Image Faults; Initial Checks; Checking The Site Environment; Checking The Originals - Canon NP6251 Service Manual

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CHAPTER 11 TROUBLESHOOTING

III. IMAGE FAULTS

A. Initial Checks

Make sure of the following:

a. The voltage of the power source is the rating ±10%. (The power plug must not be

disconnected at night.)

b. The machine is not near areas of high temperature/humidity (near water faucets,

water boilers, humidifiers, and sources of fire), and it is not in a cold or dusty place.

c. The machine is not in a place exposed to ammonium gas.

d. The machine is not exposed to direct rays of the sun. (Otherwise, provide curtains.)

e. The room is well ventilated.

The machine is kept level.

Check the originals to find out whether the problem is caused by the type of original

or the machine.

a. The copy density lever is best set to scale 5 ±1.

b. Originals with a reddish background may not provide good contrast (red sheets,

slips, etc.).

c. The density of originals at times affect the copy quality:

• If the original is a diazo copy or has an appreciable transparency, copies can be

mistaken for "foggy" copies.

• If the original is made in light pencil, the copies can be mistaken for "light" copies.

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CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)

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