Mitsubishi Electric PLA-SM71EA2 Service Manual page 28

9-7. TEST POINT DIAGRAM
Indoor controller board
LED2
Power supply
(Wired remote controller)
LED3
Communication
(Indoor-outdoor)
CN51
Centrally control
– : Control signal
13 V DC pulse input ( : +)
– : Operation indicator
13 V DC ( : +)
– : Malfunction indicator
13 V DC ( : +)
CN41
HA terminal-A
CN2L
Lossnay
CN105
IT Terminal
CN20
Room temperature thermistor
(TH1)
CN44
Pipe temperature thermistor
– : Liquid (TH2)
– : Condenser/evaporator (TH5)
CN4F
Drain float switch (FS)
CNP
Drain pump (DP)
– : 13 V DC
Vsp
Voltage between pins of C626
0 V DC (FAN stop)
1–6.5 V DC (FAN operation)
(Same as 6(+)–4(−) of CNMF)
CNMF
Fan motor (MF)
– : 310–340 V DC
– : 15 V DC
OCH784
CNV
Vane motor (MV)
12 V pulse output
28
TB5
Connect to wired remote controller
10.4–14.6 V DC
CN90
Connect to the wireless
remote controller board (CNB)
SW1
Model selection
J41, J42
Jumper wire
(Pair No. setting with
wireless remote controller)
SW2
Capacity setting
SWE
Jumper switch
(Emergency operation)
CN32
Remote switch
CN4G
Connect to the auto grille controller
board (CN4G) or 3D Total Flow
controller board (CN5A)
– : 13 V DC ( : +)
– , – : communication line
0-5 V DC ( , : +)
LED1
Power supply (I.B)
CN3C
Connect to the terminal block
(TB4)
(Indoor/outdoor connecting line)
0–28 V DC (Communication)
CN01
Connect to the terminal block
(TB4)
(Indoor/outdoor connecting line)
– : 220–240 V AC
F1
Fuse
(6.3A/250 V)