Toshiba E-STUDIO520 - Temperature;Humidity Detection Circuit; Outline; Construction

e-STUDIO520/600/720/850 PROCESS RELATED SECTION March 2005 © TOSHIBA TEC
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10.6 Temperature/humidity detection circuit
10.6.1 Outline
The temperature/humidity detection circuit detects the temperature and humidity inside of the equip-
ment 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.
10.6.2 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 voltage of each analog
signal output from the temperature/humidity sensor becomes higher when the temperature or humidity
is.
Fig.10-5
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
+5.1VC
SG
SG
SGSG
+5.1VC
-
+
IC12
IC24
LGC board
Control panel
DSP board
Temperature/
humidity sensor
KEY1 board
TEMPS-1/
HUMIS-1
THSCH-1
TEMPS-1A
HUMIS-1A
IC58
Main CPU
R
TH
(Temp)
VRHV
(Hum)