Distribution Board; Power; Figure 2-1. Communications Controller Board/Distribution Board Interconnection Diagram - Hologic QDR 4500 Technical Manual

COMMUNICATIONS
CONTROLLER
BOARD
Figure 2-1. Communications Controller Board/Distribution Board

DISTRIBUTION BOARD

The Distribution board provides interconnections between the QDR 4500 Operator's Console and
the Scanner. It passes several signal and power lines from the Operator's Console directly to the
C-Arm Interface module. It also provides buffering and individual drivers and receivers for
various signal lines to and from individual Scanner modules and the Communications Controller.
The Distribution board is located in the Electronics Tray in the base of the Scanner.
Three cables connect the Operator's Console to the Distribution board. One cable connects the
communications buss to the Communications Controller located in the Operator's Console
computer. Two cables connect to the Operator's Console Power Module. These two cables
connect power to the Distribution board and connect the X-Ray On and Emergency signal lines
to the Power Module.
Eight cables connect the Distribution board to the various Scanner boards. Four cables connect
to the four Motor Controller boards (Table X, Table Y, Arm R, and Arm Y). Two (one signal
and one power) connect to the C-Arm Interface board. One connects to the TZ Drive board.
And, one connects to the Scanner's Control Panel Controller board.
The Distribution board has provision for three jumpers that can be installed to override the
EMERGENCY signal lines when trouble-shooting.

Power

The Distribution board receives +28, +24 and +/-15VDC from the Operator's Console Power
Module. The +28VDC is applied through four individual circuit breakers to the Table X, Table
Y, Arm R, and Arm Y Motor Controller boards. The +24 and +/-15VDC are passed to the C-
Arm Interface board. +24VDC is also applied through a circuit breaker to the Table Z Drive
board. It is also reduced to +7 and + 5VDC by regulators to power op-amplifiers and analog
switches located on this board. The + 7VDC is passed to the Table Z Drive and Control Panel
Controller boards. The + 5VDC powers the digital section of the Distribution board. The +28
and +24VDC power supplies are not closely regulated and their outputs may range from +24V to
+ 35V under normal conditions.
Section 2 - Functional Description
ATD+, ATD-
STD+, STD-
STCLK+, STCLK-
STFRM+, STFRM-
ARD+, ARD-
SRD+, SRD-
SRCLK+, SRCLK-
SRFRM+, SRFRM-
EMERGENCY_IN+, EMERGENCY_IN-
ZEROX+, ZEROX-
INTEGRATE+, INTEGRATE-
SYSRESET+, SYSRESET-
EMERGENCY+, EMERGENCY-
Interconnection Diagram
DISTRIBUTION
BOARD
2-3