Detection Timing - Ricoh B064 Service Manual

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The table below lists the sensor output for each paper size.

If an original is on the exposure glass, you can check the sensor output by using

SP4301 (APS Sensor Output Display).

Original Size

1: High (Paper Present), 0: Low (No Paper)

If the original is small (such as A5-LEF), all sensors remain off and the machine

indicates that the original size cannot be detected. However, you can force the

machine to detect A5/HLT in this situation by adjusting SP4303 (APS A5 Size

Detection Timing

When the power is on, the APS sensors are always active, but the CPU checks

their signals only after the platen is lowered.

In the Book mode (when the ADF is open), the CPU checks the APS sensors and

determines the original size after Start ! is pressed.

The CPU checks the APS sensors after the platen is lowered.

By-pass Mode

The APS sensors are ignored when copy paper is fed from the by-pass tray, but

the by-pass tray can handle a variety of sizes and orientations. To accomplish this:

• The machine always assumes short-edge feed for paper on the by-pass tray.

• Width is measured by a sensor inside the by-pass tray.

• The bypass tray cannot measure length, so the registration sensor determines

the length of the paper using clock pulses.

The copy time for the first sheet is slower, because the entire exposure glass area

(or width for the CIS) is scanned. However, when the size of the first sheet has

been detected, scanning is at normal speed for the remaining sheets. (!

Handling Paper> Paper Feed> Paper Size Detection> By-pass Size Detection)

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