e-STUDIO170F Circuit Description
January 2005 © TOSHIBA TEC
7 - 42
7.3.15
Cover Open Detect Circuit
Fig.7-33
The cover open detect circuit consists of the Engine-CPU (IC37) as the central component. It detects
the open or closed status of the Front cover or RX cover by monitoring the voltage of +24VILS supplied
from LVPS and the output signal of the Exit sensor.
+24VILS delivered from LVPS is supplied or cut off by the Front cover open switch connected to CN3 of
the LVPS and the RX cover open switch connected to CN23 of the Main PBA.
When the cover is closed, each switch is turned ON by each cover plate to deliver the +24VILS power
supply.
When the cover is open, each switch is turned OFF to cut off the power supply of the +24VILS.
Also, the voltage of +24VILS is compared with the standard voltage by the OP amplifier. If +24VILS has
been supplied, ILSW signal is turned to LOW level and the Engine-CPU judges that the Front cover and
RX cover are closed.
When +24VILS is cut off, ILSW signal is turned to HIGH level and the Engine-CPU judges whether any
of the covers are open.
Signal Name
Type
Active
Description
Destination
ILSW
I
L
+24VILS detect signal
IC36
+24V
+24VILS
ILSW
R228
PG
R229
10,11
45
7
5
6
2
10,11
1
IC37
Engine-CPU
Power supply
voltage
generation
circuit
MAIN PBA
Front cover open
switch
CN1
CN3
CN17
2
1
LVPS
RX cover open switch
CN23
+
-
+5V1
R207
IC36
R206
Summary of Contents for ESTUDIO170F
Page 2: ... 2005 TOSHIBA TEC CORPORATION All rights reserved ...
Page 192: ...e STUDIO170F Function Settings January 2005 TOSHIBA TEC 4 132 ...
Page 214: ...e STUDIO170F Mechanical Description January 2005 TOSHIBA TEC 5 22 ...
Page 308: ...e STUDIO170F Circuit Description January 2005 TOSHIBA TEC 7 78 ...
Page 372: ...e STUDIO170F Removal Replacement Adjustment January 2005 TOSHIBA TEC 8 64 ...
Page 490: ...e STUDIO170F Appendix January 2005 TOSHIBA TEC 12 8 ...
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