Sharp AE-X12PSR, Service Manual

Page: 41 / 73

SHARP(CHINA)INVESTMENT CO.,LTD
5. Display EC
Problem symptom Display EC
Cause Outdoor communication fault between power source board and
intelligent power module
Malfunction No. Content of diagnosis Action
1 Check the contact of communication wire (CN5)
between power source board and intelligent power
module
Insert again if loose.
The indicator on power
source board flare normal
(bright for 1 second and dark
for 1 second), but the
indicator on intelligent power
module does not work
normally
Replace the intelligent power
module
If the fault remains unsolved,
replace the power source board
again.
2 After the complete
unit is energized,
check the indicators
on outdoor power
source board and
intelligent power
module
The indicator on intelligent
power module flare normal
(bright for 1 second and dark
for 1 second), but the
indicator on power source
board does not work normally
Replace the power source
board
If the fault remains unsolved,
replace the intelligent power
module again.
You can check each voltage of the electrical board communication pin, the normal data is as the following:
Pin 1 2 3 4 5 6
Voltage(V)
5 1.0-4.8 1.8-4.1 2.6 earthing 15
Outdoor communication circuit
3-13