Troubleshooting Image Faults; Making Initial Checks; Site Of Installation; Checking The Originals Against Symptoms - Canon iR8500 Service Manual

CHAPTER 6 TROUBLESHOOTING

3 Troubleshooting Image Faults

3.1 Making Initial Checks

3.1.1 Site of Installation

a. The power supply is as rated (±10%), and remains connected throughout day and night.
b. The site is not subject to high temperature/humidity (i.e., near a water faucet, water
boiler, humidifier). It is not cold, near a source of fire, or subject to dust.
c. The site is not subject to ammonium gas.
d. The site is not exposed to the direct rays of the sun; otherwise, curtains are provided.
e. The site is well ventilated.
f. The machine is kept level.
g. The machine remains powered at night.
Check the site against the above requirements.

3.1.2 Checking the Originals Against Symptoms

Find out whether the problem is caused by the machine or the originals.
a. The copy density must normally be set to 5±1.
b. Originals that are reddish in tone may cause poor contrast.
Red sheets, slips.
REF.
c. Checking the Density of the Originals
• Diazo copies or transparent originals may generate copies that can be mis-
taken as being "foggy."
REF.
• Originals prepared in pencil can generate "light" copies.
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COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001