Lexmark 5021-0XX - Manual (Page 153)

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.