Fujitsu AB*A12, Service Manual

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Trouble shooting 45
OUTDOOR UNIT Error Method:
Network Communication Error
(Only for Main Unit)
Indicate or Display:
Outdoor Unit : LED1 Flash, LED5
9 Times Blink
Indoor Unit : Operation LED Flash , Timer LED 3 Times Blink
Swing LED 3 Times Blink
ERROR CODE : E : 32
Detective Actuators:
Outdoor Unit Controller PCB circuit
Detective details:
When the network signal from the indoor unit that has a receipt record was not
received longer than 5 minutes. (Indoor Unit does not display Error)
Or, when the network signals from all the Indoor Units were not received for
more than 5 minutes.
Check Point 2 : Check outside cause (Voltage drop or Noise)
p
Instant voltage drop ------ Check if there is any electric equipment with a large load within the same circuit.
p
Momentary power failure ----- Check contact failure or leak current in power supply circuit
>> Check Indoor Unit as well.
p
Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave). And check the complete insulation of grounding.
>> If the same symptom does not reappear after resetting the power, possibility of noise is high.
Check Point 1 : Check connections
Turn off the power and check/correct followings
p
Isn’t Outdoor Unit Transmission PCB connection loose?
p
Check loose or removed communication line between Indoor Unit
and Outdoor Unit.
p
Make sure Controller PCB for Main Unit has Terminator (CN22).
Check Point 3 : Check Transmission PCB and Controller PCB
p
When a signal from some Indoor Unit could not be received, check the connection of its Indoor Unit’s Transmission
PCB. (Refer to Trouble Shooting 12)
>> If the symptom does not change, replace Indoor Unit Transmission PCB. (If it still does not improve, replace
Controller PCB.
p
When the signal from all the Indoor Units could not be received, replace Outdoor Unit Transmission PCB.
>> If the symptom does not change, replace Outdoor Unit Controller PCB.
Outdoor Unit Schematic (CN22:TERMINATOR)
Note : Terminator
Terminator is a resistance that prevents the
reflection of the signal at the end terminal of
the circuit which causes abnormal data
transmission when connecting multiple
devices with 1 piece of cable.
OK
OK
Forecast of Cause : 1. Connection failure 2. Outside cause 3. Transmission PCB failure 4. Controller PCB failure
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