Toshiba DP120F, Service Manual

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March 2000 © TOSHIBA TEC 7-109 DP120F/DP125F Circuit Description
The correspondence between the respective signal levels and optional recording paper tray
statuses is shown in the table below.
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.
Status STA3 STA2 STA1
No recording paper tray LOW LOW LOW
Recording paper empty LOW LOW HIGH
Recording paper size LT LOW HIGH LOW
Response signal LOW HIGH HIGH
Recording paper size A4 HIGH LOW LOW
Undefined HIGH LOW HIGH
Recording paper size LG HIGH HIGH LOW
Optional recording paper tray uninstalled HIGH HIGH HIGH
and reset state
Recording paper size PS0 PS1 PS2
LG LOW HIGH HIGH
LT HIGH LOW HIGH
A4 HIGH HIGH LOW
No recording paper tray HIGH HIGH HIGH