM324
R53
1K00
J7
14
+
-
R217
10K0
C55
4.7NP
8" RIBBON CABLE
R218
100
10
9
(MASTER)
SW6C
8
(SLAVE)
(TO DAUGHTER BOARD)
R140
1K00
7
9
R224
1K00
R223
100K
(MASTER)
SW6A
RL2
1
2
8
7
160035
SH7
7
4
5
3
6
2N5458
EXT_SLAVE
U24B
6
5
+
LM324
D57
1N4003
D
Q5
S
2
D58
D59
R222
10K0
G
R221
1M
STEREO LINK
(MASTER)
10
SW6D
12
(SLAVE)
2
3
U24A
+
LM324
1
(SLAVE)
11
3
1
SH3
SH1
SH7
CV
VCA_CV
-24V
C58
.1uF
C59
.1uF
U15C
VCC
U17E
8
U1C
RC4560
4
4
U6E
LM324
11
8
LF353N
4
+15V
3
LM339
12
-15V
U20C
10
-
11
+
DRAWN:
RELEASED:
VCC
LM339
+15V
8
U2C
RC4560
4
4
U7E
LM324
11
+15V
8
U3C
NE5532
4
-15V
LM339
VCC
U19E
8
9
3
LM339
12
U20D
+
LM339
DATED:
DATED:
3
U18E
12
13
R
B 3/21/95
14
U8E
C56
.1uF
C57
.1uF
4
11
VCC
U20E
8
U5C
RC4560
4
LM324
3
LM339
12
COMPANY:
TITLE:
DRAWING NO:
U9E
U21C
4
11
8
RC4560
4
LM324
U25C
4
U12E
11
1
MTHOLE4
1
MTHOLE4
1
MH3
MH156
1
MH4
MH156
1
MH5
MH156
8
4
RC4560
LM324
H1
H2
R187
100 OHM
R210
100 OHM
U14E
4
11
LM324
1
1
1
1
1
+
+
MH6
MH156
MH7
MH156
MH8
MH156
MH9
MH156
MH10
MH156
C80
100/35
C81
100/35
U16E
4
11
+15V2
LM324
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - STEREO LINK/PWR DIST
52 421M 1
SHEET:
U13C
U24E
8
4
RC4560
4
LM324
11
6
-15V2
SH1
REV:
OF
DD
C
B
A
C
7
65 4 3 2 1
+55V
SH1
D66
+70 TO +75V
Q10
TIP29A
D
C
J9
MAINS (IEC)
2
3
1
J10
FUSE
.25A @ 115VAC
.125 A @ 230VAC
2
SW4A
CUT IF SW-4
INSTALLED
+15V
NOTE:
1
3
J9, J10, SW4, SW5, T1 not
on European version.
SW5
230 VAC115 VAC
120028
1
6
2
5
12
T1
J6
EXT PWR
7
11
8
10
C46
1
R199
10
100/100
2
3
C25
+
4
0 OHM
5
R216
+
100/100
6
C75
D64
1N4003
D46
1N4003
D47
1N4003
USED ON EUROPEAN
VERSION ONLY.
D49
1N4003
D48
1N4003
1N4003
1N4003
D65
1N4003
D67
+24V
C47
1000
C48
1000
-24V
+
+
+
SH6
C34
100/100
47/63
LM2940CT-15
R225
10K0
C52
J13
IN
J12
VIN
+
HS_6021
OUT
U22
GND
HS_6021
U23
VOUT
79M15
GND
Z1
1N4742
12V
C49
4.7NP
C50
4.7NP
Z2
1N5260
43V
R226
20K0
R201
0 OHM
R200
0 OHM
+15V
-15V
C60
.1uF
C61
.1uF
C62
.1uF
C65
.1uF
C63
.1uF
C66
.1uF
C64
.1uF
C67
.1uF
D
C
B
A
IN15
EXT_SLAVE
SH2,3,4
D50
1N4003
D51
SH6
STEREO
D52
BYPASS
(SHOWN BYPASSED)
R204
2K00
(MASTER)
SW6B
5
(SLAVE)
SW1B
5
LINK
6
4
6
4
R203
20K0
R207
20K0
D61
.01uF
D60
D62
R206
200K
R202
10K0
C51
.1uF
R205
10K0
DRAWN:
RELEASED:
LOW WHEN ENABLED
Q11
2N4401
R
B
DATED:
3/21/95
DATED:
C54
.1uF
COMPANY:
TITLE:
DRAWING NO:
RLY+
SH1,6
D55
1N4003
RLY-
SH1,6
SYMETRIX INC.
14926 35th Avenue West
Lynnwood, WA 98037-2303 USA
421M - POWER
52 421M 1
SHEET:
7
REV:
OF
B
A
C
7
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