IBM 3278 Series Maintenance Information page 168

Dual intensity: The ability to have two levels of
brightness for the characters displayed on the display
screen.
Ferro: The ferrotransformer. (See Figure 4-3.)
Filament: An internal part of the CRT, located in
the neck, that glows when voltage is applied.
Flyplate: The part of the key module, suspended on
springs, that snaps on the circuit board when the
key button is pressed.
Handrest: The part of the keyboard cover where the
heel of the hand can be placed for greater ease in
entering data and operating the repeat-action keys.
Keybutton: The molded key top that is installed on
the keystem.
(M):
The logic type using two base cards. (See
Figures 1-2,4-8, and 4-9.)
Mask: The frame surrounding the display screen.
(See Figure 4-5.)
Neck: The narrow portion of the CRT between the
bell and the CRT socket. (See Figure 5-1.)
Prime: The compartment where the power cord is
attached to the display station.
Raster: The visual sweep of the electron beam on the
display screen. The raster is normally present only
when the intensity control is in the override position.
Security Keylock: A key-operated switch that allows
use of the display station.
Sweep: A single movement of the electron beam,
either vertically or horizontally, on the display screen.
Top card connector: A connector that is used to
provide additional connections between two or
more logic cards that have connectors on the edge
of the card opposite the card base.
Yoke: The deflection coil assembly that is installed
on the CRT neck. (See Figures 4-5 and 5-1.)
A·2
SY27·2510-6