66
Brief Check of POWER MODULE
Usually, they are in a state of being short-circuited if they are broken.
Measure the resistance in the following points (connectors, etc.). If they
are short-circuited, it means that they are broken.
1. Check of Diode (DS1, DS2)
P - R , P - S , N - R , N - S
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.
10-9. TEST POINT DIAGRAM
Outdoor controller circuit board
PUZ-ZM35VKA
PUZ-ZM50VKA
Note: PUZ-ZM35/50 checks solder side.
AC in (L, N)
L
Communication power supply
D71 Voltage
24 V DC
− +
CN51
External signal output
• Compressor operating signal
• Abnormal signal
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>
TH7/6
Thermistor <Ambient/2-phase pipe>
TH33
Thermistor <Comp. surface>
7
6
5
4
1
63H
High pressure switch
V
SP
(Voltage between pins of C5A, C5B):
0 V DC (when stopped),
1–6.5 V DC (when operated)
Connect to compressor
(U, V, W)
Voltage among phases 5–180 V
IPM
P U V W N
P N
Q1
Connect to AC Reactor
21S4
4-way valve
CNMNT
Connect to
M-NET adapter (CN5)
CNVMNT
Connect to
M-NET adapter (CND)
<CAUTION> TEST POINT CNF1
1
is high voltage.
Note: The marks, P , N , R , S , U , V and W shown in the diagram
are not actually printed on the board.
N R S P
P
R
S
N
N
Diode (DS1)
Diode (DS2)
OCH653
