Mackie Digital 8-Bus Service Manual page 17

CODEC BOARD
Analog Analog
IC
OUT
U52 BUS-1 BUS-2
BUS-3 BUS-4
U152
U252
BUS-5 BUS-6
U352 BUS-7 BUS-8
U452
MIX-L MIX-R
U552
SOLO-L SOLO-R
U652
AUX-1 AUX-2
U752 AUX-3 AUX-4
U852
AUX-5 AUX-6
U952
AUX-7 AUX-8
U1052
AUX-9 AUX-10
U1152
AUX-11 AUX-12
Analog Analog
IC
IN
LINE-13 LINE-14
U3
U103 LINE-15 LINE-16
U203 LINE-17 LINE-18
LINE-19 LINE-20
U303
U403 LINE-21 LINE-22
U503
LINE-23 LINE-24
U603
RET-1 RET-2
U703 RET-3 RET-4
U803 RET-5 RET-6
U903
RET-7 RET-8
U1003
RET-9 RET-10
RET-11 RET-12
U1103
U4
METER-L METER-R
How it is labeled
DT
out of DSP board
from DSP
OUT
DT1
DT2
DT3
DT4
DT5
DT6
DT7
DT8
DT9
DT10
DT11
DT12
DR to DSP
IN
DR1
DR2
DR3
DR4
DR5
DR6
DR7
DR8
DR9
DR10
DR11
DR12
METER_DR
Connector/pin
DT_1 J13-1
DT_3 J13-5
DT_5 J13-9
DT_7 J13-13
DT_9 J13-17
DT_11 J13-21
DT_13 J13-25
DT_15 J13-29
DT_17 J12-1
DT_19 J12-5
DT_21 J12-9
DT_23 J12-13
How it is labeled
Connector
into DSP board
/pin
DRO_U1 J13-3
DRO_U2 J13-7
DRO_U3 J13-11
DRO_U4 J13-15
DRO_U5 J13-19
DRO_U6 J13-23
DRO_U7 J13-27
DRO_U8 J13-31
DRO_U9 J12-3
DRO_U10 J12-7
DRO_U11 J12-11
DRO_U12 J12-15
METER_DR J13-33
The Data transmitted
(DT) from the DSP board
is converted to Analog
and split out into its two
component signals. For
example, DT_1 comes
off the DSP board to the
CODEC (using J13 pin 1),
where it is renamed DT1.
U52 converts DT1 into
analog signals BUS-1
and BUS-2.
The analog signals, such
as Bus, Aux, Mix and Solo
then go off to the DCA
board via J11
Analog signals are
converted to digital
and combined in pairs.
This gives the Data
Received (DR) which
goes off to the DSP
board.
For example, analog
signals Line 13 and Line
14 are converted by U3
on the CODEC board to
become digital signal
DR1. This passes to the
DSP board via J13 pin 3,
where it is renamed
DRO_U1.
17
DSP SIGNAL FLOW