72
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.
11-9. TEST POINT DIAGRAM
Outdoor controller circuit board
PUHZ-ZRP35VKA
PUHZ-ZRP50VKA
* PUHZ-ZRP35/50 checks solder side.
AC in (L, N)
L N
Communication power supply
D71 Voltage
24V DC
−
+
CNDM
1
to
2
: Input of low-level sound
priority mode
1
to
3
: Input of external contact
point
CN51
External signal output
• Compressor operating signal
• Abnormal signal
LEV-A,B
Linear expansion valve
CNF1
Connect to the fan motor
1
-
4
: 250-330V DC
5
-
4
: 15V DC
6
-
4
: 0-6.5V DC
7
-
4
: 15V DC (When stopped)
7.5V DC (When operated)
(0V-15V pulse)
TH4
Thermistor
<Discharge>
TH3
Thermistor
<Outdoor pipe>
TH7/6
Thermistor
<Outdoor/2-phase pipe>
TH33
Thermistor
<Outdoor pipe>
TH32
Thermistor <Comp. surface>
7
6
5
4
1
63H
High pressure switch
V
SP
(Voltage between pins of C5A, C5B):
DC 0V (when stopped), DC 1– 6.5V
(when operated)
Connect to compressor
(U, V, W)
Voltage among phases 5-180V
W
V
U
IPM
P U V W N
P N
Q1
Connect to AC Reactor
21S4
Four-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.
P R S N
P
R
S
N
Diode (DS2)
Diode (DS1)
OCH527B