On/Off Switch; Brightness And Audible Alarm Volume Controls; Normal/Test, Base Color. And Oualcase/Monocase Switches - IBM 3279 2A Maintenance Information

3279 MIM
4.4.1 ON/OFF Switch
1. Remove the bezel (see section 4.4).
2. Release the internal power cable from the clamp
near the ON/OFF switch.
3. Press to one side the plastic catch at the side of
the switch, and pull the switch out. Remove
the power supply (see section 4.5.2).
4. Unplug connector P2 from the prime power box.
5. Reinstall in reverse sequence ..
Figure 4-2. ON/OFF Switch
4.4.2 Brightness and Audible Alarm
Volume Controls
I. Remove the bezel (see section 4,4).
2. Pull off the two knobs.
3. Remove the tape from around PII and unplug
it.
Release the mounting bracket from the
inside of the bezel.
4. Reinstall in reverse sequence.
5. Wrap two turns of adhesive tape around PII to
insulate the contacts (150 V) and hold the plug
and socket together.
Chapter 4. Removal and Replacement Procedures 4-2
Figure 4-3. Brightness and Audible Alarm Volume
Control Assembly
4.4.3 Normal/Test, Base Color, and
Dualcase/Monocase Switches
Three switches on the upper right of the bezel are
removed as follows:
I.
Remove the bezel (see section 4.4).
2. Disconnect the wiring to the switch.
3. Pinch the spring clips together and push the
switch and clip out through the front of the .
bezel.
4. Reinstall in reverse sequence.
Figure 4-4. Switches