Making Checks In Response To An Image Fault; Checking The Originals Against The Symptom; Copyboard Glass And White Sheet - Canon SmartBase 1270D Service Manual

CHAPTER 7 TROUBLESHOOTING
*1: When executing test printing, be sure to select the source of paper used by the user
when the fault occurred.
*2: For malfunctions related to the ADF, see the descriptions of faults unique to machines
equipped with ADF functions. Likewise, if a malfunction occurs while printing from a
PC or a fax communication, see its respective section (those unique to printer functions
or those unique to fax functions).

2.3 Making Checks in Response to an Image Fault

When you have indicated an image fault using the troubleshooting flow chart, go through
the following before starting troubleshooting work that follows:

2.3.1 Checking the Originals Against the Symptom

Determine whether the fault is caused by the machine or the original:
a. The copy density is best set to index 5 ± 2.
b. Originals with a bluish background tend to cause poor contrast; e.g., blue sheet, receipts.
c. The density of the original affects its copies: e.g., a diazo copy original or an original
with a high transparency can produce output that can be mistaken for "foggy copies,"
while originals prepared in light pencil can produce output that can be mistaken for
"light" copies.

2.3.2 Copyboard Glass and White Sheet

If the copyboard glass or the white sheet is soiled, wipe it with a moist cloth and then dry
wipe it. If the dirt is excessive, use alcohol and lint-free paper. If there are scratches, replace
it.
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COPYRIGHT © 2002 CANON INC. 2000 2000 2000 2000 CANON SmartBase PC1210D/1230D/1270D REV. 1 MAR. 2002