Paper Size Detect Circuit - Toshiba DP120F Service Manual

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.
Recording paper size
No recording paper tray
Signal Name Type
PS0-2 I
DP120F/DP125F Circuit Description
Fig. 7-3-15
PS0
LT LOW
A4 HIGH
LG HIGH
HIGH
Active
L Paper Size Detect 0-2 Signals
PS1
HIGH
LOW
HIGH
HIGH
Description
7-48
07-03-15
PS2
HIGH
HIGH
LOW
HIGH
Destination
I/OP-2 GA
March 2000 © TOSHIBA TEC