SYSTEM TECHNICAL MANUAL
HARDWARE DESCRIPTION
Current limiting and over voltage protection are provided. The
electrical power is enough for both the computer and its interfaces
and options, but printers and free-standing disk drives require their
own ac power source. The following power line transients should
not affect the specified performance:
Input Voltage
Duration Frequency of Occurrence
50% of nominal
1/2 cycle Once in 10 seconds
The power supply assembly is available in three models:
• For a power source with a nominal voltage of 120 Vac
• For a power source with a nominal voltage of 22QVac
• A model that can be strapped to suit power sources with
nominal voltages of 100, 230, or 240Vac
These different models of the power supply are identified by
the “Power Code,” which is a part of the model number.
Power Code
Nominal Voltage
60 120 Vac
65
220 Vac
70*
100 Vac
74* 230 Vac
75*
240 Vac
* Selectable by transformer strapping
The strapping of the transformer for power supplies with
power codes 70, 74, and 75 is shown in Figure 2.15.
2-23
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