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4.2.2 Interlock Switch Description
CAUTION
Do not use meter on resistance scale. Damage
to switch might result.
The interlock switches are electronic switches
consisting of a module
m,
a magnet
g ,
a
spring
Ii,
and a plunger
m .
The switch
assembly has no contacts. When the plunger is
pushed in, the magnet passes over the module
and switches the signal level to 0 volts. A spring
within the mechanism returns the plunger to
the extended position.
Note:
Two styles of switches are available; both
are electronic switches.
4.2.2.1 Cover I nterlock Switch
A cover interlock switch disable mechanism
allows the printer to be serviced when the covers
are open . To operate the switch with the covers
open, push the armature
D
toward the switch
body; then insert a small screwdriver at point
D
to compress the spring. A magnet within
the switch assembly attracts the armature and
keeps the switch activated. When the cover is
closed, a block on the cover presses against
the plunger and deactivates the disable mechanism.
Service Check
Load program 10 PRT2. This displays the
status of the three interlock switches. Open
and close the cover; the display should change
accordingly. Adjust or replace as necessary.
I
DANGER
After performing the service check, operate the
interlock override. Ensure that closing the
cover will reset the interlock override.
Adjustment
1.
Loosen the switch assembly mounting
screws
13
slightly and slide the assembly
back and forth until the switch transfers
between 1 inch (25.4 mm) and 2 inches
(50.8 mm) from the closed position.
2.
Note:
When the switch is adjusted properly,
the display indicates cover open and cover
closed within that inchm.
Tighten screws
13.
Cover Interllock Switch (Continued)
Removal
1.
2.
3.
Open the printer cover and unplug the
switch (:able:
a. If old style, pull the plug.
b. If new style, observe the color code and
disconnect the wires.
RemOVE! two screws
13
and the switch
assembly
m .
RemOVE! two screws
iii .
Note:
If switch is new style, skip step 4 and
do step 5.
4.
RemOVE! clip
II
and pin
01 .
5.
RemOVE! the switch.
Replacement
Install in revel'se order of removal and perform
the cover interlock switch adjustment (4.2.2.1)
Switch Assembly
II
Old Style Switch Assembly
Interlock Switch
m
Display indicates
open and/or
closed within
this 1 inch
(25.4 mm)
Printer
Cover
I
~Ip....-.I------' -~
~---..-=-==~---
--:1-
4-18
Machine Cover
1 inch
2 inches
(50.8mm)
Armature
(25.4 mm)
New Style Switch Assembly
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