5
Service diagnosis
Domestic air conditioner
YES
Check the indoor PCB.
NO
YES
Measure the voltage between
Jumpers 3 and 4 of IC1 on the indoor
PCB with a multimeter
The outdoor PCB is damaged;
Replace them with a new one.
Measure the AC voltage between
positions 1 and 3 on the terminal of
outdoor unit with a multimeter.
If 230VAC is available but
310DC not, the power
module is damaged,
replace it with a new one
.
Test the outdoor power supply (230VAC
and +310VDC) with a multimeter.
The outdoor PCB is damaged;
replace it with a new one.
The indoor PCB is damaged;
replace it with a new one
.
If the value varies between 0 and 80
VAC, the outdoor PCB is damaged,
replace it with a new one.
If the value is constant at about 30V,
the indoor PCB is damaged, replace
it with a new one.
NO
Whether voltage is of a
constant value of 0V DC to
5V DC
If both 230VAC and
310DC are available, measure
+12V(from7805) is available
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