User manual

98.05.08.09.00
Color LaserWriter 12/600 PS Troubleshooting 2–19
If you do not have a mirror, you can remove the two screws and the
black trim piece above the fuser roller opening to get a partial direct
view of the actuator. The movie to the left is taken from this view, and
shows an actuator in the up position being pressed with the tip of a
jeweller’s screwdriver.
If the flag is up, then oil is filling the pan. Replace the fuser assembly.
Make sure to extract oil from both the reservoir and the well before
returning the fuser to Apple (see “Fuser Oil Extraction” in Take Apart).
If the flag is not up, then the problem is somewhere between the photo-
interrupter and the DC controller. Replace the fuser assembly. If the
problem persists, reinstall the customer’s fuser assembly and replace
the fuser interconnect cable.
Note 6
The DC controller has detected an error in the temperature/humidity
sensor circuit. On site, check the transit coupling into which the temper-
ature/humidity cable connects (see step 1 of the “Toner Release
Assembly” topic in the Take Apart chapter), and check the connection
at J2005 on the mechanical controller board. Test the printer.
If the problem persists, replace the temperature/humidity sensor.
Note
: In rare instances, a faulty temperature/humidity cable or rear DC
controller harness cable could also return this error.
Note 7
The DC controller has detected an error in the cassette pickup circuit.
On site, check to make sure that the cassette pickup assembly mates
firmly into the receptacle connector. Check the connection at J2002 on
the mechanical controller board. Test the printer.
If the problem persists, replace the cassette pickup board and test the
printer. If the problem persists, replace the cassette pickup assembly.
Note
: In rare instances, a faulty rear DC controller harness cable could
also return this error.
Note 8
The DC controller has detected an error in the calibration density
sensor circuit. On site, check to make sure that the black arm at the end
of the density sensing assembly is correctly attached to the top access
door, and that there is nothing keeping the assembly from pivoting
down and resting above the transfer drum. Check the ribbon cable
connection at J103 on the DC controller board and at its opposite end
on the sensing assembly.
If the problem persists, replace the density sensing assembly.
Note 9
Replace the DC controller board (P/N 661-0898).
Movie