Making Checks In Response To An Image Fault; Checking The Photointerrupters - Canon iR1200 Series Service Manual

*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).

13.1.8 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:
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.
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.

13.1.9 Checking the Photointerrupters

Use 'SENSOR' under 'TEST MODE' in service mode to check photointerrupters as follows:
1) Press the Additional Functions key and the # key to start service mode.
2) Press the Left/Right Arrow key so that 'TEST MODE' is indicated.
3) Press '6' on the keypad so that '6: FACULTY TEST' is indicated.
4) Press '3' on the keypad to start sensor check mode, in which the following screen appears:
5) When the screen shown in the foregoing figure is displayed, press '1', '2', '3', or '4' to bring up the State screen of
a specific sensor. For instance, when '1' is pressed, the following will be true:
6-3:SENSOR
[1] - - - [4]
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