Humidity Sensor Check; Main Circuit Short Check - Daikin E Series Service Manual

Check

3.14 Humidity Sensor Check

Check No.27 1. Check for proper connection.
2. Check sensor input level (*1).
3. Change ambient conditions (*2) and check that input level changes accordingly.

3.15 Main Circuit Short Check

Check No.29
(–) terminal of the tester
(in case of digital,
(+) terminal)
(+) terminal of the tester
(in case of digital,
(–) terminal)
Resistance in OK
Resistance in NG
212
*1 Input level varies depending on the sensor.
*2 Changes in humidity, temperature, air flow rate. To do this, merely breathe upon.
<Humidity sensor>
S48
Measure the resistance between pins at both ends of DB1.
If the resistance is ∞ or less than 1 kΩ, the main circuit short.
~several MΩ
5V
12V
1
2
Buzzer
3
4
Humidity sensor
5
C70
6
Room temperature thermistor
GND
(~) (+)
(+) (~)
several kΩ
∞
∞
0 or 0
SiBE04-624
(R6023)
(~) (–)
(–) (~)
several kΩ
∞
~several MΩ
∞
0 0 or
Service Diagnosis