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5026
920.12—POST (power-on self test)—One toner sensor not connected error service
check
Step
Questions / actions
Turn the printer off, and then remove the rear
1
frame cover. See
removal" on page
Reseat the cable in connector JHVPS1.
Does the error clear?
Check the HVPS cable in connector JHVPS1
2
for pinch points and any other damage to the
cable or connector.
Is the cable damaged?
Remove the left cover. See
3
removal" on page
Reseat then and check all the toner level
sensor cables (A) connected to the rear of the
HVPS for damages and if they are installed
correctly.
Does the problem persist?
Connect four new toner level sensors outside
4
the machine and perform a POR.
Note: Keep track of which sensors change
the error code to reduce the number of failing
sensors. Keep the old sensor which does not
reduce the failing number, leaving three new
sensors and no error reported.
Does the problem persist?
Replace the HVPS board. See
5
power supply (HVPS) removal" on
page
4-123.
Does the error clear?
1. Install the old HVPS back to the machine.
6
2. Replace the HVPS cable. See
voltage power supply (HVPS) cable
removal" on page 4-125
Does the problem persist?
Service Manual
2-108
"Rear frame cover
4-47.
"Left cover
4-31.
"High-voltage
"High-
Yes
Problem resolved.
Replace the HVPS cable.
See
"High-voltage power
supply (HVPS) cable
removal" on page
4-125.
Go to step 4.
Go to step 5.
Problem resolved.
Replace the system board.
See
"System board
removal" on page
4-163.
No
Go to step 2.
Go to step 3.
Problem resolved.
Replace the failing toner
level sensor. See
"Toner
level sensor removal" on
page
4-171.
Go to step 6.
Problem resolved.
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