Toshiba e-studio555 - Temperature;Humidity Detection Circuit; Outline; Construction

e-STUDIO555/655/755/855 © 2009 - 2011 TOSHIBA TEC CORPORATION All rights reserved
PROCESS RELATED SECTION
9 - 8
9.6 Temperature/humidity detection circuit
9.6.1 Outline
The temperature/humidity detection circuit detects the temperature and humidity inside of the
equipment by means of the corresponding sensor so that the printing quality is not changed due to their
adverse influence where the equipment is set up, and corrects the output of the auto-toner sensor or
similar according to the result.
9.6.2 Construction
The temperature/humidity detection circuit is composed as shown in the figure below. It converts the
voltage of each analog signal output from the temperature/humidity sensor into a digital signal by
means of the A/D converter embedded in the main CPU on the LGC board. The higher the temperature
is, the lower the voltage of the temperature detection signal becomes. The higher the humidity is, the
higher the voltage of the humidity detection signal becomes.
Fig. 9-5
Signal Function Low level High level
THSCH-1 Temperature/humidity switch signal Temperature
detection
Humidity
detection
TEMPS-1A Temperature detection signal (analog) - -
HUMIS-1A Humidity detection signal (analog) - -
0
1
+5VB
SG
SG
SGSG
+5VB
-
+
IC12
IC24
LGC board
Control panel
Temperature/
humidity sensor
TEMPS-1/
HUMIS-1
THSCH-1
TEMPS-1A
HUMIS-1A
IC58
Main CPU
R
TH
(Temp)
V
RHV
(Hum)