Hologic QDR 4500 Technical Manual page 56

protection for each power line using resettable circuit breakers with visual fault indication
located on the Power Control Panel.
The Power Board contains the connectors to all power supplies, circuit breakers, and key lock
switch. It also contains two relays that switch power to the Scanner's X-Ray unit and to an
external X-Ray On light. Indicators on the Power board, provide visual indication of the status
of the +15, -15, and 24VDC voltages and of the X-Ray enable signal.
Figure 2-18 provides a block diagram of the Power Module. Table 2-24 identifies the Power
Module connectors.
Table 2-24. Power Control Board Connectors
AC power in from transformer
AC power to Computer circuit breaker
AC power to Power Strip (Computer, Monitor, Printer power)
AC power to 15V power supply circuit breaker
AC power to 15V power supply
+/-15VDC from 15V power supply
AC power to DC power supply circuit breaker
AC power to DC power supply
Enable signal to DC power supply and +24VDC from DC power supply
X-Ray Enable Key switch
AC power to X-Ray Controller circuit breaker
AC power to X-Ray Controller
AC power to Aux X-Ray Lamp Outlet circuit breaker
AC power to Aux X-Ray lamp outlet
AC power to Left Pedestal circuit breaker
AC power to Right Pedestal circuit breaker
AC power to TZ Drive Controller (Left/Right Pedestal)
DC voltages to Scanner and Emergency signal from Scanner
2-34
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QDR 4500 Technical Manual
Connection Connector
P17
P15
P16
P5
P4
S2
P7
P6
S1
S4
P11
P12
P13
P14
P8
P10
P9
S3