Internal Communication Error Of The Outdoor Unit C-Box - Samsung AM080FX A Series Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)

4-3-6 Internal Communication error of the Outdoor Unit C-Box

Outdoor unit
display
Duct, Cassette (1/2 Way),Console, Celing
Operation
Indoorunit
display
×
※ ● : ON ◑ : Flash ×: OFF
Judgment
∙ Main PBA detecting uART communication other PBA. (Hub, Inverter, Fan)
Method
∙ Communication wire inside the C-Box is unconnected
Cause of
problem
∙ Main PBA defective
1. Cause of problem
Is the jumper
connector connected to CN31 of Inverter PBA2
(when the Comp. applied one :
Inverter PBA1)?
Is Inverter PBA1 CN32 and Inverter PBA2
CN31 connector accurately connected?
Is Inverter
PBA1 CN32 and Fan PBA CN12 connector
accurately connected?
Does FAN PBA LD22/LD32 (LED) blink?
Replace Main PBA
Samsung Electronics
- All boards of outdoor unit are not communicating
Defrost Timer Fan Filter/MPI Operation Defrost Timer Filter Operation
× ◑ ◑
Two Comp. applied to the model
Yes
Yes
Yes
Yes
Cassette (4/Mini4 Way)
× × ◑
No
No
No
No
Wall-mounted (NeoForte)
◑ × ×
Restart operation after connecting the Inverter
PBA2 CN31(when the Comp. applied one :
Inverter PBA1) connector. (Check the 3, 4 Pin short)
* Service after turn off the Main Power.
Restart operation after checking the Inverter
PBA2 CN31 and PBA2 CN32 Communication
wire/Connector.(3, 4 Pin Short)
* Service after turn off the Main Power.
1) Check the Inverter PBA1 CN32, CN91 and
Fan PBA CN12 Communication wire/
Connector.
2) Restart operation after connecting the Hub
PBA CN97 and Fan PBA CN13 connector.
* Service after turn off the Main Power.
1) Check the Main PBA : Main PBA TX circuit
inspection
2) Check the Hub PBA : Hub PBA TX circuit
inspection
* Service after turn off the Main Power.
Timer Turbo
◑ ◑
160