Diagnostic information 2-125
5026
Bubble sensor service check
Step Questions / actions Yes No
1 Is the bubble sensor flag damaged? Replace the fuser. See
“Fuser removal” on
page 4-118.
Go to step 2.
2
Remove the rear frame cover. See “Rear
frame cover removal” on page 4-47.
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?
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 3.
3
Place a voltmeter between the fuser DC
autoconnect, pin 3 and ground (pin 6).
Does the voltage meter read +5 V dc?
Go to step 5. Go to step 4.
4
Place a voltmeter between FUSER1 pin 3 and
ground (pin 6).
Does the meter read +5 V dc?
Replace the system board.
See “System board
removal” on page 4-163.
Go to step 5.
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