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3-48 Chapter 3: Hardware Service
Power Supply
The power supply provides power to the 7458 Terminal, as well as
various retail peripherals through the powered connectors. The power
supply is controlled by a logic on/off switch, which permits it to be
disabled through software. An AC outlet without a switch is provided
at the rear of the power supply for AC power to a CRT
Other features include:
• Internal UPS including a battery charger and harness to 24 V lead
acid batteries
• Un-switched AC convenience outlet (for CRT)
• Auto sensing for 115 VAC/230 VAC operation
• Cooling fan
• TTL voltage compatible UPS signal harness (~UPS_OFF,
AC_GOOD, ~BATT_SENSE, and BATT_LO signals)
• AUX peripheral power harness
Functionally, the terminal’s ON/OFF switch controls the power supply
control logic (~REM_EN) to activate the power supply. This switch
does not control actual AC mains voltage applied to the power supply.
AC Input
The power supply operates with the following voltage ranges.
Range Nominal
Vrms
Minimum
Vrms
Maximum
Vrms
Input Current Max. Arms
Including CRT
Convenience Outlet
LOW (115) 100-127 90 136 5.3 A 8.3 A
HIGH (230)
200-240 180 265 2.6 A 4.6 A
DC Outputs
The power supply has the following DC outputs:
Voltage
+3.3 V +5 V +12 V -12 V +5 VSB +24 V
Max. Current
10.0 A * 12.0 A * 11.5 A 0.25 A 2.0 A 2.3 A