Service manual

1
2
3
4
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7
8
9
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12
13
14
D+
D-
VBUS
DGNDU
HID0
HID1
HID2
SEL0
SEL1
VCCCI
AGNDC
VINL
VINR
VCOM
SSPND
VDDI
DGND
DOUT
DIN
VCCXI
AGNDX
XTI
XTO
VCCP2I
AGNDP
VCCP1I
VOUTL
VOUTR
28
27
26
25
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23
22
21
20
19
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PCM2900
USB Audio Codec Channel 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
Cue
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
Audio bus
47uF
10K
10K
10K
10K
10K
47uF
10K
10K
10K
10K
10K
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)
1.5K
+
1uF
+
+
+
1uF
1uF
1uF
+5V
+
+
+
10uF
10uF
23.7 ohms
23.7 ohms
10uF
+
5532
U2A
1
2
3
_
22.1K
150pF
4.75K
8
+12V
+
6.81K
510pF
na
+
5532
U2B
7
6
5
_
32.4K
150pF
8.25K
8
+12V
+
10K
510pF
na
USB
2 1
3 4
+5V
Vcc
Enable
+5V
CTS5-CB3
12M00000
1
D+
D-
Vcc
Gnd
Shell
4
2
3
Autocue bus
1.5K
22K
47K
3904
+5V
3.9K
-5V
3906
RS232 PC
Logic
Channel On = (+)5V
Channel Off = (-)5V
10K
10K
10K
10K
Av= 10dB
(-2dBu = 1.7VPtoP)
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
26.7K
1.78K
Av= -24dB
26.7K
1.78K
Record in
from stereo
anti-aliasing
filter identical
to the Play filter
in this drawing
Note: the anti-
aliasing filters
are 0.5dB down
at 15kHz and
0.9dB down at
20kHz
1.26