Midea MCH2U-18PHH2 Service Manual page 27

PCB board of MCH2U-18PHH2, MCH3U-27PHH2
LED1
status light, by which you can judge the unit Normal or Error
(standby) Flashing once per second(low speed flashing)
(error) Flashing once per half second (high speed flashing)
(running) aways on
Low VOL supply
connect to IPM BOARD CN1
(+4)-(-3) +5VDC Pulse wave
(+5)-(-3) +5VDC Pulse wave
connect to detector
connect to DR module
CN17
room temp sensor RT
pipe temp sensor RT
CN7
Exaust temp sensor RT
CN15
NO USE
CN28
NO USE
CN14
NO USE
CN12
connect to the comperssor top temp. sensor
0V DC
NO USE
L-OUT connect to IPM BOARD CN4
(L-OUT)-(N-OUT) 208-230V AC
connect to IPM BOARD CN5
N-OUT
(L-OUT)-(N-OUT) 208-230V AC
CN33 connect to DR module RED wire
CN32 connect to DR module BLUE wire
(L-OUT)-(N-OUT) 208-230V AC
CN21
CN24 CN22
NO USE NO USE
CN27
NO USE
CN26
D C
test port
or
CN24 CN22
CN19
C62
IC17
IC1 IC6
CN17
T3/T4
R31 R38
R39
R6 D5
E2
R34 E9
E11
E8 C24
E10
D13 D15 PAI QI
R5 R83
CN7
R16 R102 CN21
E4 C71
E6 E7 IC15
E5
TO-DRIVE R88
C73 R77 Q4
RUN
CN26 LED1
C54
CN27
D7 D8 D11 R120
TestPort
R86
R99
PFC-CONTROL
D12
CN15 R79 X1 E14
1
R89
C49 R43
C72 1
T2B C55 IC14 Q5
C43
R106 R60 R24
R105 P E Q C67
D28 SW1 R98 C16
D27 R27
C20
CN28 R52
R104
C40
C77
R107
C79 R35 R37 R111
E13 1
C9 1 R54
R108
R117
IC9
R53
R118 C28
C23
R103
Q6 R112 C26
C21
R57
C30
R42
R22 R56 C60
R55 C78
C47 R30 IC11
D17
R41
R15 R65 C76
D6 R90 R46 R113
D9 R48
R9
CN12 C38 1
R50
C61
D1 R94
CN14
D20 E1
R4 Q7 R114 C32
CT1
E12 C37 R51
CompTop
C75
LOW/HIGH
R61 R115 1
IC16 R58
Q8
CONdebug1
C44
15 1 R72
R45
16 2 D2 R67
R75
C51
R63
L-OUT
C33
R44
C10
D3
RY1
RY2
RY3
CN29
D4
R7
PTC1
CN32
CN33 Q1
R8
N-OUT
CE-KFR80W/BP2T4N1(AC MOTOR)-310.JD.FW.WXWKB.WP1-1
C48
C3
C52 C5
C6
C7
L1 L2
CN1-CN2 (controled by RY1 relayer)
connect to the 4-WAY
when 4-way is ON, output 208-230VAC
CN19
NO USE
17122300001076 [1.4] 2015.08.27
B
A
FAN-C FAN-C`
AC MOTOR
N L
H
CN18
CN10 CN36 CN35 CN34 CN13
CN10
CN36
CN35
CN34
CN13
FAN-C
C64 CN11
C63
FAN-C`
NO USE
RY7
IC3
R12
R121
RY5
Q3
R100
C11
RY8
RY6
DSP1
C53
Q2
C58
FUSE1
R73 R76 R78 R80 R96
FUSE1
IC2 T5A 250VAC
R29 T5A 250VAC
C18
S-D
CN16
IC4 CN30 CN30
D31
R36 R25
S
Signal wire
connect to the terminal
1 D14
IC5 D10 24VDC Pulse wave betweene (+CN4)-(-CN30)
R40 C27
S-C
CN20
IC7
D32
1
IC8
R49
C34
S-B
CN23
IC10 R59 R47
D33
D18
D16
1
IC12
R64 C42
S-A
CN25
IC13
D34
S N L
CN1
C50
CN2 P-2(GND)
C80
connect to the Earth(Optional)
4-WAY
P-2
FOR EMC
GND
CN6
CN5
P1
N
connect to P2
HEAT1 C81
P1
CN9
CN3
CN8
P2
HEAT2
L-IN
FUSE2
T30AL/250VAC
RY4
ZR1
AS1
C2
P-1
GND
NO USE
CN3(L-IN)
CN4(N-IN)
CN4
power supply
C8
C4 ZR3 ZR2
208-230V AC
connect to the terminal
P-1(GND)
connect to the earth
CN6-CN5 (controled by RY3 relayer)
CN9-CN8 (controled by RY4 relayer)
connect to the heater
when heater is ON, output 208-230V AC
27
CN16
CN20
CN23
CN25
NO USE