4511-xxx
2-66 Service Manual
925 Fuser Error
(Incorrect fuser lamp.)
Replace fuser with correct one. See
“Fuser removal” on page 4-28.
927 Fan Error
Fan is stalling.
Replace the fan. See “Fan removal” on
page 4-26.
929 Toner sensor The toner sensor is not operating
properly, the developer drive assembly is
not operating properly, or the print
cartridge is defective. Go to “Sensor Test
(input tray)” on page 3-27.
931 Printhead—no first
HSYNC
Check for unplugged printhead, faulty
cabling, or faulty printhead.
932 Printhead—lost
HSYNC
Replace the printhead.
934 Mirror motor lost lock Replace the printhead.
935 Mirror motor unable to
reach operating speed.
Faulty printhead, cabling or connector.
936 Transport motor initial
lock failure
Indicates a problem with the main drive
motor or a jam occurred during the motor
ramp-up to speed.
937 Transport motor lost
lock
Faulty motor or a jam occurred after
motor ramp-up to speed. Possible
problem with the main drive or motor
cable.
950 Controller card There is a mismatch between the
variables in the EPROM on the operator
panel card and those in the secure
NVRAM on the controller card. This can
only occur after a replacement of one of
the two parts, and the replaced part is
faulty. Replace the controller card or the
operator panel.
Warning: Always replace only one at a
time with a POR between.
951 Controller card The secure NVRAM was not detected on
the controller card. Replace the controller
card.
Service error codes (9xx) (continued)
Error Description Action
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