Ac Capacitor; Prime Power Box; Ferrotransformer; Lower Frame - IBM 3278 Series Maintenance Information

3. Remove the screw holding the assembly to the
lower frame. (The screw is located at the bottom
center of the assembly.)
4. Slide the assembly partially from the display sta-
tion, and disconnect the two cables connected on
the back of the assembly.
5. Slide the assembly from the display station.
6. Reinstall in the reverse sequence.
7. Use the adjustment procedure in paragraph 5.4
for the +44 V power supply.
6.2.2 AC Capacitor
1. Holding the insulated handle of a screwdriver,
short out the capacitor terminals with a metal
shaft to discharge the capacitor.
2. Remove the rubber cover from the top of the
capacitor (see Figure 4-3). and slide it back on the
wire leads.
3. Pull the two leads from the capacitor terminals.
4. Pull the capacitor from the spring holder.
5. Reinstall in the reverse sequence. (This capacitor
has no polarity.)
6.2.3 Prime Power Box
1. Disconnect the cable connectors plugged into the
rear and top of the prime power box (see Figure
4-3).
2. Remove the ac capacitor as described in
paragraph 6.2.2.
3. Disconnect the line cord from the receptacle if
not previously done.
4. Remove the two screws holding the prime power
box to the front of the frame.
5. Remove the assembly from the machine.
6. Reinstall in the reverse sequence.
6.2.4 Ferrotransformer
1.
Remove the low-voltage power supply shield.
2. Remove the leads from the ac capacitor as
described in paragraph 6.2.2.
3. USA/Canada: Remove the ferro connector from
the prime power assembly.
6-2
SY27-2510-6