Manual

doepfer
System A - 100 9. Appendix
29
9.1 Adding a 5V power supply
Some A-100 modules, for instance the A-113, A-190 or
A-191, need an extra 5 V power supply, as well as the
standard one. You can provide this with the A-100
NT5 5 V supply (or in certain circumstances, you can
use the 100 AD5 5 V adaptor - see 9.2).
A
If you are considering installing and
connecting the NT5, it’s crucial to take
note of the following safety instructions:
•
The installation and connection of the
NT5 must only be carried out by a
qualified electrician or technician.
•
If no suitable expert is available, the
rack must be sent to a service centre
or direct to Doepfer Musikelektronik
for the power supply to be fitted.
•
Danger! Before installation and
connection of the power supply, it is
essential that the whole rack is isola-
ted completely from the mains current.
The 5V power supply needs to be mounted near to the
main power input, on the blank upper back panel with
four stand-offs, nuts, serrated washers, and bolts.
Newer back panels (about since summer 1999) are
already equipped with 4 monting holes required for the
5V supply. For back panels manufactured earlier the 4
holes have to be drilled to receive the power supply
fixing bolts (Ø from. 3 to 3.5mm).
The NT5 connection diagram (Fig. 10) is on the next
page. Check again that the rack is totally disconnected
from the mains power supply, then:-
D
Remove the two 115/230V mains cables (normally
blue and black or brown cables) from the 12V
power supply mains input, and reconnect them to
the corresponding mains connectors on the 5V
supply. The case shield / GND cables/connections
remain unchanged as the shielding is connected
directly to the metal frame (the yellow/green cable).
D
Join up the two parallel connectors from the 5V
mains input to the mains input of the 12V supply
(using the correct wires from the blue and black or
brown ones supplied).
D
Connect the two low voltage outputs of the 5V
supply (ground and +5V) to the system bus board
which requires the 5V supply.