Mitsubishi Electric Mr. Slim PUHZ-ZRP35VKA Service Manual page 73

11-9. TEST POINT DIAGRAM
Outdoor controller circuit board
PUHZ-ZRP35VKA
PUHZ-ZRP35VKAR1
PUHZ-ZRP35VKAR1-ER
PUHZ-ZRP35VKAR1-ET
PUHZ-ZRP50VKA
PUHZ-ZRP50VKAR1
PUHZ-ZRP50VKAR1-ER
PUHZ-ZRP50VKAR1-ET
Note: PUHZ-ZRP35/50 checks solder side.
AC in (L, N)
L N
CNVMNT
Connect to
M-NET adapter (CND)
21S4
4-way valve
CNMNT
Connect to
M-NET adapter (CN5)
Connect to AC Reactor
P
R
Diode (DS1)
S
N
P R S N
Diode (DS2)
OCH527C
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.
Note: T he marks, P , N , R , S , U , V and W shown in the diagram
are not actually printed on the board.
Communication power supply
D71 Voltage
24 V DC
− +
P N P U V W N
Q1 IPM
73
<CAUTION> TEST POINT CNF11 is high voltage.
CNDM
1–2: I nput of low-level sound
priority mode
1–3: I nput of external contact point
CN51
External signal output
• Compressor operating signal
• Abnormal signal
LEV-A,B
Linear expansion valve
TH4
Thermistor
<Discharge>
TH3
Thermistor
<Outdoor pipe>
TH7/6
Thermistor
<Outdoor/2-phase pipe>
TH32
Thermistor <Comp. surface>
TH33
Thermistor
<Outdoor pipe>
CNF1
Connect to the fan motor
7
1–4: 250–330 V DC
6
5–4: 15 V DC
5
6–4: 0–6.5 V DC
4
7–4: 15 V DC (When stopped)
7.5 V DC (When operated)
1
(0–15 V pulse)
V
SP
(Voltage between pins of C5A, C5B):
0 V DC (when stopped),
1–6.5 V DC (when operated)
63H
High pressure switch
Connect to compressor
W
(U, V, W)
V
Voltage among phases 5–180 V
U