IBM 3270 Operator's Manual page 112

108
Extras for the 3270
latch located in the center of the front edge of the cover, just
below the display tube. As the cover is released, lift it off the
two guide pins that hold it to the base of the unit. Then, turn the
alarm adjustment knob to the right or left, to raise or lower the
volume as needed. You should test the new volume level before
replacing the cover.
To test the new volume level, the next-to-Iast character
position must be in an unprotected input field. If your display
station does not have an unprotected input field in this area of
the screen, check the application program User's Guide or ask
your supervisor for instructions to obtain one. When you have an
unprotected input field in this area of the screen, move the
cursor and key in a character in the next-to-Iast position on the
screen; then, listen to the level of the alarm. To check the sound
level again, press the backspace key and, then, a character key. If
the sound is not at the desired volume, readjust the alarm control
knob and test the sound level again. When the volume setting is
correct, press the E RASE I NPUT key and replace the display
station front cover.