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1-4. Other Precautions
• When handling circuit boards, observe the “HANDLING of PWBs”.
• The PC Drum is a very delicate component. Observe the precautions given in “HAN-
DLING OF THE PC DRUM” because mishandling may result in serious image problems.
• Note that replacement of a circuit board may call for readjustments or resetting of partic-
ular items, or software installation.
1-5. Precautions for Service
• When performing inspection and service procedures, observe the following precautions
to prevent mishandling of the machine and its parts.
✽ Depending on the model, some of the precautions given in the following do not apply.
1. Precautions Before Service
• When the user is using a word processor or personal computer from a wall outlet of the
same line, take necessary steps to prevent the circuit breaker from opening due to over-
loads.
• Never disturb the LAN by breaking or making a network connection, altering termination,
installing or removing networking hardware or software, or shutting down networked
devices without the knowledge and express permission of the network administrator or
the shop supervisor.
2. How to Use this Book
DIS/REASSEMBLY, ADJUSTMENT
• To reassemble the product, reverse the order of disassembly unless otherwise specified.
TROUBLESHOOTING
• If a component on a PWB or any other functional unit including a motor is defective, the
text only instructs you to replace the whole PWB or functional unit and does not give trou-
bleshooting procedures applicable within the defective unit.
• All troubleshooting procedures contained herein assume that there are no breaks in the
harnesses and cords and all connectors are plugged into the right positions.
• The procedures preclude possible malfunctions due to noise and other external causes.
3. Precautions for Service
• Keep all disassembled parts in good order and keep tools under control so that none will
be lost or damaged.
• After completing a service job, perform a safety check. Make sure that all parts, wiring
and screws are returned to their original positions.
• Do not pull out the toner hopper while the toner bottle is turning. This could result in a
damaged motor or locking mechanism.
• If the product is to be run with the front door open, make sure that the toner hopper is in
the locked position.
• Do not use an air gun or vacuum cleaner for cleaning the ATDC Sensor and other sen-
sors, as they can cause electrostatic damage. Use a blower brush and cloth. If a unit
containing these sensors is to be cleaned, first remove the sensors from the unit.