Mitsubishi Electric MXZ-8B140VA Technical & Service Manual page 38

8-7. TEST POINT DIAGRAM
8-7-1. Outdoor controller circuit board
MXZ-8B140VA MXZ-8B140YA MXZ-8B160VA MXZ-8B160YA
SW1
SW7
Forced defrost,
detect history record reset
SW6
Model select
SW4
Test operation
SW5
Function switch
SW8
LED
63L
Low pressure switch
63HS
High pressure sensor
TH4
Thermistor
<Compressor>
TH3
Thermistor
<Outdoor pipe>
TH7/6
Thermistor
<Outdoor 2-phase pipe>
63H
High pressure switch
V
FG
(Voltage between
right pins of PC5C
and PC5D, pin 3
and pin 4)
(Same as
7 4
(CNF1 (+)- (-))
V
SP
(Voltage between pins
of C5A, C5B): DC 0V
(when stopped), DC 1–
CNF1, CNF2
6.5V
Connect to the fan motor
(when operated)
1-4: 250-330V DC
5-4: 15V DC
6-4: 0-6.5V DC
7-4: 15V DC (When stopped)
OCH480A
CNDM
1 to 2: Input of low-level sound priority mode
1 to 3: Input of external contact point
SW9 SW2
CN3S
7.5V DC (When operated)
(0V-15V pulse)
CNDC
+ -
250-330V DC
Communication power supply
(1+, 3-)
D71 Voltage
(Outdoor power circuit
24V DC
board for VA)
(Noise filter circuit board
for YA)
38
<CAUTION> TEST POINT 1 is high voltage.
CN51
CN52C
Connect to the noise fil-
ter circuit board (CN52C)
(MXZ-8B140/160VA)
CN4
Transmission to out-
door power circuit
board (CN4)
SV1
Solenoid valve 1
SV2
Solenoid valve 2
21S4
Four-way valve
CN2
Connect to the outdoor
power circuit board (CN2)
1-5: Reception from
2-5: Zero cross signal
3,4: Not used
6-5: 16V DC
7-5: 16V DC
CNAC
2 to 4: Power supply for
outdoor controller circuit
board (220V-240V AC)
1 to 3: Power supply for
indoor and outdoor unit
connection wire
(220-240V AC)
CNS
S1-S2: 220-240V AC
(Branch box/outdoor
unit connecting wire)
power circuit board
(0-5V DC)