Sanyo UH2442 / CH2442, XH3642 / CH3642 Service procedures Symptoms and parts to inspect

4. Service procedures

(5)Symptoms and parts to inspect

1)Symptom: LCD on the remote controller does not display and remote controller does not

operate.

Miswiring of	Yes	Is there 230-208 V AC
power supply		between U1 and U2
wires and		of the terminal plate?
indoor/outdoor			No
control lines

Correct the	Check and repair the
wiring. Remove the	power breaker etc.
socket connected to
the OC plug on the
PCB and connect to
the EMG plug instead.

Start

Is the LED (D80) on		Yes
the indoor unit PCB lit?
	No

No Is there 230-208 V AC between R and S of

the indoor PCB?

Yes

Repair the remote controller wiring.

Correct the

No

Are the connections

No

Has the indoor

connections

for the 4P connector

unit PCB fuse blown?

for the indoor unit’s

Yes

PCB power trans-

former good?

Yes

No

No

Replace the

No

Is there 15 V AC

Is the primary

Is the 230-208 V AC

Replace the

indoor unit power

between 1 and 2

side of the indoor

circuit shorted?

indoor unit PCB.

transformer.

of the 4P connector

power transformer

Yes

for the indoor unit’s

shorted?

power transformer?

Yes

Yes

Replace the

Replace the indoor unit’s

Replace or repair.

indoor unit PCB.

power transformer.

2095_THS_I

SM830082

4

IV - 9