DEC VT220 - 9.2.1 AC Input Components

9.2.1
AC Input Components
The ac input components provide for ac input, including voltage
range (115 Vac or 230 Vac) selection. Figure 9-3 shows the
following ac input components.
• EM! filter filters ac input which is connected by
power cord directly into the EMI filter.
• 51 is the power on/off switch (51 is shown in off
position in Figure 9-3).
• 52 -- is the voltage selection switch (52 is shown at 115
Vac selection in Figure 9-3).
• Fl -- is a 2, 250 Vac input line fuse.
• Chassis ground lug -- provides ground connection of ac
input ground from LMI filter.
AC
INPUt
EMf
FILTER
CHASSIS
GROUND
LUG
J501
AC
INPUTS
TO
PS
PS
AND MONITOR
BOARD
.... ·OM1 ....
Figure 9-3 AC Input Components Block Diagram
9-3