X-Ray Controller Assembly Boards; I/O And Logic Board; Low Voltage Power Supply - Hologic QDR 4500 Technical Manual

Signal Description
LIGHTON+ States whether the X-Ray beam is ON/OFF. This
LIGHTON- signal controls the X-Ray ON lights of the C-Arm
Control Panel, the table Control Panel, and the
Operator's Console Power Module. It also controls a
remote X-ray ON light through the Power Module
when one is connected.
IBEAM+ Value of current pulses at the X-ray source. This is a
IBEAM- frequency modulated diagnostic signal whose
frequency is proportional to the quantity being
monitored.
kVp+ Value of voltage pulses at the X-ray source. This is a
kVp- frequency modulated diagnostic signal whose
frequency is proportional to the quantity being
monitored.
XRFAULT+ States whether or not any fault condition exists in the
XRFAULT- X-Ray Controller Assembly.

X-Ray Controller Assembly Boards

The following sub-sections describe the five individual boards that make up the X-Ray
Controller Assembly and illustrates and describes their interconnection signals.

I/O and Logic Board

The I/O & Logic Board receives control signals from the C-Arm Controller and provides timing
and reference signals for the operation of the XRC. It also regulates AC power to the X-ray tube
filament so as to generate the desired beam current. A power frequency timing reference signal
(AC_LINE) is returned to the C-arm controller for synchronizing the operation of the detectors to
the X-ray source.

Low Voltage Power Supply

The Low Voltage Power Supply generates the DC voltages used in the X-Ray Assembly. It
generates regulated +5, +15 and -15V used on the I/O and Logic board. It also generates
unregulated +20 and -20V that are applied to the Duty Cycle Driver board to generate the
regulated voltages used by the Duty Cycle Driver board.
In addition, the Low Voltage Power Supply applies switched 240VAC to the PFR Substitution
board and unswitched 120VAC to the I/O and Logic board. The unswitched 120VAC is used to
provide AC power for the X-Ray tube filament transformer while the switched 240VAC is used
to generate the anode potential.
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QDR 4500 Technical Manual
I/O
C-Arm Logic XRC
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