10 Troubleshooting
Checking procedure for main parts
SMGB0091 rev.2 - 11/2015
274
Checking capacitors CB1 and CB2
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D A N G E R
Electrical hazard. Risk of serious injuries or death.
• Before installing the electrical wiring or before performing a periodical check, turn OFF the main switch of the unit. For safety
reasons, be sure that the fan is stopped.
• Prevent from touching the capacitors’ terminals. High voltage should be present before discharging them.
• Turn off the unit and wait for the LED 201 to be off before touching the components.
If it’s possible, check the capacitance of each capacitor : 4700μF ± 20% (between 3760μF to 5640μF).
A visual check of the pressure valve of capacitors must
be done to ensure it’s integrity
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N O T E
It is not recommended to check tension.
PN = Power source x √2, PC=CN is nearly equal to PN/2.
Checking R1 and R2
1
If the value is different:
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Capacitor could be damaged by overload.
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04/06 alarm could be displayed if low supply voltage is present.
2
R1 = 6.3 kΩ & R2 = 10.5 kΩ. If these values are different, the capacitors are not properly charged.
Checking RS1 and RS2 between (A) and (B) = 250 Ω (white resistances)
In case that Mg. SW 52C (CMC) is not ON, the compressor current will travel through these resistances, and they will
be broken. Mg. SW 52C (CMC) should be checked. Check the resistance between the primary and secondary terminal
where the contact point is melted for Mg. SW 52C. If there is continuity, the contact is melted and 52C is broken.
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N O T E
•
Noise filter does not affect inverter PCB directly, so is not necessary to check it when inverter PCB fails.
• Both digital or analog testers are valid to check the values.