User's Manual Part 3

Backplane/Interface Boards - 122 -
®
Affinity LBD-200C-N1 Transmitter
Product Manual
16 Backplane/Interface Board Description
16.1 Front-End Power Supply Backplane
The Front-End Power Supply Backplane is the electrical and physical receptacle for the
Front-End Power Supply assemblies. The backplane board is mounted to the Affinity® Chassis
and provides AC voltage to the Front-End Power Supplies. The DC output voltages from the
Front-End Power Supplies are applied to the backplane to be used as a source of power for the
Driver section and PA plug-in modules. The Front-End Power Supply Backplane also contains a
diagnostic interface that can be used, via the Omnitronix SL81 Status Monitoring and Control
System (SMCS), to monitor Front-End Power Supply status.
Front-End Power Supply Backplane board
AC power from the rear panel enters the Front-End
Power Supply Backplane board through connectors J3,
J4, and J5. The AC source enters the Front-End Power
Supplies through backplane connector J11. DC output
power from the Front-End Power Supplies is present on
J12 of the backplane board where it is distributed to the
other modules via backplane connector studs J6 and
J7. The 24-position dual row connectors, J1 and J2, are
used to communicate and monitor the other modules in
the sub-chassis. Three-position single row connector J9
and nine-position single row connector J10 connect to
the amplifier motherboard to establish communications
between the Driver Backplane board and PA segments.
16.2 Driver Backplane
The Driver Section (Power Supply and Upconverter modules) is electrically, and physically
connected to the Driver Backplane when plugged into the Chassis assembly. The connectivity
is established when the push-button switch located on the backplane is depressed. This occurs
when the Driver Section Power Supply is plugged into the Chassis. Removing the Driver
Section Power Supply Module will also remove power from the Driver Backplane. This is done
to prevent arching during a Hot Swap operation.
The Driver Backplane provides +8V
DC, +12 VDC, -12 VDC, +24VDC and ground for the Driver
Section. The Driver Backplane also contains multidrop communication connectivity used by the
Driver Section assemblies.