Mackie d8b v3, Service Manual

Page: 17 / 117

17
DSP SIGNAL FLOW
CODEC BOARD
U52
U152
U252
U352
BUS-2 DT1 BUS-1
IC Connector/pin
Connector
/pin
DT
from DSP
Analog
OUT
Analog
IN
Analog
IN
Analog
OUT
BUS-4 DT2 BUS-3
BUS-6 DT3 BUS-5
BUS-8 DT4 BUS-7
U652
U752
U1052
U1152
AUX-11 AUX-12 DT12
AUX-9 AUX-10 DT11
AUX-7 AUX-8 DT10
AUX-5 AUX-6 DT9
AUX-3 AUX-4 DT8
AUX-1 AUX-2 DT7
U452
U552
SOLO-L SOLO-R DT6
MIX-L MIX-R DT5
DT_1
How it is labeled
out of DSP board
How it is labeled
into DSP board
DT_3
DT_5
DT_7
DT_23
DT_21
DT_19
DT_17
DT_15
DT_13
DT_11
DT_9
J13-1
J13-5
J13-9
J13-13
J12-13
J12-9
J12-5
J12-1
J13-29
J13-25
J13-21
J13-17
U852
U952
IC DR to DSP
U3
U103
U203
U303
LINE-14 DR1 LINE-13
LINE-16 LINE-15
LINE-18 LINE-17
LINE-20 LINE-19
DR2
DR3
DR4
U403
U503
U603
U703
LINE-22 DR5 LINE-21
LINE-24 LINE-23
RET-2 RET-1
RET-4 RET-3
DR6
DR7
DR8
U803
U903
U1003
U1103
RET-6 DR9 RET-5
RET-8 RET-7
RET-10 RET-9
RET-12 RET-11
DR10
DR11
DR12
U4
METER-L METER-R METER_DR
DRO_U1
DRO_U2
DRO_U3
DRO_U4
DRO_U5
DRO_U6
DRO_U7
DRO_U8
DRO_U9
DRO_U10
DRO_U11
DRO_U12
METER_DR
J13-3
J13-7
J13-11
J13-15
J13-19
J13-23
J13-27
J13-31
J12-3
J12-7
J12-11
J12-15
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.