Symptoms And Parts To Inspect - Sanyo SPW-X253GH56 Service Manual

(5)

Symptoms and parts to inspect

1) Symptom: LCD on the remote controller does not display and remote controller does
not operate.
Miswiring of
power supply
wires and
indoor/outdoor
control lines
Correct the
wiring. Remove the
socket connected to
the OC plug on the
PCB and connect to
the EMG plug instead.
4
Correct the
connections
Replace the
indoor unit power
transformer.
No
Yes
Is there 220-240 V AC
between U1 and U2
of the 8P terminal
plate?
No
Check and repair the
power breaker etc.
No No
Are the connections
for the 4P connector
for the indoor unit's
PCB power trans-
former good?
Yes
Is there 15 V AC
No
between 1 and 2
of the 4P connector
for the indoor unit's
power transformer?
Yes
Replace the
indoor unit PCB.
Start
Is the LED (D80) on
Yes
the indoor unit PCB lit?
No
Is there 12 V DC
Is there 12 V DC
Yes
between R2 and R3
between 2 and 3
on the 8P terminal
of the remote
plate of the indoor unit? controller?
No
Is there 220-240 V AC
Replace the
between R and S of
remote controller.
the indoor PCB?
Yes
Has the indoor
unit PCB fuse blown?
Yes
No
Is the primary
Is the 220-240 V AC
side of the indoor
circuit shorted?
power transformer
shorted?
Yes
Replace the indoor unit's Replace or repair.
power transformer.
– 66 –
4. Service procedures
Repair the
No
remote
controller
wiring.
Yes
No
Replace the
indoor unit PCB.
Yes
0332_M_I
SM830033