Toshiba ESTUDIO170F, Service Manual

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7
January 2005 © TOSHIBA TEC e-STUDIO170F Circuit Description
7 - 77
7.9 OPTIONAL TRAY PBA
This section describes the function of each circuit on the Optional tray PBA.
Fig.7-58
The Optional tray PBA is contained in the optional recording paper tray optionally installed in this
machine. It detects the presence and absence of recording paper in the recording paper tray and relays
the recording paper tray detects sensor output signals and paper pickup solenoid drive signal.
The presence or absence of recording paper in the optional recording paper tray is detected by the
optional paper end sensor. The optional paper end sensor turns on when the actuator of the optional
paper end sensor is pushed down by the recording paper. This allows the 2ND_PAPER_EMPX signal
to go LOW and input to the Engine-CPU (IC37) on the Main PBA to detect that recording paper is
placed in the recording paper tray.
The presence or absence of recording paper tray is detected by the optional tray sensor connected to
CN23. The sensor is pushed down by the projection on the side of the recording paper tray to turn on.
This causes the SIZE20-2 signals to go LOW and input to the Engine-CPU to detect the recording
paper tray placed.
The recording paper placed in the optional recording paper tray is fed by driving the optional paper
pickup solenoid. The Engine-CPU causes the 2ND_PICK_UP_SLX signal to go LOW. This allows the
optional paper pickup solenoid to be driven to transmit power to the pickup roller for feeding the record-
ing paper.
Signal Name Type Active Description Destination
2ND_PAPER_EMPX I L Optional paper detect signal Optional paper
end sensor
SIZE20-2 I L Optional recording paper tray detect sig-
nals 0-2
Optional tray sen-
sor
2ND_PICK_UP_SLX O L Optional paper pickup solenoid drive sig-
nal
IC59
+5V1
Optional
paper end
sensor
2ND_PAPER_EMP
82 5
4
3
R1
+24V3
Optional
paper pickup
solenoid 2ND_PICK_UP_SLX
80 2 2 15
8
1
IC59
PG
IC37
Engine-CPU
Optional
tray
sensor SIZE22
SIZE21
SIZE20
64
65
63
7
8
6
7
8
9
11
12
5
4
6
2
1
2
1
4
3
R233
+5V1
Main PBA Optional tray PBA
CN19 CN21
CN23
CN22