Temperature/Humidity Detection Circuit; Outline; Construction - Toshiba e-STUDIO520 Service Manual

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.
Control panel
Temperature/
humidity sensor
R
TH
(Temp)
V
RHV
(Hum)
Signal
THSCH-1 Temperature/humidity switch signal
TEMPS-1A Temperature detection signal (analog)
HUMIS-1A Humidity detection signal (analog)
e-STUDIO520/600/720/850 PROCESS RELATED SECTION
KEY1 board DSP board
Function
LGC board
+5.1VC +5.1VC
TEMPS-1A
SG
SG
HUMIS-1A
+
-
IC12
SG SG
Fig.10-5
Low level
Temperature
detection
-
-
10 - 8
THSCH-1
TEMPS-1/
0
IC58
HUMIS-1
Main CPU
1
IC24
High level
Humidity
detection
-
-
March 2005 © TOSHIBA TEC