Toshiba DP120F, Service Manual

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DP120F/DP125F Circuit Description 7-48 March 2000 © TOSHIBA TEC
3.15 Paper Size Detect Circuit
The paper size detect circuit consists of the I/OP-2 GA (IC48) and other peripheral devices. It
detects the presence or absence of a recording paper tray and the size of recording paper
placed in the recording paper tray through paper size sensors 0-2 connected to CN16 on the
Mother PBA.
One of paper size sensors 0-2 is pushed down by the paper guide of the recording paper tray
and turns on. This causes the corresponding one of the PS0-2 signals to be LOW and input to
the I/OP-2 GA to detect the recording paper size. When no paper guide is installed, the ab-
sence of a recording paper tray will be detected.
The signal levels and the detection conditions of recording paper sizes are listed in the table
below.
Fig. 7-3-15
07-03-15
Signal Name Type Active Description Destination
PS0-2 I L Paper Size Detect 0-2 Signals I/OP-2 GA
Recording paper size PS0 PS1 PS2
LT LOW HIGH HIGH
A4 HIGH LOW HIGH
LG HIGH HIGH LOW
No recording paper tray HIGH HIGH HIGH