Bubble Sensor Service Check - Lexmark C746n Service Manual

Bubble sensor service check

Step Questions / actions
Is the bubble sensor flag damaged?
1
Remove the rear frame cover. See
2
frame cover removal" on page
Check the fuser DC cable in connector
JFUSER1 for proper connection to the system
board, pinch points, and any other damage to
the cable or connector.
Is the cable damaged?
Place a voltmeter between the fuser DC
3
autoconnect, pin 3 and ground (pin 6).
Does the voltage meter read +5 V dc?
Place a voltmeter between FUSER1 pin 3 and
4
ground (pin 6).
Does the meter read +5 V dc?
"Rear
4-47.
Pin 3 Pin 6 (ground)
Yes
Replace the fuser. See
"Fuser removal" on
page 4-118.
Replace the fuser DC
cable. See
"Fuser DC
cable removal" on
page 4-121.
Note: Make sure to verify if
the new cable is working
properly first. Route the
cables properly only when
you have verified that the
cables are working
properly.
Go to step 5.
Replace the system board.
See
"System board
removal" on page 4-163.
5026
No
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Diagnostic information
2-125
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