IBM 4975 02L Maintenance Information page 78

Removal
CAUTION
The print head may be hot after continued use. Always
let the head cool before removing it.
1. Switch off the printer power.
2. Remove the access cover (3051).
3. Move the print head to the center of the printer.
4. Remove the paper deflector and platen (3101).
5. Remove the ribbon cartridge (3405).
6. Remove the head cover (two screws) at
e.
7. Remove the print head forms guide (3352).
8. Remove the print head ribbon shield (3355).
9. Remove the copy-control dial (3357).
10. Remove the print head cable from EC3
G).
Disconnect head lift solenoid wires from EC4
o.
11. Remove the print head ribbon lifter (3356).
12. Push the print head to the rear
0
and insert
straightened paper clips
e
into the holes of both
print head shafts.
13. Pull the print head forward until the print head tip
clears the shafts; push the tip down under the
shaftsG·
14. Remove the paper clips from the shaft holes.
15. Slide the shafts forward to clear the rear print
head mounting holes
O.
Lift up the rear of the
print head; then lift it forward to remove it. Keep
the shaft springs (in the rear mounting holes)
o
for reassembly.
16. Remove the oil wick clip and felt pad
e.
3-56 SY34-0613
, Reimtallation
Lubricate the following with IBM No.6 oil:
• The felt washers on each shaft .
The rear slide points on each shaft.
Also, install the oil wick and felt pad.
0
in the print
head.
1. Place the shaft springs in the print head rear
mounting holes
0;
install the oil wick retaining
clip
e.
on the print head tip.
2. Place the print head front support
G
under the
shafts; slide the print head to the rear so that it is
in the correct position in the yoke. The oil wick
should be between the print head and the yoke.
3. Push the shafts to the rear and insert straightened
paper clips into the holes of both shafts
e.
4. Push the print head forward, permitting the shafts
to press on the springs in the rear mounting holes
0;
raise the front of the print head so that the
tips of the shafts enter the depressions in the front
support. Both shafts must be seated in the front
support of the print head.
5. Remove the paper clips and check for free head
movement front and back.
6. Connect the print head cable to EC3
G).
Connect
the head lift solenoid wires to EC4
o.
7. Reinstall print head ribbon lifter (3356).
8. Reinstall the copy-control dial (3357).
9. Perform steps 2 through 5 of the print head
adjustment.
10. Adjust the ribbon lifter (3356).
11. Reinstall the print head cover and two screws
e.
12. Reinstall the ribbon cartridge (3405).
13. Push the print head on and off the retract ramp to
ensure that the print head retracts correctly.
14. Reinstall the access cover (3051).