User manual

98.05.08.09.00
Color LaserWriter 12/600 PS Troubleshooting 2–18
If the connectors are secure, remove the fuser assembly and measure
continuity between pins 1 and 2 and then between pins 3 and 4 on the
fuser assembly.
A lack of continuity at either point indicates that the fuser heater
circuitry is broken, in which case you should replace the fuser
assembly. If continuity is confirmed, replace the power supply.
Note 5 The DC controller has detected that oil-overflow sensor PS10 is
returning low. This is consistent with a condition, in which the oil in
the overflow pan floats the actuator upward into the photo-interrupter.
Note : If your printer persists in this problem, order the level and shim
kit (P/N 076-0622) to assure that the printer is properly levelled. For
more information, see “Ov
erview” in the “CLW 12/660” chapter.
On site, if the printer has just been serviced and has exhibited this error
ever since, immediately check connector J2009 on the mechanical
controller board. Disconnect J2009, remove it from the cable guides
along the top of the board, and then reconnect it. Test the printer.
If the printer has just been moved or tilted, the problem might be that
oil has contaminated the sensor. Replace the photo-interrupter (P/N
922-1353) and test the printer.
If the problem persists, open the fuser access door and lower the fuser
delivery roller. The actuator for PS10 rises through the “floor” on the
delivery side of the fuser roller. If you have a dental mirror, you can
place it against the lower fuser roller and get an unobstructed view of
the actuator and photo-interrupter. The movie to the left shows how to
position the mirror.
J21-2
J21-4
J21-1
J21-3
Receptacle connector on
back of fuser assembly
(removed from printer)
Movie
Photo-Interrupter
Lower Fuser Roller
Actuator
Oil-Overflow Sensor PS10