Chigo CMV-50V9A-S, Service Manual

Page: 40 / 50

Fig. 5
：
the outdoor PCB
Malfunction code
：
F2
（
the indoor temp sensor fault
）
Turn off the power
Take out the temperature sensor from the indoor PCB,
then check whether the indoor temperature sensor’s
resistance
is normal.(the range of normal
resistance :1~40 K
Ω
)
N
Please replace it .when the indoor
temperature sensor has problem.
Y
Connect the sensor renewedly to the indoor PCB,
，
then
check the resistance between the sensor and indoor
PCB terminal. The normal resistance value is 0
Ω
N
The indoor temperature sensor adapter
connector breaks off, pls replace the
indoor PCB or restore the adapter
connector.
Y
The indoor PCB is bad
，
please change it
PTC1 resistance value
：
1
．
02K
Ω（
25
℃）
The limited current
resistance value
：
R54
：
0.76k
Ω
R58
：
2 k
Ω
Faulty cause
：
1
、
maybe
the indoor temp sensor’s
bnc connector plugs is loose or contact ill
;
2 、 the sensor is bad or
the
down-lead is
circuit-break、circuit－short
3、the indoor PCB’s hardware has been damaged
The voltage stabilizing diode
ZD1
、
ZD2 reference value
：
Forward resisitance :713
Ω
reverse
resistance:
∞
Please test the DC motor
end to N terminal voltage
value:
VCC-N +15VDC、 P-N
+340VDC、 Vsp -N 0～+5VDC