User manual

98.05.08.09.00
Color LaserWriter 12/600 PS Troubleshooting 2–7
The printer in validation state is its own best instructional and training
aid. When you first have an operational printer in this state, observe as
much as you can, paying special attention to the following.
Door Switch Before you turn on power, open and close the doors and observe how
the door switch cam assembly works. Only when all three doors are
closed will the door switch be pressed.
Front Door With power still turned off, open the front door and advance the toner
carousel by pressing and turning the green carousel knob. Observe how
the manual rotary assembly meshes with the carousel when you press
the knob and how the toner cartridges remain plumb as you rotate the
carousel.
As you close the door, observe how the door presses against the knob
and elevates the tip of the carousel interlock. Also note the other two
actuators that slide into the chassis. The large one nearer the hinge
opens the laser shutter and the small one on the right strikes a transfer
rod that actuates the door switch.
Main Motor Observe the behavior of the main motor and the three fans. When you
see the main motor spin or fans rotate, you know that power is at least
getting as far as the mechanical controller board.
Carousel Watch and listen as the carousel rotates to check for presence of toner
cartridges. When the calibration tests begin, look between the mechan-
ical controller board and the main fan and observe the bolt action of the
cartridge press drive gear. From the right angle, you can also see the
carousel through the left end of the printer.
Fuser Bulb Observe how the fuser bulb glows during warmup. This glowing
confirms that the fuser bulb circuit is intact.
Solenoids Observe the solenoids as they release press drive into the cleaning brush
and discharge roller. At the end of density calibration, observe how the
cleaning belt drive solenoid behaves like a small piston to advance the
cleaning belt.
Imaging Through the top of the printer, observe the calibration patches being
placed onto the transfer drum, and listen as the cleaning brush is
powered on to clean off the drum. If the startup page prints, notice the
layering of colors as the paper comes to the top of the drum and, finally,
how the separation claw actuates to skim the paper from the drum.