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4.6.2.2 Print Unit (Throat) Interlock
Switch
Service Check
Load program 10 PRT2 to display the status of
the three interlock switches. Set the forms
thickness control on 6. Open and close the print
unit; the display should change accordingly.
Adjust or replace as necessary.
Adjustment
1.
Open the printer cover.
2.
Close the print unit and set forms thick-
ness control on 6.
3.
Loosen the switch mounting screws
rl '
position the switch body to approximately
0.025 inch (0.64 mm) from the print unit
and tighten the screws.
4.
Perform the service check with the forms
thickness control in both the 1 and 6
positions.
Removal
1.
2.
3.
Open the printer cover and disconnect the
switch.
a. If old style switch, disconnect the plug.
b. If new style switch, note color code and
disconnect switch leads.
Remove two screws
D
and the switch
assembly.
Remove two screws
m
and the switch.
Replacement
Replace in reverse order of removal and perform
the print unit interlock switch adjustment
(4.6.2.2).
4.6.2.3 End-of-Forms Interlock Switch
Service Check
Load program 10 PRT2 to display the status of
the three interlock switches. Insert and remove
single-part forms in the forms chute; the display
should change accordingly. Adjust or replace as
necessary.
Adjustment
1.
2.
3.
4.
With forms removed, use a voltmeter on
probe points 13C53 and 13C48 (4.5.6).
Loosen the mounting screws
Ii,
and
position the switch to press the plunger
until the voltage changes from OV to 5V.
Continue moving the switch to allow a
minimum of 0.005 inch (0.13 mm) over-
travel and still not bottom on the switch
body.
Tighten the screws.
Perfom the service check.
Removal
1.
2.
Remove the printer covers (4.6.1) and
unplug the switch cable.
Remove two screws
m
and the switch
assembly.
Replacement
Replace in reverse order of removal and perform
the end-of-forms interlock switch adjustment
(4.6.2.3).
Belt Printer
285 Ipm
4-99
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