End-Of-Forms Switch; Service Check; Adjustment; Removal And Replacement - IBM 5256-1 Maintenance Information Manual

130
END-Of-fORMS SWITCH
Service Check
1. Set your CE meter to the R x 1 scale.
2.
3.
Connect the meter wires to the normally open
(N/O) and the common (C) terminals of the
switch
II.
Insert a 0.076 mm (0.030 inch) thickness gauge
between the top of the actuator lever and the
bottom of the platen groove. The meter should
show that the switch has operated.
Note: The gauge must be held horizontal and not
inserted too far or the indication will not be
correct.
4. Check (by operating the Paper-Release lever
several times) that the override arm operates the
End-of-Forms switch.
5. Adjust if needed.
Adjustment
1. Power off.
2. Remove the printer covers (110).
3. . Remove the forms tractor unit.
4. Remove the paper deflector and install the platen.
5.
6.
7.
8.
9.
Pull the Paper-Release lever toward the platen and
leave it there.
Check that the switch actuator lever is centered in
the platen groove
II.
If it is not centered, loosen
the switch assembly mounting screw
II
and place
the switch assembly in position again. Fasten the
screw tightly.
Set your CE meter to the R x 1 scale.
Connect the CE meter leads to the normally open
(N /0) and the common (C) terminals of the
switch
II.
Loosen the 2 switch mount holding screws
0,
and move the switch mount
II
toward the front of
the printer.
1-30
10. Insert a 0.076 mm (0.030 inch) thickness gauge
between the top of the actuator lever and the
bottom of the platen groove. Slowly push the
switch mount toward the rear until the meter
indicates that the switch has operated.
Note: The gauge must be held horizontal and not
inserted too far or the adjustment will not be
correct.
11. Tighten the screws
0
and check the adjustment.
12. Remove the platen.
13. Reinstall the paper deflector and the platen.
14. Operate the Paper-Release lever several times to
check that the override arm operates the
End-of- Forms switch. If the switch operates, skip
steps a
through~.
If the switch does not operate:
a. Move the Paper-Release lever backward.
b. Place 0.30 mm to 0.50 mm (0.012 inch to
0.020 inch) of paper between the platen and
actuator lever
B.
c. Loosen the setscrew
II
and move the override
arm
II
so that the end of the arm touches, but
does "lOt. move, the End-of-Forms switch
actuator lever
B.
d. Tighten the setscrew.
e. Check the adjustment.
15. Reinstall the printer covers (110).
Removal and Replacement
1. Power off.
2.
3.
4.
5.
6.
7.
Remove the printer covers (110).
Remove the End-of-Forms switch assembly by
removing the screw and the lockwasher
II.
Remove the switch from the assembly by
removing the 2 screws
II.
Move the switch leads from the old switch to the
new switch (N/C and C)
II.
Install the new switch on the assembly and install
the assembly on the printer.
Adjust the switch.