Moog Focal 903, User Manual

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903-0628-00 Rev. 1 Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp. Page 3-7
3.2.1 Standard -X Backplanes
Card P/N: 903-7213-00; 903-7210-00
The standard -X backplanes described in this section are used on the 4VID (BP P/N: 903-7213-00,
28 HP) and 8VID (BP P/N: 903-7210-00, 44 HP) console modules.
Assembly views of a 28 HP -X backplane PCB (CBP-121-XR/XC) and a 44 HP -X backplane PCB
(CBP-241-XR/XC) are given in Figure 3-6 and Figure 3-7 respectively. The bottom side of the backplane
faces outwards from the assembly and is accessible by removing the back cover plate. Fuse F1 is a standard
replaceable glass cartridge type for the primary power input (fuse value depends on type of power supply).
Header J15 is a serial number programming port; J13 is a connector to the chassis fan. Rail voltages and
grounds are directly accessible via screw terminals J18, J19, J9, J17, and J10 for +12 V, -12 V, +5 V, AGND
(analog ground), and DGND (digital ground) respectively.
Primary power inputs are wired into screw terminals:
 J16 is not connected for AC sources and acts as the 0V reference for DC sources
 J12 is neutral for AC sources and is not connected for DC sources
 J11 is line for AC sources and +V input for DC sources
 J14 is an earth connection that is made through the power supply module to the mechanical rack, but
is otherwise isolated from all other grounds unless external connections are made
As a default configuration, AGND and DGND are connected on the backplane through a
ferrite bead. Insulating covers are used over the primary terminals as a safety precaution
and must not be removed while the rack is connected to mains power.
For 230 VAC inputs, typically there are two line connections rather than line and neutral.
The neutral wires and terminals should always be assumed to be at high voltage.