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Trouble shooting 77
Error Contents :
Communication Error
with VRF system
Details :
Condition of occurrence : The communication between VRF system and Network Convertor was not performed normally.
When indefinite signal is input from VRF system.
Release condition : When the communication with VRF system is resumed normally.
Cause 1 : External noise
p Check continuation of error.
(1) If error is released automatically, it is not a defect of PCB. Remove the surrounding noise source around Network Convertor.
(2) If error is not released automatically, check followings.
OK
pAfter pressing SW104 of Network Convertor PCB for 5 seconds or turning on power.
Does error code display reappear?
YES
Remove the surrounding noise source.
OK
p After resetting the VRF system power, proceed as follows.
(1) If error did not appear, it is not a defect of PCB. Remove the surrounding noise source around the VRF system.
(2) If error occurs again, check followings other than removing surrounding noise source.
OK
Cause 2 : Network Convertor is defective.
Replace Network Convertor.
OK
Cause 3 : Defective PCB of VRF system
Replace VRF system PCB.
Symptom :
Error Code display [ 1F ] Control/Display from VRF system is
not available. Other controls are left as they are.
NO
It is not a defect of PCB. Remove the surrounding noise source.
06-77
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Table of Contents
Troubleshooting
