Diagnostic information 2-119
7526
920.10—POST—Three toner sensors not connected error service check
Step Questions / actions Yes No
1 1. Turn the printer off.
2. Remove the rear frame cover. See “Rear
frame cover removal” on page 4-37.
3. Reseat the cable in connector JHVPS1.
Did the error clear?
Problem resolved. Go to step 2.
2
Check the HVPS cable in connector JHVPS1
for pinch points and any other damage to the
cable or connector.
Is the cable damaged?
Replace the HVPS cable.
See “High-voltage power
supply (HVPS) cable
removal” on page 4-112.
Go to step 3.
3
1. Remove the left cover. See “Left cover
removal” on page 4-24.
2. Reseat 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?
Go to step 4. Problem resolved.
4
Connect four new toner level sensors outside
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?
Go to step 5. Replace the failing toner
level sensors. See “Toner
level sensor removal” on
page 4-166.
5
Replace the HVPS board. See “High-voltage
power supply (HVPS) removal” on
page 4-110.
Did the error clear?
Problem resolved. Go to step 6.
6
1. Install the old HVPS back to the machine.
2. Replace the HVPS cable. See “High-
voltage power supply (HVPS) cable
removal” on page 4-112.
Does the problem persist?
Replace the system board.
See “System board
removal” on page 4-157
Problem resolved.
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