Service Manual

65
OCH636B
10-9. TEST POINT DIAGRAM
Outdoor controller circuit board
PUZ-A12NKA7
PUZ-A18NKA7
PUY-A12NKA7
PUY-A18NKA7
PUZ-A12NKA7-BS
PUZ-A18NKA7-BS
PUY-A12NKA7-BS
PUY-A18NKA7-BS
Note: PUZ-A12//18NKA checks solder side.
AC in (L, N)
N L
Communication power supply
D71 Voltage
24 V DC
− +
CNDM
1–2: Input of low-level sound
priority mode
1–3: Input of external contact point
CN51
External signal output
• Compressor operating signal
• Drain hose heater operating signal
CNSW
Connect to switch
board
LEV-A,B
Linear expansion valve
CNF1
Connect to the fan motor
1–4: 250–330 V DC
5–4: 15 V DC
6–4: 0–6.5 V DC
7–4: 15 V DC (When stopped)
7.5 V DC (When operated)
(0–15 V pulse)
TH4
Thermistor <Discharge>
TH3
Thermistor <Liquid>
TH6/7
Thermistor
<2-Phase Pipe/Ambient>
7
6
5
4
1
63H
High pressure switch
CN3
Thermistor <Heat sink>
Connect to compressor
(U, V, W)
Voltage among phases 5–180 V
W
V
U
IPM
P U V W N
N P
Q1
Connect to AC Reactor
21S4
4-way valve
<CAUTION> TEST POINT CNF11 is high voltage.
P N1 L1 N
P
L1
N1
N
Diode (DS2)
Diode (DS1)
Brief Check of POWER MODULE
If they are short-circuited, it means that they are broken.
Measure the resistance in the following points (connectors, etc.).
1. Check of Diode (DS1, DS2)
P -
L1 , P - N1, N - L1 , N - N1
2. Check of Q1
P - N
3. Check of IPM
P - N , P - U , P - V , P - W , N - U , N - V , N - W
P-N keeps being shirt-circuited until the smoothing condenser is
charged by a tester.
Note: The marks, P , N , L ,
L1 , N1 , U , V and W shown in the
diagram are not actually printed on the board.
TH32 Thermistor <Suction>
TH33 Thermistor
<Comp. surface>