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The correspondence between the respective signal levels and optional recording paper tray
statuses is shown in the table below.
No recording paper tray
Recording paper empty
Recording paper size LT
Response signal
Recording paper size A4
Undefined
Recording paper size LG
Optional recording paper tray uninstalled
and reset state
The presence or absence of paper placed in the optional recording paper tray is detected by the
optional paper empty sensor connected to CN5. The recording paper, if present, pushes down
the actuator of the optional paper empty sensor for turning on. This causes the PE signal to be
LOW and input to the Optional tray MPU to detect the presence of recording paper.
The size of recording paper placed in the optional recording paper tray is detected by the
optional paper size sensors (0-2) connected to CN6. The paper guide of the tray pushes down
the optional paper size sensor(s) 0-2 for turning on. This causes the PS0-2 signals to be LOW
or HIGH to detect the recording paper size input to the Optional tray MPU. If no paper guide is
mounted, the absence of a recording paper tray will be detected.
The respective signal levels and recording paper size detect conditions are listed in the table
below.
Recording paper size
No recording paper tray
March 2000 © TOSHIBA TEC
Status
PS0
LG
LOW
LT
HIGH
A4
HIGH
HIGH
STA3
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
PS1
HIGH
LOW
HIGH
HIGH
7-109
STA2
STA1
LOW
LOW
LOW
HIGH
HIGH
LOW
HIGH
HIGH
LOW
LOW
LOW
HIGH
HIGH
LOW
HIGH
HIGH
PS2
HIGH
HIGH
LOW
HIGH
DP120F/DP125F Circuit Description
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