Ricoh DD 4450 Service Manual page 14

Power Plug and Power Cord
Before serving the machine (especially when responding to a service call), always make
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sure that the power plug has been inserted completely into the power source. A partially
inserted plug could lead to heat generation (due to a power surge caused by high
resistance) and cause a fire or other problems.
Always check the power plug and make sure that it is free of dust and lint. Clean it if

necessary. A dirty plug can generate heat which could cause a fire.
Inspect the length of the power cord for cuts or other damage. Replace the power cord if

necessary. A frayed or otherwise damaged power cord can cause a short circuit which
could lead to a fire or personal injury from electrical shock.
Check the length of the power cord between the machine and power supply. Make sure
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the power cord is not coiled or wrapped around any object such as a table leg. Coiling the
power cord can cause excessive heat to build up and could cause a fire.
Make sure that the area around the power source is free of obstacles so the power cord
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can be removed quickly in case of an emergency.
Make sure that the power cord is grounded (earthed) at the power source with the ground
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wire on the plug.
Connect the power cord directly into the power source. Never use an extension cord.
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When you disconnect the power plug from the power source, always pull on the plug, not

the cable.
After Installation, Servicing
Points to Confirm with Operators
At the end of installation or a service call, instruct the user about use of the machine. Emphasize
the following points.
Show operators how to remove jammed paper and troubleshoot other minor problems by

following the procedures described in the operating instructions.
Point out the parts inside the machine that they should never touch or attempt to remove.
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Confirm that operators know how to store and dispose of consumables.
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Make sure that all operators have access to an operating instruction manual for the machine.
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Confirm that operators have read and understand all the safety instructions described in the

operating instructions.
Demonstrate how to turn off the power and disconnect the power plug (by pulling the plug, not

the cord) if any of the following events occur: 1) something has spilled into the product, 2)
service or repair of the product is necessary, 3) the product cover has been damaged.
Caution operators about removing paper fasteners around the machine. They should never

allow paper clips, staples, or any other small metallic objects to fall into the machine.