Service manual

+
2019
U1
7
4
6
2
3
_
1
8
+48
VDC
Mic Channels Schematic 8/21/2007Rev AARC Console Arrakis Systems
+
+
+
5532
U2A
1
2
3
_
40.2K
10pF
+
CD4053
U4C
12
13
14
11
X/Y
ctrl
Y
X
6
inh
CD4053
U3B
5
3
4
9
X/Y
ctrl
Y
X
6
inh
CD4053
U4B
5
3
4
9
X/Y
ctrl
Y
X
6
inh
47uF
47uF
10K
4049
U5D
109
4049
U5E
12 11
2.2k
0.047uF
100k
0.47uF
+
+
+
5532
U2B
7
6
5
_
40.2K
10pFF
+
CD4053
U3A
2
1
15
10
X/Y
ctrl
Y
X
6
inh
CD4053
U4A
2
1
15
10
X/Y
ctrl
Y
X
6
inh
47uF
47uF
10K
Vdd
+5V
Vee
(-)5V
Vee
(-)5V
Fader
4049
U5F
15
14
1.0k
4049
U6D
109
4049
U6E
12
11
2.2k
0.047uF
100k
0.47uF
4049
U6F
15
14
1.0k
4049
U7D
109
4049
U7E
12 11
2.2k
0.047uF
100k
0.47uF
4049
U7F
15
14
1.0k
4049
U7C
67
4049
U7B
4 5
2.2k
0.047uF
100k
0.47uF
4049
U7A
2
3
1.0k
Mic Talkback
to Studio
Pgm L
Aud L
Pgm R
Aud R
10k
10k
ON/OFF
PGM
AUD
CUE
+12V
22.1k
2N3904
+12V
ON
OFF
ON/OFF
475
475
1k
Vss
8
7
16
7
1
+12V
8
+12V
+12V
+12V
+12V
10k
6.81K
6.81K
6.81K
4 3 3 4
2 1 1 2
3
2
1
4 na
Top
Btm
Remote Channel
On-off w Tally
100
6.8k
6.8k
22uF, 63V
22uF
63V
22uF, 63V
10k
10k
12V
12V
12V
12V
150pF
10 ohms
1.0k
Rf = trimpot + 10 ohms
Rf = 10 then Av= 1000 (60dB)
Rf = 1000 then Av= 10 (20dB)
Audio bus
47uF
10K
10K
10K
10K
10K
47uF
10K
10K
10K
10K
10K
(-)12V
+12V
8
4
+5V
(-)5V
Note on CD4053 Control
Ctrl = 1 then Y = on, X = off
Ctrl = 0 then X = on, Y = off
Fader & Bus Assignment schematic
Input preamp schematic
Logic schematic
(-14dBu)
(-2dBu)
Note on CD4053 Headroom
At +(-)5V Vdd and Vee, the CD4053
clips at +13dBU for 15dB of headroom
above the nominal (-)2dBU level.
(-2dBu)
Nominal Input Level
(-)62dBm to (-)22dBm
CR Mute Bus
10K
10K
10K
10K
dBu
-50
-20
-10
-2
0
+4
+8
+10
+13
+19
+19.8
VPtoP
0.0069
0.22
0.69
1.7
2.2
3.5
5.5
7.0
10.0
20.0
21.5
Fader in hand
= -12dB
Mic
Audio
Input
1.22