Ricoh A229 Service Manual page 73

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Table of Contents

Original Size

LT/DLT Version

" x 14" (8" x 13")

-L: Lengthwise, -S: Sideways, O: Paper Present, X: Paper Absent

The original size data is taken by the main CPU when the DF position sensor [A] is

activated. This is when the DF is positioned about 15 cm above the exposure

glass. At this time, only the sensor(s) located underneath the original receive the

reflected light and switch on. The other sensor(s) are off. The main CPU can

recognize the original size from the on/off signals from the five sensors.

If the copy is made with the platen open, the main CPU decides the original size

from the sensor outputs when the Start key is pressed.

The above table shows the outputs of the sensors for each original size. This

original size detection method eliminates the necessity for a pre-scan and

increases the machine's productivity. However, if the by-pass feeder is used, note

that the machine assumes that the copy paper is lengthwise. For example, if A4

sideways paper is placed on the by-pass tray, the machine thinks it is A3 paper

and scans the full A3 area, disregarding the original size sensors. However, for

each page, the data signal to the laser diode is stopped to match the copy paper

length detected by the registration sensor. This means that copy time for the first

page may be slower (because of the longer time required for scanning), but it will

be normal for the rest of the job.

Width Sensor

Troubleshooting