Paper Size Detection - Canon LBP1760P Service Manual

CHAPTER 2
B. Paper Size Detection
By setting the cassette in the printer or the optional paper feeder, the specified switches are
actuated. The combinations of actuated switches (Table 2-4-1) detect the paper size and
whether there is a cassette or not.
Paper size
No cassette
Legal
Executive
Letter
OTHER
CUSTOM
B5
A4
As there is no detection mechanism for paper size on the multi-purpose tray, the size of the
paper set on the tray cannot be detected. The paper size in the cassette can be detected by the
switches above. However, when using the universal cassette, the paper size is set by the user.
If the setting made by the user is incorrect, it results in an incorrect detection.
Therefore, this printer has the top of page sensor (PS103) which detects the paper size by
measuring the time from the leading edge passes the sensor until the trailing edge passes the
sensor. If the detected size differs from that specified by the video controller or by the combi-
nation of the switches, the CPU assesses paper size mismatch and reports it to the video con-
troller.
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Table 2-4-1
Paper size detectionswitch
SW600/801 SW601/802
OFF OFF
OFF OFF
OFF ON
OFF ON
ON OFF
ON OFF
ON ON
ON ON
SW602/803
OFF
ON
OFF
ON
OFF
ON
OFF
ON