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COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
10–25
III. IMAGE FAULTS
A. Initial Checks
1. Checking the Site Environment
a. The power outlet must be exclusive, and must provide the rated voltage. (The power plug
must remain connected throughout day and night.)
b. The copier must not be installed in a high-temperature/-humidity environment (near a water
faucet, water boiler, humidifier), near a source of fire, or in a dusty area.
c. The copier must not be subjected to ammonium gas.
d. The copier must be kept away from direct sunshine. As necessary, provide curtains.
e. The site must be well ventilated.
f. The copier must be kept level.
g. The copier must remain powered throughout day and night.
Check to make sure that all above conditions are met.
2. Checking the Originals
Identify the problem as to its cause—original page or the copier.
a. As a rule, the Copy Density adjusting lever must be at the median graduations, and ‘U12:
density correction’ in user mode must be set to ‘0’.
b. Original pages with a reddish background can cause poor contrast.
EX. Slips (invoices) made on reddish paper.
c. Diazo copies and original pages with a high transparency can produce copies mistakenly
identified as “foggy” copies. Original pages prepared in light pencil, on the other hand, can
produce copies mistakenly identified as “light” copies.
3. Checking the Copyboard Cover and Copyboard Glass
If soiled, clean it using a solution of mild detergent or alcohol. If scratches are found, replace it.