Sharp AE-X4M30PU Service Manual page 20

AE-X4M30PU
*Remark
The malfunction No. is calculated using the following way.
Example)
Indoor unit lamp
Timer (orange)
Operation (green)
Plasmacluster (blue)
k
Ω
100
80
Heat exchange thermistor
TH2 (Orange), TH3 (Black)
77ºF(25ºC) resistance 4.431 kΩ
60
40
20
0
-10 0
CAUTION: When attaching or removing the board
When operating only the outdoor unit (cooling 40 Hz fixed mode) To make only the outdoor unit run in cooling
mode, and apply a voltage of 230V AC to L1 and L2 on the terminal board and push the pump down switch (SW1).
(Avoid operating the outdoor unit alone for long periods of time.)
from Main PWB
from Main PWB BT11 (Yellow)
→Lamp
Calculation
16 8 4 2 1
O O O O O
O O
O
Figure 1 Temperature properties of indoor thermistors
To measure the resistance, first remove
the soldering as shown at right.
Room temperature
thermistor TH1 (Yellow)
77ºF(25ºC) resistance 10 kΩ
10 20 30 40
from Main PWB BT12 (Blue)
BCN13
from PFC coil
Main Sub
4+1=5 5
2
Thermistor
Signal
Room temperature
TH1
Heat exchange
TH2
Pipe temperature
TH3
ºC
from PFC coil
20
2
Room temperature
Color
thermistor TH1 (CN2 3 - 4 )
Yellow
Heat exchange
Orange
thermistor TH2 (CN2 1 - 2 )
Black
Pipe temperature
thermistor TH3 (CN2 5 - 6 )
CN2
1
Tester
from Main PWB
MRY1 OUT (Black)
from Main PWB T15 (Gray)
6