Samsung AC035JNMCEH Service Manual page 51

System air conditioner
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4-6 PCB Inspection Method
4-6-1 Pre-inspection Notices
1. Turn off the breaker, AC power source, before disassembling the unit because of electrical hazard.
2. Confirm the complete discharge of capacitor C102, C702, C703, C704, C705, C706, C707 on the INVERTER PCB when you touch the
PCB.Especially dischargeing speed of C702-C707 is very slow because of little load in stand-by condition. To confirm the voltae of
C702-C707, measure the DC link voltage at the IGBT module pins near C701 at which applying voltage(450-510Vdc) is marked.
To confirm discharging of C102, measure the voltage of non mounted C103 solder hole or check if all LEDs are off.
3. Don't touch the metal body of electrolytic capacitor for avoiding electrical shock before confirming discharge.
4. To discharging the capacitor use power resistor of about 1 Kohm 10W. Soldering tool(non electronic temperature control type) can
be used as a discharging resistor.
5. Don't pull the lead wire but hold the whole housing to disconnect or connect a housing from or to the PCB.
4-6-2 Inspection Procedure
1. Check the connection of each housing to the connector first and the peeling of PCB copper pattern.
2. The PCB is composed of the 3 part in the indoor unit.
● INDOOR Main PCB part : Indoor unit control, MICOM and surrounding circuit, relay, fan motor driving circuit,
1.
● Display PCB part : LED lamps, Switch,Remocon module.
1.
● INDOOR EMI PCB part : Line filter, Noise Capacitor and Varistor
1.
3. The PCB is composed of the 3 part in the outdoor unit.
● EMI PCB part : Line filter for electrical noise, Varistors for surge and Fuses.
1.
● MAIN PCB part : Refrigeration cycle controller with MICOM
1.
● INVERTER PCB part : Compressor driving inverter and BLDC fan controller
1.
Samsung Electronics
sensor reading circuit, buzzer driving circuit and DC power supplying circuit.
4-25

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