Forum FOH
Schematics
Klark Teknik Building
Walter Nash Road
Kidderminster
Worcestershire
DY11 7HJ
Tel: +44 (0) 1562 741515
Fax: +44 (0) 1562 745371
Email: info@uk.telex.com
Website: www.ddaconsoles.com
Forum FOH Schematics
Telex Communications (UK) Limited
In line with the company’s policy of continual improvement, specifications and function maybe subject
to change without notice. This Operator Manual was correct at the time of writing. E&OE.
Date: July 11, 1994 Sheet 1 of 1
Size Document Number REV
D CD1209-1 A
Title
FORUM STANDARD INPUT
TEL:(0)81-570-7161 FAX:(0)81-577-3677
DDA LTD., HOUNSLOW, MIDDX., TW3 2EB, ENGLAND
EQ
R35
47K
R36
75R
C17
33P
R33
1K2
C20
100/16
SW4
SW SPDT
R28
10K
R29
10K
R34
47K
C15
15N
C18
470N
R32
1K2
12
13
14
IC2D
TL074
4
5
6
VR6B
100KC
1
2
3
VR6A
100KC
10
9
8
IC2C
TL074
VR7
10KA
C19
470N
C16
33P
R20
1K5
R21
1K5
R22
47K
R23
47K
R24
10K
R25
10K
C10
3N3
C13
2N2
5
6
7
IC2B
TL074
VR2
10KB
3
2
1
4
1
1
IC2A
TL074
1
2
3
VR4A
100KC
4
5
6
VR4B
100KC
C11
33P
HIGH PASS
R16
15K
R17
30K
R19
10K
C8
100N
C9
100/16
R18
75R
5
6
7
IC3B
TL072
SW3
C7
100N
R13
10K
C5
33P
R15
10K
PHASE
C6
100/16
SW2
R102
10K
R9
1K5
R8
1K5
R14
75R
R103
220K
R12
10K
3
2
1
8
4
IC1A
TL072
1
2
3
VR1A
5K RD
C48
100/16
R7
10K
C4
10P
MIC/LINE
R4
7K5
R5
10K
R6
10K
C2
33P
C3
100/16
5
6
7
IC1B
TL072
SW1
TIP
RING
LINE
R1
15K
R2
15K
R3
7K5
C1
33P
2
1
3
4
5
JS1
1/4JACK
IN+
+48V
IN-
XLR2
R87
6K8 1%
R88
6K8 1%
R89
470
R90
1K5
C44
2.2/63
SW6
SUJ2
+48V
R92
10K
C36
47/63
D1
12V
R11
75R
LK1
V+
C39
22/25 C41
1000U
R104
22R
R10
330R
R96
10R
R97
10R
4
5
6
VR1B
5K RD
3
2
1
8
4
IC3A
TL072
R146
100K
R145
100K
R112
150K
R26
3K3
R27
3K3
C12
4N7
R149
100K
R148
100K
R147
100K
V+
R107
100K
D9
18V
Q5
BC550
R30
3K3
R31
3K3
C14
33N
-13
TO SOLO LED
VR3
10KB
VR5
10KB
D10
GRN
R37
10K
GRP 1
GRP 2
R55
10K
R56
10K
+17
+10
0
-7
V-
D14
RED
D13
GRN
D12
GRN
D11
GRN
R54
10K
SW8
SW9
V-LED
V-
V-
C46
2U2
63V
C47
22U
25V
R109
100K
R108
100K
R105
100K
R106
100K
Q4
BC550
Q3
BC550
Q2
BC550
Q1
BC550
V-V-
C45
2U2
63V
R114
47K
1 2 3 4 6 9
57
8
IC7
BA6144
R113
9K1
V-
R98
10K
C38
220P
C40
22/25
C42
100/16
R95
10R
3
2
6
5
1
8
7
4
IC4
SSM2017
R93
10K
R94
24K
C37
47/63
D2
12V
D3
12V
D4
12V
T1
NTM1
LK2
R100
2K2
(OPT)
IN-
-20dB
MIC
XLR3
R91
1K5
C43
10N
R99
10R
R101
330R
SW5
SCREEN
-17V
R116
30K
Q6
BC560
R115
62R
+17V+17V
D8
1N4148
D7
1N4148
V+
C21
220N
5
6
7
IC5B
NE5532
R41
75
C23
220
R45
43R
R44
22K
R42
10K
1
2
3
VR8A
10K
R48
4K7
R49
3K3
R50
100K
R52
3K3
C24
33P
C25
100/16
3
2
1
8
4
IC6A
TL072
R57
10K
R58
10K
R59
10K
R60
10K
R61
10K
SW10
SW11
GRP 3
GRP 4
GRP 5
GRP 6
GRP 7
GRP 8
L MIX
R MIX
R62
10K
R63
10K
SW12
R51
4K7
R53
100K
C26
33P
C27
100/16
5
6
7
IC6B
TL072
R40
10K
R46
22K
R47
27R
4
5
6
VR8B
10K
R43
10K
V-
1
2
3
POT610KALPS
R39
4K7
C22
33P
R38
560K
TO SOLO SW
ON
D5
LED
LK5
SW7
LK4
TIP
RING
INSERT
RING NORMAL
2
1
3
4
5
JS2
1/4JACK
CHASSIS EARTH
PRE FADER
3
2
4
1
-17V
+17V
5
6
7
8 LK7
LK6 PRE FDR
PRE EQ
PRE
VR9
20K
SW13
SW SPDT
R64
100K
R65
10K
R66
10K
C28
100/16
3
2
1
8
4
IC5A
NE5532
C29
33P
SW14
DIRECT
TIP
RING
R67
75
R68
10K
C31
100/16
C30
33P
R69
10K
R71
75R
DIRECT
R70
10K
2
1
3
4
5
JS3
1/4JACK
AUX 1
AUX 2
AUX 1
AUX 2
R72
10K
R73
10K
R74
10K
R75
10K
3-4
5-6
SW15
VR10
20K
VR11
20K
VR12
20K
-POST FDR
PRE FDR
LK4
LK3
LK2 PRE EQ
EARTH TERMINAL
V+
MIC AMP V+
R83
10
C34
22/25
C35
22/25
9
10
+18V
+48V
0V
+48V
+18V
0V
0V
+18V
R81
10
C32
220/25
C33
220/25
AUX EARTH REF
MIX EARTH REF
AUX POT EARTH
PAN BUFFER EARTH
-18V
-18V
-18V
R82
10
R85
10K
R86
10K
V-
MIC AMP V-
R84
10
LAST R
LAST C
R99
C43
NOTES
LED METERING NOT SHOWN
FROM CUT LED
LK1
LK5
PFL
AFL
SOLO
V-
R78
47K
R79
10K
D6
LED R
SW16
SOLO ENABLE
SOLO AUDIO
AUX 1
AUX 2
R76
10K
R77
10K
Date: February 2, 1995 Sheet 1 of 1
Size Document Number REV
D CD1217-3 A
Title
FORUM MUTE INPUT (PC1340-3)
TEL:(0)81-570-7161 FAX:(0)81-577-3677
DDA, HOUNSLOW, MIDDX, TW3 2EB, ENGLAND.
INSERT
SEND
C32
100U
16V
2
1
3
4
5
CON2
1/4JACK
R80
75R
R79
10K
1 2
LK16
1 2
LK17
1 2
LK18
1 2
LK19
LINK-OPT
1 2
LK20
LINK-OPT
LINKS 16, 17, 18, 21
FOR SINGLE JACK INSERT
EQ
LED2
RED
C30
33P
C31
33P
C29
100U
16V
SW6
2PSUJ
5
6
7
IC7B
NE5532
R74
10K
R73
10K
R75
10K
R76
75R
R77
10K
R78
10K
LED2 LED3
METERINPUT
HIGH PASS
C14
100N
SW5
2PSUJ
5
6
7
IC3B
TL072
C15
220N
R48
15K
R49
30K
R50
10K
0 REV
HIGH PASS FILTER
18dB/OCTAVE, 80Hz
C11
33P
C12
100U
16V
C13
100N
SW4
2PSUJ
3
2
1
8
4
IC3A
TL072
R40
10K
R41
10K
R47
10K
V-
V+
PHASEMIC/LINE GAIN
5
6
7
IC2B
TL072
C9
33P
C10
100U 16V
4
5
6
VR1B
5KRD
R33
3K3
R34
1K5
R36
62R
R35
220K
R37
3K9
R38
1K5
R39
10K
LED2
REVERSE
MIC/LINE
LED1
GRN
C7
1000U
6.3V
C8
100U
16V
1 2
3
VR1A
5KRD
SW3
4PSUJ
R11
10R
R12
100K
R14
7K5
LED1
MIC INPUT
3
2
6
5
1
8
7
4
IC1
SSM2017
C4
220P
8 2
6 4
1
T1 ( OPT)
NTM1
R8
12K
R10
24K
v1+
D1
12V
D2
12V
R7
(OPT)
2K2
-20dB
+48V
MIC
C2
33U
63V
C1
2U2
63V
R1
470R
R3
6K8
R2
6K8
R4
1K8
SW1
2PSUJ
SW2
2PSUJ
R6
360R
+48V
1
2
3
CON5
3WAY
WIR
R203
10R
SPLIT
C3
33U
63V
R5
1K8
C5
10N
R15
100R
1
2
3
CON6
3WAY
MH
R204
10R
v1-
D3
12V
D4
12V
R9
12K
GAIN = 10 TO 60dB
C58
22U
25V
C59
22U
25V
R13
10K
R173
10R
R174
10R
V+ V1+
GAIN = 0 TO 10dB
GAIN = -10 TO +20dB
MIC
LINE
3
2
1
8
4
IC4A
TL072
C17
33P
C16
3N3
1 2
3
VR2
10KB
5
6
7
IC4B
TL072
R51
1K5
R52
1K5
R53
47K
R54
47K
R55
10K
R56
10K
V-
V+
1 2
3
VR3
10KB
3
2
1
8
4
IC5A
TL072
R59
10K
R60
10K
R63
1K2
V-
V+
C21
33P
C19
470N
C18
470N
R64
1K2
R66
47K
V+
V-
C41
33P
C42
100U
16V
3
2
1
8
4
IC6A
NE5532
3
2
1
8
4
IC7A
NE5532
C62
22U
25V
C63
22U
25V
R84
12K
R90
10K
R175
10R
R176
10R
V2+
V3+
V2+ V2-
V2-
R201
10K
INSERT
RETURN
DIRECT
OUT
C40
33P
R81
12K
R82
12K
R83
12K
2
1
3
4
5
CON3
1/4JACK
1
2
LK21
LINK
LINKS 19 AND 20
FOR DOUBLE JACK INSERT
MIX
C36
100U
16V
R95
10K
R96
75R
2
1
3
4
5
CON1
1/4JACK
SW9
4PSUJ
LED10
GRN
R119
10K
LED10
C34
33P
C35
33P
C64
22U
25V
C65
22U
25V
R91
10K
R92
75R
R93
10K
R94
10K
V3+
V3-
V3-
C46
33P
C22
100U
16V
5
6
7
IC5B
TL072
R67
10K
R107
22K
R113
4K7
R114
3K3
R177
10R
R178
10R
V+
V-
R108
22R
C24
2N2
C25
33N
C26
15N
1
2
3
VR6A
100KC
4
5
6
VR6B
100KC
1
2
3
VR5
10KB
1
2
3
VR7
10KB
R61
3K3
R62
3K3
R65
47K
FADER
STANDARD AUTOMATED
1
2
3
VR4A
100KC
4
5
6
VR4B
100KC
C23
4N7
R57
3K3
R58
3K3
123
CON10
3WAY
MH
123
CON11
3WAY
MH
FADER
123
WIR1
3WAY
WIR
123
WIR2
3WAY
WIR
FADER LINK WIRE
V1-V-
LINK FOR -10dBV
LINE INPUT
3
2
1
8
4
IC2A
TL072
C37
33P
C38
33P
C39
100U
16V
1 2
LK3
LINK-OPT
R20
12K
R21
12K
R22
3K
R23
3K
R24
3K
R25
3K
R26
1K
R27
10K
V1+
V1-
LINE
2
1
3
4
5
CON4
1/4JACK
TAPE
1
2
3
CON7
3WAY
MH
D8
1N4148
LED16
RED
LED17
RED
SW16
2PSUJ
SW17
2PSUJ
MUTE1
LED16
C69
47N
VDD
R190
1K
FADER BUFFER
MUTE RET
R101
220K
1
2
3
4
5
6
7
8
9
10
CON9
10WAY
MHL
VSS
C43
220N
R102
680K
C44
33P
C45
220U
25V
5
6
7
IC6B
NE5532
R103
4K7
R104
75R
R105
10K
1 2
LK22
LINK-OPT
AFL
R202
10K
SERIES
SHUNT
V+
V-
V+
14
AI
4
AO
6
AC
2
BI
11
BO
9
BC
13
V-
7
0V
1
0V
3
0V
5
0V
12
0V
10
0V
8
IC13
SSM2402
PAN BUFFER
3
2
1
8
4
IC8A
TL072
5
6
7
IC8B
TL072
C48
33P
1
2
3
VR20A
10KB
4
5
6
VR20B
10KB
R111
10K
R117
3K3
V-
V+
PAN IN
C47
100U
16V
C49
100U
16V
R115
100K
LEDS1
GRN
SW1S
4PSUJ
LEDS1SLEDS1
PANLIN PANLINS
R120
10K
MIXR
MIXL
PANRS PANR
2
4
R125
10K
R126
10K
LED11
GRN
LED12
GRN
SW24
2PSUJ
BUS2
BUS1
GRP1S GRP1
1
3
R118
100K
LEDS2
GRN
LEDS3
GRN
SW2S
2PSUJ
PANRIN PANRINS
MONOIN MONOINS
R109
22K
R110
33R
R112
10K
R116
4K7
V+
14
AI
4
AO
6
AC
2
BI
11
BO
9
BC
13
V-
7
0V
1
0V
3
0V
5
0V
12
0V
10
0V
8
IC15
SSM2402
R137
47K
R138
10K
CUEDC
CUEAUDIO
V-LED
1 2
LK23
LINK
PFL
SERIES
SHUNT
V+
V-
IC15 FITTED ONLY WHEN
PRE FADE AUX MUTING
NOTE
IS REQUIRED.
OTHERWISE LINK
SOLO
MIDI MUTE
MUTE OUT
SW11
2PSUJ
LED24
YEL
123
CON12
3WAY
MH
1 2
LK13
LINK
1 2
LK14
LINK-OPT
1 2
LK15
LINK-OPT
LED24
VDDVDD
MOMENTARY
LOW TO CUT
HIGH TO CUT
R189
100K
TR8
BC182
VDD 5
6
4
IC12B
CD4011 8
9
10
IC12C
CD4011
CUT
RESET
R184
100K
R185
100K
R186
2K2
R187
4K7
R188
150K
C68
22U
25V
TR7
BC182
SW14
2PSUJ MOM
D
5
Q
1
CLK
3
Q
2
R
4
S
6
IC11A
4013
VDD
VDD
VDD
VSS
VSS
VSS
CUT SWITCH
LED18
RED
LED19
RED
D9
1N4148
D10
1N4148
SW18
2PSUJ
MUTE2
MUTE3
1
2
3
CON16
3WAY
MH
LED20
RED
D11
1N4148
D12
1N4148
SW19
2PSUJ
SW20
2PSUJ
MUTE4
MUTE5
SAFE
R196
220K
LED15 LED16
VSS
VSS
R199
220K
1
2
3
IC12A
CD4011
R200
10R
VIN
1
0
V
2
VOUT
3
IC14
78L05
SW28
2PSUJ
LED15
YEL
D5
D6
TR6
BC212
R157
75R
D16
D17
SHUNT
V+LED V+LED V+LED
VSS
ON LAMPR191
100K
R192
100K
R193
100K
R194
100K
TR9
BC212
TR10
BC182
LED4
GRN
R197
75R
TR11
BC212
LED4
LED5
SERIES
LED4
PANRIN
PANLIN
GRP7
GRP5
GRP3
GRP1
PANR
MONOIN
LEDS1
V+LED
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
CON14
16WAY
IDCBX
V-LED
1 2
LK4
LINK-OPT
1 2
LK6
LINK
PINS 4 AND 11
PRE
DIRECT
POST ON
PRE EQ
SW7
2PSUJ
1
2
3
VR16
20KA
LED3
GRN
SW15
4PSUJ
LED3
5
R133
10K
LEDS4
GRN
SW3S
2PSUJ
SW4S
2PSUJ
AUX1
LEDS1
6
R130
10K
R127
10K
R128
10K
LED13
GRN
SW25
2PSUJ
SW26
2PSUJ
BUS3
BUS4
BUS6GRP5S GRP5
GRP3S GRP3
8
R129
10K
R131
10K
R132
10K
LED14
GRN
SW27
2PSUJ
BUS5
BUS7
BUS8
LED4S LED15
GRP7S GRP7
SUBGND
SUB BOARD
7
R134
10K
R135
10K
R136
10K
LEDS5
GRN
SW5S
2PSUJ
AUX4
AUX3
AUX2
PRE
POST ON
PRE EQ
SW8
2PSUJ
1
2
3
VR17
20KA
1
2
3
VR18
20KA
1
2
3
VR19
20KA
1 2
LK7
LINK-OPT
1 2
LK9
LINK
TR1
BC182
R144
100K
R156
100K
LED5
GRN
LED5
LED10
SUBGND
LED4S
PANRINS
PANLINS
GRP7S
GRP5S
GRP3S
GRP1S
PANRS
MONOINS
LEDS1S
SUBGND
V+LED
D7
18V
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
CON15
16WAY
IDCVF
R152
100K
R153
100K
R154
100K
R155
100K
R158
33K
1
2 PL1
1/4"RPB
R198
33KLED1
METERINPUT
V-LED V-LED
C56
220U
25V
C60
22U
25V
R169
10R
R171
10R
+48V
V+
V+LED
VSS
VDD
C70
2U2
63V
C71
2U2
63V
LED21
RED
LED22
RED
D13
1N4148
SW21
2PSUJ
SW22
2PSUJ
+18V
0V
+48V
MUTE6
LED23
RED
D14
1N4148
D15
1N4148
SW23
2PSUJ
-18V
MIXREF
AUXREF
MWKGROUND
MUTE7
MUTE8
LED24
PAN BUFFER EARTH
C57
220U
25V
C61
22U
25V
R161
0R
R162
0R
R170
10R
R172
10R
R195
0R
VSS
V-
V-LED
AUX POT EARTH
R159
10K
R160
10K
C53
2U2
63V
C54
2U2
63V
1 2 3 4 6 9
57
8
IC9
BA6144
R149
15K
R150
910R
R151
47K
V-LED V-LEDV-LED
V+
V-
1 2 3
CON17
3WAY
MH
VCA POWER
C55
22U
25V
TR2
BC182
TR3
BC182
TR4
BC182
TR5
BC182
R145
100K
R146
100K
R147
100K
R148
100K
LED6
GRN
LED7
GRN
LED8
GRN
LED9
RED
V-LED
V-LED
V-LED
+17
+10
0
-7
-13
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
CON8
34WAY
IDCMH
1 2
LK10
LINK-OPT
0V
0V
0V
0V
0V
0V
-18V
-18V
-18V
+18V
+18V
+18V
MIXR
MIXL
CUEAUDIO
BUS1
BUS2
BUS3
BUS4
BUS5
BUS6
BUS7
BUS8
AUX3
+48V
AUXREF
MIXREF
MWKGROUND
AUX6
AUX5
AUX4
AUX2
AUX1
CUEDC
MUTE1
MUTE3
MUTE5
MUTE7
1 2
LK12
LINK
PRE
POST ON
PRE EQ
1
2
3
VR21
20KA
1
2
3
VR22
20KA
SW12
2PSUJ
1 2
3 4
5 6
7 8
9 10
CON13
10WAY
IDCMH
MUTE2
MUTE4
MUTE6
MUTE8
LAST R
LAST C
LAST CON
LAST D
LAST LED
LAST IC
LAST TR
LAST SW
R204
C71
LED24
SW28
LAST VR VR22
LAST LK
IC15
LK23
TR11
D17
CON17
R179
10K
R180
10K
AUX6
AUX5
D
9
Q
13
CLK
11
Q
12
R
1
0
S
8
IC11B
4013
VSS
VSS
12
13
11
IC12D
CD4011
Date: June 30, 1993 Sheet 1 of 1
Size Document Number REV
D CD1191-A A
Title
FORUM STEREO INPUT
Tel: (0)81-570-7161 Fax: (0)81-577-3677
DDA, HOUNSLOW, MIDDX, TW3 2EB, ENGLAND.
R39
1K2
C22
33P
R41
47K
R32
10K
R33
10K
12
13
14
IC4D
TL074
C18
47N
R37
470
C20
470N
1 2
3
VR7A
10KB
R38
1K2
C21
470N
R40
47K
90Hz to 1.3kHz
C16
6N8
R26
10K
R27
10K
12
13
14
IC13D
TL074
R31
470
600Hz TO 8.8kHz
R22
1K5
1 2
3
VR2A
10KB
R23
1K5
C15
33P
C14
3N3
L CUT
L CUT AND R CUT = MONO
R13
75
C9
100U
16V
SW3
2PSUJ
1000U
4
5
6
VR1B
5KRD
R100
75RR975R
R10
100R
H1B
4K7
H1A
4K7
C8
33P
5
6
7
IC2B
TL072
+48V
+48V
INPUT B
SW1
SW DPDT
R11
470
SW2
SW 6PDT
R5
10k
C1
47/63
D1
12V
D2
12V
+IN
-IN
INPUT B
RIAA
LEFT
JR1
JR2
C7
2.2/63
R101
6K8
R102
6K8
R2
6K8
R1
6K8
R4
16K2R316K2
XL2
XL3
-IN
+IN
RIAA
INPUT B
RIGHT
R103
16K2
R104
16K2
JR3
JR4
R12
10
XL2
XL3
D3
12V
D4
12V
R7
2K2
R6
10K
C2
47/63
R8
24K
C3
220P
L+R-3dB
3
2
6
5
1
8
7
4
IC1
SSM2017
R118
10R
C6
100U
16V
H1C
4K7
R15
3K3
C10
33P
3
2
1
8
4
IC12A
TL072
H1D
4K7
H101A
4K7
R115
3K3
R CUT
R14
10K
C11
75
C11
100U
16V
R17
10K
SW5
2PSUJ
+
-
R24
47K
R25
47K
5
6
7
IC3B
TL074
4
5
6
VR4B
10KB
R28
220K
3
2
1
4
11IC3A
TL074
R29
10K
+
-
C17
10N
4
5
6
VR3B
100KC
10
9
8
IC3C
TL074
R30
6K8
3
2
1
4
1
1
IC4A
TL074
4
5
6
VR6B
10KB
R34
220K
R35
10K
C19
68N
4
5
6
VR5B
100KC
R36
6K8
10
9
8
IC4C
TL074
5
6
7
IC4B
TL074
EQ
R4275C24
100u
R43
10K
SW6
SW DPDT
C23
33P
R143
10K
C124
100u
R142
75
R141
47K
C122
33P
R139
1K2
C123
33P
10
9
8
IC15C
TL074
R140
47K
C121
470N
4 5
6
VR7B
10KB
C120
470N
R138
1K2
R132
10K
R133
10K
12
13
14
IC15D
TL074
C119
68N
10
9
8
IC15C
TL074
1
2
3
VR5A 100KC
R137
470
C118
47N
-
90Hz to 1.3kHz
R135
10K
3
2
1
4
1
1
IC15A
TL074
1
2
3
VR6A
10KB
R127
10K
R126
10K
12
13
14
IC14D
TL074
C117
10N
10
9
8
IC14C
TL074
R131
470
1
2
3
VR3A 100KC
C116
6N8
600Hz TO 8.8kHz
-
R129
10K
3
2
1
4
1
1
IC14A
TL074
1
2
3
VR4A
10KB
R123
1K5
4 5
6
VR2B
10KB
R122
1K5
C115
33P
C114
3N3R124
47K
R125
47K
5
6
7
IC14B
TL074
R116
75
C111
100U
16V
R117
10K
H101D
4K7
C108
33P
3
2
1
8
4
IC12A
TL072
H101C
4K7
SW4
SW DPDT
C110
33P
5
6
7
IC12B
TL072
H101B
4K7
3
2
1
8
4
IC13A
TL072
C12
33P
R19
4K7
R18
4K7
C106
100U
16V
C105
1000U
1
2
3
VR1A
5KRD
R110
100R
3
2
6
5
1
8
7
4
IC11
SSM2017
R109
7R5
D102
12V
D101
12V
R105
10K
R107
2K2
C101
47/63
R111
18
XLR1
C51
10N
C103
220P
R108
24K
D104
12V
D103
12V
R106
10K
C102
47/63
R20
75
1
2
3
A
R49
220K
R50
680K
C29
220N
5
6
7
IC6B
NE5532
0 REV
R113
75R
R21
10K
C13
100U
16V
R53
75
C31
220U
16V
LM
+
BALANCE
+3dB,-6dB
R114
10K
C109
100U
16V
R128
220K
1
2
3
VR12A
10KB
R60
5
6
7
IC8B
NE5532
+
R134
220K
R130
6K8
1% RESISTOR
R136
6K8
SW11
SW DPDT
R
METER_R_INPUT
METER_L_INPUT
CN6-15
CN6-13
CN6-11
CN6-9
CN6-7
CN6-5
1-2
3-4
5-6
R165
10K
R65
10K
R66
10K
R166
10K
R67
10K
R167
10K
SW12
SW DPDT
SW13
SW DPDT
R63
75
C36
220U
16V
R64
10K
R163
75
C136
220U
16V
R164
10K
R58
10K
R59
3K3
R158
10K
4
5
6
VR12B
10KB
R159
3K3
R160
C35
33P
R62
3K3
R61
8K2
3
2
1
8
4
IC8A
NE5532
C135
33P
R52
10K
H3A
4K7
H3B
4K7
R54
3K3
C32
33P
3
2
1
8
4
IC7A
TL072
H3C
4K7
JR12
JR11
R51
4K7
C30
33P
ON
SW15
SW 4PDT
JR9
JR10
PRE FADE MONO
L+R-3dB
H2A
4K7
H2A
4K7
R46
3K3
C25
33P
3
2
1
8
4
IC5A
TL072
CN4-1
CN4-2
CN4-3
CN4-8
CN4-9
CN4-10
CN5-1
CN5-2
CN5-3
CN5-4
JR13
D5
GREEN
1
2
3
A
R149
220K
R150
680K
C129
220N
3
2
1
8
4
IC6A
NE5532
C130
33P
R151
4K7
L+R-3dB
POST FADE MONO
R152
10K
R153
75
C131
220U
16V
RM
LL1LL2
R162
3K3
R161
8K2
H3D
4K7
C33
33P
5
6
7
IC7B
TL072
R55
75
C34
100U
16V
D8
RED
SW16
SW DPDT
J2
R56
10K
PFL
PFL
CN6-3
CN6-1
7-8
CN6-19
CN6-17
MIX
R68
10K
R168
10K
R69
10K
R169
10K
SW14
SW DPDT
SW10
SW DPDT
LL2
R85
100K
R84
100K
R83
100K
Q2
BC550
D12
GREEN
D13
GREENQ3
BC550
Q4
BC550
D14
GREEN
+17V
D11
18U
D10
1N4148
R79
10K
D9
1N4148
6x100K H4
CN6-2
CN6-4
SOLO ENABLE
SOLO AUDIO
METER_R_INPUT
METER_L_INPUT
C37
100u
R78
10K
5
6
7
IC9B
TL072
R70
10K
R71
47K
SW7
SW DPDT
SW8
SW DPDT
J3
J4
VR9
20A
VR8
20KA
PRE
LM
RM
H2D
4K7
C26
33PH2C
4K7
5
6
7
IC5B
TL072
R47
75
C27
100U
16V
R48
10K
LL1
CN6-26
EARTH SENSING RESISTOR
AUX EARTH
R88
10K
-17V
+17V
+17V
R44
62
Q1
BC560
R94
10R
R96
10R
R98
10R
1N4148
1N4148
CN4-4
+17V
-17V
CN4-6
CN4-7
CN4-5
CN6-32
CN6-30
CN6-28
R45
30K
R90
10R
R92
10R
CN6-16
CN6-14
CN6-12
CN6-10
CN6-8
CN6-6
CN6-24
CN6-22
CN6-20
C41
220U
25V
C42
220U
25V
R91
10R
R93
10R
C43
22U
25V
C44
22U
25V
+V1 +V2 +V3 +V4
-V1 -V2 -V3 -V 4
-17V
R95
10R
R97
10R
R99
10R
C45
22U
25V
C47
22U
25V
C49
22U
25V
C46
22U
25V
C48
22U
25V
C50
22U
25V
C4
22U
25V
C104
22U
25V
CN6-18
BALANCE POT
EARTH SENSING RESISTOR
MAIN GROUND SPADE
CN7
CN2-34
CN2-33
+48V
R89
10K
NOTE METER NOT SHOWN
SEE PRO INPUT SCHEMATIC
J1
VR10
20KA
VR11
20KA
SW9
SW 4PDT
PRE
5-6
CN6-27
CN6-25
CN6-23
CN6-21
CN6-29
CN6-31
AUX1
AUX2
AUX3
AUX4
AUX5
AUX6
R178
10K
C137
100u
3
2
1
8
4
IC9A
TL072
R72
10K
R73
10K
R77 10K
R76 10K
R75 10K
R74 10K
D109
1N4148
R179
10K
D110
1N4148
R80
91K
C40
1U0
R81
18K
R57
18K
R82
47K C38
2U2
1 2 3 4 6 9
57
8
IC10
BA6144
-17V -1 7V
-17V -17V
C39
C22U
R87
100K
R86
100K
Q5
BC550
Q6
BC550
D16
RED
D15
GREEN
-17V -17V
-17V
Date: January 16, 1995 Sheet 1 of 1
Size Document Number REV
B CD1260-1 A
Title
FORUM STEREO MUTE SUB (PC1377-B)
TEL: (0)81-570-7161 FAX: (0)81-577-3677
DDA, HOUNSLOW, MIDDX, TW3 2EB, ENGLAND.
SW9
2PSUJ
LED9
RED
LED9
LED1
RED
SW1
2PSUJ
MUTE1
D1
D2
LED2
RED
SW2
2PSUJ
MIDI MUTE
VSS
R5
100K
LEDIN
VDDVDD
R7
100K
TR1
BC212
TR2
BC182
R9
100K
CUT
R6
47K
8
9
10
IC3C
CD4001
5
6
4
IC3B
CD4001
VSS 1
2
3
IC3A
CD4001
R3
22K
1
2
3
CON8
3WAYMH
VSS
VDD
R2
1K
C1
47N
C6
100P
D3
LED3
RED
SW3
2PSUJ
MUTE2
MUTE3
MUTE4
D4
LED4
RED
SW4
2PSUJ
VDD
VSS
R1
100K
C3
22U
25V
CN4/2
R10
100K
R4
47K
D9 TR5
J111
D12
C2
470N
V-
R8
100K
LEDOUT
V+
SERIES
V+
14
AI
4
AO
6
AC
2
BI
11
BO
9
BC
13
V-
7
0V
1
0V
3
0V
5
0V
12
0V
10
0V
8
IC1
SSM2402
V+
12
13
11
IC3D
CD4001
CN4/3
CN4/2
1
2
3
4
5
6
7
8
9
10
CON1
10WAY
MHL
CN4/3
CN4/7
CN4/6
CN4/5
CN4/8
CN4/9
LEDIN
LEDOUT
CN4/2
VSS
R16
100K
VSS
VDD
CN4/3
TR4
BC212
R14
1K
R15
10K
D5
LED5
RED
SW5
2PSUJ
MUTE5
MUTE6
D6
LED6
RED
SW6
2PSUJ
MUTE1
MUTE3
MUTE5
VSS
1 2
3 4
5 6
7 8
9 10
CON3
10WAY
IDCMH
MUTE2
MUTE4
MUTE6 RIGHT
LEFT
V-V-
C7
220P
V-
CN4/4
CN4/1
1
2
3
CON2
3WAY
MH
SCREEN
SCREEN
CN5/4
CN5/1
AUDIO IN
AUDIO OUT
AUDIO IN
AUDIO OUT
V-
V+
SHUNT
V+
14
AI
4
AO
6
AC
2
BI
11
BO
9
BC
13
V-
7
0V
1
0V
3
0V
5
0V
12
0V
10
0V
8
IC2
SSM2402
V-
V+
R11
75R
V+
D10
D11
MUTE8MUTE7
D7
LED7
RED
LED8
RED
SW7
2PSUJ
MUTE7
MUTE8
D8
SW8
2PSUJ
V-
V+
R13
180R
C4
2U2
63V
C5
2U2
63V
VIN
1
0
V
2
VOUT
3
IC4
78L05
VSS
VDD
V-
R12
33K
LED9
TR3
BC212
Date: May 1 0, 1993 Sheet of
Size Document Number REV
D CD1210-1 A
Title
FORUM STD OUTPUT
TEL:(0)81-570-7161 FAX(0)81-577-3677
DDA LTD., HOUNSLOW, MIDDX., TW3 2EB, ENGLAND
ON
TO PFL LED
D2
GRN
SW2
VCC
R23
4K7
R15
10K
R16
10K
C9
33P
3
2
1
8
4
IC2A
TL072
R17
75R
C10
100/16
H.F.
R10
1K5
VR1
10KB R11
1K5
C5
33P
5
6
7
1C1B
TL072
C2
33P
R3
5K6
R8
5K6
R6
2K
R7
75RC3100/16
IN -
RETURN A
RING
R1
22K
IN +
TIP
GROUND
SLEEVE
CHASSIS EARTH
C1
33P
R4
5K6
R5
5K6
R2
22K
C41
10N
R84
22R
LINK FOR
-10dBV
LK25
0
R9
10K
C6
3N3
C4
33P
3
2
1
8
4
IC1A
TL072
R14
22K
C7
68N
R12
2K2 VR2
10KA
R13
2K2
C8
68N
V-
FROM ON LED
C11
220N
R28
47K
R29
10K
D1
RED
SW1
VR4
10KA
V+
V-
PFL ENABLE
5
6
7
IC2B
NE5532
C12
33P
R19
4K7
R20
10K
C13
100/16R18
680K
R22
10K
R21
75R
4
5
6
VR5B
10KB
1
2
3
VR5A
10KB
R26
3K
R24
3K
MIX L
MIX R
R25
6K2
R27
6K2
MIX L
R55
10K
R57
6K2
SUB L
1
2
3
VR10A
10KB
SW7
R56
3K
AUX 1
PFL AUDIO
R30
10K
SEND
TIP
INSERT
FROM ON LED
AUX 1
VR3
20KA
R75
75R
R76
10K
C33
100
PFL
C30
33P
R72
10K
R73
10K
3
2
8 567
4
IC5
NE5534
C31
15P
R74
10K
C32
33P
3
2
1
8
4
IC6A
NE5532
L.F.
GROUP BUS 1
GROUP BUS 2
MIX EARTH REF
LK1
LK2
R134
2K4
R70
75R
V+
V+
V+
SUB GROUP V+
RETURN A V+
RETURN B V+
C44
22/25
C46
22/25
+17V
+17V
+17V
0V
0V
R89
10R
R87
10R
R85
10R
C42
22/25
0V
-17V
0V
0V
0V
-17V
-17V
C43
22/25
R86
10R
R88
10R
R90
10R
V-
V-
V-
RETURN B V-
RETURN A V-
SUB GROUP V-
EARTH TERMINAL
C47
22/25
C45
22/25
R35
5K6
R36
5K6
GROUP BUS 3
GROUP BUS 4
GROUP BUS 5
GROUP BUS 6
GROUP BUS 7
GROUP BUS 8
R73
100KLK3
LK4
LK5
LK6
LK7
LK8
AUX 1
SW4
D3
YEL
AUX 1
V-
PFL ENABLE
PFL AUDIO
R62
47K
R63
10K
R64
10K
VR8
20KA
SUB R
4
5
6
VR10B
10KB
SW8
R58
3K
MIX R
R60
10K
R59
6K2
GROUP 1
LK11
ON
TO PFL LED
P.A.
RECORD
D4
GRN
SW5
SW6
V+
V-
VCC
R49
680K
5
6
7
IC4B
NE5532
C25
33P
R52
10K
R50
4K7
R53
10K
C26
100/16
R51
75R
R46
10K
C22
33P
3
2
1
8
4
IC4A
TL072
R47
75R
C23
100/16
C24
220N
VR9
20KA
H.F.
VR6
10KB R41
1K5
C18
33P
C17
3N3
C19
33P
3
2
1
8
4
IC3A
TL072
R44
22K
R45
10K
RETURN/TAPE
BUS
R40
1K5
SW3
LINK FOR
-10dBV
5
6
7
IC3B
TL072
C15
33P
R37
2K
R38
75R
C16
100/16
LK24
0
R39
10K
IN -
IN +
RETURN B
GROUND
SLEEVE
TIP
RING
R31
22K
R32
22K
C14
33P
R34
5K6
R33
5K6
RETURN
RING
TIP NORM
SLEEVE
10K+
INSERT
FADER C34
220N
R77
680K
5
6
7
IC6B
TL072
R78
10K
R69
75R
C35
100/16
R42
2K2
L.F.
C20
68N
C21
68N
R43
2K2VR7
10KB
R61
10K
GROUP 2
GROUP 3
GROUP 4
GROUP 5
GROUP 6
GROUP 7
LK12
LK13
LK14
LK15
LK16
LK17
LK18
V+
V-
3 4
SIL2B
10K
1 2
SIL2A
10K
XLR3
GROUP 8
7 8
SIL2D
10K
3
2
1
8
4
IC7A
NE5532
C40
100/16
R83
4K7
GROUP
OUTPUT
C37
33P
R81
75R
-10dBV
LK24LKR79
2K
R80
910R
C36
100/16
1 2
SIL1A
4K7
REMOVE FOR
+17V
D28
1N4148
D29
1N4148
Q1
BC560
Q2
BC560
R132
62R
R133
62R
+17V +17V
D8
GRN
D9
GRN
R131
30K
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC10
LM2901
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC9
LM2901
D10
GRN
D11
GRN
D12
GRN
D13
GRN
D14
GRN
D15
GRN
D16
GRN
VCC
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC11
LM2901
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC12
LM2901
D17
GRN
D18
GRN
D19
YEL
D20
YEL
D21
YEL
D22
YEL
-17V
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC13
LM2901
D23
YEL
D24
RED
D25
RED
D26
RED
D27
RED
J15
PEAK
J15
AV
12
1314IC18D
TL074
R101
1K0
10
9
8
IC18C
TL074
R100
10K
R98
27K
R96
100K
5
6
7
IC18B
TL074
R95
10K
R94
20K
R93
20K
D6
1N4148
D5
1N4148
3
2
1
4
1
1
IC18A
TL074
R92
20K
R65
22K
1
2
3
R91
22K
VCCVCC
R66
220
R67
470K
1 2
3
R68
100K
R102
270K
D7
IN4148
R99
47K
R97
1K1
C51
2U2
C50
22U
+17V
R130 18K
R129
4K7
R128
3K3
R127
2K4
R126
1K6
R125
820
R124
680
R123
270
R122
220
R121
220
R120
200
R119
330
R11827R117
270
R116
220
R115
150
R114
100
R113
68
-17V
R11256R111
36
R110
91
7 8
SIL1D
4K7
3
4
SIL1B
4K7
5
6
SIL1C
4K7
LAST R
LAST C
R82
C35
NOTES
+V4
-V4
-17V
+17V
R104
10
C52
47
C53
47
R105
10
V+
V-
5 6
SIL2C
10K
XLR2
XLR1
5
6
7
IC7B
NE5532
C40
100/16
R82
75R
C38
33P
Date: June 3, 1993 Sheet 1 of
Size Document Number REV
D CD1172-3 A
Title
FORUM MATRIX OUTPUT MODULE (PC1297-3)
DDA, HOUNSLOW, MIDDX, TW3 2EB, ENGLAND.
TO TRANSFORMER
OPTION
GROUP OUTPUT
To XLR
1 2
3 4
5 6
7 8
9 10
11 12
CN5
12WAY
0.3"
1 2
LK6
1 2
LK5
1
2
3
CN4
3WAYWIR
C9
100U
16V
C10
100U
16V
C11
100U
16V
8
6
4
3
7
215
IC5
SSM2142
V4+
V4-
CN1-19
SUB R13
10K
SW2
2PSUJ
MIXL
R10
4K7
R11
75RC8100U
16V
5
6
7
IC2B
NE5532
R9
680K
C6
220N
C7
33P
R12
7K5
Fader
Input
R7
10K
LED1
RED
LL5
LL4
1 23
CN3
3WAYPIN
INSERT
C2
22P
C3
33P
R4
10K
R6
75RC5100U
16V
R5
10K
3
2
1
8
4
IC2A
NE5532
C4
33P
V3-
V3+
CN1-9
CN1-11
CN1-13
CN1-15
CN1-18
GROUP
CN1-1
CN1-7
CN1-5
CN1-3 R2
100K
3
2
8 567
4
IC1
NE5534
R3
10K
C1
100N
R1
75R
L1
0H
1 2
3
5
7
9
11
13
15
4
6
8
10
12
14
16
LK1
GROUP1
GROUP2
GROUP3
GROUP4
GROUP5
GROUP6
GROUP7
GROUP8
MIXEARTH
V2+
V2-
2
1
3
4
5
J1
1/4JACK
SW1
6PSUJ
Group
R8
220K
CN1-17
SUB
GROUP SOLO
CN1-16
R14
10K
R15
10K
SW3
2PSUJ
SW4 2PSUJ
LED2
YEL
MIXR
LL2
LL1
MIXEARTH
R18
10K
1
2
3
VR1
20KA
1
2
3
VR2
20KA
1
2
3
VR3
20KA
CN2-1
CN2-2
CN2-3
R19
10K
R20
10K
R21
10K
1
2
3
VR4
20KA
MATRIX1
MATRIX2
MATRIX3
R98
62R
R99
62R
V5+ V5+ V5+
D4
1N4148
CN2-4
MATRIX SENDS
CN2-5
CN2-6
CN2-7
R23
10K
R24
10K
MATRIX4
MATRIX5
MATRIX6
MATRIX7
R22
10K
1
2
3
VR5
20KA
1
2
3
VR6
20KA
1
2
3
VR7
20KA
CN1-4
CN1-2
MATRIX SOLO
R16
47K
R17
10K
R40
47K
LED3
YEL
SW5 2PSUJ
SOLOENABLE
SOLOAUDIO
LL2
LL3
Level
R33
10K
1
2
3
VR9
20KA
C16
100U
16V
3
2
1
8
4
IC4A
NE5532
C13
22P
C15
33P
R31
10K
R32
75R
R30
10K
C14
33P
V3-
V3+
CN2-1
CN2-2
CN2-3
CN2-4
MATRIX
CN2-5
CN2-6
CN2-7
CN2-8
CN2-9
R27
75R
R28
100K
C12
100N
R29
20K
3
2
8 567
4
IC3
NE5534
L2
0H
1 2
3
5
7
9
11
13
15
4
6
8
10
12
14
16
LK2
MATRIX1
MATRIX2
MATRIX3
MATRIX4
MATRIX5
MATRIX6
MATRIX7
MATRIX8
MTXEARTH
V2+
V2-
12 3
CN9
3WAYMH
1 2
LK11
3
2
1
8
4
IC7A
TL072
R43
22K
R49
2K
R47
5K6
C38
33P
V1-
R34
220K
R48
5K6
Matrix
R36
4K7
R37
75R
R39
10K
C19
100U
16V
C18
33P
C17
220N
R35
680K
5
6
7
IC4B
NE5532
R38
7K5
R41
10K
CN2-8
CN2-9
CN2-10
R77
18K
R25
10K
R26
10K
1
2
3
VR8
20KA
MATRIX8
MTXEARTH
MTXEARTH
V5+
R100
30K
TR2
BC212
TR1
BC212
1 2
3
5
7
9
11
13
15
17
21
19
23
25
27
29
31
33
35
37
39
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
LED6
BARGRAPH
+
5
-
4
O
2
+
7
-
6
O
1
+
9
-
8
O
14
+
11
-
10
O
13
+
V
3
V
1
2
IC9
LM2901
LL1
V5+ V5-
V5-
D5
1N4148
+
5
-
4
O
2
+
7
-
6
O
1
+
9
-
8
O
14
+
11
-
10
O
13
+
V
3
V
1
2
IC10
LM2901
V5+
V5-
TO TRANSFORMER
OPTION
R78
4K7
R79
3K3
R80
2K4
R81
1K6
R82
820R
R83
680R
1 2
3 4
5 6
7 8
9 10
11 12
CN7
12WAY
0.3"
C21
100U
16V
1 2
LK7
MATRIX ON
LED4
GRN
SW6
2PSUJ
LL3
LL4
Group
PR1
5K
1/4V
R113
10K
R112
22K
3
2
1
8
4
IC14A
TL072
V5-
V5+
External
Left
R51
10K
1
2
3
VR11
20KA
R50
75R
R57
5K6
C39
100U
16V
LINK FOR
-10dBV
C37
33P
R44
22K
R45
5K6
R46
5K6
R56
5K6
LK3V1+
EXTERNAL INPUT
1 2 3
CN10
3WAYMH
2
1
3
4
5
J2
1/4JACK
1 2
LK12
LINK FOR
-10dBV
C41
33P
R54
5K6
R55
5K6
R58
2K
5
6
7
IC7B
TL072
R52
22K
C40
33P
R53
22K
LK4
External
Right
R60
10K
1
2
3
VR12
20KA
R59
75R
C42
100U
16V
EXT METER
Matrix
C23
100U
16V
5
6
7
IC14B
TL072
PR2
5K
1/4V
R114
22K
R115
10K
12 3
CN11
3WAYMHR/A
R116
3K6
R42
10K
C20
100U
16V
MATRIX OUTPUT
C22
100U
16V
8
6
4
3
7
215
IC6
SSM2142
1 2
LK8
V4+
V4-
To XLR
R84
270R
R85
220R
R86
200R
R87
330R
R88
270R
1
2
3
CN6
3WAY WIR
+
5
-
4
O
2
+
7
-
6
O
1
+
9
-
8
O
14
+
11
-
10
O
13
+
V
3
V
1
2
IC11
LM2901
V5+
V5-
V5-
+
5
-
4
O
2
+
7
-
6
O
1
+
9
-
8
O
14
+
11
-
10
O
13
+
V
3
V
1
2
IC12
LM2901
+
5
-
4
O
2
+
7
-
6
O
1
+
9
-
8
O
14
+
11
-
10
O
13
+
V
3
V
1
2
IC13
LM2901
V5+
V5+
V5-
PEAK
R89
270R
R90
270R
R91
220R
R92
150R
R93
100R
12
13
14
IC8D
TL074
1 2
LK9
R71
27K
R72
47K
R73
1K
R74
270K
R75
10K
C25
2U2
63V
10
9
8
IC8C
TL074
D3
1N4148
5
6
7
IC8B
TL074
3
2
1
4
1
1
IC8A
TL074
R64
20K
R65
20K
R66
10K
R68
470K
R69
390R
R70
1K1
C24
22U
25V
PR3
100K
1/4
R67
33K
V5-
V5+
D2
1N4148
D1
1N4148
METER GROUP
METER MATRIX
R63
20K
LED5
RED
SW7
2PSUJ
R117
3K6
LL5
LL6
IC8,9,10,11,12,13,14
IC5,6
IC2,4
IC1,3
IC7
C30
22U
25V
C31
22U
25V
C32
22U
25V
C33
22U
25V
C34
22U
25V
C35
22U
25V
1
2 CN8
1/4"RPB
V1+
V2+
V3+
V4+
V5+
CN1-28
CN1-30
CN1-32
CN1-6
CN1-8
CN1-10
CN1-12
CN1-14
CN1-16
CN1-20
C26
22U
25V
C27
22U
25V
C28
22U
25V
C29
22U
25V
R102
10R
R109 10R
R107 10R
R105 10R
R103
10R
R101
10R
+17V
+17V
+17V
0V
0V
0V
0V
0V
0V
-17V
CN1-22
CN1-24
CN1-34
R111
22R
C36
10N
R104 10R
R106 10R
R108 10R
R110 10R
-17V
-17V
MWKEARTH
IC8,9,10,11,12,13,14
IC5,6
IC2,4
IC1,3
IC7
V1-
V2-
V3-
V4-
V5-
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
CN1
34WAY
IDCMH
GROUP8
GROUP7
GROUP6
GROUP5
GROUP4
GROUP3
GROUP2
GROUP1
MIXL
MIXR
R76
0R
1 2
3 4
5 6
7 8
9 10
CN2
10WAY
IDCMH
SOLOENABLE
SOLOAUDIO
0V
0V
0V
0V
0V
0V
-17V
-17V
-17V
+17V
+17V
+17V
MWKEARTH
MIXEARTH
MATRIX1 MATRIX2
MATRIX3 MATRIX4
MATRIX5 MATRIX6
MATRIX7 MATRIX8
MTXEARTHMTXEARTH
Offset
V5-
V5+
LAST R
LAST C
LAST IC
LAST D
LAST LED
R117
C42
IC14
LAST SW
D5
LED6
SW7
LAST VR VR11
LAST LK LK12
LAST CN CN11
VU
R94
68R
R95
56R
R96
36R
R97
91R
LK10
LL6
V5-
Date: June 2, 1993 Sheet 1 of 1
Size Document Number REV
D CD1175-2 A
Title
FORUM 24 TRACK MONITOR (PC1301-1)
DDA, HOUNSLOW, MIDDX, TW3 2EB, ENGLAND.
TO TRANSFORMER
OPTION
GROUP OUTPUT
To XLR
1 2
3 4
5 6
7 8
9 10
11 12
CN6
12WAY
0.3"
1 2
LK2
1 2
LK3
1
2
3
CN7
3WAY
WIR
CN1-19
R13
10K
C9
100U
16V
C10
100U
16V
C11
100U
16V
8
6
4
3
7
215
IC3
SSM2142
MIXL
V4+
V4-
SUB LEFT
R11
75RC8100U
16V
SW1
2PSUJ
C7
33P
R16
10K
R12
7K5
Fader
Input
R7
10K
R8
220K
R10
4K7
R9
680K
C6
220N
3
2
1
8
4
IC2A
NE5532
V2+
V2-
1 2 3
CN9
3WAYPIN
R4
10K
R6
75RC5100U
16V
R5
10K
C4
33P
5
6
7
IC2B
NE5532
C2
22P
C3
33P
CN1-9
CN1-11
CN1-13
CN1-15
CN1-18
GROUP
CN1-1
CN1-7
CN1-5
CN1-3 R2
100K
R3
10K
C1
100N
R1
75R
3
2
8 567
4
IC1
NE5534
L1
0H
GROUP1
GROUP2
GROUP3
GROUP4
GROUP5
GROUP6
GROUP7
GROUP8
MIXEARTH
V1+
V1-
1 2
3
5
7
9
11
13
15
4
6
8
10
12
14
16
LK1
16WAY
IDCVM
1 2 3
CN3
3WAYMH
INSERT
2
1
3
4
5
J1
1/4JACK
R19
5K6
R20
5K6
TAPE ON R130
10K
LED1 RED
Group
HF
SUB RIGHT
R29
1K6 C17
33P
1 2
3
VR1
10KB
SW12
2PSUJ
CN1-16
CN1-17
1
2
3
VR3
20KA
R14
10K
R15
10K
R30
1K6
C20
100U
16V
C21
220N
MIXEARTH
MIXR
3
2
6
7
4
IC7
TL071
R36
680K
R39
75R
R40
10K
C23
100U
16V
SW3
2PSUJ
LED2 GRN
LL5
LL6
V2+
V2-
PAN
R43
10K
1
2
3
7
VR4A
10KB
X2CD
R46
4K7
CN1-19
R45
3K3
R49
100K
R51
10K
C25
100U
16V
5
6
7
IC10B
TL072
C24
33P
MIXL
CN1-17
CN1-31
R50
100K
R52
10K
R112
10K
C27
100U
16V
R47
3K3
3
2
1
8
4
IC10A
TL072
C26
33P
AUX1
MIXR
V2+
V2-
AUX1
PRE
4
5
6
VR4B
10KB
X2CD
1
2
3VR5
20KA
R44
10K
R48
4K7
SW9
2PSUJ
ON
R37
4K7
R38
10K
R41
47K
C22
33P
SW4
2PSUJ
LED3 YEL
SOLOENABLE
LL6 LL7
LEVEL
R32
1K6
R34
75R
R35
10K
LF
R31
1K6
C16
2N2
R33
22K
C57
33P
1 2
3
VR2
10KB
C19
470N
0.2
C18
33P
3
2
1
8
4
IC13A
TL072
V2-
V2+R25
10K
R26
10K
C15
100U
16V
5
6
7
IC13B
TL072
R129
10K
PR1
5K
1/4
SW2
2PSUJ
LL7
V3-
LINK FOR
-10dBV
3
2
1
8
4
IC4A
TL072
R21
5K6
R22
5K6
R23
2K
R24
75R
R27
22K
C12
33P
C13
33P
C14
100U
16V
LK4
V3-
V3+
TAPE 1
2
1
3
4
5
J2
1/4JACK
R17
22K
R18
22K
R53
22K
R54
22K
12 3
CN4
3WAYMH
2
1
3
4
5
J3
1/4JACK
3
2
1
8
4
IC5A
TL072
R28
33R
R55
5K6
R56
5K6
R59
2K
R60
75R
C28
33P
C30
100U
16V
LK5
VU1
V3-
V3+
5
6
7
IC4B
TL072
1
2
3
VR7
20KA
C31
220N
CN1-4
CN1-2
SOLO
3
2
6
7
4
IC8
TL071
R42
10K
R65
680K
R68
75R
C33
100U
16V
SW5
2PSUJ
LED4 GRN
1 2
LK8
1 2
LK7
SOLOAUDIO
LL3
LL4
V2+
AUX2
PAN
1
2
3
VR6
20KA
R72
10K
1
2
3
7
VR8A
10KB
X2CD
CN1-19
CN1-29
R75
3K3
R79
10K
R80
100K
R113
10K
C35
100U
16V
5
6
7
IC11B
TL072
C34
33P
AUX2
MIXL
CN1-17
R77
3K3
R81
10K
R82
100K
R114
10K
C37
100U
16V
3
2
1
8
4
IC11A
TL072
C36
33P
AUX1
MIXR
V2+
V2-
PRE
1
2
3
VR9
20KA
4
5
6
VR8B
10KB
X2CD
R73
10K
R74
4K7
R76
4K7
SW10
2PSUJ
TAPE 2 ON
R66
10K
R67
4K7
R69
10K
C32
33P
SW6
2PSUJ
LED5 YEL
LL4 LL5
V2-
LEVEL
R64
10K
5
6
7
IC5B
TL072
R63
33R
R62
22K
R61
10K
PR2
5K
1/4
LINK FOR
-10dBVR57
5K6
R58
5K6
C29
33P
VU2
TAPE 2
R83
22K
R84
22K
12 3
CN5
3WAYMH
2
1
3
4
5
J4
1/4JACK
LINK FOR
-10dBV
3
2
1
8
4
IC6A
TL072
R85
5K6
R86
5K6
R87
5K6
R88
5K6
R89
2K
R90
75R
C38
33P
C39
33P
C40
100U
16V
LK6
V3-
V3+
5
6
7
IC6B
TL072
R91
10K
R92
22K
PR3
5K
1/4
C41
220N
CN1-4
CN1-2
SOLO
3
2
6
7
4
IC9
TL071
R70
47K
R71
10K
SW7
2PSUJ
LED6 GRN
1 2
LK10
1 2
LK9
SOLOENABLE
SOLOAUDIO
LL1
LL2
V2+
AUX1
AUX2
1
2
3VR10
20KA
R102
10K
1
2
3
7
VR12A
10KB
X2CD
CN1-19
CN1-31
CN1-29
R108
10K
R109
100K
R115
10K
C44
100U
16V
5
6
7
IC12B
TL072
C43
33P
AUX2
MIXL
CN1-17
R110
10K
R111
100K
C46
100U
16V
3
2
1
8
4
IC12A
TL072
C45
33P
R105
3K3
R107
3K3
MIXR
V2+
V2-
PAN
PRE
4
5
6
VR12B
10KB
X2CD
R103
10K
R104
4K7
R106
4K7
SW11
2PSUJ
TAPE 3 ON
R95
680K
R96
4K7
R97
10K
R98
75R
R99
10K
C42
100U
16V
C56
33P
LED7 YEL
LL2 LL3
V2-
LEVEL
1
2
3
VR11
20KA
R94
10K
TR1
BC212
R118
62R
LL1
V3+ V3+
V3-
D1
1N4148
D2
1N4148
R119
30K
R93
33R
IC1
IC2,7,8,9,10,11,12,13
LED CHAIN,IC4,5,6
IC3
VU3
V1+
V2+
V3+
V4+
CN1-28
CN1-30
CN1-32
TAPE 3
R120
10R
R122
10R
R124 10R
R126 100R
+17V
+17V
+17V
CN1-6
CN1-8
CN1-10
CN1-12
CN1-14
CN1-16
CN1-20
CN1-22
CN1-24
R121
10R
R123 10R
R125 10R
C47
22U
25V
C48
22U
25V
C49
22U
25V
C50
22U
25V
R127 100R
0V
0V
0V
0V
0V
0V
-17V
-17V
-17V
IC3
IC2,7,8,9,10,11,12,13
LED CHAIN,IC4,5,6
IC1
C51
22U
25V
C52
22U
25V
C53
22U
25V
C54
22U
25V
1
2 CN8
1/4RPB
V1-
V2-
V3-
V4-
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
CN1
34WAY
IDCMH
SOLOENABLE
SOLOAUDIO
0V
0V
0V
0V
0V
0V
-17V
-17V
-17V
+17V
+17V
+17V
MWKEARTH
GROUP8
GROUP7
GROUP6
GROUP5
GROUP4
GROUP3
GROUP2
GROUP1
MIXEARTHMIXR
MIXL
AUX1
AUX2 CN1-34
EXT METER
MWKEARTH
VU1
VU2
VU3
12 34
CN2
4WAYMHR/A
R128
22R
C55
10N
CN1-4
CN1-2
LAST LK LK12
LAST SW
LAST LED
LAST VR
LAST R
LAST C
LAST IC
SW12
LED7
VR14
IC13
R130
C57
CN9LAST CN
LAST J J4
D2LAS T D
SOLO
R100
47K
R101
10K
SW8 2PSUJ
1 2
LK11
1 2
LK12
SOLOENABLE
SOLOAUDIO
AUX1
AUX2
1
2
3VR13
20KA
1
2
3
VR14
20KA
CN1-31
CN1-29
R116
10K
R117
10K
AUX1
AUX2
Date: May 10, 1993 Sheet 1 of 2
Size Document Number REV
D CD1211-1 A
Title
FORUM MASTER
TEL:(0)81-570-7161 FAX:(0)81-577-3677
DDA, HOUNSLOW, MIDDX, TW3 2EB, ENGLAND.
OUT+
3
2
1
8
4
IC13A
NE5532
R121
75
C72
100/16
OUT+
OUT-
LEFT
MONITOR
R93
10K
R94
75
R92
75
R91
10KR90
10K
5
6
7
IC13B
NE5532
R89
10K
C56
100/16
C54
33P
C53
33P
XLR3
LEFT
LK3
R88
10K
R87
10K
R17
10K
RL1
R18
10K
C52
100/16
V+
V-
3 4
SIL2B
10K
1 2
SIL2A
10K
7 8
SIL2D
10K
1 2
SIL1A
4K7
C9
33
C11
100/16
R14
75
3
2
1
8
4
IC3A
NE5532
R16
4K7
OPTIONAL O/P
TRANSFORMER
REMOVE FOR
-10dBV
C7
100/16
C8
100/16
R12
2K
R10
0R
R11
75R
LK1
LK
R13
910R
C5
220N
R8
680K
R9
NOT FITTED
POT?
10K
C6
33P
5
6
7
IC2B
NE5532
SEND RETURN
RING NORMAL
SLEEVE
C4
100/16
R7
10K
R3
10K
R4
10K
R5
10K
R6
75R
C3
33P
C2
22P
C1
33P
3
2
8567
4
IC1
NE5534 3
2
1
8
4
IC2A
NE5532
AUX EARTH REF
AUX BUS 1
R2
100K
MIX
LEFT
R1
75R
L1
0.22UH
PRE
CENTRE
DETENT
SW1
SW DPDT
R42
47K
R43
47K
MONO LEVEL
C32
33P
R46
4K7
R45
1K
C31
220N
R25
10K
C18
33P
C17
22P
5
6
7
IC7B
NE5532
R44
680K
1
2
3
VR1
10KB
REMOVE FOR
-10dBV
C33
100/16
R48
910R
LK9
LK
R48
2K
R41
75R
V+
V-
V+
1 2
SIL5A
4K7
7 8
SIL5D
4K7
1 2
SIL6A
10K
C34
33
3
2
1
8
4
IC8A
NE5532
5
6
7
IC8B
NE5532
XLR3
MONO
7 8
SIL6D
10K
3 4
SIL6B
10K
R49
75
R50
75
C36
100/16
C37
100/16
R51
4K7
RL2
R53
10K
LK10
LK11
OPTIONAL O/P
TRANSFORMER
R52
10K
V+
V-
7 8
SIL1D
4K7
3
4
SIL1B
4K7
5
6
SIL1C
4K7
5 6
SIL2C
10K
C10
33
C12
100/16
V+
V-
R15
75
5
6
7
IC3B
NE5532
-C25
100/16
1 2
SIL3A
4K7
C26
33
1 2
SIL4A
10K
3
2
1
8
4
IC6A
NE5532
R36
75
C28
100/16
R116
10K
XLR2
XLR1
OPTIONAL O/P
TRANSFORMER
LK6
LK4
R117
10K
C68
100/16
OUT-
RIGHT
MONITOR
R118
10K
R119
10K
R120
10K
R122
10K
R123
75
XLR3
C69
33P
C71
33P
R39
10K
RL3
XLR2
XLR1
RIGHT
R40
10K
R37
75
3 4
SIL4B
10K
7 8
SIL4D
10K
C29
100/16
R38
4K7
LK7
V+
V-
7 8
SIL3D
4K7
3
4
SIL3B
4K7
5
6
SIL3C
4K7
5
6
7
IC6B
NE5532
5 6
SIL4C
10K
C27
33
R34
910R
XLR2
XLR1
REMOVE FOR
-10dBV
R32
75R
C23
100/16
LK2
LK
R33
2K
V-
POT?
POT
3
4
SIL5B
4K7
5
6
SIL5C
4K7
5 6
SIL6C
10K
C35
33
C21
220N
5
6
7
IC5B
NE5532
SEND
RETURN
RING NORMAL
SLEEVE
R27
10K
C19
100/16
V+
R26
75R
R24
10K
3
2
8567
4
IC4
NE5534
C16
33P
R23
10K R70
4K7
3
2
1
8
4
IC5A
NE5532
CHASSIS EARTH
AUX EARTH REF
AUX BUS 1
MIX
RIGHT
R22
100K
R21
75R
C74
10N
R124
22R
L2
0.22UH
TAPE-
TAPE+
LEFT
TIP
RING
GROUND
SLEEVE
R75
5K6
C46
33P
5
6
7
IC10B
TL072
R77
2K
LK13
LK
R71
22K
R72
22K
R74
5K6
R73
5K6
TAPE
V-
R80
10K
R109
10K
D1
LED
C47
100/16
R79
10K
R76
5K6
R78
75R
SW2
C49
100/16
R81
10K
C48
33P
3
2
1
8
4
IC11A
TL072
Q2
JFET N
Q1
JFET N
D2
1N4148
R29
680K
R30
NOT FITTED
R84
33K
R83
4K7
C22
33P
SW5
1
2
3
VR2A
10KA
HEADPHONES
R31
0R
R86
10K
C51
100/16
R85
100K
3
2
1
8
4
IC12A
TL072
C50
10P
SW3
C81
33P
5
6
7
IC14B
TL072
R134
4K7
R133
680K
R135
10K
V+
R140
10K
C82
220U
R136
10K
R139
33R
R138
33R
R146
10K
Q9
BC560
Q8
BC550
D6
1N4148
D7
1N4148
V+
HEADPHONE
LEFT
R141
75R
HEADPHONE
RIGHT
R151
75R
R150
10K
C85
220U
VCC
VCCVCC
R228
62R
R227
62R
D19
1N4148
D20
1N4148
V-
V-
R137
10K
Q10
BC550
R148
33R
R149
33R
R147
10K
Q11
BC560
R145
10K
C84
33P
3
2
1
8
4
IC14A
TL072
D8
1N4148
D9
1N4148
R132
680K R144
4K7
R143
680K
C83
220N
R142
680K
C80
220N
R114
100K
5
6
7
IC12B
TL072
C67
100/16
R115
10K
C66
10P
R113
33K
R112
4K7
123
VR4A
10KA
SW6
4
5
6
VR2B
10KA
TO METERS
R110
10K
C64
33P
5
6
7
IC11B
TL072
C65
100/16
R111
33R
R82
33R
Q4
JFET N
Q3
JFET N
D3
1N4148
V-
R69
10K
R68
10K
R108
10K
C62
100/16
R105
5K6
R107
75R
-10DBV
LINK FOR
TAPE-
TAPE+
RIGHT
GROUND
TIP
RING
C45
33P
R104
5K6
3
2
1
84IC10A
TL072
R100
22K
R101
22K
R102
5K6
R106
2K
C61
33P
-10DBV
LINK FOR
MIX EARTH REF
SLEEVE
PFL BUS
C60
33P
R103
5K6
LK14
LK
R60
75R
R61
100K
L3
0.22UH
V+
C41
22P
3
2
8567
4
IC9
NE5534
C40
33P
R62
10K
R63
10K
R64
10K
C42
33P
3
2
1
8
4
IC7A
NE5532
R65
75R
R126
22K
V+
C43
100/16
R66
10K
V-
C58
33P
R96
100K
R95
100K
C57
33P
R130
4K7
C96
47
R188
75R
R184
6K2
R185
9K1
D14
1N4148
R183
820R
R182
8K2
R181
10K
5
6
7
IC16B
TL072
3
2
1
8
4
IC16A
TL072
OSC
LEVEL
D15
1N4148
C94
100N
R187
18K
C95
100N
R186
150R
-17V
+17V R224
4K7
R223
3K3
R222
2K4R225 18K
D40
RED
D39
RED
D38
RED
D37
RED
D36
YEL
R221
1K6
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC22
LM2901
VCC
D35
YEL
D34
YEL
D33
YEL
D32
YEL
R220
820
R219
680
R218
270
D31
GRN
D30
GRN
R215
200
R216
220
R217
220
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC21
LM2901
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC20
LM2901
D29
GRN
D28
GRN
D27
GRN
D26
GRN
D25
GRN
D24
GRN
D23
GRN
R208
68
R209
100
R210
150
R211
220
R212
270
R213
27
R214
330
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC19
LM2901
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC18
LM2901
VCC
D22
GRN
D21
GRN
R206
36
R207
56
Q12
BC560
Q13
BC560
R226
30K
R205
91
J15 J15
12
1314IC17D
TL074
R201
1K0
R200
10K
R198
27K
R195
100K
R194
10K
5
6
7
IC17B
TL074
10
9
8
IC17C
TL074
R179
30K
R180
30K
1
2
3
R190
20K
R189
22K
D16
1N4148
R192
20K
D17
1N4148
R193
20K
R191
20K
3
2
1
4
1
1
IC17A
TL074
R173
30K
R174
30K
R175
30K
R176
30K
R177
30K
R178
30K
4
5
6
VR3B
5KRD
R167
62K
R168
62K
R169
62K
R170
62K
R171
30K
R172
30K
AUX3 AUX4 AUX5 AUX 6 MIX/L MIX/R
V+
R158
10
V+
V-
V-
PFL/AFL
R128
22K
Q6
BC550
R129
47K
D4
LED
R165
62K
R166
62K
AUX1 AUX2
R152
6K8
R153
6K8
C86
47
C78
100P
Q7
BC550
V+
V+
OUTPUT AMPS
OTHER AMPS
V- V-
V-
PFL ENABLE
V+
HEADPHONE AMPS
C75
2.2U
R125
100K
Q5
BC550
C76
10N
R127
47K
+48V
J15
+17V
+17V
R231
10R
R233
10R
R235
47R
0V
-17V
+17V
0V
0V
0V
0V
0V
-17V
-17V
R232
10R
R234
10R
R236
47R
C102
22/25
C103
22/25
C104
22/25
C105
22/25
V-
V-
OUTPUT AMPS
OTHER AMPS
V-
HEADPHONE AMPS
C106
1000U
C107
1000
J15
R196
10 R154
2K2
C87
47
R155
10K
R156
10K
MIC
TALKBACK
XLR2
XLR1
XLR3
D10
12V
D11
12V
D12
12V
D13
12V
V-
R157
24K
C88
220P
C89
22
C90
22
R159
10
C91
220
R160
22
3
2
6
5
1
8
7
4
IC15SSM-2017
C92
100
1
2
3
VR3A
5KRD
R161
5K1
R162
62K
R163
62K
AUX 1-2
TB
GAIN
SW4
+V4
-V4
C100
47
C99
47
R203
10
R204
10
-17V
+17V
VCCVCC
D18
IN4148
R199
47K
R197
1K1
R240
220
R239
470K
1 2
3
R238
100K
C98
2U2
C97
22U
R202
270K
Date: November 16, 1993 Sheet 1 of 1
Size Document Number REV
A CD1228-1 A
Title
FORUM MASTER MUTE
DDA, HOUNSLOW. MDDX, TW3 2EB, ENGLAND
LED5
RED
LED1
RED
LED1
VDD
R1
1K
MUTE1
MUTE1
SW1
2PSUJ
MUTE5
MUTE5
SW5
2PSUJ
V+LED
D1
D2
V+LED
R3
75R
LED1
TR1
BC212
V-LED
R2
33K
MUTE6
LED6
RED
SW6
2PSUJ
MUTE2
LED2
RED
SW2
2PSUJ
MUTE2 MUTE6
VDD
C2
2U2
63V
C1
2U2
63V
VIN
1
0
V
2
VOUT
3
IC1
78L05
V+LED
R4
100R
V+
0V
V-
1
2
3
CON2
3WAY
MH
MUTE7
LED7
RED
SW7
2PSUJ
MUTE3
LED3
RED
SW3
2PSUJ
MUTE3
LED4
RED
MUTE7
LED8
RED
MUTE1
V-LED
1 2
3 4
5 6
7 8
9 10
CON1
10WAY
IDCMH
MUTE2
MUTE4
MUTE6
MUTE8
MUTE3
MUTE5
MUTE7
MUTE8
MUTE8
SW8
2PSUJ
MUTE4
MUTE4
SW4
2PSUJ
MUTE/SCENE GROUPS
V-LED
Date: May 10, 1993 Sheet 1 of 1
Size Document Number REV
D CD1212-1 A
Title
FORUM AUXILIARY
TEL:(0)81-570-7161 FAX:(0)81-577-3677
DDA, HOUNSLOW, MIDDX, TW3 2EB, ENGLAND
RIBBON CABLE
TO REAR PANEL
XLR OR JACKS
R17
4K7
CON2-3
CON2-1
CON2-2
XLR3
XLR1
XLR2
V+
V-
7 8
SIL2D
10K
5 6
SIL2C
10K
C11
100/16
C12
100/16
R16
75R
R15
75R
5
6
7
IC3B
NE5532
C10
33P
V+
V-
5 6
SIL1C
4K7
3 4
SIL2B
10K
1 2
SIL1A
4K7
C8
100/16
1 2
SIL2A
10K
7 8
SIL1D
4K7
3 4
SIL1B
4K7
3
2
1
8
4
IC3A
NE5532
C9
33P
REMOVE FOR
-10dBV
PFL ENABLE
PFL AUDIO
R11
47K
R12
10K
R14
910
LK1
R13
2K
AFL
C7
100/16
R10
75R D1
RED
+17V
R19
3K3
SW1R7
680K
R8
4K7
R9
10K
C5
220N
C4
100
VR1
10K
3
2
1
8
4
IC2A
TL072
C6
33P
R3
10K
R4
10K
R5
10K
R6
75R
C3
33P
C1
33P
C2
22P
3
2
8567
4
IC1
NE5534 5
6
7
IC2B
TL072
AUX EARTH REF
AUX BUS 1
R1
75R
R2
100K
L1
0.22UH
AUX EARTH REF
AUX BUS 1
R21
75R
R22
100K
L21
0.22UH
R23
10K
C21
33P
3
2
8567
4
IC21
NE5534
C22
22P
R24
10K
R25
10K
C23
33P
5
6
7
IC22B
TL072
R26
75R
C24
100
VR21
10K
C25
220N
R27
680K
R28
4K7
R29
10K
3
2
1
8
4
IC22A
TL072
C26
33P
AFL
R30
75R
C27
100/16
D21
RED
SW21
REMOVE FOR
-10dBV
PFL ENABLE
PFL AUDIO
R32
10K
R31
47K
LK21
R33
2K
R34
910
V+
V-
C28
100/16
1 2
SIL21A
4K7
5 6
SIL21C
4K7
3 4
SIL21B
4K7
3 4
SIL22B
10K
1 2
SIL22A
10K
3
2
1
8
4
IC23A
NE5532
7 8
SIL21D
4K7
C29
33P
V+
V-
5 6
SIL22C
10K
7 8
SIL22D
10K
5
6
7
IC23B
NE5532
R35
75R
C31
100/16
R36
75R
C32
100/16
5 6
SIL42C
10K
C30
33P
RIBBON CABLE
TO REAR PANEL
XLR OR JACKS
R37
4K7
CON2-6
CON2-4
CON2-5
XLR5
XLR4
XLR6
RIBBON CABLE
TO REAR PANEL
XLR OR JACKS
R57
4K7
XLR9
XLR7
XLR8
CON2-9
CON2-7
CON2-8
V+
V-
7 8
SIL42D
10K
5
6
7
IC43B
NE5532
R55
75R
R56
75R
C52
100/16
C51
100/16
5 6
SIL62C
10K
C50
33P
V+
V-
C48
100/16
1 2
SIL41A
4K7
5 6
SIL41C
4K7
3 4
SIL41B
4K7
3
2
1
8
4
IC43A
NE5532
1 2
SIL42A
10K
3 4
SIL42B
10K
7 8
SIL41D
4K7
C49
33P
REMOVE FOR
-10dBV
PFL ENABLE
PFL AUDIO
R51
47K
R52
10K
LK41
R53
2K
R54
910
AFL
R50
75R
C47
100/16
D41
RED
SW41
3
2
1
8
4
IC2A
TL072
C44
100
VR41
10K
C45
220N
R47
680K
R48
4K7
R49
10K
C46
33P
C65
220N
3
2
1
8
4
IC62A
TL072
C42
22P
3
2
8567
4
IC41
NE5534
C41
33P
R43
10K
R44
10K 5
6
7
IC42B
TL072
C43
33P
R45
10K
R46
75R
C62
22P
AUX EARTH REF
AUX BUS 1
R41
75R
R42
100K
L41
0.22UH
AUX EARTH REF
AUX BUS 1
R61
75R
R62
100K
L61
0.22UH
R63
10K
C61
33P
3
2
8567
4
IC61
NE5534
R64
10K 5
6
7
IC62B
TL072
C63
33P
R65
10K
R66
75R
C82
22P
R85
10K
C64
100
VR61
10K
R67
680K
R68
4K7
R69
10K
C66
33P
C85
220N
3
2
1
8
4
IC82A
TL072
AFL
AFL
R70
75R
C67
100/16
D61
RED
R90
75R
C87
100/16
SW61
REMOVE FOR
-10dBV
PFL ENABLE
PFL AUDIO
R72
10K
R71
47K
LK61
R73
2K
R74
910
R93
2K
V+
V-
V+
C68
100/16
1 2
SIL61A
4K7
5 6
SIL61C
4K7
3 4
SIL61B
4K7
3 4
SIL62B
10K
1 2
SIL62A
10K
3
2
1
8
4
IC63A
NE5532
7 8
SIL61D
4K7
C88
100/16
1 2
SIL81A
4K7 3
2
1
8
4
IC83A
NE5532
C69
33P
V+
V-
7 8
SIL62D
10K
5
6
7
IC63B
NE5532
R75
75R
R76
75R
C71
100/16
C72
100/16
5 6
SIL82C
10K
R95
75R
C91
100/16
C70
33P
RIBBON CABLE
TO REAR PANEL
XLR OR JACKS
R77
4K7
CON2-13
CON2-14
CON2-12
XLR13
XLR14
XLR12
RIBBON CABLE
TO REAR PANEL
XLR OR JACKS
R97
4K7
CON2-16
CON2-17
CON2-15
XLR16
XLR17
XLR15
CON2-19
V+
V-
7 8
SIL82D
10K
5
6
7
IC83B
NE5532
R96
75R
C92
100/16
5 6
SIL102C
10K
R115
75R
C111
100/16
C90
33P
V-
V+
5 6
SIL81C
4K7
3 4
SIL81B
4K7
1 2
SIL82A
10K
7 8
SIL81D
4K7
C108
100/16
1 2
SIL101A
4K7 3
2
1
8
4
IC103A
NE5532
3 4
SIL82B
10K
C89
33P
REMOVE FOR
-10dBV
PFL ENABLE
PFL AUDIO
R91
47K
R92
10K
LK81 R94
910
R113
2K
AFL
D81
RED
R110
75R
C107
100/16
SW81
C84
100
VR81
10K
R87
680K
R88
4K7
R89
10K
C86
33P
C105
220N
3
2
1
8
4
IC102A
TL072
R83
10K
C81
33P
3
2
8567
4
IC81
NE5534
R84
10K
C83
33P
5
6
7
IC82B
TL072
R86
75R
C102
22P
R105
10K
AUX EARTH REF
AUX BUS 1
R81
75R
R82
100K
L81
0.22UH
AUX EARTH REF
AUX BUS 1
R101
75R
R102
100K
L101
0.22UH
FROM MASTER
R103
10K
C101
33P
3
2
8567
4
IC101
NE5534
R104
10K
C103
33P
5
6
7
IC102B
TL072
R106
75R
C104
100
VR101
10K
R107
680K
R108
4K7
R109
10K
C106
33P
D101
RED
SW101
REMOVE FOR
-10dBV
PFL ENABLE
PFL AUDIO
R111
47K
R112
10K
LK101 R114
910
-17V
V-
5 6
SIL101C
4K7
3 4
SIL101B
4K7
1 2
SIL102A
10K
3 4
SIL102B
10K
7 8
SIL101D
4K7
C109
33P
V+
V-
R121
10R
5
6
7
IC103B
NE5532
7 8
SIL102D
10K
R116
75R
C112
100/16
C110
33P
V+
OUTPUT AMPS
RIBBON CABLE
TO REAR PANEL
XLR OR JACKS
R117
4K7
XLR19
XLR20
XLR18
CON2-18
CON2-20
V-
V-
V+
EARTH TERMINAL
OUTPUT AMPS
OTHER AMPS
OTHER AMPS
R124
10R
C123
22/25
C124
22/25
+17V
0V
-17V
+17V
+17V
0V
0V
0V
0V
0V
-17V
-17V
R122
10R
R123
10R
C121
22/25
C122
22/25
D28
1N4148
D29
1N4148
R163
30K
+17V
Q1
BC560
Q2
BC560
R165
62R
R164
62R
+17V +17V
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC19
LM2901
D10
GRND9GRND8GRN
VCC
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC10
LM2901
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
IC11
LM2901
D17
GRN
D16
GRN
D15
GRN
D14
GRN
D13
GRN
D12
GRN
D11
GRN
D18
GRN
D19
YEL
D20
YEL
D21
YEL
D22
YEL
D23
YEL
D24
RED
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
121
LM2901
-17V D25
RED
D26
RED
D27
RED
+5-
4
O
2
+7-
6
O
1
+9-
8
O
1
4
+
1
1
-
1
0
O
1
3
+V
3
-V
12
122
LM2901
12
1314IC18D
TL074
J2
PK
J2
AV
R140
1K0
R139
10K
R138
47K
R137
27K
R136
1K1
5
6
7
IC18B
TL074
R135
100K
R128
220
10
9
8
IC18C
TL074
R133
20K
R134
10K
R132
20K
D6
1N4148
D5
1N4148
3
2
1
4
1
1
IC18A
TL074
R131
20K
1
2
3
R130
20K
R129
22K
R127
470K
MTR
+V3
1 2
3
R126
100K
-V3
R141
270K
D7
IN4148
C131
2U2
C130
22U
+17V
R162 18K
R161
4K7
R160
3K3
R154
220
R159
2K4
R158
1K6
R157
820
R156
680
R155
270
R147
150
R148
220
R149
270
R150
270
R151
330
R152
200
R153
220
R142
91
R143
36
R144
56
R145
68
R146
100
+V8
-V8
-17V
+17V
C132
47
C133
47
R166
10
R167
10
-17V
CHASSIS EARTH
C120
10N
R120
22R
Date: August 4, 1993 Sheet 1 of 1
Size Document Number REV
B CD1193-1 PC1317-1 A
Title
QMR/FORUM AUXILIARY CONNECTOR
DDA, HOUNSLOW, MIDDLESEX,TW3 2EB, ENGLAND
AUX1
1 3 2
CON1
XLRVM
1 2 34 5 6
JP1
6WAY
FHV
AUX3
1 3 2
CON3
XLRVM
1 2 3 45 6
JP3
6WAY
FHV
AUX5
1 3 2
CON5
XLR VM
1 2 3 45 6
JP5
6WAY
FHV
1 2
LK9
1 2
LK10
1 2
LK5
1 2
LK6
1 2
LK1
1 2
LK2
12
34
56
78
910
1112
1314
1516
1718
1920
CON9
20WY
IDCMDR
AUX6
1 3 2
CON6
XLRVM
1 2 3 45 6
JP6
6WAY
FHV
AUX4
1 3 2
CON4
XLRVM
1 2 3 45 6
JP4
6WAY
FHV
AUX2
1 3 2
CON2
XLRVM
1 2 34 5 6
JP2
6WAY
FHV
NOTE:-
THIS CONNECTOR
IS REVERSED
1 2
LK3
1 2
LK4
1 2
LK7
1 2
LK8
1 2
LK11
1 2
LK12
1
2
PL1
Date: August 22, 1994 Sheet 1 of 1
Size Document Number REV
B AS1341-3 A
Title
FORUM FRAME POWER WIRING
TEL: (0)81 570 7161 FAX: (0)81 577 3677
DDA LTD., HOUNSLOW, MIDDX., TW3 2EB, ENGLAND
GRN
BLUE
TO METERBRIDGE (IF FITTED)
0V
-17V
COPPER BAR
BRN
TO MICROFILE (IF FITTED)
+17V
MASTER MODL
EARTH STUD
GRN/YEL
GRN/YEL (50/0.25)
51 3
2 4 6
GRN/YEL (50/0.25)
GRN (50/0.25)
BRN MASTER MODL
COPPER BAR
COPPER BAR
+17V
0V
(NOT USED ON
FORUM MONITOR)
MASTER MODL
MASTER MODL
MASTER MODL
RELAY
-17V
+48VOR
WHT
BLUE
ALL WIRES TRI-RATED 24/0.2 UNLESS STATEDPSU CONN
PSU CONN
PSU CONN
PSU CONNRELAY
+48V
-17V
+17V
BLUE
ORANGE
WHITE
BROWN1
2
3
4
5
6
7
8 GRN/YEL
MASTER MODL CONNECTOR
CHASSIS STUD
Date: February 14, 1995 Sheet 1 of 1
Size Document Number REV
B CD1239-1 A
Title
POWER DISTRIBUTION (PC1357-1)
TEL:(0)81-570-7161 FAX:(0)81-577-3677
DDA, HOUNSLOW, MIDDX, TW3 2EB, ENGLAND.
TO MIDI
MODULE
D3
1N4001
1 2
LK2
1 2
LK1
1
2
3
4
5
6
7
8
CON1
8WAY
METWAY
C1
4700U
25V
D1
1N5402
+18V
C3
4700U
25V
VIN
1
0
V
2
VOUT
3
REG1
7805
0V
R1
27R
7W
C5
220U
25V
1
2
3
CON2
3WAY
METWAY
LK1 & LK 2 FITTED
R1,C3,C5,D3,REG1 NOT FITTED
THIS SUPPLIES +18V TO MIDI MODULE
N.B. NORMAL CONSOLE FITTED AS:
-18V
C2
4700U
25V
D2
1N5402
MWKGROUND
+48V
C4
100N
0V
R11
100R
LITTLELITE
1
2
3
CON13
3WAY
METWAY
R7
27R
7W
R8
27R
7W
+18V
0V
LITTLELITE
1
2
3
CON11
3WAY
METWAY
+18V
0V
R3
27R
7W
R4
27R
7W
+18V
0V
-18V
1
2
3
CON3
3WAY
METWAY
TO LED
METERBRIDGE
TO MICROFILE
MOTHERBOARDS
+18V
0V
-18V
1
2
3
CON4
3WAY
METWAY
R5
27R
7W
R9
27R
7W
LITTLELITE
1
2
3
CON14
3WAY
METWAY
R10
27R
7W
-18V
0V
LITTLELITE
1
2
3
CON12
3WAY
METWAY
-18V
0V
R6
27R
7W
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