Installing Dac Sub-Boards - pro bel 4429 Technical Manual

2.2

Installing DAC sub-boards

One or two 5635 DAC sub-boards can be fitted to the standard 4429 extractor at any
time to provide analogue audio outputs. DAC 1 provides analogue versions of the
first stereo pair, whilst DAC2 provides analogue versions of the second audio pair
from the selected group.
The converter should only fit one way round into the 4429 base module, since the
two header plugs are of slightly different sizes.
Proceed as follows:
•
remove the 4429 base module from the frame
•
fit the converter(s) as shown in the diagram, taking care to line up the pins with
the base board headers
•
push the converter gently into its sockets, taking care not to bend any pins
•
re-insert the module into the frame
Note: Removal and insertion of the 4429 module may be done with the frame
powered
+12V TP14
TP5
+5V
+15V TP6
-15V TP7
TP4
0V
LOCAL
REMOTE
REMOTE
LOCK 1
LOCK 2
INIT
RA1
RA2
AD
VD
ER
RESET
POWER
Note: In this drawing the silkscreen writing on the 5635 ADC sub-board is shown the
right way up for clarity. The actual board may have inverted text.
6
ADC 1
RV2
LEFT
P
RV1
5635
RIGHT
P
4429
11 pin connector
RV2
LEFT
P
RV1
5635
RIGHT
Fitting a 5635 DAC sub-board
chapter 2
12 pin connector
4429
2
10
Issue 1