A SERVICE OF

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Diagnostic information 2-75
5021-0XX
Cover open service check
Step Questions / actions Yes No
1 Turn printer off and remove
right cover. See Right
cover removal on
page 4-22. Check all
interlock switch (top, rear
and front) actuators for
proper operation. Are
actuators good?
Go to step 2. Replace
appropriate
actuator:
Front cover for
front cover
interlock switch.
See Front
cover assembly
removal on
page 4-19.
Top cover
assembly for top
cover interlock
switch. See
Top cover
assembly
removal on
page 4-18.
Rear cover
actuator for rear
cover interlock
switch. Actuator
is contained in
parts packet.
2 Check each interlock
switches (top, rear and
front) for proper operation
and damage. Listen for
switching action. Using an
ohmmeter, check switches.
When switch is open (cover
open), resistance between
pin 1 and pin 3 is 0 and pin
1 and 2 is infinite. Closing
switch will show 0
resistance between pins 1
and 2 and infinite
resistance between pins 1
and 3. Are switches good?
Go to step 3. Replace switch
in question. See
Front door
interlock switch
removal on
page 4-29 for
front interlock
switch, see
Power supply
fan removal on
page 4-74 for
rear and top
interlock
switches.