Check Yes No
Step 4
a Remove the image unit and waste toner bottle.
b Replace the right cover and close the front door.
c Enter the Diagnostics Menu, and run the appropriate cartridge drive
motor test for the missing color.
d Select MISC TESTS in the Diag menu, and press Select.
e Select Motor Detect. Remove Cartridge. appears.
f Remove all toner cartridges and the imaging unit.
g Close the front cover. If you press Select before closing the front cover,
then a message appears: Close cover. Press Select.
h Press Select. Motor Detection In Progress... appears.
The motor detection process takes about 10 seconds, and stops
automatically. Detect Complete. Rebooting... appears,
and the printer performs a POR (Power On Reset).
Did the motor run?
Go to step 5. Replace the main drive
gear assembly. See
Main drive gear
assembly with motor
removal.
Step 5
Remove the developer unit. See Developer unit removal. Check the
developer cartridge contacts from the HVPS to the IU.
Are all the toner cartridge contacts clean on both the Pin and IU?
Go to step 6.. Clean the developer
cartridge contacts. See
Developer unit
removal.
Step 6
Are all the spring‑loaded Pins in the HVPS free to move in and out with an
equal amount of spring force.
Go to step 7. Replace the HVPS. See
High‑voltage power
supply (HVPS)
assembly removal.
Step 7
Turn the printer off, and remove the rear cover. See “Rear cover removal”
on page 221. Check the continuity between the spring‑loaded Pin and
the JSC1 connector on the lower left side of the controller board.
Are all conductors continuous?
Go to step 8. Replace the cable.
Step 8
Replace the printhead. See Printhead removal.
Did this fix the problem?
Problem resolved. Replace the controller
board. See Controller
board removal.
Print quality blurred or fuzzy print service check
Run the automatic alignment. The TPS sensor may be damaged. To run Reset Color Cal:
1 Enter the Diagnostics Menu.
Turn the printer off, and press and hold 3 and 6.
2 Select Reset Color Cal, and press Select.
7527
Diagnostic information
32
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