Connections On Pcb - Sanyo MDF-C2156VAN Service Manual

Connections on PCB

* Following are explanation of connections on the Main PCB.
Connector
CN1 Switching power supply
CN2 LCD module
CN3 Control Board (CN5)
#1-#2: Battery switch
CN4
#3-#4: Transformer(100V, 9V)
CN5 Main PCB (CN3)
CN6 Main PCB (CN18)
CN7 MTR-480 (Option)
CN8 #1-#2: Buzzer PCB
#1-#2: Temp. control relay H
CN9 #3-#4: Temp. control relay L
#5-#6: Heater relay
CN10 #3-#4: Door switch
Remote alarm terminal
CN11
Remote switch
#1-#2: AT sensor
#3-#4: Filter sensor
CN12
#5-#6: Cascade sensor
#9-#10: Door switch
CN13 Unused
CN14 LCD module
CN15 Main PCB (CN8)
CN16 Unused
#1-#2: Switching power supply
CN17
#3-#4: Lock
CN18 Control board (CN6)
CN19 #3-#4: Back up PCB
CN20 #1-#3: Temp. sensor
CN21 #3-#4: Analog terminal
Connects to Usage
To supply the power to PCB.
To connect with LCD.
To connect with LCD contrast adjusting
knob.
To supply the power to Main PCB
during power failure.
To detect abnormal low voltage.
To connect with interface.
To connect with buzzer.
To control compressor H.
To control internal temperature.
To supply the power to cap. tube heater.
To control digital lock (Option).
To output remote alarm
To detect ambient temperature.
To detect temperature at condenser
outlet pipe.
To detect temperature at cascade.
To control door switch.
To supply the power to back lamp for
LCD.
To supply the power to digital lock.
To connect with each keys.
To connect with back-up system.
To detect internal temperature.
To output analog.
20
Voltage
#1: 12V
#1-#2: 24V
#1: 5V
#1: 12V
#2: 5V
#1: COM
#2: N.C.
#3: N.O.
#1: 24V
#3: 24V