Figure 2-18. Power Module Block Diagram - Hologic QDR 4500 Technical Manual

Operator's Console and consists of a Main Power circuit breaker, a Power On indicator, an AC
line input isolation transformer, a Power Control Panel, a Power board, a +/-15VDC power
supply board, a 24VDC power supply board, and a computer power outlet.
MAIN
CIRCUIT
BREAKER
CB
100/120/220 VAC
50/60 Hz

Figure 2-18. Power Module Block Diagram

The Main Power circuit breaker, Power On indicator, and computer power outlet are located on
the back of the Power Module near the bottom. The isolation transformer, Power Board, and +/-
15VDC and 24VDC power supply boards are located within the Power Module enclosure.
The Power Control Panel is the Power Module's right side panel and it contains several circuit
breakers, switches, and indicators. It also contains a power outlet for connecting an external X-
Ray On light. Separate power switches are provided for the computer and the Scanner allowing
the computer to be operated separately. A key lock switch is used to switch power on/off to the
Scanner's X-Ray unit, and to the stepper motors. The Power Module provides over current
Section 2 - Functional Description
COMPUTER
SWITCH
SW
ISOLATION
TRANSFORMER
and
VOLTAGE
SELECTION
INSTRUMEN
T
SW
2 PHASE
120 VAC
COMPUTER
CIRCUIT
BREAKER
COMPUTER
CB
OUTLET
+/-15V
SUPPLY
CIRCUIT
BREAKER
+/-15V
CB
POWER
SUPPLY
24V
SUPPLY
CIRCUIT
BREAKER
DC
CB
POWER
SUPPLY
X-RAY, MOTOR
ENABLE
KEY LOCK
X-RAY
SWITCH
CONTROLLER
CIRCUIT
SW
BREAKER
X_RAY
CB
RELAY
AUX X-RAY
OUTLET
CIRCUIT
BREAKER
INDICATOR
CB
RELAY
LEFT
PEDESTAL
CIRCUIT
BREAKER
CB
RIGHT
PEDESTAL
CIRCUIT
BREAKER
CB
120
+/-15 VDC
24 VDC
28 VDC
EMG24IN
120 VAC
X_RAY_ON
120 VAC
240 VAC
240 VAC
2-33