Ricoh DD 4450 Service Manual page 12

Power
Always disconnect the power plug before doing any maintenance procedure. After

switching off the machine, power is still supplied to the main machine and other devices.
To prevent electrical shock, switch the machine off, wait for a few seconds, then unplug
the machine from the power source.
Before you do any checks or adjustments after turning the machine off, work carefully to

avoid injury. After removing covers or opening the machine to do checks or adjustments,
never touch electrical components or moving parts (gears, timing belts, etc.).
After turning the machine on with any cover removed, keep your hands away from
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electrical components and moving parts. Never touch the cover of the fusing unit, gears,
timing belts, etc.
Installation, Disassembly and Adjustments
After installation, maintenance, or adjustment, always check the operation of the machine
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to make sure that it is operating normally. This ensures that all shipping materials,
protective materials, wires and tags, metal brackets, etc., removed for installation, have
been removed and that no tools remain inside the machine. This also ensures that all
release interlock switches have been restored to normal operation.
Never use your fingers to check moving parts causing spurious noise. Never use your

fingers to lubricate moving parts while the machine is operating.
Special Tools
Use only standard tools approved for machine maintenance.
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For special adjustments, use only the special tools and lubricants described in the service

manual. Using tools incorrectly, or using tools that could damage parts, could damage the
machine or cause injuries.